New Circuits Page 61
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This electronic liquid detector circuit diagram is based on the ULN2429A monolithic bipolar integrated circuit designed for detecting the absence or presence of many different types of liquids. The absence or presence of the liquid is determined by comparing....
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This is an improved version of the Darkroom Timer originally created by Stan Ockers (1999). Some extra features were added and the PIC code was modified accordingly The complete schematic, PCB and silkscreen are available in high resolution pdf format. The....
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This micropower multifunction power management integrated circuit (PMIC) is designed using LTC3554 manufactured by Linear Technology Corporation and is a solution for portable Li-Ion Polymer battery-based applications. This micropower multifunction power....
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This nifty little circuit lets you record your phone conversations automatically. The device connects to the phone line, your tape recorder`s microphone input, and the recorder`s remote control jack. It senses the voltage in the phone line and begins....
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The circuit presented here makes amplitude modulation possible, and it also has the significant advantage that it replaces the somewhat exotic and quite e....
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The bootloader can be used for the all USB PIC devices (PIC18F4550, PIC18F4455, PIC18F2550, PIC18F2455, PIC18F4553, PIC18F4458, PIC18F2553, PIC18F2458). Since the bootloader is designed for the Microchip demo board, the configurationof the bootloader....
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circuit 1kz has an op amp component type with two inputs, output, and up and down ports, usually used for power supply rails. There`s also a buffer component type (which I think is provided by tikz itself, not the circuitikz library) which has one input and....
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The CT Scanner is the abbreviation of computer tomography scanner. The invention of CT Scanner in 1970 was made possible by a previously established insight and development of the dedicated minicomputers. A high DC voltage is applied to the capacitors an....
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The thermometer meter slinger circuit is composed of power supply circuit and meter slinger timing control circuit, it is shown in the figure 9-135. The power supply circuit is made of fuse FU, power supply button S(Sa, Sb), resistors R1, R2, capacitors C1,....
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Here`s a design for a simple 1KHz square wave generator using a few components and the LM3909 that is useful for testing audio equipment. The circuit is based from the IC. It is powered from a single 1. 5V battery cell and the maximum amplitude of the output....
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The ADUC845 MicroConverter is a fully integrated Dual 24-bit, Multi-Channel Sigma Delta ADC and Flash Microcontroller on a single chip. This device is a multi-channel extension of ADIs popular ADuC844 and ADuC846 MicroConverter family and is optimized for....
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Multiplexed display suitable for LED readouts is provided by circuit using TTL counters to count 60-Hz Iine.When count reaches o`clock, flip-flop M is set on evely cycle. Gate G3 then detects when time goes to 13 o`clock, and clears shift register.Carry....
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Vacuum tube electronic circuits operate from comparatively high DC voltages (150 to 600 volts). The Electric Utility supplies 120 volts AC. We have studied transformers and, therefore, we know that the 120 vAC line voltage could be stepped up to the....
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servo mechanism. A feedback system that consists of a sensing element, amplifier, and servomotor, used in the automatic control....
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The intercom schematic fulfills its tasks to provide a reliable communication line and is very simple to construct. The circuit is made up of an amplifier, two switches and two loudspeakers. If additional stations (speakers) are wished, additional switches....
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A diode is used in series to drop the voltage down to 5. 4 V as the operating voltage for the PIC microcontroller should be below 5. 5 V. Besides, the diode also provides the protection to the circuit in case of reverse polarity of the power supply. I have....
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Using this circuit, audio musical notes can be generated and heard up to a distance of 10 metres. The circuit can be divided into two parts: IR music transmitter and receiver. The IR music transmitter works off a 9V battery, while the IR music receiver works....
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For an upcoming project I needed a pneumatic ram with a closed loop control system so I could position it accurately. Didn`t have the budget for an off the shelf solution, so I bodged one together with an ardunio, a couple air solenoid valves, and a pair of....
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Many electronics hobbyists will have experienced the following: you try to finish a project late at night, and the mains supply fails. Whether that is caused by the electricity board or your carelessness isn`t really important. In any case, at such times you....
