New Circuits Page 178
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Atmel joins NXP, ST, Luminary Micro (now TI), and Toshiba as a microcontroller vendor to use the ARM Cortex-M3processor core. As a presumed replacement for some of their ARM 7 based MCU products, Atmel`s first Cortex-M3aims to differentiate from the rest by....
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This circuit shows both sections of an LM833 that is connected as a filter to reject undesired ultrasonic signals. The filter characteristic is 4th-order Bessel with the -3-dB frequency at about 40 kHz. Resistors and capacitors should be 1%-tolerance....
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The DC to AC inverter circuit shown in the schematic here is very simple circuit since it produce square wave, but it`s enough to power many devices. Here is the schematic diagram of the inverter circuit: The MOSFET is configured as bridge, so the current....
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Control a relay from an Arduino compatible board. When I try to activate the relay from the Arduino it takes at least a second to switch closed and sometimes does not switch closed at all. Digital pin 2 of the Arduino is connected to IN0 of this circuit....
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After some new experiments on sound analysis, I used a different design for the microphone amplifying section, that I am happy to share with you (From the statistics of Arduinoos, I know that sound capture is a topic of major interest for many of you). The....
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This amplifier can be used for practically any application that requires high power, low noise, distortion and excellent sound. Examples would be Sub-woofer amp, FOH stage amplifier, One channel of a very high-powered surround sound amplifier etc. For detail....
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Encoder and Decoder are circuits which converts the analog signal to digital and digital signal into analog signal. Its input will be in digital form while the output will be a continuous sine wave or analog wave....
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This is a small footprint 50% duty cycle square wave oscillator with variable frequency from 10kHz to 30MHz. The frequency range can be extended to 1kHz by using 1M instead of 100k for R6. The sheet presented here drives the square wave directly into 50Ohm;....
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Based on the LM733 or NE592, the preamp shown has a bandwidth of 100 MHz. The FET inputs provide about 1-M © input impedance. Q4, Q5, and IC2 provide signal conditioning. ..
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Here is calendar digital circuit. this circuit using Microcontroller is an advanced digital calendar, which displays the Date, Day, Month over the LED display. All the above systems are controlled by the Microcontroller. It has an 8 bit Microcontroller which....
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The switches and LEDs are here because they are mounted on the same front panel as the display. The "D" connetor, however, is at the rear. The two switches are momentary downwards, but latch upwards. I like to buy assortments cheaply, in this case single....
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TDA7000 is an IC for FM portable radios which has a Frequency-Locked-Loop system with an intermediate frequency of 70kHz. The TDA7000 has the following functions: RF input stage, mixer, local oscilator, IF demodulator, mute detector and mute switch. The....
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Remote control using VHF modules. A few designs for remote control switches, using VG40T and VG40R remote control pair, are shown here. The miniature transmitter module shown in Fig. 1, which...
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It has to placed making an angle of about 30 - 45 degrees to the ground. This makes the rain water to flow through it to the ground and prevents the alarm from going on due to the stored water on the sensor. The metal used to make the sensor has to be....
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In previous Instructables tutorials we have described how to make equipment used for DNA electrophoresis and imaging. These include a mini-gel electro....
-
We discussed creating a 6` tall alarm clock - authentic down to the Timex face plate. While this may sound like a silly idea to begin with, it quickly became obvious just how difficult it would be to build at that scale so the project was scuttled. Recently,....
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how do I build a circuit for digital dead out of 3 phase power consumption in home using any chip like ADE7762 ? I am interested in Polyphase Energy Metering using a....
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When ONLY VR will supply power to circuit, then MCU again will get power from +5V bus, but FTDI will ONLY get VCCIO. On middle of voltage divider R10/R11 I expect there will be 0 and MCU will not detect USB connection on (B). The question is - would it work....
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This is a project of a simple metal detector circuit. The circuit is easy to build using only one transistor and few other components. The circuit is a colpitts oscillator which boradcast on AM band. Take a good quality am receiver and place it near this....
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The 555 frequency can be varied via adjusting the voltage at pin 5. However, the range and linearity of frequency adjustment is very limited. This is a way....
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Measuring the radiation can be made not only with expensive factory-made instrument. The simplest device (see Figure 1), can be build if you have a counter (radiation detector) type SBM-20 or similar. The circuit is powered by a 220 volts AC 50/60Hz. The....
