New Circuits Page 116
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With the recent events at the Fukushima Dai-ichi nuclear power plant, I thought it would be pretty cool to build a Geiger Counter and hook it up to my NerdKit for interfacing with my computer. I`ve found this article which explains the building process....
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The idea for this circuit came when the author had problems with the wireless speedometer on his bicycle. Such a device consists of two parts: the cycle computer itself and a transmitter that is mounted on the front fork. A small magnet is attached to the....
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This circuit demands a control current that is 100 times smaller than that needed by a typical optically isolated solid state relays. It is ideal for battery-powered systems. Using a combination of a high current TRIAC and a very sensitive low current SCR,....
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The motor controller is a custom built box that is a combination of custom printed circuit boards, the Pico Systems Universal Stepper Controller card, gecko G320 motor drives and internal power supply. The motor controller also links to the servos which....
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Implementation of CAN for use in aircraft. The protocol is called CAN-FIX and is a part of the MakerPlane Open Source Airplane project. You can get more information on CAN-FIX here. The idea for this project is to build an Arduino shield that will let it....
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JFET-bipolar cascode circuit will provide full video output to drive the CRT cathode. The advantage is about 90. Cascode configuration eliminates problems with JFET 2N4091 Miller capacitance, thus allowing the drive directly from the video detector. JFET,....
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An external EEPROM can be useful for several different reasons. External EEPROMs allow much more data to be stored than is available on the 18F4520. In addition, EEPROM memory saves state when power is removed. In this project, we interfaced to a Microchip....
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Tape isolate single-phase PFC that DC/ DC vary make up, make up two cable, PFC of three-phase, that single-phase PFC make up in parallel directly in Ausgang by three single-phase PFC in parallel respectively by three The road is formed by matrix type DC/ DC....
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This simple stereo encoder circuit schematic is build with 2 IC MMC4066E and MMC4047 and one transistor BC547B. On IC1 2 and 3 pins is the audio output whi....
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This page serves as documentation for the circuits that I have built which make use of the Modular Signal System first documented by Gregg Fuhriman in Railmodel Journal, and further documented on the Free-mo. org website. This effort was an experiment on my....
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CW operation up to 350mA from 2. 8. 6V supply voltage TTL modulation frequency up to 10KHz, with adjustable duty cycle. Rapid soft start after power-on. Simple power adjustment via the external resistor...
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Building an LC meter for a while since I do not have a multimeter that is capable of measuring inductance and while the multimeters I have can measure capacitance, they are not able to give accurate readings for small capacitance in the range of several....
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Here is a simple engineering project circuit of handy mobile cell phone detector (sniffer). This pocket-sizedmobile communication detector or sniffer can sense the existence of a mobile device. So it can be used to avoid the use of mobile phones in private....
-
This simple circuit mixes two or more channels into one channel (eg. stereo into mono). The circuit can mix as many or as few channels as you like and consumes very little power. The mixer is shown with two inputs, but you can add as many as you want by just....
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This low-cost logarithmic converter is built using op-amp and transistor. This circuit uses a Motorola MC1539G op-amp which is connected to PNP transistor. To....
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This circuit was designed to allow a laptop computer to be powered from a solar power setup. The computer requires 12V at 3.3A. The circuit is a linear re....
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The ultrasonic drilling machine circuit is composed of power supply circuit, ultrasonic oscillator circuit, preamplifier, promoting amplifier circuit and power amplifier output circuit, and the circuit is shown as the chart. Ultrasonic oscillator circuit....
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It is a very useful thing , to have a small headphone amplifier , capable of driving a couple of pairs phones. Fortunately, the headphone amp has a much easier job to do, in that neither the output power requirements nor the load characteristics are so....
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The schematic for a monostable multivibrator is shown below. Like the astable multivibrator, one transistor conducts and the other cuts off when the circuit is energized. Recall that when the astable multivibrator was first energized, it was impossible to....
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In normal suburban driving you pass through so many different speed zones that it can be a nuisance having to switch speed settings. The speed display can also be a distraction. This circuit eliminates the display and the need for speed selection. Each time....
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Cooling an instrument or a device can improve the SNR (signal-to-noise ratio), and it can also prolong product life. For example, the dark-and-noise signal of an infrared detector`s output at room temperature can be an order of magnitude smaller when cooled.....
