New Circuits Page 196
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Here is a circuit Power Amplifier with output power of more than 600 Watt speakers with impedance of 4 Ohm. Power Amplifier circuit with high power uses n-channel MOSFETs 6 in the output stage alone is giving about 400Watt power. And to make more than....
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A signal averager circuit can be formed by an amplifier and active signal rectifier, which is implemented using two operational amplifiers in this circuit. The....
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This circuit takes two separate line-level stereo (L & R) signals and combines them into one stereo (L & R) output, thus avoiding the need to switch betwe....
-
The purpose of this circuit was to create a ring in which LEDs or Lamps illuminate sequentially. Its main feature is a high versatility: you can build a loop containing any number of LEDs or Lamps, as each illuminating device has its own small circuit. The....
-
Figure 1 shows a circuit for sensing the water level in a tank and turning on or off a water pump accordingly. The main component of the circuit is the CD-4011 Quad NAND gate, three gates of which are used as shown in Figure 1 (gates G1, G2, and G3). G1 is....
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I think the zener diode is not producing enough current on its breakdown state to turn on the transistor. I tried removing the resistor R2 but still won`t work. Can you help me how to make this work First, the zener looks like the voltage selection might be....
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This circuit was designed to not fry the 555 timer, this is because I noticed that having the ignition coil share a high voltage contact with a power connector made somewhat high voltages go back and into the 555 timer, thus frying it (I went through about 7....
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This is a charger circuit for both NiCd and NiMh Batteries. Some time ago I aquired an old commercial handheld-TRX which was powered by a 12 Volt NiCd-Battery pack (10 Button Cells each having a capacity of 280mAh). In fact this (at least 10 year) old....
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-
The following circuit shows about Set Timing Calculator Circuit. This Circuit based on the LM555IC. Features: provide a delay of approximately ....
-
-
Here`s a simple experiment with LDR and CD4093. This is just a modification of a previous project dark sensor using 2 transistors . In this project, the CD4093 is configured in such a way that whenever you block light falling on LDR, the circuit starts....
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-
TL072 is amplifying an audio signal which is going to speakers & arduino analog input. Amp is powered by a wall wart with 12V 2A output. The same 12V is also regulated to 5V and used to power an AVR. The AVR is being used to PWM, using a power....
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The ADP1649 is a very compact, highly efficient, single white LED flash driver for high resolution camera phones that improves picture and video quality in....
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The 555 on the right is wired as an alarm sound generator and the second 555 timer on the left is a 1 Hz astable multivibrator. The output of the left timer is to modulate the frequency of the right timer. This process will cause the right timers frequency....
-
This circuit will produce outputs on TV lines 24 and 257. It was used for a decoder circuit. It uses a CMOS counter and gate logic. Only one pin is used for the output line indicator. ..
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A sensitive detector for static electricity based around a single Field Effect Transistor It can also be used to detect the presence of negative ions, or test a negative ion generator. This circuit utilizes the extra high input impedance of a FET, and also....
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This is a design for fire alarm circuit. This circuit is based on a LDR and lamp pair for sensing the fire. The alarm will works by sensing the smoke produced during fire. The circuit produces an audible alarm when the fire breaks out with smoke. This is the....
-
This module uses the highly integrated MAX2830 RF transceiver. It is a complete RF front-end solution that meets the WLAN IEEESM 802.11b/g standard....
-
The CF5019 series are high-frequency, 3rd overtone crystal Oscillator module ICs. They incorporate an oscilla- tor circuit and an output Buffer that operate at high frequency on a single chip. The Oscillator circuit employs CMOS inverters and a built-in....
-
Two LED CMOS Flasher Circuit Diagram This is a simple 2 led cmos robot ( flasher, multivibrator ) circuit using CD4069 six inverter....
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The purpose of this circuit is that of power a lamp or other apparatus for a given time (30 minutes in this case), and then to turn it off. It`s useful when reading at bed by night, turning off the bedside lamp automatically in case the reader falls asleep.....