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This is a circuit for a tone control using 3 band equalizers. This circuit is based on single chip op amps LF351. This circuit having three ranges, bass, middle and treble controls. This is the figure of the circuit; With a single chip op amps LF351, it is....
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This is simple a led flasher circuit that I would link to suggest you make it.But before you can use transistors,which difficulty when we learn about digital....
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yeah, you really need some current limiting. i use open frame linear supplies for charging batteries, and set the current limit at the recommended charging current of the battery (foldback current limiting is very useful), but then again, i have a few of....
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I designed this project for another boy who had a much bigger box of electronic scrap than me so he supplied most of the bits for it. I made it in few evenings besides doing my homework. We wanted it to play a bit of a tune so we looked through the Maplin....
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A multiple automatic brightness control for a television receiver including a first automatic brightness limiter (ABL) circuit responsive only to relatively long duration changes in brightness-producing current and a second ABL circuit responsive to....
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This discussion continues on from the audio tone control topic, which introduced both passive and active tone controls. The follow on topics might be a 2-Band Active Tone Control, or the 3-Band Active Tone Control. An audio equalizer is used to adjust the....
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This is a real time clock by using 89c51 micro-controller, clock`s data format is hour:min:sec, and it is displayed on 16x2 LCD, the code has been tested and compilled on Keil uVision compiler, circuit diagram for the project is shown below...
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The currents listed are maximum values, the actual current used will vary on what the circuits are doing. That precludes just placing a resistor in series to drop 12 to 9 volts and run the units. Note that on each circuit there is a 1N4007 diode in series....
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Sometimes you have to do it the hard way, even if doing it the easy way is an option. That is the case here. The intention is to add a second doorbell in parallel with the existing bell. This does not, in principle, require any electronic components. You....
-
This circuit functions with inaudible (ultrasonic) sound. Sound of frequency up to 20 kHz is audible to human beings. The sound of frequency above 20 kHz is called ultrasonic sound. The circuit described generates (transmits) ultrasonic sound of frequency....
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This LM350 Car battery charger circuit project is a high performance charger that quickly charges gelled lead-acid batteries and turns off the charger process at full charge. This LM350 Car battery charger circuit will provide a charge current of 2A when the....
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These accessories are low cost, aerial speed, bifold JFET ascribe operational amplifiers with an internally akin ascribe account voltage (BI-FET II technology). They crave low accumulation accepted yet advance a ample accretion bandage amplitude artefact and....
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This little project was inspired by the Availabot from Schulze and Webb ( ). The Availabot is a puppet guy that rises to its feet when a friend comes online on IM, and falls over when the friend disappears. It`s a cool little toy, but it has 3 shortcomings:....
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This is a great audio amplifier circuit based on single power IC TDA7294. TDA7294 is intended for use as a high quality audio class AB amplifier in hi-fi applications. It has very low noise ..
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I`m building a tube/MOSFET hybrid power amplifier based on a circuit in AudioXpress by Cozza (5/01) which in turn is based on a design by Borbely....
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Assortment of Siren Circuits. This month I am making 3 different types of siren circuits based on the 555 timer. The first circuit simulates the siren of a British police car. It uses two...
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On the DMX line side a XLR connector should be used. Either a 5 or 3 pin connector. The pins/holes in a XLR connector are usually numbered so no need for a picture. For the 5 pin connector, only pins 1-3 are used. I used the following code to do some initial....
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Crystals with higher frequencies than about 30 MHz are almost exclusively overtone crystals. Such a crystal is intended to be used on an odd multiple of it`s fundamental frequency. Unfortunately, the crystal doesn`t want to resonate on it`s overtone....
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Intro & disclaimer For all you guys out there that want a fading dome light (aka courtesy light aka theatre lighting) without having to pay for....
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A 24V DC power supply circuit using LM7824 IC. LM7824 is a 24V 1. 5A fixed output voltage regulator IC, available in TO 220 package. It is an IC of LM78xx series, this series contains many fixed output voltage ICs like LM7815 is designed for fixed 15V output....
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The circuit diagram is shown to the right. You can get a larger version or a PostScript version if you prefer. The design is based around a Microchip PIC16F628A microcontroller. At the time of writing, this device is available for less than one pound from....
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Here is a simple circuit to protect your Telephone, EPBAX, Telephone Modem etc from lightning discharge or line spikes. It uses a safety capacitor and Gas....
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Performing a chip conversion for the Sparkfun LED RingCoder. The sample code provided with the product works well on an Arduino UNO, but it uses a pin for each I/O - 5 pins for the shift registers and 6 pins for the RGB rotary encoder. What I want to do is....