-
-
My major project over the last few months has been the construction of a small Tesla coil, having wanted to make one for many years now. My first experience was at a demo day at UNSW over a decade ago, and since then I`ve always had a bit of a fascination....
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Looking at different ways to do current sensing, using regular opamps, rather than dedicated chips like the MAX4073T/F/H, which work well, they are just rather expensive. So while poking around i found an article written by Bob Pease, , which talks about....
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The LM1036 is a DC controlled tone (bass/treble), volume and balance circuit for stereo applications in car radio, TV and audio systems. An additional control input allows loudness compensation to be simply effected. Four control inputs provide control of....
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The length of time the circuit stays on for depends on how long it takes for the stored electrical current to leak back into the circuit, keeping the transistor (and thus the entire circuit) energized. We have a resistor that is limiting the rate at which....
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The circuit of the Celsius thermometer in the diagram is based on the well-known Type LM334 from National Semiconductor. This IC is a sensor that provides....
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The Digital-Analog-Converter fetches one of 15 parallelly pressed keyboard keys from the digital bus of the synthesizer and converts it into a control voltage (1V/Octave) and a GATE signal. The TUNE-COARSE and TUNE-FINE pots allow pitch adjustment of the....
-
A function generator is a signal source that has the capability of producing different types of waveforms as its output signal. The most common output waveforms are sine-waves, triangular waves, square waves, and sawtooth waves. The frequencies of such....
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The L298N driver module contains the ST` L298N chip, ususlly used to drive two 3-30V DC motor, there is a 5V output interface, power for 5V single-chip circuitry, support 3. 3VMCU control. With it, you can control the DC motor easily. You can get the diagram....
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This PIN diode rf switch is the ideal antenna switch for VHF and UHF and work with the PIN diodes which are special high frequency switching diodes with ve....
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The ability to be able to read a 125Khz access card or keyfob at a large distance involves numerous factors including reader antenna size, radiated power, receiver sensitivity and the like. The reader cloner shown on the previous web page has the benefit of....
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Figure 1-22 (a) shows the circuit which could convert 0-+lOV input voltage Ui into the pulse with 0 -1OOkHz output frequency, and pin 7 of VFC320 is connected a resistor to directly connect to standard logic. Figure 1-22 (b) shows the the circuit which could....
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Create a simple (telephone based) intercom system in our new house. Shouting between rooms is not so good, and trying to use an IM client or Facetime doesn`t have the immediacy of a good shout down the corridor. I`ve got a box of old wired telephones that....
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A simple audio watt meter circuit or an audio power or audio level meter circuit with diagram and schematics to measure amplifier audio output power in watts....
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This infrared detector can be used to detect the presence of modulated infrared signals in its vicinity from any electronic source, for instance, an IR han....
-
On Halloween night, I reguarly have periods of 5, 10, and even 15 minutes where no ToTs are around. It seemed kind of silly to me to have the fogger spewing fog during such breaks by using a standard fogger timer. Instead, I decided to build my own custom....
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A constant-voltage active load can perform as a battery during the charge cycle. You can set the load voltage from 5 to 35V by using potentiometer PV and thus can simulate batteries ranging from 6 to 32V. In testing a battery charger (during design or for....
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The Chameleon II Power Supply Circuits take the raw input supply and provide the steady voltage supplies required by the Chamelon interfaces. The supplies are +5V, +12V and -12V...
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U1 is a Complex Interface Adapter (CIA). Both parallel ports are used to decode the keyswitches on the keyboard. Parallel port A signals (PA0 - PA7) are outputs. PArallel port B signals (PB0 - PB7) are inputs. A "0" bin is shifted through the parallel port....
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2012 Honda Odyssey Radio Wiring Diagram Manual PDF Download...
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the RF design and construction of radio frequency oscillators...
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A nice and compact setup, that works off-line, directly at 220V, with only a voltage doubler to get the plate voltage up to 560V DC. I don`t need to go into details explaining this circuit, it is a simple Armstrong oscillator, using the feedback coil L4.....