-
This project shows you how to build a robot voice generator with IC HT8950, a powerful voice modulating IC. The circuit has Robot function, Vibrato function and....
-
This following circuit shows a 3A Switching Regulator Circuit. This circuit based on the LM317K IC. This is a simple and low cost switching ....
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The JBL "Bass Wave"amplifier is a small 100-watt amplifier with built-in active filter with a single-pole high-pass at 10 Hz combined with a single-pole lowpass at 85 Hz. It costs an amazingly low $50 US. It also comes with line and speaker-level inputs and....
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This is a little audio amplifier, it is similar to the audio amplifier which is used in small transistor radio. This circuit draws about 30 milliamps from a 9 volt supply. This circuit consist of two stage. First stage is input stage (2N3053 transistor) and....
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The signal from a microphone is two weak for a standard line input. This low-noise DC-coupled microphone amplifier provides a solution for anyone who wants to connect a microphone to his or her hi- installation. As can be seen from the schematic diagram, a....
-
This circuit shows the adjustable regulator circuit is conjunction with a voltage regulator, but on this circuit using the LM117 regulator of alternative flows in addition to providing a reference, not a diode LM113. Both regulators currently require a....
-
The Axe Grinder is designed with a few key fetures in mind, it not only serves a wide range of distortion sounds clipping part of the effect, it also gives the user the ability to overload their amp with a greatly boosted clean tone. The distorted tone and....
-
-
Using the LA4440 audio amplifier IC can be designed a very simple stereo power audio amplifier electronic project, that will provide a 6 watt output power into a 8 ohms load. Some features of this audio amplifier IC are: minimum number of external parts....
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This circuit uses three easily available 555 timer ICs. All three work as astable multivibrators. The first 555 has an on period and off period equal to 1 sec. This IC controls the on/ off periods of the other 2 555s which are used to flash two bulbs through....
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The thermistor used has a resistance of 15k at 25 degrees and 45k at 0 degrees celsius. A suitable bead type thermistor is found in the Maplin catalogue. The 100k pot allows this circuit to trigger over a wide range of temperatures. A slight amount of....
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With DC control voltage of 5 mV to 5 V, circuit controls frequency of both square and triangle outputs with good linearity. Peak value of triangle output is precisely set at 2. 44 V and 0 V by reference voltages at noninverting inputs of comparators.....
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When the games timer is RESET, two things must happen. The 4017 counter must go back to zero and the 4060 astable/divider must go back to zero. (If we left the 4060 running, it would not be synchronised with the 4017 and erratic times would result. ) The....
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Design Goal: The JavaBot1 is a small line following robot designed to follow a black line drawn on a dry erase board. It is designed to follow very tight c....
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Unfortunatately this only provides 1. 8v signals and still needs a converter to interface to the 3. 3v signals most raw LCD use. The main components is the TFP101A. I got mine as a free sample from TI. Also visible in this picture is the fact that only the....
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Currently have a decent interrupt-driven RS/232 driver with support for hardware flow control running at 9600 bps. Higher baud rates are possible but I have not yet tested for stability. I also implemented some helper routines to print and get strings,....
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Today`s electronic systems are in a continuing, evolving design cycle where more smaller, and hotter components are being crammed into tight enclosures. These expensive systems need to remain dependable and reliable. A fan failure may result in other....
-
The circuit detects a sudden shadow falling on the light-sensor and sounds the bleeper when this happens. The circuit will not respond to gradual changes in brightness to avoid false alarms. The bleeper sounds for only a short time to prevent the battery....
-
The example below illustrates using an op-amp as an audio amplifier for a simple intercom. A small 8 ohm speaker is used as a microphone which is coupled to the op-amp input through a 0.1uF capacitor. The speaker is sensitive to low frequencies and the small....
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It is the conversion circuit, which can transform ±10V voltage into ±lmA, and the input voltage is changed into current by the A1 and VTl, VT2, and it is used to change the current direction. The input end is added 2mA bias current, when the input voltage is....