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See as the figure, the controller consists of liquid level, trigger controller and step-down rectifier circuit, etc. The water level detecting poles of a, b and c compose the bias circuit as the water level detector with W1, R1, R2 and R3. When the water....
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This circuit uses just two CMOS IC`s, a 4011 quad 2 input NAND gate, and a 4020 14-stage ripple binary counter. At switch on R2 and C2 provide a brief reset pulse, which will ensure the output pin Q1 of the 4020 is high. Gates U1 and U2 form a simple astable....
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This accurate one-pulse-per-second clock is made with a few common parts and driven from a 50 or 60 Hertz mains supply but with no direct connection to it. A beep or metronome-like click and/or a visible flash, will beat the one-second time and can be useful....
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A radio controlled electronic flash is a useful item in any photographers kit. Professionals use them all the time. For example, a wedding photographer would put one behind the bride to back-light her gown and veil. You dont want wires showing in a shot like....
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This is a design schematic Class A power amplifier. This is a close as possible in operating parameter the Under Classes is class B, to aid comparison ; in particular the NFB factor remains 30dB at 20 kHz. The front end is similiar to class B amplifier. This....
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In today`s world Personality Power, everyone wants to have a magnetic personality. It`s just the best way to get what you want and who doesn`t want to get what they want? You need to know how to have a magnetic personality and you need to know NOW!....
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The following circuit shows about LM358 IC Solar Controller Circuit Diagram. Features: also as a mobile communications base stations, convert ....
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This interface became a standard to almost all operating systems we know today. IDEfile is a ProFile compatible hard drive for Apple /// and Lisa systems. Emulation of the classic 5MB ProFile and the rare ProFile 10M is provided. I intend to support....
-
-
This simple 12VDC to 220VAC inverter circuit produces an AC output at line frequency and voltage. The 555 is configured as a low-frequency oscillator, tunable over the frequency range of 50 to 60 Hz by Frequency potentiometer R4. The 555 feeds its output....
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This is a take off from the previously posted bicycle anti-theft alarm. One commenter indicated a desire to adapt it to a threshold step plate vibration de....
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Evolution FM transmitter with 2n2218 with audio amplification step using LM741 op amp with audio input for MP3, MP4, mobile, computer and other audio sources, beyond the traditional electret microphone. With great sensitivity to the input signal. Using fewer....
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The LCD display on my NAD C520 compact disk player has become unreadable. The audio and CD deck are operating fine but operating the unit without a legible displayis difficult. If you look at the LCD under the right external lighting you can see that the....
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SO HERE YOU CAN SEE THAT USING ENCODER 4-BIT DATA ISGENERATED AND THIS DATA WILL MODULATED USING RFMODULATE AND TRANSMITTED. ANOTHER SIDE RECEIVER RECEIVES SIGNAL AND DEMODULATE THAN DECODER DECODES THE SIGNAL AND 4-BIT DATA ISAVAILABLE. HERE IS THE PIN....
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The adjustment control for the contrast of an LC-Display is typically a 10-k potentiometer. This works fine, provided that the power supply voltage is constant. If this is not the case (for example, with a battery power supply) then the potentiometer has to....
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Diode and capacitor can be used to clamp an AC signal, shift the level into positive region for all cycle. Sometimes this condition is needed, to have positive....
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The losses in a bridge rectifier can easily become significant when low voltages are being rectified. The voltage drop across the bridge is a good 1. 5 V, which is a hefty 25% with an input voltage of 6V. The loss can be reduced by around 50% by using....
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This is a compact electronic siren circuit based on three transistors. This circuit is suitable for in corporating with other alarm or siren projects such as burglar alarms, automatic factory sirens etc or a simple push to on alarm. The electronic siren....
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Circuit Here is a circuit of a remote control unit which makes use of the radio frequency signals to control various electrical appliances. This remote control unit has 4 channels which can be easily extended to 12. This circuit differs from similar circuits....
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The line is purposefully not straight, to see how it would do with zig-zags and splits, as are normal for the Chibots advanced line-following contest. The AVRcam is a small, real-time image processing engine capable of tracking colorful objects. The system....
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741 opamp is connected as audio oscillator with Radio Shack 276-677 photocells in feedback circuits. When light strikes PC1, its resistance decreases and frequency of audio tone in headphone decreases correspondingly. When light strikes PC2, which is....
