New Circuits Page 181
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The Wien-Bridge oscillator fulfills these requirements because there is a low pass filter, a high pass filter and a 180 deg. phase shift from the feedback networks from the input to output. This totals 360 deg. to start the circuit oscillating. If all three....
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This circuit of measurement of level uses the UAA180 of SIEMENS and a circuit of rectification of precision, round the IC2B. The calibration has become in steps 3db from the one Led in the other, ensuring, a very good rate of precision, in the measurement of....
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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 cu....
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This circuit is used to sense the insertion of a penny. Before the penny is inserted, current is flowing through the detector (transistor) side of the optointerruptor, and Port M5 is HI. When the penny blocks the optointerruptor, Port M5 goes low. The hex....
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It has an audio transformer. I`m still attempting to grasp the concept of impedance and such, so can someone explain why this is necessary And how would such a transformer even work to change the impedance What would be the difference if you didn`t use an....
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A powerful buzzer in the room, combined with a pushbutton at the bottom of the stairs or in the kitchen, could be very handy in such situations. The heart of this circuit is formed by IC1, a TDA2030. This IC has built-in thermal protection, so it`s not....
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This circuit is another radio frequency (rf) field strength meter, similar with our previous field strength meter circuit, but with lower supply voltage (only a single cell 1. 5V battery). Here is the schematic diagram of this rf strength meter circuit: To....
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Inductors can be mimicked quite easily using operational amplifiers. The circuit shown here was developed to have an inductance of 1000 H (say, one thousand Henry) with good damping. Using this design you can build a resonant circuit with a center frequency....
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The RF module, as the name suggests, operates at Radio Frequency. The corresponding frequency range varies between 30 kHz & 300 GHz. In this RF system, the digital data is represented as variations in the amplitude of carrier wave. This kind of modulation is....
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Dear Susan, your amp is similar to this one which has even a lower parts number. It deserves to be built!....
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This circuit provides a visual 9 second delay using a 7 segment digital readout LED. When the switch is closed, the CD4010 up/down counter is preset to 9 and the 555 timer is disabled with the output held high. When the switch is opened, the timer produces....
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To see how RFM12B wireless compares to other similar wireless options (e. g Xbee, XRF etc. ) check out this well compiled comparison overview byStuart Poulton:. 3 different ISM band frequencies: 433MHz (worldwide), 868MHz (Europe), 915MHz (USA & Australia....
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The circuit uses the long-wave wireless transceiver T630/T631, controlled 6-channel load. The features are low-power, high anti-interference ability and simple structure etc....
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Here is a simple RF bug detector that will help you detect spy bugs and can operate up to 2 GHz. Below are some essential things required for this circuit:....
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That`s a great idea to use the chips internal reference and some resistance to get the right bias on the audio; it would really reduce the parts count ..
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I done some more playing with the LTspice simulation of Dxvideo`s preamp-with-DC-Servo circuit. I have been using the .four command to have spice....
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Hi-fi 100W mosfet power amplifier circuit . Operates from 45v dual supply. 100W to 8 ohm speaker, 160W to 4 ohm speaker, low distortion....
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Personal Alarm Circuit Diagram. If you feel threatened or need an urgent support in a crowd, use this alarm to catch the attention of others ..
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This Audio Mixer mixes multiple audio inputs to a single audio output, with knobs to control the volume of each channel. My particular build features....
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One PIC to act as a keypad driver though plus some primitive stuff to tie them together (when the time runs out disable the keypad and beep, when the correct button is pressed increment the score counter and regenerate). The random number generator is really....
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KIA6924S is designed for muting the popping sound made at power of ON-OFF receivers, pre-amplifiers, main Amplifiers and other electric Audio equipment as well as the noise made at changeover of switches. By Korea Electronics (KEC) ..