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In our first program, we will simply sweep the servomotor from CCW to CW and then sweep back. The program will be kept simple as to demonstrate the priniciples of controlling a servo with a the PIC Basic language. The schematic can be seen in figure 2....
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-
The Link circuitry is simple and efficient, employing just two ICs, half a dozen transistors, and a handful of garden variety components. It all runs on 12 volts and is easily assembled. You can have your own home intercom between the kitchen, the garage,....
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Level refers to the relative strength of the signal and is measured in decibels. LINE level sources are much-amplified signals over MIC (microphone) level signals. Line level is usually between -10 to +4 dbm in strength while MIC levels are normally -60 dbm.....
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-
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Discrete blinking LEDs are convenient, but the blink rate and blink duration are not configurable. I tried goofing around with using transistors, resistors, and capacitors to alter the blinking LED. In the end, I had so many extra electronic components that....
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Parts List The circuit was specially designed for shop windows animation as it makes use of a capacitive sensor that is triggered by touch control system ..
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The following circuit shows about Power Amplifier Circuit Diagram. This circuit using 2N3055 Transistor.Features: 500ohm current, 50V optimal ....
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-
voltage-controlled oscillator. An oscillator whose frequency of oscillation can be varied by changing an applied....
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The Hopping Decoder is used together with the Hopping Encoder device to decode address data, key data and rolling data. It uses the DES24 encryption algorithm decoding format. Because each time the Hopping Encoder key is pressed, the rolling data will....
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This is a 16X2 switcher so it gives me plenty of room for expansion. While the cameras are nice, what I really wanted was the ability to pan and tilt selected cameras to change the view if necessary. I did quite a bit of searching and most of the pan and....
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This circuit is capable of amplifying the output from a 150-ohm dynamic microphone to line level in a single stage, courtesy of a little thing called an instrumentation amplifier. They`re like op-amps but with settable gain and much better common-mode....
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A very simple 12v battery charger circuit can be designed using a TIP3055 power transistor to limit the current to the battery by turning off when the battery voltage reaches approx 14v or if the current rises above 2 amp. This battery charger electronic....
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In the circuit here it simply biases the BC558 which, in turn, makes LED D1 flash in sympathy with the telegram from the remote control. The preset in the circuit determines the sensitivity...
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If resistors R1 to R4 are variable, the signals can be mixed in any proportion, meaning at any volume levels. And overall volume can be set by a variable resistor in series with Rf. ..
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Looking for an efficient USB charger that can operate from a 12V car battery This unit functions at up to 89% efficiency and can charge USB devices at currents up to 525mA. Best of all, it won`t flatten the battery if it`s left permanently connected, as long....
-
-
This circuit uses the popular and easy to find LM3914 IC. This IC is very simple to drive, needs no voltage regulators (it has a built in voltage regulator) and can be powered from almost every source. When the test button is pressed, the Car battery voltage....
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And normally tuning is not easy: you`ll fire the system up and try to notice the spark length, shut it off (and pull the plug!), re-tune (move the tap on the primary), fire it up again and try to remember the spark length of the run before, and do it all....
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-
-
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This is a simple FM transmitter circuit schematic diagram with a single transistor S9014....
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This project implements a half-duplex, master/slave communications protocol based on RS-485 bus hardware. A Windows PC plays the role of bus-master and several Atmel 8-bit AVRs assume the role of bus-slaves. The Windows part is written in C+, the ninth data....
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Wind 6 turns of solid wire on a pen or pencil that is just under 1/2 inch in diameter. Remove the wire from the pencil and spread the winding to make a length of 3/4 inch. Solder C2 somewhere near the middle of the coil...
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Wireless Imaging Intruder Alarm app enables Home Security Smartphones to detect and send burglar pictures direct to your personal cell phone, PDA or computer within a few seconds of a break-in at your home or business when you are away. Code Alarm Security....