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This circuit uses an LM11 to form a voltage follower with 1G ohm input resistance built using standard resistor values. With the input disconnected, the input offset voltage is multiplied by the same factor as R2; but the added error is small because the....
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H66T32BA is a sub package of H66T19, If you need see the description, please click H66T19. If you need H66T32BA`s datasheet, please download it from below. By Micro Electronics Ltd. ..
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Capacitive touch sensors are based on the electrical capacitance of the human body. When, for example, a finger comes close to the sensor, it creates a capacitance to Earth with a value of 30 to 100 pF. This effect can be used for proximity detection and....
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A very usefull talk over circuit which you can use in your radio stations, club or anywhere you want to speak over music without any movement of potentiome....
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Remote Control Mains Switch As the only electronics engineer in my family and circle of friends, it is sometimes not possible to evade an appeal for help ..
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This circuit project automatically turns on a night lamp when bedroom light is switched off. The lamp remains ON until the light sensor senses daylight in....
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The AAT1275 evaluation board provides a platform for test and evaluation of the AAT1275 switching boost converter with USB Power Switch The evaluation board demonstrates suggested size and placement of external components to achieve 5V output voltages and up....
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The circuit consists of three parts. The first part has an oscillator while the second has mod 16 counter 7493. The oscillator is wired in self-triggered mode, and the potentiometer VR1 is used for speed control of the running lights. That is, frequency can....
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The circuit described here counts the number of times that an infrared beam is interrupted. It could be used to count the number of people entering a room, for instance, or how often a ball or another object passes through an opening (handy for playing....
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You can`t expect great performance from such a simple detector-based meter. Sensitivity is just adequate enough to get a basic idea of the power that your transmitter is capable of....
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Many times, I have written code for UART communication and when it came to testing, my laptop does not have a serial port. I bought a USB to serial port converter but it didnt worked. I felt frustated and finally thought of buying a Serial to Com port module....
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Pulse motor or stepper motor step motors, foreign, or commonly known as Step motor Stepping motor, Stepper, and so on. To the conventional stepper motor, the stepper motor can be simply defined as, according to the input pulse signal, each time changing the....
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Since portable PCs are today common and a USB linkis a better solution here we present an oscilloscope using USB port of the PC that operates at upto 10 kHz with ±16V input voltage. Ithas much more improved features thanthe PC-based oscilloscope.The....
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Used in recording signals from active sonar on magnetic tape, for later playback to control land-based sonar used in training operators. Modulator is basically sawtooth generator whose repetition frequency is changed by amplitude of modulating input signal.....
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Electronics-DIY has instructions on how to build a simple portable FM transmitter that would allow your iPod to broadcast music over radio waves. It is simple to build and fits into a mouse case. It works quite easy, there is a power switch on the bottom to....
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One of the motors always seem to hesitate and be on or off randomly. Also the motors are just very unpredictable in general (with this setup that is). When I use them independently they work fine without any hesitation or anything. Regarding your GPS unit,....
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Switching regulator subsystems intended for use as dc to dc converters. 3V to 40 Volt DC Converter circuit | The use of switching regulators is becoming more pronouncedover that of linear regulators because the size reductions innew equipment designs require....
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A new type of remote control based on ultra sonic sound. The transmitter part of the circuit is build around IC1(NE 555). The IC1 is wired as an astable multi vibrator operating at 40KHz. The output of IC1 is amplifier the complementary pair of transistors (....
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This is a simple magnetic levitation circuit which suspends objects a set distance below an electromagnet. The physics behind it is to simply provide a mag....
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The metal detector circuit consists of oscillator and sound-light alarm circuit, and the circuit is shown as the chart. Oscillator circuit consists of inductor L, capacitor C1, sensor switch integrated circuit IC1 (includes oscillator, detector and....
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The Adjustable Timer circuit starts timing when switched on. The green LED lights to show that timing is in progress. When the time period is over the green LED turns off, the red LED turns on and the bleeper sounds. The time period is set....
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This circuit features an intermittent siren output and automatic reset. It can be operated manually using a key-switch or a hidden switch; but it can also be wired to set itself automatically when you turn-off the ignition. By adding external relays you can....