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With the Control "On the PCB", set at these Positions* CX = CW Center CCW 100 pf = 6, 400 hz 12, 050 hz 26, 000 hz 470 pf = 1, 525 hz 3, 200 hz 7, 232 hz. 001 uf = 681 hz 1, 425 hz 3, 250 hz. 0022 uf = 348 hz 619 hz 1, 540 hz. 01 uf = 69 hz 146 hz 340 hz.....
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This smart doorbell system is designed for use in industrial environments. It is microcontroller based and controls a horn and a flash light....
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And here is the final part of the entry, starting with the schematic that I finally used. The core is the same as before. But now there is a linear voltage regulator for the controller. Also shown here is the serial interface and most importantly, the sensor....
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This small video transmitter is very usefull for video surveillance on short distances ( up to 100m ) equipped with a black and white or infrared camera mo...
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Colpitts oscillators are somewhat similar to the shunt fed Hartley circuit except the Colpitts oscillator, instead of having a tapped inductor, utilises two series capacitors in its LC circuit. With the Colpitts oscillator the connection between these two....
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This is a simple sawtooth generator circuit. The advantages of this circuit are low cost and produces an auxiliary square wave at the same frequency. This circuit can be used to sweep the frequency of another generator. Here is the circuit : A....
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This page contains GIF images of the circuit diagram for the Solution interface, the PCB artwork, the board layout, a typical side elevation of the assembly, a parts list, some hints and a little about troubleshooting. This is a self-extracting 2. 5MB file;....
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I/O board adds 16-bit resolution Volt Analog inputs, 16-bit resolution volt analog outputs, and 4-20mA current loop transmitter and receiver to microcontroller. Amplifier circuits and schematics are discussed. Signal conditioning variable gain amplifier,....
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TDA7294 is a monolithic integrated circuit in Multiwatt15 package, with high output power (up to 100W) intended for use as audio class AB amplifier in Hi-F....
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Oscillator circuit is an electronic circuit that produce a periodic signal. The term quadrature refers to a fourth (1/4) phase shift of full wave cycle (1/4 of....
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Im looking for a Light timer/ dimmer Like something you would find on a Dome light. but dont know where to start ..
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Work of the circuit The circuit consists of low-frequency oscillator, the electronic switch circuit, control circuit, photoelectric display circuit and music alarm circuit. (It is showed in picture 7-113.) Low-frequency oscillator consists of IC lCl (Dl-D4)....
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This is the circuit that I designed for this project. To power this project, I am using a 6V 400 mA DC power supply. Its open-circuit voltage (no load....
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Tug Of War is a game that I made on an FPGA. The digital circuit was created using Verilog. It is a FSM (Finite State Machine)...
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This circuit indicates the remaining battery life bAy varying the duty cycle and flash rate of an LED as the battery voltage decreases. In fact, the circuit actually indicates five battery conditions: (1) a steady glow assures indicates that the battery is....
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Using an Atmega8-8PU (configured for 8MHz with external crystal), a Nokia 5110 lcd, and a transistor to handle the pulses from a reed relay. A 3. 3V regulator provides the voltage for the entire circuit. Everything has been mounted on a test board, including....
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The circuit will provide a 20 ±0. 1 dB voltage gain from 500 kHz to 50 MHz. The low-frequency response of the amplifter can be extended by increasing the value of the 0. 05- F capacitor connected in series with the input terminal. This circuit will yield an....
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The circuit consists of channel quad amplifier (LM3900). mic audio inputs and direct line inputs are circuit. By adding circuit parallel with this, increase of inputs the applications. input is connected to the inverting terminal of LM3900. The amplifier of....
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The terminal of R7 bearing an arrow must be connected to the desired output pin of IC2 or IC3 in order to select the number of LEDs or clusters forming the bar. For example: if you want to drive seven LEDs or clusters connect R7 to pin#11 of IC2 (Output 8)....
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The wiring diagram for the clock and radio screen illumination for a 1999 mercury sable with a 3. 0L vin U. I have searched for hours on alldata and MichellOnDemand and have found absolutely nothing. Please help! I don`t know if it matters, but the vehicle....