-
A simple thermostat circuit that can be used to control a relay and supply power to a small space heater through the relay contacts. The relay contacts should be rated above the current requirements for the heater. Temperature changes are detected by a (1.....
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I know the general rule of world that reading makes man ready, writing makes man everyday but practice makes man perfect. Only theoretical knowledge is not enough for an E. C (Electronics and communication engineering)student. A project is one of the....
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Here is the circuit diagram of a fully transistorized inverter that can drive up to 60W loads. Transistors Q1 and Q2 forms a 50Hz astable multivibrator. The output from the collector of Q2 is connected to the input of the Darlington pair formed by Q3 and Q4.....
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A step motor controller based on the schematics found on the Arduino Web site. First I try the 2 pins one for bipolar stepper motor. I wont be able to make it work, even less with the library available on the site. Maybe I`m dumb and I really dont understand....
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The stator output is AC, a battery is DC. You will have to add a rectifier to change the output to DC, and this will use up avaiable watts. I have been told you could lose 10-15 watts by using a rectifier. (I`m not THAT much of an electronics wizz, so I`m....
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Colpitts oscillator circuit is shown in Figure 1, Q is the transistor. The Colpitts and Hartley oscillator circuit are similar, except the inductor, capacitor exchange of positions. Oscillator equivalent circuit shown in Figure 2. Capacitors C1, C2, and....
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Lamp dimmer. The figure below shows the circuit can be used for lamp dimming. It uses a small quantity of components, which can be installed inside the lamp seat. The circuit is commonly used in RC phase shift circuit. W can be adjusted to change the triac....
-
A novel method of hydrogen generation by water electrolysis using an ultra-short-pulse power supply Authors: NAOHIRO SHIMIZU, SOUZABURO HOTTA, TAKAYUKI SEKIYA and OSAMU ODA Abstract A novel method of hydrogen generation by water electrolysis using....
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The current source in the diagram, which react very fast to changes in the input signal, may be used, for instance, in certain measurements. Differential amplifier IC1 ensures that the potential across R2 is equal to the input voltage: Iout =Uin/R2. The....
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This circuit uses invisible infrared light to detect the movement of people through the door. A short beep will be generated when the infrared beam breaks ..
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This is flashing LED circuit emulate the turning of incandescent lamp. The characteristic of incandescent lamp is that they can`t abruptly change the....
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The counter must be programmed as part of a batch-counting operation to sort parts automatically for quality control. The counter is installed to divert 1 part out of every 10 for quality control or inspection process. The circuit operates as follows...
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The circuit provided right here allows up to eight participants with each one assigned a unique number (1 to 8). The display will show the number of the Electronic jam circuit diagram. contestant pushing his button prior to the others. Concurrently, a buzzer....
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555 timer is used as clock to drive RS7490 decimal timer, BCD output to 7 section LED. To adjust R1 can change the clock frequency....
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This simple circuit can monitor the charging process in 12 Volt Lead Acid battery or Tubular battery. The status of LED indicates whether the battery is accepting charge or not. It also indicates the full charge condition. The circuit can be incorporated in....
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This microphone circuit was submitted by Lazar Pancic from Yugoslavia. The sound card for a PC generally has a microphone input, speaker output and sometimes line inputs and outputs. The mic input is designed for dynamic microphones only in impedance range....
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The hydraulic system includes pump No. 8 (Drawing 10) installed on the gearbox, dispenser (1), oil tank (4), hydraulic jack (5) and oil conduits. From the tank oil moves along conduit (9), sucked in the pump (8) and gets into dispenser (1) via conduit (7).....
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The LM4844 is an integrated Audio sub-system designed for stereo cell phone applications. Operating on a 3. 3V supply, it combines a stereo speaker Amplifier delivering 495mW per channel into an 8& load and a stereo OCL Headphone Amplifier delivering 33mW....