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This is a low voltage microphone preamplifier circuit with a 1. 5V power supply. The reference, with a 500 kHz unity-gain bandwidth, is used as a preamplifier with a gain of 100. Its output is fed through a gain-control potentiometer to the op amp, which is....
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i had a problem while designing a circuit in which BT 136TRIAC has to be triggered from a half rectified current of 30 mA at about 6V. Its not getting triggered. Even for this supply my trigger circuit is consuming power as the 4. 7k 10W resistor is getting....
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A simple Solar powered battery charger, photovoltaic charger circuit can be designed using LTC4071 Li-Ion/Polymer Shunt Battery Charger System with Low Battery Disconnect. When VCC reaches the programmed float voltage (4. 1V with ADJ floating) then the....
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At many situations we need to display the amount of battery charge through some kind of indication methods like LED dot display or LED bar display. Here CG comes with a battery charge indicator circuit using LED dot display. This battery power level....
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The Measured Value and The Setpoint are two inputs to a Control System. The Measured Value is the Amplified input of a Transducer or Sensor for some Parameter that needs to be controlled. It could be Pressure or Temperature etc. The Setpoint is the User....
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I am interested in building a solid state control for my Warn 8274 self recovery winch. The current control scheme uses 4 constant duty 200 amp solenoids. 2 switched in parallel to connect the field 1 terminal on the motor to the armature for power in, and....
-
-
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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This circuit uses a Cmos 4017 decade counter to create a sequence of four separate events. The number of events in the sequence may be increased to nine or ten. And the length of each event is controlled independently. You`re not limited to a series of -....
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An electrical circuit that ensures that when two or more generators are connected in parallel to a power system they share the load equally. In this arrangement, if the voltage of one generator is slightly higher than that of the other generator in parallel,....
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It takes a 32. 768 kHz IR input and outputs a logic low when the input is present. I see 3 distinct stages. everything up to U1A, everything between U1A and Q3 and everything to the right of Q3. I follow the left and the right. but not the center which is....
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Like field strength meter an RF detector circuit is also a useful project to detect a nearby RF signal. The circuit shown here can be used to detect wide band of RF frequencies and provide an alarm when it will detect an RF signal....
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Prototype board for 40 pin Atmel ATMega microcontrollers with power supply circuit, 8MHz crystal oscillator circuit, RS232 port, reset IC, status LED, and 10 pin STK ICSP port.FR-4, 1.5 ....
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Using a thermistor in the position shown makes a heat activated sensor. A change in temperature will alter the output of the opamp and energize the relay and light the LED. Swapping the position of the thermistor and 47k resistor makes a cold or frost alarm....
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his 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 accidental activations....
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If you need a typical circuit for any applications such Mobile phones, MP3 players, Portable electronics and etc using SSM2602 Low Power Audio Codec, we provide you with this SSM2602 Applications Circuit Schematic..
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This is the circuit diagram of USB powered computer speaker, or it widely known as multimedia speakers for PCs. The circuit has single-chipbased design, low-voltage electrical power supply, compatibility with USB power from computer, simple....
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The 555 timer IC was first introduced around 1971 by the Signetics Corporation as the SE555/NE555 and was called "The IC Time Machine" and was also the very first and only commercial timer ic available. It provided circuit designers and hobby tinkerers with....
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Tutorial on Interfacing the 20x4 LCD module to PC parallel port...
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This is a very simple liquid detector that use a relay to open an evacuation van. You can use it for water or any liquid that conduct electricity. Use any PNP transistor that can stand the relay current. Check out the new water level sensor circuit...
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Added a BASIC preprocessor made in python that allows you to write code withought line numbers and to use labels. the preprocessor adds the lines and changes the labels to line numbers. Also made an AmericanFootball BASIC game, as an example of how to use....
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That motor is rated for 6W which is 0.5 amps at 12V. I would use a 12V DC power supply rated at 1A or more. Any type will be OK. A plug-in adapter....
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This circuit will detect AC line currents of about 250mA or more without making any electrical connections to the line. Current is detected by passing on of the AC lines through an inductive pickup (L1) made with a 1 inch diameter U-bolt wound with 800 turns....