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It is possible to implement a PoE Plus-required power level of 30 W, with the aid of an external MOSFET and a controller designed for the older standard....
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find sections such LM5020 Connection Diagram and pin descriptions, the functional block diagram of the device, line Under Voltage Lock Out (UVLO) circuit, an internal high gain error amplifier, a cycle-by-cycle over current protection function, sets the....
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The original coil that came with the Heathkit project was preassembled at the factory. It had a diameter of around 15cm (6 inch). A larger (30cm, 12inch) coil can be made using the following data:..
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Hey all I`m new to both the forums and electronics. Recently I chanced upon a Laser Alarm System and decided to give it a go....
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-
MRFICl505R2 is a 1. 575GHz GPS downconverter chip. It integrates mixer, VCO, PLL, crystal oscillator, A / D converter and loop filter and other circuits. MRFICl505R2 IF output frequency is 4. 1MHz; it has 105dB typical conversion gain, 2. 7V operating....
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In order to accomplish this my initial thought is to sample an input (ADC) at consistant time increments and then display the waveform on a graphic lcd display. If I want to change the time scale I can just change the rate of time between samples, and if I....
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This thermometer uses an LM19 sensor calibrated for measuring a wide temperature range (-55 130 Celsius, -67 266 Fahrenheit) for outdoor temperature measurement and an SHT21 digital thermometer with humidity measurement for indoor use. An ATmega328....
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The circuit is simple, yet is capable of excellent performance. I designed it specifically for use as an amplifier for the digital sound card in my computer. Audio input can be from any two-channel line level device such as a television, CD player, or VCR.....
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The circuit diagram of Automatic head lights turn off circuit has been explained here. This circuit can be installed in a car...
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-
This toggle circuit operates by using a couple 555 timers wired as inverters. Pins 2 and 6 are the threshold and trigger inputs to the first timer and pin 5 is the output. The output at pin 5 will always be the inverse of the input at pins 2 and 6. Likewise,....
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for example i dont get the way the demodulation is done or the modulation itself an so on please is someone able to understand this circuit could you give me a hand..
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A power supply project without using a power supply. This can save the expense of buying a transformer, but presents potentially lethal voltages at the output terminals. Under no circumstances should a beginner attempt to build such a project. Electric Shock....
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The main purpose of this design was to obviate a small defect of the very popular Fridge Door Alarm circuit, available on this website since 1999 and built by a lot of hobbyists. Unfortunately, that circuit stops operating when the battery voltage falls....
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Circuit consists of an oscillator with variable frequency, a divided frequency and measurement stage. The Oscillator is based on a inversor from a 74HC14 and generates a frequency f inversely proportional to the Cx placed between terminals. During a half....
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The ADC Tester (A2100) is a LWDAQ device that records the output and power consumption of two ADC s. Its original purpose was comparative testing of two ADCs at different temperatures, but it turned out that the A2100 makes a good dual-channel eighteen-bit....
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To my new bestest pals: Anyone with experience on the old Uni`s? Model 1221. Looking to switch her to el34`s from 6l6`s. Not the savviest in the tuber....
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This project implements a network connected water level sensor, measuring the level in the sump pit of my house. It`s connected to the home network and reports the water level by broadcasting UDP packets so that any computer can receive it and take action,....
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This is a simple temperature measurement probe circuit. This circuit measures temperature either on a PC board or at the probe tip to which contains the....
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The following circuit shows about Cat And Dog Repellent Timer Circuit Diagram. Features: high output ultrasonic transmitter, uses a standard 555 ....
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The absence of compensation simplifies development and testing. The number 6 billion turns up often as the number of cell phones in use worldwide. Published estimates average....
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The ckt is built around two 555 timer ICs. U1 and U2. U1 is wired as a variable duty cycle oscillator with a constant time period of around 0.1 second. Duty cycle can be varied from 0 to 100 per cent by R4 potentiometer. The output of U1 (pin 3) is connected....