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MiniVol is my effort at a very simple volume control board based on the excellent TI PGA2320 volume control IC, which offers impressive specs and can operate over a range of -95. 5dB to +31. 5dB. It utilises a small Atmel AVR microcontroller to control the....
Here is a circuit Power Amplifier with output power of more than 600 Watt speakers with impedance of 4 Ohm. Power Amplifier circuit with high power uses n-channel MOSFETs 6 in the output stage alone is giving about 400Watt power. And to make more than....
A signal averager circuit can be formed by an amplifier and active signal rectifier, which is implemented using two operational amplifiers in this circuit. The....
This circuit takes two separate line-level stereo (L & R) signals and combines them into one stereo (L & R) output, thus avoiding the need to switch betwe....
The purpose of this circuit was to create a ring in which LEDs or Lamps illuminate sequentially. Its main feature is a high versatility: you can build a loop containing any number of LEDs or Lamps, as each illuminating device has its own small circuit. The....
Figure 1 shows a circuit for sensing the water level in a tank and turning on or off a water pump accordingly. The main component of the circuit is the CD-4011 Quad NAND gate, three gates of which are used as shown in Figure 1 (gates G1, G2, and G3). G1 is....
I think the zener diode is not producing enough current on its breakdown state to turn on the transistor. I tried removing the resistor R2 but still won`t work. Can you help me how to make this work First, the zener looks like the voltage selection might be....
This circuit was designed to not fry the 555 timer, this is because I noticed that having the ignition coil share a high voltage contact with a power connector made somewhat high voltages go back and into the 555 timer, thus frying it (I went through about 7....
This is a charger circuit for both NiCd and NiMh Batteries. Some time ago I aquired an old commercial handheld-TRX which was powered by a 12 Volt NiCd-Battery pack (10 Button Cells each having a capacity of 280mAh). In fact this (at least 10 year) old....
The following circuit shows about Set Timing Calculator Circuit. This Circuit based on the LM555IC. Features: provide a delay of approximately ....
Here`s a simple experiment with LDR and CD4093. This is just a modification of a previous project dark sensor using 2 transistors . In this project, the CD4093 is configured in such a way that whenever you block light falling on LDR, the circuit starts....
TL072 is amplifying an audio signal which is going to speakers & arduino analog input. Amp is powered by a wall wart with 12V 2A output. The same 12V is also regulated to 5V and used to power an AVR. The AVR is being used to PWM, using a power....
The ADP1649 is a very compact, highly efficient, single white LED flash driver for high resolution camera phones that improves picture and video quality in....
The 555 on the right is wired as an alarm sound generator and the second 555 timer on the left is a 1 Hz astable multivibrator. The output of the left timer is to modulate the frequency of the right timer. This process will cause the right timers frequency....
This circuit will produce outputs on TV lines 24 and 257. It was used for a decoder circuit. It uses a CMOS counter and gate logic. Only one pin is used for the output line indicator. ..
A sensitive detector for static electricity based around a single Field Effect Transistor It can also be used to detect the presence of negative ions, or test a negative ion generator. This circuit utilizes the extra high input impedance of a FET, and also....
This is a design for fire alarm circuit. This circuit is based on a LDR and lamp pair for sensing the fire. The alarm will works by sensing the smoke produced during fire. The circuit produces an audible alarm when the fire breaks out with smoke. This is the....
This module uses the highly integrated MAX2830 RF transceiver. It is a complete RF front-end solution that meets the WLAN IEEESM 802.11b/g standard....
The CF5019 series are high-frequency, 3rd overtone crystal Oscillator module ICs. They incorporate an oscilla- tor circuit and an output Buffer that operate at high frequency on a single chip. The Oscillator circuit employs CMOS inverters and a built-in....
Two LED CMOS Flasher Circuit Diagram This is a simple 2 led cmos robot ( flasher, multivibrator ) circuit using CD4069 six inverter....
The purpose of this circuit is that of power a lamp or other apparatus for a given time (30 minutes in this case), and then to turn it off. It`s useful when reading at bed by night, turning off the bedside lamp automatically in case the reader falls asleep.....