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DC Motor Control Using A Single Switch this simple circuit lets you run a DC motor in clockwise or anti-clockwise direction and stop it using a single switch, pdf file DC motor reversing circuit DC motor reversing circuit, A DC motor reversing circuit using....
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This circuit takes standard 0-10V control voltage (for example from analogue light controlling desk ) and outputs a standard 1-2 ms RC servo motors control pulse. Component How many 100 kohm resistor 2 47 kohm resistor 1 33 kohm resistor 1 470 ohm trimmer 1....
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The AGC is used in many system especially communications. This AGC? works at 50Mhz, and the output voltage is set by a digital signal that is needed by...
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The mini condenser microphone converts sounds into an electrical signal. Resistor R1 provides bias for the condensor microphone`s internal amplifier transistor. The 2N3906 PNP transistor acts as a low noise microphone input amplifier. The 10K gain....
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I have also realised that my intentions for night air charging are possible, but unnecessary. When heating is going on (late March/early April) the boxes worked at night because air temp was better than glycol temp - that was helpful. Now that it is summer....
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The Passive Aircraft Receiver is basically an amplified "crystal radio" designed to receive nearby AM aircraft transmissions. The "passive" design uses no oscillators or other RF circuitry capable of interfering with aircraft communications so it should be....
-
-
With the wide application of SMT technology in products such as the computer, network communication, consuming electron and car electron, etc. , the assembly of the electronic product prones to complicating, high precision, melting and multi-functional....
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-
Here I have described how to connect a 16 by 2 LCD display to a microcontroller. Here I have demostrated it with very common pic 16F877A. This is the circuit diagram. Here I haven`t showed the power supply and oscillator connection for pic and LCD. LCD....
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infrared remote controlled switch is second remote controlled project in this website using 555 ic circuit diagram with description of remote controlled switch...
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Circuit PT2399 digital Echo Circuit schematics Circuit Electronics, Digital Echo Processor IC PT2399 is using CMOS technology in audio purposes. digital Echo Processor PT2399 is implementing the system in the process of ADC and DAC audio r....
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An electric fence, perimeter protection circuit, designed to run on batteries, and provide configurable pulses of up to 20KV, to protect a tent perimeter against bears or other animals, out in the wild. The device uses two 555 timer circuits to generated a....
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DX TV enthusiasts often have to deal with relatively crowded VHF bands. In these instances, reduced TV receiver bandwidth results in greater selectivity. The other advantage of bandwidth reduction is improved signal to noise ratio. This results in less noise....
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The ADV7390/ADV7391/ADV7392/ADV7393 are a family of high speed, digital-to-analog video encoders on single monolithic chips. Three 2.7 V/3.3 V 10-bit video DACs provide support for composite (CVBS), S-Video (YC), or component (YPrPb/RGB) analog outputs in....
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This simple circuit is build around a CMOS IC 4060 to obtain the required timing. During day time the LDR has low resistance and keeps the pin 12 of the IC1 high, preventing the IC1 from oscillating. When it is dark the LDR resistance becomes high and the....
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Communication with the MCP3028 ADC chip is done using a simple serial interface compatible with the SPI protocol. The Pic16f84 or Pic16f628 didn`t had hardware SPI peripheral. However, software implemeted SPI protocol can be done to communicate with 12 bit....
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This power supply electronic circuit is a high current 5 volts power supply circuit that use a 7805 voltage regulator and some classic electronic components. T1 acts as a current limiter. Once the voltage on R2 + R3 is greater than 0. 6 0. 7 V, the....
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This is a simple hardware computer interface and Linux program which can be used to control the most commonly used buttons on any consumer Family Radio Service (FRS) or General Mobile Radio Service (GMRS) radio. There are 22 available FRS/GMRS frequencies in....
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I`ve been putting in a lot of extra hours at work the last week in anticipation of an editing deadline. Despite this, I thought it was about time that I attempt a little hardware hacking. Even before computers, I was facinated by electronics. I read book....
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For C3, the 100pF across R2. The circuit does exactly the same thing, once again with no explanation. Apparently the utility ought to be obvious, but I`m new to earnest analog electronics. I can only assume that it`s stabilizing something, but I don`tknow....
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Two diodes in feedback path or LM324 opamp create musical-instrument effect known as fuzz by limiting output voltage swing to ±0. 7 V. Resultant square wave contains chiefly odd harmonics, resembling sounds of clarinet. Fuzz depth pot controls level at which....