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The schematic for this project has been kept super simple with very few parts keeping the total cost very low and assembly time low. The main parts in the schematic are the PIC 18F452, Tilt Sensor and LED Bar. The power regulation circuit is in the lower....
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There are some digital and analog that can be used for compensating a PT100 RTD nonlinearity. We can implemented the digital linearization by implementing the...
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The metal detector circuit shown here must represent the limits of simplicity for a metal detector, yet the design works surprisingly well. It uses just one 40106 hex Schmitt inverter IC, a capacitor and a search coil and of course the batteries. A lead from....
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This circuit is a small +5V power supply, which is useful when experimenting with digital electronics. Small inexpensive wall tranformers with variable output voltage are available from any electronics shop and supermarket. Those transformers are easily....
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Many a times one needs an extra telephone ringer in an ad joining room to know if there is an incoming call. For example, if the telephone is installed in the drawing room you may need an extra ringer in the bedroom. All that needs to be done is to connect....
-
flip flop A bistable multivibrator. A circuit which has two output states and is switched from one to the other by means....
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The figure shows an easy project / schematic of a metronome. A metronome is a device that is used by musicians. The circuit produces continues beats in the speaker....
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Ordinary LED flashers turn the LED on and off abruptly, which can get a little irritating after a while. The circuit shown here is more gentle on the eyes....
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The project explains how to make simple AVR High Voltage Programmer using Arduino. It can be used to fix/recovery wrong fused AVR chip....
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This cheap frequency meter circuit that we show to you. Suitable for general use in small laboratories. Because cheap, easy to build. And Qualified enough. For applications most of the electronics amateur. It can be shown that the frequency read directly....
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The goal of such a machine (called an electrocardiograph, or ECG ) is to amplify, measure, and record the natural electrical potential created by the heart. Note that cardiac electrical signals are different than heart sounds, which are listened to with a....
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This plugin uses a quartz oscillator which uses a crystal (X1), amongst other components to give a 32, 768Hz (32, 768=215) output. This is input to a 4020 14-Stage Ripple Counter, which divides this signal down by 214 to a 2Hz signal. This 2Hz signal is then....
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This circuit is using Power Battery Terminal (PBT) for easy relay output and aux power connection. The LED on each channel indicates relay status. Berg pins for connecting power and trigger voltage...
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Modifying the MXR Micro Amp for True Bypass switching, requiring tricky circuit board surgery due to its original surface-mount DPDT switch....
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There is little to be said about this circuit. All the work is done by the regulator. The 7809 can deliver up to 2 amps continuous output whilst maintaining a low noise and very well regulated supply. The circuit will work without the extra components, but....
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Can be used agains ferocious animals or attackers, BUT REMEMBER, this device may be illegal in your state..
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This circuit uses the 555 timer in an Astable operating mode which generates a continuous output via Pin 3 in the form of a square wave. This turns the LED (D1) on and off. The speed at which the LED (D1) is turned on and off is set by the values of R1 and R2...
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The NP-100v12 is a simple headphone amplifier that allows an entry level builder to experience assembling and listening to their own creation. I use the term builder as electronic experience combined with innovation which allows the creation of a device,....
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The timer is triggered on the zero crossing voltage pulse. The time constant is determined by C5/R14+R15 that is used to determine the conduction angle. The T2 T3 inhibits the power switch until the auxiliary supply voltage reaches 8V to guarantee that the....
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A lot of my projects involve 120VAC, switching relatively slowly. Most people use mechanical relays in that situation, but I don`t like them; I try to avoid moving parts whenever possible. Up to this point, I`ve always used solid state relays. They work....
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This includes a 220uF capacitor and two diodes to slow down the switch-on to reduce the output thump as the output capacitor charges through the speaker. This is not essential, depending on speaker sensitivity, with my own speakers there is just an....