This project shows you how to build a robot voice generator with IC HT8950, a powerful voice modulating IC. The circuit has Robot function, Vibrato function and....
This following circuit shows a 3A Switching Regulator Circuit. This circuit based on the LM317K IC. This is a simple and low cost switching ....
The JBL "Bass Wave"amplifier is a small 100-watt amplifier with built-in active filter with a single-pole high-pass at 10 Hz combined with a single-pole lowpass at 85 Hz. It costs an amazingly low $50 US. It also comes with line and speaker-level inputs and....
This is a little audio amplifier, it is similar to the audio amplifier which is used in small transistor radio. This circuit draws about 30 milliamps from a 9 volt supply. This circuit consist of two stage. First stage is input stage (2N3053 transistor) and....
The signal from a microphone is two weak for a standard line input. This low-noise DC-coupled microphone amplifier provides a solution for anyone who wants to connect a microphone to his or her hi- installation. As can be seen from the schematic diagram, a....
This circuit shows the adjustable regulator circuit is conjunction with a voltage regulator, but on this circuit using the LM117 regulator of alternative flows in addition to providing a reference, not a diode LM113. Both regulators currently require a....
The Axe Grinder is designed with a few key fetures in mind, it not only serves a wide range of distortion sounds clipping part of the effect, it also gives the user the ability to overload their amp with a greatly boosted clean tone. The distorted tone and....
Using the LA4440 audio amplifier IC can be designed a very simple stereo power audio amplifier electronic project, that will provide a 6 watt output power into a 8 ohms load. Some features of this audio amplifier IC are: minimum number of external parts....
This circuit uses three easily available 555 timer ICs. All three work as astable multivibrators. The first 555 has an on period and off period equal to 1 sec. This IC controls the on/ off periods of the other 2 555s which are used to flash two bulbs through....
The thermistor used has a resistance of 15k at 25 degrees and 45k at 0 degrees celsius. A suitable bead type thermistor is found in the Maplin catalogue. The 100k pot allows this circuit to trigger over a wide range of temperatures. A slight amount of....
With DC control voltage of 5 mV to 5 V, circuit controls frequency of both square and triangle outputs with good linearity. Peak value of triangle output is precisely set at 2. 44 V and 0 V by reference voltages at noninverting inputs of comparators.....
When the games timer is RESET, two things must happen. The 4017 counter must go back to zero and the 4060 astable/divider must go back to zero. (If we left the 4060 running, it would not be synchronised with the 4017 and erratic times would result. ) The....
Design Goal: The JavaBot1 is a small line following robot designed to follow a black line drawn on a dry erase board. It is designed to follow very tight c....
Unfortunatately this only provides 1. 8v signals and still needs a converter to interface to the 3. 3v signals most raw LCD use. The main components is the TFP101A. I got mine as a free sample from TI. Also visible in this picture is the fact that only the....
Currently have a decent interrupt-driven RS/232 driver with support for hardware flow control running at 9600 bps. Higher baud rates are possible but I have not yet tested for stability. I also implemented some helper routines to print and get strings,....
Today`s electronic systems are in a continuing, evolving design cycle where more smaller, and hotter components are being crammed into tight enclosures. These expensive systems need to remain dependable and reliable. A fan failure may result in other....
The circuit detects a sudden shadow falling on the light-sensor and sounds the bleeper when this happens. The circuit will not respond to gradual changes in brightness to avoid false alarms. The bleeper sounds for only a short time to prevent the battery....
The example below illustrates using an op-amp as an audio amplifier for a simple intercom. A small 8 ohm speaker is used as a microphone which is coupled to the op-amp input through a 0.1uF capacitor. The speaker is sensitive to low frequencies and the small....
It is the conversion circuit, which can transform ±10V voltage into ±lmA, and the input voltage is changed into current by the A1 and VTl, VT2, and it is used to change the current direction. The input end is added 2mA bias current, when the input voltage is....