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This phone is loud ringing tone circuit for generating the electricity bell in the old telephone. This circuit is relatively loud. so can use to replacement the same ringer or the original telephone may be lost. We do not need a new phone. The detect ringing....
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This project creates a RGB LED lit love heart which is controlled by a PIC12F683 microcontroller. I designed the project as a gift for my wife on our 15th wedding anniversary (since she puts up with my addiction to electronics I thought she deserved....
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The project described in this article is a constant Q, fully expandable graphic equaliser. Where most conventional graphic EQ circuits have a Q that is dependent on the setting of the pot, this one maintains the same Q at all settings. This is achieved by....
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In contrast to traditional small-signal approaches, the use of large-signal, time-domain design techniques helps deliver low-noise grounded-base oscillators for VHF/UHF applications....
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A common piezoelectric alarm, such as the Murata (Smyrna, GA) PKB5-3A shown, has many valuable attributes. It is compact, lightweight, efficient and reliable. However, the loud, high-pitched sound output can be quite irritating in many applications. The....
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If your letterbox is some distance from your house, you will find a monitoring device useful to indicate when new post has arrived. This can take the form of a US-style visible flag; a more modern alternative uses a 433 MHz radio transceiver. The big....
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As I often drive on motorways, I always and frequently use the direction indicators in order to show the lane change. I normally did this by holding a ....
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The bi-directional sequencer uses a 4 bit binary up/down counter (CD4516) and two "1 of 8 line decoders" (74HC138 or 74HCT138) to generate the popular "Night Rider" display. A Schmitt Trigger oscillator provides the clock signal for the counter and the rate....
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In normal suburban driving you pass through so many different speed zones that it can be a nuisance having to switch speed settings. The speed display can....
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I have received a number of emails requesting schematics for infa-red remotes. So here is one. This remote transmits a tone using an infa-red LED. This tone is decoded by the receiver. Since the receiver only switches when it "hears" the tone, there are no....
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The diagram shows a set of cell diode capacitor connected in series, each set of increasing voltage 300 V. This Supply generates DC high voltage 40kV, with which you can make interesting experiments. With the available 40 kV capacitors, 160 kV output voltage....
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Using the latest generation of trench and polar power MOSFET technologies, we have developed both trench and polar P-Channel power MOSFETs that retain all the features of comparable N-Channel power MOSFETs such as very fast switching, voltage control, ease....
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Presented here is a Long Range FM Transmitter. This circuit is a super-sensitive, mini-powered FM transmitter consisting of a RF (radio Frequency) oscillator section interfaced with a high sensitivity, wide pass-band audio amplifier and capacitance mike with....
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The Haynes manuals is extremely confusing regarding the labeling of the relays on Spitfires. The two ways they confuse readers is 1. the illustrations show right hand drive cars with different locations for relays, and 2. the naming of the relays is strange....
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The circuit M8031 has a built-in RC oscillator and digital envelope circuits that make it to require few external components. The sound generated by the M8031 simulate an mechanical ding-dong sound. The M8031 operates from a low input voltage from 1. 3 to 3.....
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This simple circuit uses a 741 op-amp in differential mode as a continuity tester. The voltage difference between the non-inverting and inverting inputs is amplified by the full open loop gain of the op-amp. Ignore the 470k and the 10k control for the....
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In case the robot being on the black line, it will always go ahead, and in the case of out of line and fall into a white area, it will determine whether to correct to the left or right, and thus remain on the black line. The sensors that will be used is the....
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This is a simplified version of the Universal Keypad-Operated Switch. I have modified the design to reduce the complexity of the circuit - and the number of components required. As a result - the code is somewhat less secure. However, there should be lots of....
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The heart of this DIY metal detector circuit is CS209A. The metal detector is build with one 100 µH coil. CS209A has one oscillator which forms a LC circuit, the inductance of the coil will change when it is near metal objects. LED 1 will light and the....
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Short circuits or broken pcb tracks can be easily recognized by means of a Multimeter, but this tool can give wrong results when testing the efficiency of a transistor or diode, unless the device under test is unsoldered and removed from the pcb. A further....
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This is a monostable multivibrator circuit that employs a single op amp. The main component of this circuit is the 741, a general-purpose operational amplifier. A monostable multivibrator is a timing circuit that changes state once triggered, but returns to....