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This is a spectacular but completely useless project. It lights Ultra-Bright LEDs in a sequence and each LED flashes brightly very briefly. The LEDs light-up going around and around since they are mounted in a circle (on a CD), then they pause before chasing....
The Wien-Bridge oscillator fulfills these requirements because there is a low pass filter, a high pass filter and a 180 deg. phase shift from the feedback networks from the input to output. This totals 360 deg. to start the circuit oscillating. If all three....
This circuit of measurement of level uses the UAA180 of SIEMENS and a circuit of rectification of precision, round the IC2B. The calibration has become in steps 3db from the one Led in the other, ensuring, a very good rate of precision, in the measurement of....
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 cu....
This circuit is used to sense the insertion of a penny. Before the penny is inserted, current is flowing through the detector (transistor) side of the optointerruptor, and Port M5 is HI. When the penny blocks the optointerruptor, Port M5 goes low. The hex....
It has an audio transformer. I`m still attempting to grasp the concept of impedance and such, so can someone explain why this is necessary And how would such a transformer even work to change the impedance What would be the difference if you didn`t use an....
A powerful buzzer in the room, combined with a pushbutton at the bottom of the stairs or in the kitchen, could be very handy in such situations. The heart of this circuit is formed by IC1, a TDA2030. This IC has built-in thermal protection, so it`s not....
This circuit is another radio frequency (rf) field strength meter, similar with our previous field strength meter circuit, but with lower supply voltage (only a single cell 1. 5V battery). Here is the schematic diagram of this rf strength meter circuit: To....
Inductors can be mimicked quite easily using operational amplifiers. The circuit shown here was developed to have an inductance of 1000 H (say, one thousand Henry) with good damping. Using this design you can build a resonant circuit with a center frequency....
The RF module, as the name suggests, operates at Radio Frequency. The corresponding frequency range varies between 30 kHz & 300 GHz. In this RF system, the digital data is represented as variations in the amplitude of carrier wave. This kind of modulation is....
Dear Susan, your amp is similar to this one which has even a lower parts number. It deserves to be built!....
This circuit provides a visual 9 second delay using a 7 segment digital readout LED. When the switch is closed, the CD4010 up/down counter is preset to 9 and the 555 timer is disabled with the output held high. When the switch is opened, the timer produces....
To see how RFM12B wireless compares to other similar wireless options (e. g Xbee, XRF etc. ) check out this well compiled comparison overview byStuart Poulton:. 3 different ISM band frequencies: 433MHz (worldwide), 868MHz (Europe), 915MHz (USA & Australia....
The circuit uses the long-wave wireless transceiver T630/T631, controlled 6-channel load. The features are low-power, high anti-interference ability and simple structure etc....
Here is a simple RF bug detector that will help you detect spy bugs and can operate up to 2 GHz. Below are some essential things required for this circuit:....
That`s a great idea to use the chips internal reference and some resistance to get the right bias on the audio; it would really reduce the parts count ..
I done some more playing with the LTspice simulation of Dxvideo`s preamp-with-DC-Servo circuit. I have been using the .four command to have spice....
Hi-fi 100W mosfet power amplifier circuit . Operates from 45v dual supply. 100W to 8 ohm speaker, 160W to 4 ohm speaker, low distortion....
Personal Alarm Circuit Diagram. If you feel threatened or need an urgent support in a crowd, use this alarm to catch the attention of others ..
This Audio Mixer mixes multiple audio inputs to a single audio output, with knobs to control the volume of each channel. My particular build features....
One PIC to act as a keypad driver though plus some primitive stuff to tie them together (when the time runs out disable the keypad and beep, when the correct button is pressed increment the score counter and regenerate). The random number generator is really....
KIA6924S is designed for muting the popping sound made at power of ON-OFF receivers, pre-amplifiers, main Amplifiers and other electric Audio equipment as well as the noise made at changeover of switches. By Korea Electronics (KEC) ..