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This circuit in below is show the simple form of the thermometer circuit. The circuit is based on LM335 as sensing the temperature. This is the figure of the circuit. The circuit consists of two parts: The LM335 and its adjustment. The output of the LM335 is....
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Designing Audio amplifier from the scratch using discrete componentsis interesting, as it allow users to design amplifiers that can satisfy their various requirements. With audio amplifiers, low level sounds from mobile devices around us can be made more....
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This is a background music (SCA) decoder circuit from the input demodulated (multiplex) FM signal. We use NE565 (Phase Locked Loop IC) to be base of this....
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You need not be disappointed next time when your digital camera shows low battery indication during a picnic trip. Just plug this digital camera adaptor into the cigarette lighter outlet of your car and connect the camera to it. The adaptor will interface....
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Six timing positions suited to different skin types, Timing affected by sunlight intensity This timer was designed for people wanting to get tanned but at....
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The circuit in the diagram is a very handy tool for rapidly checking all kinds of thyristor (SCR, triac, ). In case of a triac, all four quadrants are tested, which is done with S3, while in case of a standard thyristor, a positive power supply and trigger....
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Using an MC25060V2 fan, and I`d like to switch it on and off through software occasionally (i. e. not PWM or anything fancy like that). My thought is to either put an NPN BJT or a N-channel MOSFET on the low side and control it`s gate with a 5V....
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A very interesting schematic of Flip flop LED flashing circuit. The circuit actually is an astable multivibrator which starts blinking LEDs one by one when power is applied. This LED flasher circuit can be operated with any voltage from 6 to 12 volts, you....
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This Line Following Robot sensor or surface scanner for robots is a very simple, stamp-sized, short range (5-10mm) Infrared proximity detector wired around....
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This logic probe features either high-low (LED) indication or latching operation. When S1 closed, the indication of a pulse is latched and the red LED1 stays on. Piezoelectric buzzer BZ1 used as a beeper to sound that a logic high is preset....
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Battery-Powered portable unit, Suitable for all type Televisions Using this low-cost project one can reproduce audio from TV without disturbing others. It....
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A schematic diagram of a fast pulse detector is show in the figure below. Error detection rate under 10% can be expected for 60 ns pulse. To get error free....
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I`ve got a button which I use as a push to talk switch. This works for the most part, however when I press the button it takes a good 5 seconds before I hear any output...
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Here is our robotic project; Robotrex. A robotic dinosaur. Its name comes from the words "Robot" and "tyrosaurus-Rex". Inspired from our older projects "Bigfoot" and "the Goggles", this project was built specially for our endtas. com fair stand in 2004 Izmir....
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This circuit generates a good 1KHz sinewave using the inverted Wien bridge configuration (C1-R3 & C2-R4). Features a variable output, low distortion and low output impedance in order to obtain good overload capability. A small filament lamp ensures a stable....
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Previously, an article was posted on how to connect to the Raspberry PI board from a Linux PC using the serial port. We now look at how to do the same thing using a Windows PC. In this article, a Windows 8 PC is connected to the Raspberry PI through a USB to....
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This is a relay circuit that detect the presence of sound to activate the relay. You can use this sound-controlled relay as voice operated switch, light...
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As some of you know, the Traynor YBA-1 is a very close derivative of the classic Bassman/JTM-45 circuit. I recently picked up a spectacularly clean `67 copy that was all original with the exception of a rather "crappy" fully reversible master volume mod and....
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One of the most useful gadgets a video enthusiast can have is a low-power VHF TV Transmitter. Such a device can transmit a signal from a VCR to any TV in a home or backyard. Imagine the convenience of being able to sit by the pool watching your favorite....
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The supply rails prudentially voltage was kept at the rather low value of + and - 40V. For those wishing to experiment, the supply voltage rails could be raised to + and - 50V maximum, allowing the amplifier to approach the 100W into 8 Ohm target. ..