With the recent events at the Fukushima Dai-ichi nuclear power plant, I thought it would be pretty cool to build a Geiger Counter and hook it up to my NerdKit for interfacing with my computer. I`ve found this article which explains the building process....
The idea for this circuit came when the author had problems with the wireless speedometer on his bicycle. Such a device consists of two parts: the cycle computer itself and a transmitter that is mounted on the front fork. A small magnet is attached to the....
This circuit demands a control current that is 100 times smaller than that needed by a typical optically isolated solid state relays. It is ideal for battery-powered systems. Using a combination of a high current TRIAC and a very sensitive low current SCR,....
The motor controller is a custom built box that is a combination of custom printed circuit boards, the Pico Systems Universal Stepper Controller card, gecko G320 motor drives and internal power supply. The motor controller also links to the servos which....
Implementation of CAN for use in aircraft. The protocol is called CAN-FIX and is a part of the MakerPlane Open Source Airplane project. You can get more information on CAN-FIX here. The idea for this project is to build an Arduino shield that will let it....
JFET-bipolar cascode circuit will provide full video output to drive the CRT cathode. The advantage is about 90. Cascode configuration eliminates problems with JFET 2N4091 Miller capacitance, thus allowing the drive directly from the video detector. JFET,....
An external EEPROM can be useful for several different reasons. External EEPROMs allow much more data to be stored than is available on the 18F4520. In addition, EEPROM memory saves state when power is removed. In this project, we interfaced to a Microchip....
Tape isolate single-phase PFC that DC/ DC vary make up, make up two cable, PFC of three-phase, that single-phase PFC make up in parallel directly in Ausgang by three single-phase PFC in parallel respectively by three The road is formed by matrix type DC/ DC....
This simple stereo encoder circuit schematic is build with 2 IC MMC4066E and MMC4047 and one transistor BC547B. On IC1 2 and 3 pins is the audio output whi....
This page serves as documentation for the circuits that I have built which make use of the Modular Signal System first documented by Gregg Fuhriman in Railmodel Journal, and further documented on the Free-mo. org website. This effort was an experiment on my....
CW operation up to 350mA from 2. 8. 6V supply voltage TTL modulation frequency up to 10KHz, with adjustable duty cycle. Rapid soft start after power-on. Simple power adjustment via the external resistor...
Building an LC meter for a while since I do not have a multimeter that is capable of measuring inductance and while the multimeters I have can measure capacitance, they are not able to give accurate readings for small capacitance in the range of several.....png "Mobile cell phone detector (sniffer) circuit diagram: engineering and diploma project")
Here is a simple engineering project circuit of handy mobile cell phone detector (sniffer). This pocket-sizedmobile communication detector or sniffer can sense the existence of a mobile device. So it can be used to avoid the use of mobile phones in private....
This simple circuit mixes two or more channels into one channel (eg. stereo into mono). The circuit can mix as many or as few channels as you like and consumes very little power. The mixer is shown with two inputs, but you can add as many as you want by just....
This low-cost logarithmic converter is built using op-amp and transistor. This circuit uses a Motorola MC1539G op-amp which is connected to PNP transistor. To....
This circuit was designed to allow a laptop computer to be powered from a solar power setup. The computer requires 12V at 3.3A. The circuit is a linear re....
The ultrasonic drilling machine circuit is composed of power supply circuit, ultrasonic oscillator circuit, preamplifier, promoting amplifier circuit and power amplifier output circuit, and the circuit is shown as the chart. Ultrasonic oscillator circuit....
It is a very useful thing , to have a small headphone amplifier , capable of driving a couple of pairs phones. Fortunately, the headphone amp has a much easier job to do, in that neither the output power requirements nor the load characteristics are so....
The schematic for a monostable multivibrator is shown below. Like the astable multivibrator, one transistor conducts and the other cuts off when the circuit is energized. Recall that when the astable multivibrator was first energized, it was impossible to....
In normal suburban driving you pass through so many different speed zones that it can be a nuisance having to switch speed settings. The speed display can also be a distraction. This circuit eliminates the display and the need for speed selection. Each time....
Cooling an instrument or a device can improve the SNR (signal-to-noise ratio), and it can also prolong product life. For example, the dark-and-noise signal of an infrared detector`s output at room temperature can be an order of magnitude smaller when cooled.....