In our first program, we will simply sweep the servomotor from CCW to CW and then sweep back. The program will be kept simple as to demonstrate the priniciples of controlling a servo with a the PIC Basic language. The schematic can be seen in figure 2....
The Link circuitry is simple and efficient, employing just two ICs, half a dozen transistors, and a handful of garden variety components. It all runs on 12 volts and is easily assembled. You can have your own home intercom between the kitchen, the garage,....
Level refers to the relative strength of the signal and is measured in decibels. LINE level sources are much-amplified signals over MIC (microphone) level signals. Line level is usually between -10 to +4 dbm in strength while MIC levels are normally -60 dbm.....
Discrete blinking LEDs are convenient, but the blink rate and blink duration are not configurable. I tried goofing around with using transistors, resistors, and capacitors to alter the blinking LED. In the end, I had so many extra electronic components that....
Parts List The circuit was specially designed for shop windows animation as it makes use of a capacitive sensor that is triggered by touch control system ..
The following circuit shows about Power Amplifier Circuit Diagram. This circuit using 2N3055 Transistor.Features: 500ohm current, 50V optimal ....
voltage-controlled oscillator. An oscillator whose frequency of oscillation can be varied by changing an applied....
The Hopping Decoder is used together with the Hopping Encoder device to decode address data, key data and rolling data. It uses the DES24 encryption algorithm decoding format. Because each time the Hopping Encoder key is pressed, the rolling data will....
This is a 16X2 switcher so it gives me plenty of room for expansion. While the cameras are nice, what I really wanted was the ability to pan and tilt selected cameras to change the view if necessary. I did quite a bit of searching and most of the pan and....
This circuit is capable of amplifying the output from a 150-ohm dynamic microphone to line level in a single stage, courtesy of a little thing called an instrumentation amplifier. They`re like op-amps but with settable gain and much better common-mode....
A very simple 12v battery charger circuit can be designed using a TIP3055 power transistor to limit the current to the battery by turning off when the battery voltage reaches approx 14v or if the current rises above 2 amp. This battery charger electronic....
In the circuit here it simply biases the BC558 which, in turn, makes LED D1 flash in sympathy with the telegram from the remote control. The preset in the circuit determines the sensitivity...
If resistors R1 to R4 are variable, the signals can be mixed in any proportion, meaning at any volume levels. And overall volume can be set by a variable resistor in series with Rf. ..
Looking for an efficient USB charger that can operate from a 12V car battery This unit functions at up to 89% efficiency and can charge USB devices at currents up to 525mA. Best of all, it won`t flatten the battery if it`s left permanently connected, as long....
This circuit uses the popular and easy to find LM3914 IC. This IC is very simple to drive, needs no voltage regulators (it has a built in voltage regulator) and can be powered from almost every source. When the test button is pressed, the Car battery voltage....
And normally tuning is not easy: you`ll fire the system up and try to notice the spark length, shut it off (and pull the plug!), re-tune (move the tap on the primary), fire it up again and try to remember the spark length of the run before, and do it all....
This is a simple FM transmitter circuit schematic diagram with a single transistor S9014....
This project implements a half-duplex, master/slave communications protocol based on RS-485 bus hardware. A Windows PC plays the role of bus-master and several Atmel 8-bit AVRs assume the role of bus-slaves. The Windows part is written in C+, the ninth data....
Wind 6 turns of solid wire on a pen or pencil that is just under 1/2 inch in diameter. Remove the wire from the pencil and spread the winding to make a length of 3/4 inch. Solder C2 somewhere near the middle of the coil...
Wireless Imaging Intruder Alarm app enables Home Security Smartphones to detect and send burglar pictures direct to your personal cell phone, PDA or computer within a few seconds of a break-in at your home or business when you are away. Code Alarm Security....