With the Control "On the PCB", set at these Positions* CX = CW Center CCW 100 pf = 6, 400 hz 12, 050 hz 26, 000 hz 470 pf = 1, 525 hz 3, 200 hz 7, 232 hz. 001 uf = 681 hz 1, 425 hz 3, 250 hz. 0022 uf = 348 hz 619 hz 1, 540 hz. 01 uf = 69 hz 146 hz 340 hz.....
This smart doorbell system is designed for use in industrial environments. It is microcontroller based and controls a horn and a flash light....
And here is the final part of the entry, starting with the schematic that I finally used. The core is the same as before. But now there is a linear voltage regulator for the controller. Also shown here is the serial interface and most importantly, the sensor....
This small video transmitter is very usefull for video surveillance on short distances ( up to 100m ) equipped with a black and white or infrared camera mo...
Colpitts oscillators are somewhat similar to the shunt fed Hartley circuit except the Colpitts oscillator, instead of having a tapped inductor, utilises two series capacitors in its LC circuit. With the Colpitts oscillator the connection between these two....
This is a simple sawtooth generator circuit. The advantages of this circuit are low cost and produces an auxiliary square wave at the same frequency. This circuit can be used to sweep the frequency of another generator. Here is the circuit : A....
This page contains GIF images of the circuit diagram for the Solution interface, the PCB artwork, the board layout, a typical side elevation of the assembly, a parts list, some hints and a little about troubleshooting. This is a self-extracting 2. 5MB file;....
I/O board adds 16-bit resolution Volt Analog inputs, 16-bit resolution volt analog outputs, and 4-20mA current loop transmitter and receiver to microcontroller. Amplifier circuits and schematics are discussed. Signal conditioning variable gain amplifier,....
TDA7294 is a monolithic integrated circuit in Multiwatt15 package, with high output power (up to 100W) intended for use as audio class AB amplifier in Hi-F....
Oscillator circuit is an electronic circuit that produce a periodic signal. The term quadrature refers to a fourth (1/4) phase shift of full wave cycle (1/4 of....
Im looking for a Light timer/ dimmer Like something you would find on a Dome light. but dont know where to start ..
Work of the circuit The circuit consists of low-frequency oscillator, the electronic switch circuit, control circuit, photoelectric display circuit and music alarm circuit. (It is showed in picture 7-113.) Low-frequency oscillator consists of IC lCl (Dl-D4)....
This is the circuit that I designed for this project. To power this project, I am using a 6V 400 mA DC power supply. Its open-circuit voltage (no load....
Tug Of War is a game that I made on an FPGA. The digital circuit was created using Verilog. It is a FSM (Finite State Machine)...
This circuit indicates the remaining battery life bAy varying the duty cycle and flash rate of an LED as the battery voltage decreases. In fact, the circuit actually indicates five battery conditions: (1) a steady glow assures indicates that the battery is....
Using an Atmega8-8PU (configured for 8MHz with external crystal), a Nokia 5110 lcd, and a transistor to handle the pulses from a reed relay. A 3. 3V regulator provides the voltage for the entire circuit. Everything has been mounted on a test board, including....
The circuit will provide a 20 ±0. 1 dB voltage gain from 500 kHz to 50 MHz. The low-frequency response of the amplifter can be extended by increasing the value of the 0. 05- F capacitor connected in series with the input terminal. This circuit will yield an....
The circuit consists of channel quad amplifier (LM3900). mic audio inputs and direct line inputs are circuit. By adding circuit parallel with this, increase of inputs the applications. input is connected to the inverting terminal of LM3900. The amplifier of....
The terminal of R7 bearing an arrow must be connected to the desired output pin of IC2 or IC3 in order to select the number of LEDs or clusters forming the bar. For example: if you want to drive seven LEDs or clusters connect R7 to pin#11 of IC2 (Output 8)....