This circuit uses an LM11 to form a voltage follower with 1G ohm input resistance built using standard resistor values. With the input disconnected, the input offset voltage is multiplied by the same factor as R2; but the added error is small because the....
H66T32BA is a sub package of H66T19, If you need see the description, please click H66T19. If you need H66T32BA`s datasheet, please download it from below. By Micro Electronics Ltd. ..
Capacitive touch sensors are based on the electrical capacitance of the human body. When, for example, a finger comes close to the sensor, it creates a capacitance to Earth with a value of 30 to 100 pF. This effect can be used for proximity detection and....
A very usefull talk over circuit which you can use in your radio stations, club or anywhere you want to speak over music without any movement of potentiome....
Remote Control Mains Switch As the only electronics engineer in my family and circle of friends, it is sometimes not possible to evade an appeal for help ..
This circuit project automatically turns on a night lamp when bedroom light is switched off. The lamp remains ON until the light sensor senses daylight in....
The AAT1275 evaluation board provides a platform for test and evaluation of the AAT1275 switching boost converter with USB Power Switch The evaluation board demonstrates suggested size and placement of external components to achieve 5V output voltages and up....
The circuit consists of three parts. The first part has an oscillator while the second has mod 16 counter 7493. The oscillator is wired in self-triggered mode, and the potentiometer VR1 is used for speed control of the running lights. That is, frequency can....
The circuit described here counts the number of times that an infrared beam is interrupted. It could be used to count the number of people entering a room, for instance, or how often a ball or another object passes through an opening (handy for playing....
You can`t expect great performance from such a simple detector-based meter. Sensitivity is just adequate enough to get a basic idea of the power that your transmitter is capable of....
Many times, I have written code for UART communication and when it came to testing, my laptop does not have a serial port. I bought a USB to serial port converter but it didnt worked. I felt frustated and finally thought of buying a Serial to Com port module....
Pulse motor or stepper motor step motors, foreign, or commonly known as Step motor Stepping motor, Stepper, and so on. To the conventional stepper motor, the stepper motor can be simply defined as, according to the input pulse signal, each time changing the....
Since portable PCs are today common and a USB linkis a better solution here we present an oscilloscope using USB port of the PC that operates at upto 10 kHz with ±16V input voltage. Ithas much more improved features thanthe PC-based oscilloscope.The....
Used in recording signals from active sonar on magnetic tape, for later playback to control land-based sonar used in training operators. Modulator is basically sawtooth generator whose repetition frequency is changed by amplitude of modulating input signal.....
Electronics-DIY has instructions on how to build a simple portable FM transmitter that would allow your iPod to broadcast music over radio waves. It is simple to build and fits into a mouse case. It works quite easy, there is a power switch on the bottom to....
One of the motors always seem to hesitate and be on or off randomly. Also the motors are just very unpredictable in general (with this setup that is). When I use them independently they work fine without any hesitation or anything. Regarding your GPS unit,....
Switching regulator subsystems intended for use as dc to dc converters. 3V to 40 Volt DC Converter circuit | The use of switching regulators is becoming more pronouncedover that of linear regulators because the size reductions innew equipment designs require....
A new type of remote control based on ultra sonic sound. The transmitter part of the circuit is build around IC1(NE 555). The IC1 is wired as an astable multi vibrator operating at 40KHz. The output of IC1 is amplifier the complementary pair of transistors (....
This is a simple magnetic levitation circuit which suspends objects a set distance below an electromagnet. The physics behind it is to simply provide a mag....
The metal detector circuit consists of oscillator and sound-light alarm circuit, and the circuit is shown as the chart. Oscillator circuit consists of inductor L, capacitor C1, sensor switch integrated circuit IC1 (includes oscillator, detector and....
The Adjustable Timer circuit starts timing when switched on. The green LED lights to show that timing is in progress. When the time period is over the green LED turns off, the red LED turns on and the bleeper sounds. The time period is set....
This circuit features an intermittent siren output and automatic reset. It can be operated manually using a key-switch or a hidden switch; but it can also be wired to set itself automatically when you turn-off the ignition. By adding external relays you can....