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Usually the project is a variation on the POV toy, which you see around online all of the time as a beginner electronics project. However, we decided to deviate from our traditional path this year and create our own synthesizer kit, with an SPI DAC, Audio....
This electronic liquid detector circuit diagram is based on the ULN2429A monolithic bipolar integrated circuit designed for detecting the absence or presence of many different types of liquids. The absence or presence of the liquid is determined by comparing....
This is an improved version of the Darkroom Timer originally created by Stan Ockers (1999). Some extra features were added and the PIC code was modified accordingly The complete schematic, PCB and silkscreen are available in high resolution pdf format. The....
This micropower multifunction power management integrated circuit (PMIC) is designed using LTC3554 manufactured by Linear Technology Corporation and is a solution for portable Li-Ion Polymer battery-based applications. This micropower multifunction power....
This nifty little circuit lets you record your phone conversations automatically. The device connects to the phone line, your tape recorder`s microphone input, and the recorder`s remote control jack. It senses the voltage in the phone line and begins....
The circuit presented here makes amplitude modulation possible, and it also has the significant advantage that it replaces the somewhat exotic and quite e....
The bootloader can be used for the all USB PIC devices (PIC18F4550, PIC18F4455, PIC18F2550, PIC18F2455, PIC18F4553, PIC18F4458, PIC18F2553, PIC18F2458). Since the bootloader is designed for the Microchip demo board, the configurationof the bootloader....
circuit 1kz has an op amp component type with two inputs, output, and up and down ports, usually used for power supply rails. There`s also a buffer component type (which I think is provided by tikz itself, not the circuitikz library) which has one input and....
The CT Scanner is the abbreviation of computer tomography scanner. The invention of CT Scanner in 1970 was made possible by a previously established insight and development of the dedicated minicomputers. A high DC voltage is applied to the capacitors an....
The thermometer meter slinger circuit is composed of power supply circuit and meter slinger timing control circuit, it is shown in the figure 9-135. The power supply circuit is made of fuse FU, power supply button S(Sa, Sb), resistors R1, R2, capacitors C1,....
Here`s a design for a simple 1KHz square wave generator using a few components and the LM3909 that is useful for testing audio equipment. The circuit is based from the IC. It is powered from a single 1. 5V battery cell and the maximum amplitude of the output....
The ADUC845 MicroConverter is a fully integrated Dual 24-bit, Multi-Channel Sigma Delta ADC and Flash Microcontroller on a single chip. This device is a multi-channel extension of ADIs popular ADuC844 and ADuC846 MicroConverter family and is optimized for....
Multiplexed display suitable for LED readouts is provided by circuit using TTL counters to count 60-Hz Iine.When count reaches o`clock, flip-flop M is set on evely cycle. Gate G3 then detects when time goes to 13 o`clock, and clears shift register.Carry....
Vacuum tube electronic circuits operate from comparatively high DC voltages (150 to 600 volts). The Electric Utility supplies 120 volts AC. We have studied transformers and, therefore, we know that the 120 vAC line voltage could be stepped up to the....
servo mechanism. A feedback system that consists of a sensing element, amplifier, and servomotor, used in the automatic control....
The intercom schematic fulfills its tasks to provide a reliable communication line and is very simple to construct. The circuit is made up of an amplifier, two switches and two loudspeakers. If additional stations (speakers) are wished, additional switches....
A diode is used in series to drop the voltage down to 5. 4 V as the operating voltage for the PIC microcontroller should be below 5. 5 V. Besides, the diode also provides the protection to the circuit in case of reverse polarity of the power supply. I have....
Using this circuit, audio musical notes can be generated and heard up to a distance of 10 metres. The circuit can be divided into two parts: IR music transmitter and receiver. The IR music transmitter works off a 9V battery, while the IR music receiver works....
For an upcoming project I needed a pneumatic ram with a closed loop control system so I could position it accurately. Didn`t have the budget for an off the shelf solution, so I bodged one together with an ardunio, a couple air solenoid valves, and a pair of....
Many electronics hobbyists will have experienced the following: you try to finish a project late at night, and the mains supply fails. Whether that is caused by the electricity board or your carelessness isn`t really important. In any case, at such times you....