The wiring diagram for the clock and radio screen illumination for a 1999 mercury sable with a 3. 0L vin U. I have searched for hours on alldata and MichellOnDemand and have found absolutely nothing. Please help! I don`t know if it matters, but the vehicle....
It is possible to implement a PoE Plus-required power level of 30 W, with the aid of an external MOSFET and a controller designed for the older standard....
find sections such LM5020 Connection Diagram and pin descriptions, the functional block diagram of the device, line Under Voltage Lock Out (UVLO) circuit, an internal high gain error amplifier, a cycle-by-cycle over current protection function, sets the....
The original coil that came with the Heathkit project was preassembled at the factory. It had a diameter of around 15cm (6 inch). A larger (30cm, 12inch) coil can be made using the following data:..
Hey all I`m new to both the forums and electronics. Recently I chanced upon a Laser Alarm System and decided to give it a go....
MRFICl505R2 is a 1. 575GHz GPS downconverter chip. It integrates mixer, VCO, PLL, crystal oscillator, A / D converter and loop filter and other circuits. MRFICl505R2 IF output frequency is 4. 1MHz; it has 105dB typical conversion gain, 2. 7V operating....
In order to accomplish this my initial thought is to sample an input (ADC) at consistant time increments and then display the waveform on a graphic lcd display. If I want to change the time scale I can just change the rate of time between samples, and if I....
This thermometer uses an LM19 sensor calibrated for measuring a wide temperature range (-55 130 Celsius, -67 266 Fahrenheit) for outdoor temperature measurement and an SHT21 digital thermometer with humidity measurement for indoor use. An ATmega328....
The circuit is simple, yet is capable of excellent performance. I designed it specifically for use as an amplifier for the digital sound card in my computer. Audio input can be from any two-channel line level device such as a television, CD player, or VCR.....
The circuit diagram of Automatic head lights turn off circuit has been explained here. This circuit can be installed in a car...
This toggle circuit operates by using a couple 555 timers wired as inverters. Pins 2 and 6 are the threshold and trigger inputs to the first timer and pin 5 is the output. The output at pin 5 will always be the inverse of the input at pins 2 and 6. Likewise,....
for example i dont get the way the demodulation is done or the modulation itself an so on please is someone able to understand this circuit could you give me a hand..
A power supply project without using a power supply. This can save the expense of buying a transformer, but presents potentially lethal voltages at the output terminals. Under no circumstances should a beginner attempt to build such a project. Electric Shock....
The main purpose of this design was to obviate a small defect of the very popular Fridge Door Alarm circuit, available on this website since 1999 and built by a lot of hobbyists. Unfortunately, that circuit stops operating when the battery voltage falls....
Circuit consists of an oscillator with variable frequency, a divided frequency and measurement stage. The Oscillator is based on a inversor from a 74HC14 and generates a frequency f inversely proportional to the Cx placed between terminals. During a half....
The ADC Tester (A2100) is a LWDAQ device that records the output and power consumption of two ADC s. Its original purpose was comparative testing of two ADCs at different temperatures, but it turned out that the A2100 makes a good dual-channel eighteen-bit....
To my new bestest pals: Anyone with experience on the old Uni`s? Model 1221. Looking to switch her to el34`s from 6l6`s. Not the savviest in the tuber....
This project implements a network connected water level sensor, measuring the level in the sump pit of my house. It`s connected to the home network and reports the water level by broadcasting UDP packets so that any computer can receive it and take action,....
This is a simple temperature measurement probe circuit. This circuit measures temperature either on a PC board or at the probe tip to which contains the....
The following circuit shows about Cat And Dog Repellent Timer Circuit Diagram. Features: high output ultrasonic transmitter, uses a standard 555 ....
The absence of compensation simplifies development and testing. The number 6 billion turns up often as the number of cell phones in use worldwide. Published estimates average....