DC Motor Control Using A Single Switch this simple circuit lets you run a DC motor in clockwise or anti-clockwise direction and stop it using a single switch, pdf file DC motor reversing circuit DC motor reversing circuit, A DC motor reversing circuit using....
This circuit takes standard 0-10V control voltage (for example from analogue light controlling desk ) and outputs a standard 1-2 ms RC servo motors control pulse. Component How many 100 kohm resistor 2 47 kohm resistor 1 33 kohm resistor 1 470 ohm trimmer 1....
The AGC is used in many system especially communications. This AGC? works at 50Mhz, and the output voltage is set by a digital signal that is needed by...
The mini condenser microphone converts sounds into an electrical signal. Resistor R1 provides bias for the condensor microphone`s internal amplifier transistor. The 2N3906 PNP transistor acts as a low noise microphone input amplifier. The 10K gain....
I have also realised that my intentions for night air charging are possible, but unnecessary. When heating is going on (late March/early April) the boxes worked at night because air temp was better than glycol temp - that was helpful. Now that it is summer....
The Passive Aircraft Receiver is basically an amplified "crystal radio" designed to receive nearby AM aircraft transmissions. The "passive" design uses no oscillators or other RF circuitry capable of interfering with aircraft communications so it should be....
With the wide application of SMT technology in products such as the computer, network communication, consuming electron and car electron, etc. , the assembly of the electronic product prones to complicating, high precision, melting and multi-functional....
Here I have described how to connect a 16 by 2 LCD display to a microcontroller. Here I have demostrated it with very common pic 16F877A. This is the circuit diagram. Here I haven`t showed the power supply and oscillator connection for pic and LCD. LCD....
infrared remote controlled switch is second remote controlled project in this website using 555 ic circuit diagram with description of remote controlled switch...
Circuit PT2399 digital Echo Circuit schematics Circuit Electronics, Digital Echo Processor IC PT2399 is using CMOS technology in audio purposes. digital Echo Processor PT2399 is implementing the system in the process of ADC and DAC audio r....
An electric fence, perimeter protection circuit, designed to run on batteries, and provide configurable pulses of up to 20KV, to protect a tent perimeter against bears or other animals, out in the wild. The device uses two 555 timer circuits to generated a....
DX TV enthusiasts often have to deal with relatively crowded VHF bands. In these instances, reduced TV receiver bandwidth results in greater selectivity. The other advantage of bandwidth reduction is improved signal to noise ratio. This results in less noise....
The ADV7390/ADV7391/ADV7392/ADV7393 are a family of high speed, digital-to-analog video encoders on single monolithic chips. Three 2.7 V/3.3 V 10-bit video DACs provide support for composite (CVBS), S-Video (YC), or component (YPrPb/RGB) analog outputs in....
This simple circuit is build around a CMOS IC 4060 to obtain the required timing. During day time the LDR has low resistance and keeps the pin 12 of the IC1 high, preventing the IC1 from oscillating. When it is dark the LDR resistance becomes high and the....
Communication with the MCP3028 ADC chip is done using a simple serial interface compatible with the SPI protocol. The Pic16f84 or Pic16f628 didn`t had hardware SPI peripheral. However, software implemeted SPI protocol can be done to communicate with 12 bit....
This power supply electronic circuit is a high current 5 volts power supply circuit that use a 7805 voltage regulator and some classic electronic components. T1 acts as a current limiter. Once the voltage on R2 + R3 is greater than 0. 6 0. 7 V, the....
This is a simple hardware computer interface and Linux program which can be used to control the most commonly used buttons on any consumer Family Radio Service (FRS) or General Mobile Radio Service (GMRS) radio. There are 22 available FRS/GMRS frequencies in....
I`ve been putting in a lot of extra hours at work the last week in anticipation of an editing deadline. Despite this, I thought it was about time that I attempt a little hardware hacking. Even before computers, I was facinated by electronics. I read book....
For C3, the 100pF across R2. The circuit does exactly the same thing, once again with no explanation. Apparently the utility ought to be obvious, but I`m new to earnest analog electronics. I can only assume that it`s stabilizing something, but I don`tknow....
Two diodes in feedback path or LM324 opamp create musical-instrument effect known as fuzz by limiting output voltage swing to ±0. 7 V. Resultant square wave contains chiefly odd harmonics, resembling sounds of clarinet. Fuzz depth pot controls level at which....