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For control a small DC motor, like the one in a tape recorder. Q1 and Q2 are in saturation when both the points A & B are `HIGH`. Component: ....
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To do this, I want to push a button to initiate the timer, which will then light 3 x leds. After each 5 minute segment is up, one of the LEDs should go out. Finally, when 15 mins is up, I want to ring a bell (just once) using a solenoid. Trouble is - I don`t....
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VFC62 voltage / frequency,frequency / voltage converter can easily convert analog signals into digital signals.The digital output uses the form of open collector,digital pulse repetition rate is proportional to the amplitude of the input analog voltage,the....
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This is a basic single-zone burglar alarm circuit. Its features include automatic Exit and Entry delays - and an optional Siren Cut-Off timer. It has an extremely small standby current. This makes it ideal for battery-powered operation. Use it in your....
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This project uses an LM3915 bar-graph IC driving two sets of ten LEDs for a 30dB range. The circuit is unique because it has an additional range of 20dB provided by an automatic gain control to allow it to be very sensitive to low sound levels but it....
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Here is an ultra simple automatic light switch circuit for bedrooms. After construction,connect the input terminals of this circuit in parallel to the internal buzzer terminals of a Quartz-Alarm Clock. When the clock alarm is activated at a....
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The LED is 3V, and according "to the internet" (there was no manufactorer info on it) a blue LED usually supports up to 0. 03A. Since I have spare current from the USB I thought I should build a parallel circuit. Now, the last class on circuits I had was on....
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At some time, you`ve probably run into this magical instrument in the lab - the function generator. Just turn the waveform selector knob and a triangle, square or sine wave appears at the output! Turn another knob and the frequency of the signal changes. Now....
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A FET impedance converter for use with the Fishman pickup on my Kay orchestra bass. As shown in the schematic below, the circuit is divided into two sections, so that the input section can be mounted inside the head shell of a 1/4" plug. This puts the active....
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In this lab we will be using flip-flops. Xilinx offers a large library of sequential circuits. Make sure to check it out when searching for circuits: Xilinx Refernce Library. The circuit we want to implement in this lab is a sequential circuit controlling 3....
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This is aquiz bell/alarm circuit. This circuit indicate fastest finger first . This circuit has one bulb for Quiz master and one for each contestant. The bulb will illuminate when a button is pressed. the cathode of the 9v1 zener sees approx mid-rail....
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This audio limiter circuit is easy to build, works with BA741 8pins or 4pins so pay attention and uses a symmetrical power supply. When the audio input lev...
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In order to start the timining you have 2 possibilities: you either connect the START point to ground GND and in this case the timer starts when you connect it to the voltage supply or you can place a switch to start it...
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PC based candle ignitor is a pc based verified project for computer student using 555 lighting candle using computer circuit diagram with software code in C ...
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This simple DC servo motor circuit design that can be used in various electronic projects. As you can see in the circuit schematic this Dc servo motor driver schematic circuit use just one integrated circuit and other few external electronic components. With....
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Here we show you how to hack a TV-B-Gone into the case of a vintage television remote control, such that the original on/off button instead activates the TV-B-Gone. We also modify the power supply so that it runs off of a regular 9 V battery, instead of a....
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Hello. I`m trying to make an oscillator that would run from 200V range, providing about 1 kHz with minimal current drain. I started with making a test ....
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The Electronics Schematic Diagram MJR7-Mk3 Mosfet MJR6 page includes distortion extracted using the nulling method with a speaker load and a music signal to demonstrate that these designs have no audible distortion in normal use. The MJR7 has even lower....
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Atmel joins NXP, ST, Luminary Micro (now TI), and Toshiba as a microcontroller vendor to use the ARM Cortex-M3processor core. As a presumed replacement for some of their ARM 7 based MCU products, Atmel`s first Cortex-M3aims to differentiate from the rest by....
This circuit shows both sections of an LM833 that is connected as a filter to reject undesired ultrasonic signals. The filter characteristic is 4th-order Bessel with the -3-dB frequency at about 40 kHz. Resistors and capacitors should be 1%-tolerance....
The DC to AC inverter circuit shown in the schematic here is very simple circuit since it produce square wave, but it`s enough to power many devices. Here is the schematic diagram of the inverter circuit: The MOSFET is configured as bridge, so the current....
Control a relay from an Arduino compatible board. When I try to activate the relay from the Arduino it takes at least a second to switch closed and sometimes does not switch closed at all. Digital pin 2 of the Arduino is connected to IN0 of this circuit....