A simple thermostat circuit that can be used to control a relay and supply power to a small space heater through the relay contacts. The relay contacts should be rated above the current requirements for the heater. Temperature changes are detected by a (1.....
I know the general rule of world that reading makes man ready, writing makes man everyday but practice makes man perfect. Only theoretical knowledge is not enough for an E. C (Electronics and communication engineering)student. A project is one of the....
Here is the circuit diagram of a fully transistorized inverter that can drive up to 60W loads. Transistors Q1 and Q2 forms a 50Hz astable multivibrator. The output from the collector of Q2 is connected to the input of the Darlington pair formed by Q3 and Q4.....
A step motor controller based on the schematics found on the Arduino Web site. First I try the 2 pins one for bipolar stepper motor. I wont be able to make it work, even less with the library available on the site. Maybe I`m dumb and I really dont understand....
The stator output is AC, a battery is DC. You will have to add a rectifier to change the output to DC, and this will use up avaiable watts. I have been told you could lose 10-15 watts by using a rectifier. (I`m not THAT much of an electronics wizz, so I`m....
Colpitts oscillator circuit is shown in Figure 1, Q is the transistor. The Colpitts and Hartley oscillator circuit are similar, except the inductor, capacitor exchange of positions. Oscillator equivalent circuit shown in Figure 2. Capacitors C1, C2, and....
Lamp dimmer. The figure below shows the circuit can be used for lamp dimming. It uses a small quantity of components, which can be installed inside the lamp seat. The circuit is commonly used in RC phase shift circuit. W can be adjusted to change the triac....
A novel method of hydrogen generation by water electrolysis using an ultra-short-pulse power supply Authors: NAOHIRO SHIMIZU, SOUZABURO HOTTA, TAKAYUKI SEKIYA and OSAMU ODA Abstract A novel method of hydrogen generation by water electrolysis using....
The current source in the diagram, which react very fast to changes in the input signal, may be used, for instance, in certain measurements. Differential amplifier IC1 ensures that the potential across R2 is equal to the input voltage: Iout =Uin/R2. The....
This circuit uses invisible infrared light to detect the movement of people through the door. A short beep will be generated when the infrared beam breaks ..
This is flashing LED circuit emulate the turning of incandescent lamp. The characteristic of incandescent lamp is that they can`t abruptly change the....
The counter must be programmed as part of a batch-counting operation to sort parts automatically for quality control. The counter is installed to divert 1 part out of every 10 for quality control or inspection process. The circuit operates as follows...
The circuit provided right here allows up to eight participants with each one assigned a unique number (1 to 8). The display will show the number of the Electronic jam circuit diagram. contestant pushing his button prior to the others. Concurrently, a buzzer....
555 timer is used as clock to drive RS7490 decimal timer, BCD output to 7 section LED. To adjust R1 can change the clock frequency....
This simple circuit can monitor the charging process in 12 Volt Lead Acid battery or Tubular battery. The status of LED indicates whether the battery is accepting charge or not. It also indicates the full charge condition. The circuit can be incorporated in....
This microphone circuit was submitted by Lazar Pancic from Yugoslavia. The sound card for a PC generally has a microphone input, speaker output and sometimes line inputs and outputs. The mic input is designed for dynamic microphones only in impedance range....
The hydraulic system includes pump No. 8 (Drawing 10) installed on the gearbox, dispenser (1), oil tank (4), hydraulic jack (5) and oil conduits. From the tank oil moves along conduit (9), sucked in the pump (8) and gets into dispenser (1) via conduit (7).....
The LM4844 is an integrated Audio sub-system designed for stereo cell phone applications. Operating on a 3. 3V supply, it combines a stereo speaker Amplifier delivering 495mW per channel into an 8& load and a stereo OCL Headphone Amplifier delivering 33mW....
MiniVol is my effort at a very simple volume control board based on the excellent TI PGA2320 volume control IC, which offers impressive specs and can operate over a range of -95. 5dB to +31. 5dB. It utilises a small Atmel AVR microcontroller to control the....