The ckt is built around two 555 timer ICs. U1 and U2. U1 is wired as a variable duty cycle oscillator with a constant time period of around 0.1 second. Duty cycle can be varied from 0 to 100 per cent by R4 potentiometer. The output of U1 (pin 3) is connected....
The schematic for this project has been kept super simple with very few parts keeping the total cost very low and assembly time low. The main parts in the schematic are the PIC 18F452, Tilt Sensor and LED Bar. The power regulation circuit is in the lower....
There are some digital and analog that can be used for compensating a PT100 RTD nonlinearity. We can implemented the digital linearization by implementing the...
The metal detector circuit shown here must represent the limits of simplicity for a metal detector, yet the design works surprisingly well. It uses just one 40106 hex Schmitt inverter IC, a capacitor and a search coil and of course the batteries. A lead from....
This circuit is a small +5V power supply, which is useful when experimenting with digital electronics. Small inexpensive wall tranformers with variable output voltage are available from any electronics shop and supermarket. Those transformers are easily....
Many a times one needs an extra telephone ringer in an ad joining room to know if there is an incoming call. For example, if the telephone is installed in the drawing room you may need an extra ringer in the bedroom. All that needs to be done is to connect....
flip flop A bistable multivibrator. A circuit which has two output states and is switched from one to the other by means....
The figure shows an easy project / schematic of a metronome. A metronome is a device that is used by musicians. The circuit produces continues beats in the speaker....
Ordinary LED flashers turn the LED on and off abruptly, which can get a little irritating after a while. The circuit shown here is more gentle on the eyes....
The project explains how to make simple AVR High Voltage Programmer using Arduino. It can be used to fix/recovery wrong fused AVR chip....
This cheap frequency meter circuit that we show to you. Suitable for general use in small laboratories. Because cheap, easy to build. And Qualified enough. For applications most of the electronics amateur. It can be shown that the frequency read directly....
The goal of such a machine (called an electrocardiograph, or ECG ) is to amplify, measure, and record the natural electrical potential created by the heart. Note that cardiac electrical signals are different than heart sounds, which are listened to with a....
This plugin uses a quartz oscillator which uses a crystal (X1), amongst other components to give a 32, 768Hz (32, 768=215) output. This is input to a 4020 14-Stage Ripple Counter, which divides this signal down by 214 to a 2Hz signal. This 2Hz signal is then....
This circuit is using Power Battery Terminal (PBT) for easy relay output and aux power connection. The LED on each channel indicates relay status. Berg pins for connecting power and trigger voltage...
Modifying the MXR Micro Amp for True Bypass switching, requiring tricky circuit board surgery due to its original surface-mount DPDT switch....
There is little to be said about this circuit. All the work is done by the regulator. The 7809 can deliver up to 2 amps continuous output whilst maintaining a low noise and very well regulated supply. The circuit will work without the extra components, but....
Can be used agains ferocious animals or attackers, BUT REMEMBER, this device may be illegal in your state..
This circuit uses the 555 timer in an Astable operating mode which generates a continuous output via Pin 3 in the form of a square wave. This turns the LED (D1) on and off. The speed at which the LED (D1) is turned on and off is set by the values of R1 and R2...
The NP-100v12 is a simple headphone amplifier that allows an entry level builder to experience assembling and listening to their own creation. I use the term builder as electronic experience combined with innovation which allows the creation of a device,....
A lot of my projects involve 120VAC, switching relatively slowly. Most people use mechanical relays in that situation, but I don`t like them; I try to avoid moving parts whenever possible. Up to this point, I`ve always used solid state relays. They work....
This includes a 220uF capacitor and two diodes to slow down the switch-on to reduce the output thump as the output capacitor charges through the speaker. This is not essential, depending on speaker sensitivity, with my own speakers there is just an....
This is a spectacular but completely useless project. It lights Ultra-Bright LEDs in a sequence and each LED flashes brightly very briefly. The LEDs light-up going around and around since they are mounted in a circle (on a CD), then they pause before chasing....