My major project over the last few months has been the construction of a small Tesla coil, having wanted to make one for many years now. My first experience was at a demo day at UNSW over a decade ago, and since then I`ve always had a bit of a fascination....
Looking at different ways to do current sensing, using regular opamps, rather than dedicated chips like the MAX4073T/F/H, which work well, they are just rather expensive. So while poking around i found an article written by Bob Pease, , which talks about....
The LM1036 is a DC controlled tone (bass/treble), volume and balance circuit for stereo applications in car radio, TV and audio systems. An additional control input allows loudness compensation to be simply effected. Four control inputs provide control of....
The length of time the circuit stays on for depends on how long it takes for the stored electrical current to leak back into the circuit, keeping the transistor (and thus the entire circuit) energized. We have a resistor that is limiting the rate at which....
The circuit of the Celsius thermometer in the diagram is based on the well-known Type LM334 from National Semiconductor. This IC is a sensor that provides....
The Digital-Analog-Converter fetches one of 15 parallelly pressed keyboard keys from the digital bus of the synthesizer and converts it into a control voltage (1V/Octave) and a GATE signal. The TUNE-COARSE and TUNE-FINE pots allow pitch adjustment of the....
A function generator is a signal source that has the capability of producing different types of waveforms as its output signal. The most common output waveforms are sine-waves, triangular waves, square waves, and sawtooth waves. The frequencies of such....
The L298N driver module contains the ST` L298N chip, ususlly used to drive two 3-30V DC motor, there is a 5V output interface, power for 5V single-chip circuitry, support 3. 3VMCU control. With it, you can control the DC motor easily. You can get the diagram....
This PIN diode rf switch is the ideal antenna switch for VHF and UHF and work with the PIN diodes which are special high frequency switching diodes with ve....
The ability to be able to read a 125Khz access card or keyfob at a large distance involves numerous factors including reader antenna size, radiated power, receiver sensitivity and the like. The reader cloner shown on the previous web page has the benefit of....
Figure 1-22 (a) shows the circuit which could convert 0-+lOV input voltage Ui into the pulse with 0 -1OOkHz output frequency, and pin 7 of VFC320 is connected a resistor to directly connect to standard logic. Figure 1-22 (b) shows the the circuit which could....
Create a simple (telephone based) intercom system in our new house. Shouting between rooms is not so good, and trying to use an IM client or Facetime doesn`t have the immediacy of a good shout down the corridor. I`ve got a box of old wired telephones that....
A simple audio watt meter circuit or an audio power or audio level meter circuit with diagram and schematics to measure amplifier audio output power in watts....
This infrared detector can be used to detect the presence of modulated infrared signals in its vicinity from any electronic source, for instance, an IR han....
On Halloween night, I reguarly have periods of 5, 10, and even 15 minutes where no ToTs are around. It seemed kind of silly to me to have the fogger spewing fog during such breaks by using a standard fogger timer. Instead, I decided to build my own custom....
A constant-voltage active load can perform as a battery during the charge cycle. You can set the load voltage from 5 to 35V by using potentiometer PV and thus can simulate batteries ranging from 6 to 32V. In testing a battery charger (during design or for....
The Chameleon II Power Supply Circuits take the raw input supply and provide the steady voltage supplies required by the Chamelon interfaces. The supplies are +5V, +12V and -12V...
U1 is a Complex Interface Adapter (CIA). Both parallel ports are used to decode the keyswitches on the keyboard. Parallel port A signals (PA0 - PA7) are outputs. PArallel port B signals (PB0 - PB7) are inputs. A "0" bin is shifted through the parallel port....
2012 Honda Odyssey Radio Wiring Diagram Manual PDF Download...
the RF design and construction of radio frequency oscillators...
A nice and compact setup, that works off-line, directly at 220V, with only a voltage doubler to get the plate voltage up to 560V DC. I don`t need to go into details explaining this circuit, it is a simple Armstrong oscillator, using the feedback coil L4.....