This phone is loud ringing tone circuit for generating the electricity bell in the old telephone. This circuit is relatively loud. so can use to replacement the same ringer or the original telephone may be lost. We do not need a new phone. The detect ringing....
This project creates a RGB LED lit love heart which is controlled by a PIC12F683 microcontroller. I designed the project as a gift for my wife on our 15th wedding anniversary (since she puts up with my addiction to electronics I thought she deserved....
The project described in this article is a constant Q, fully expandable graphic equaliser. Where most conventional graphic EQ circuits have a Q that is dependent on the setting of the pot, this one maintains the same Q at all settings. This is achieved by....
In contrast to traditional small-signal approaches, the use of large-signal, time-domain design techniques helps deliver low-noise grounded-base oscillators for VHF/UHF applications....
A common piezoelectric alarm, such as the Murata (Smyrna, GA) PKB5-3A shown, has many valuable attributes. It is compact, lightweight, efficient and reliable. However, the loud, high-pitched sound output can be quite irritating in many applications. The....
If your letterbox is some distance from your house, you will find a monitoring device useful to indicate when new post has arrived. This can take the form of a US-style visible flag; a more modern alternative uses a 433 MHz radio transceiver. The big....
As I often drive on motorways, I always and frequently use the direction indicators in order to show the lane change. I normally did this by holding a ....
The bi-directional sequencer uses a 4 bit binary up/down counter (CD4516) and two "1 of 8 line decoders" (74HC138 or 74HCT138) to generate the popular "Night Rider" display. A Schmitt Trigger oscillator provides the clock signal for the counter and the rate....
In normal suburban driving you pass through so many different speed zones that it can be a nuisance having to switch speed settings. The speed display can....
I have received a number of emails requesting schematics for infa-red remotes. So here is one. This remote transmits a tone using an infa-red LED. This tone is decoded by the receiver. Since the receiver only switches when it "hears" the tone, there are no....
The diagram shows a set of cell diode capacitor connected in series, each set of increasing voltage 300 V. This Supply generates DC high voltage 40kV, with which you can make interesting experiments. With the available 40 kV capacitors, 160 kV output voltage....
Using the latest generation of trench and polar power MOSFET technologies, we have developed both trench and polar P-Channel power MOSFETs that retain all the features of comparable N-Channel power MOSFETs such as very fast switching, voltage control, ease....
Presented here is a Long Range FM Transmitter. This circuit is a super-sensitive, mini-powered FM transmitter consisting of a RF (radio Frequency) oscillator section interfaced with a high sensitivity, wide pass-band audio amplifier and capacitance mike with....
The Haynes manuals is extremely confusing regarding the labeling of the relays on Spitfires. The two ways they confuse readers is 1. the illustrations show right hand drive cars with different locations for relays, and 2. the naming of the relays is strange....
The circuit M8031 has a built-in RC oscillator and digital envelope circuits that make it to require few external components. The sound generated by the M8031 simulate an mechanical ding-dong sound. The M8031 operates from a low input voltage from 1. 3 to 3.....
This simple circuit uses a 741 op-amp in differential mode as a continuity tester. The voltage difference between the non-inverting and inverting inputs is amplified by the full open loop gain of the op-amp. Ignore the 470k and the 10k control for the....
In case the robot being on the black line, it will always go ahead, and in the case of out of line and fall into a white area, it will determine whether to correct to the left or right, and thus remain on the black line. The sensors that will be used is the....
This is a simplified version of the Universal Keypad-Operated Switch. I have modified the design to reduce the complexity of the circuit - and the number of components required. As a result - the code is somewhat less secure. However, there should be lots of....
The heart of this DIY metal detector circuit is CS209A. The metal detector is build with one 100 µH coil. CS209A has one oscillator which forms a LC circuit, the inductance of the coil will change when it is near metal objects. LED 1 will light and the....
Short circuits or broken pcb tracks can be easily recognized by means of a Multimeter, but this tool can give wrong results when testing the efficiency of a transistor or diode, unless the device under test is unsoldered and removed from the pcb. A further....
This is a monostable multivibrator circuit that employs a single op amp. The main component of this circuit is the 741, a general-purpose operational amplifier. A monostable multivibrator is a timing circuit that changes state once triggered, but returns to....