This is a low voltage microphone preamplifier circuit with a 1. 5V power supply. The reference, with a 500 kHz unity-gain bandwidth, is used as a preamplifier with a gain of 100. Its output is fed through a gain-control potentiometer to the op amp, which is....
i had a problem while designing a circuit in which BT 136TRIAC has to be triggered from a half rectified current of 30 mA at about 6V. Its not getting triggered. Even for this supply my trigger circuit is consuming power as the 4. 7k 10W resistor is getting....
A simple Solar powered battery charger, photovoltaic charger circuit can be designed using LTC4071 Li-Ion/Polymer Shunt Battery Charger System with Low Battery Disconnect. When VCC reaches the programmed float voltage (4. 1V with ADJ floating) then the....
At many situations we need to display the amount of battery charge through some kind of indication methods like LED dot display or LED bar display. Here CG comes with a battery charge indicator circuit using LED dot display. This battery power level....
The Measured Value and The Setpoint are two inputs to a Control System. The Measured Value is the Amplified input of a Transducer or Sensor for some Parameter that needs to be controlled. It could be Pressure or Temperature etc. The Setpoint is the User....
I am interested in building a solid state control for my Warn 8274 self recovery winch. The current control scheme uses 4 constant duty 200 amp solenoids. 2 switched in parallel to connect the field 1 terminal on the motor to the armature for power in, and....
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....
This circuit uses a Cmos 4017 decade counter to create a sequence of four separate events. The number of events in the sequence may be increased to nine or ten. And the length of each event is controlled independently. You`re not limited to a series of -....
An electrical circuit that ensures that when two or more generators are connected in parallel to a power system they share the load equally. In this arrangement, if the voltage of one generator is slightly higher than that of the other generator in parallel,....
It takes a 32. 768 kHz IR input and outputs a logic low when the input is present. I see 3 distinct stages. everything up to U1A, everything between U1A and Q3 and everything to the right of Q3. I follow the left and the right. but not the center which is....
Like field strength meter an RF detector circuit is also a useful project to detect a nearby RF signal. The circuit shown here can be used to detect wide band of RF frequencies and provide an alarm when it will detect an RF signal....
Prototype board for 40 pin Atmel ATMega microcontrollers with power supply circuit, 8MHz crystal oscillator circuit, RS232 port, reset IC, status LED, and 10 pin STK ICSP port.FR-4, 1.5 ....
Using a thermistor in the position shown makes a heat activated sensor. A change in temperature will alter the output of the opamp and energize the relay and light the LED. Swapping the position of the thermistor and 47k resistor makes a cold or frost alarm....
his 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 accidental activations....
If you need a typical circuit for any applications such Mobile phones, MP3 players, Portable electronics and etc using SSM2602 Low Power Audio Codec, we provide you with this SSM2602 Applications Circuit Schematic..
This is the circuit diagram of USB powered computer speaker, or it widely known as multimedia speakers for PCs. The circuit has single-chipbased design, low-voltage electrical power supply, compatibility with USB power from computer, simple....
The 555 timer IC was first introduced around 1971 by the Signetics Corporation as the SE555/NE555 and was called "The IC Time Machine" and was also the very first and only commercial timer ic available. It provided circuit designers and hobby tinkerers with....
Tutorial on Interfacing the 20x4 LCD module to PC parallel port...
This is a very simple liquid detector that use a relay to open an evacuation van. You can use it for water or any liquid that conduct electricity. Use any PNP transistor that can stand the relay current. Check out the new water level sensor circuit...
Added a BASIC preprocessor made in python that allows you to write code withought line numbers and to use labels. the preprocessor adds the lines and changes the labels to line numbers. Also made an AmericanFootball BASIC game, as an example of how to use....
That motor is rated for 6W which is 0.5 amps at 12V. I would use a 12V DC power supply rated at 1A or more. Any type will be OK. A plug-in adapter....
This circuit will detect AC line currents of about 250mA or more without making any electrical connections to the line. Current is detected by passing on of the AC lines through an inductive pickup (L1) made with a 1 inch diameter U-bolt wound with 800 turns....
This circuit in below is show the simple form of the thermometer circuit. The circuit is based on LM335 as sensing the temperature. This is the figure of the circuit. The circuit consists of two parts: The LM335 and its adjustment. The output of the LM335 is....
Designing Audio amplifier from the scratch using discrete componentsis interesting, as it allow users to design amplifiers that can satisfy their various requirements. With audio amplifiers, low level sounds from mobile devices around us can be made more....
This is a background music (SCA) decoder circuit from the input demodulated (multiplex) FM signal. We use NE565 (Phase Locked Loop IC) to be base of this....
You need not be disappointed next time when your digital camera shows low battery indication during a picnic trip. Just plug this digital camera adaptor into the cigarette lighter outlet of your car and connect the camera to it. The adaptor will interface....
Six timing positions suited to different skin types, Timing affected by sunlight intensity This timer was designed for people wanting to get tanned but at....
The circuit in the diagram is a very handy tool for rapidly checking all kinds of thyristor (SCR, triac, ). In case of a triac, all four quadrants are tested, which is done with S3, while in case of a standard thyristor, a positive power supply and trigger....
Using an MC25060V2 fan, and I`d like to switch it on and off through software occasionally (i. e. not PWM or anything fancy like that). My thought is to either put an NPN BJT or a N-channel MOSFET on the low side and control it`s gate with a 5V....
A very interesting schematic of Flip flop LED flashing circuit. The circuit actually is an astable multivibrator which starts blinking LEDs one by one when power is applied. This LED flasher circuit can be operated with any voltage from 6 to 12 volts, you....
This Line Following Robot sensor or surface scanner for robots is a very simple, stamp-sized, short range (5-10mm) Infrared proximity detector wired around....
This logic probe features either high-low (LED) indication or latching operation. When S1 closed, the indication of a pulse is latched and the red LED1 stays on. Piezoelectric buzzer BZ1 used as a beeper to sound that a logic high is preset....
Battery-Powered portable unit, Suitable for all type Televisions Using this low-cost project one can reproduce audio from TV without disturbing others. It....
A schematic diagram of a fast pulse detector is show in the figure below. Error detection rate under 10% can be expected for 60 ns pulse. To get error free....
I`ve got a button which I use as a push to talk switch. This works for the most part, however when I press the button it takes a good 5 seconds before I hear any output...
Here is our robotic project; Robotrex. A robotic dinosaur. Its name comes from the words "Robot" and "tyrosaurus-Rex". Inspired from our older projects "Bigfoot" and "the Goggles", this project was built specially for our endtas. com fair stand in 2004 Izmir....
This circuit generates a good 1KHz sinewave using the inverted Wien bridge configuration (C1-R3 & C2-R4). Features a variable output, low distortion and low output impedance in order to obtain good overload capability. A small filament lamp ensures a stable....
Previously, an article was posted on how to connect to the Raspberry PI board from a Linux PC using the serial port. We now look at how to do the same thing using a Windows PC. In this article, a Windows 8 PC is connected to the Raspberry PI through a USB to....
This is a relay circuit that detect the presence of sound to activate the relay. You can use this sound-controlled relay as voice operated switch, light...
As some of you know, the Traynor YBA-1 is a very close derivative of the classic Bassman/JTM-45 circuit. I recently picked up a spectacularly clean `67 copy that was all original with the exception of a rather "crappy" fully reversible master volume mod and....
One of the most useful gadgets a video enthusiast can have is a low-power VHF TV Transmitter. Such a device can transmit a signal from a VCR to any TV in a home or backyard. Imagine the convenience of being able to sit by the pool watching your favorite....
The supply rails prudentially voltage was kept at the rather low value of + and - 40V. For those wishing to experiment, the supply voltage rails could be raised to + and - 50V maximum, allowing the amplifier to approach the 100W into 8 Ohm target. ..
Usually the project is a variation on the POV toy, which you see around online all of the time as a beginner electronics project. However, we decided to deviate from our traditional path this year and create our own synthesizer kit, with an SPI DAC, Audio....