After some new experiments on sound analysis, I used a different design for the microphone amplifying section, that I am happy to share with you (From the statistics of Arduinoos, I know that sound capture is a topic of major interest for many of you). The....
This amplifier can be used for practically any application that requires high power, low noise, distortion and excellent sound. Examples would be Sub-woofer amp, FOH stage amplifier, One channel of a very high-powered surround sound amplifier etc. For detail....
Encoder and Decoder are circuits which converts the analog signal to digital and digital signal into analog signal. Its input will be in digital form while the output will be a continuous sine wave or analog wave....
This is a small footprint 50% duty cycle square wave oscillator with variable frequency from 10kHz to 30MHz. The frequency range can be extended to 1kHz by using 1M instead of 100k for R6. The sheet presented here drives the square wave directly into 50Ohm;....
Based on the LM733 or NE592, the preamp shown has a bandwidth of 100 MHz. The FET inputs provide about 1-M © input impedance. Q4, Q5, and IC2 provide signal conditioning. ..
Here is calendar digital circuit. this circuit using Microcontroller is an advanced digital calendar, which displays the Date, Day, Month over the LED display. All the above systems are controlled by the Microcontroller. It has an 8 bit Microcontroller which....
The switches and LEDs are here because they are mounted on the same front panel as the display. The "D" connetor, however, is at the rear. The two switches are momentary downwards, but latch upwards. I like to buy assortments cheaply, in this case single....
TDA7000 is an IC for FM portable radios which has a Frequency-Locked-Loop system with an intermediate frequency of 70kHz. The TDA7000 has the following functions: RF input stage, mixer, local oscilator, IF demodulator, mute detector and mute switch. The....
Remote control using VHF modules. A few designs for remote control switches, using VG40T and VG40R remote control pair, are shown here. The miniature transmitter module shown in Fig. 1, which...
It has to placed making an angle of about 30 - 45 degrees to the ground. This makes the rain water to flow through it to the ground and prevents the alarm from going on due to the stored water on the sensor. The metal used to make the sensor has to be....
In previous Instructables tutorials we have described how to make equipment used for DNA electrophoresis and imaging. These include a mini-gel electro....
We discussed creating a 6` tall alarm clock - authentic down to the Timex face plate. While this may sound like a silly idea to begin with, it quickly became obvious just how difficult it would be to build at that scale so the project was scuttled. Recently,....
how do I build a circuit for digital dead out of 3 phase power consumption in home using any chip like ADE7762 ? I am interested in Polyphase Energy Metering using a....
When ONLY VR will supply power to circuit, then MCU again will get power from +5V bus, but FTDI will ONLY get VCCIO. On middle of voltage divider R10/R11 I expect there will be 0 and MCU will not detect USB connection on (B). The question is - would it work....
This is a project of a simple metal detector circuit. The circuit is easy to build using only one transistor and few other components. The circuit is a colpitts oscillator which boradcast on AM band. Take a good quality am receiver and place it near this....
The 555 frequency can be varied via adjusting the voltage at pin 5. However, the range and linearity of frequency adjustment is very limited. This is a way....
Measuring the radiation can be made not only with expensive factory-made instrument. The simplest device (see Figure 1), can be build if you have a counter (radiation detector) type SBM-20 or similar. The circuit is powered by a 220 volts AC 50/60Hz. The....
This is a circuit for a tone control using 3 band equalizers. This circuit is based on single chip op amps LF351. This circuit having three ranges, bass, middle and treble controls. This is the figure of the circuit; With a single chip op amps LF351, it is....
This is simple a led flasher circuit that I would link to suggest you make it.But before you can use transistors,which difficulty when we learn about digital....
yeah, you really need some current limiting. i use open frame linear supplies for charging batteries, and set the current limit at the recommended charging current of the battery (foldback current limiting is very useful), but then again, i have a few of....
I designed this project for another boy who had a much bigger box of electronic scrap than me so he supplied most of the bits for it. I made it in few evenings besides doing my homework. We wanted it to play a bit of a tune so we looked through the Maplin....
A multiple automatic brightness control for a television receiver including a first automatic brightness limiter (ABL) circuit responsive only to relatively long duration changes in brightness-producing current and a second ABL circuit responsive to....
This discussion continues on from the audio tone control topic, which introduced both passive and active tone controls. The follow on topics might be a 2-Band Active Tone Control, or the 3-Band Active Tone Control. An audio equalizer is used to adjust the....
This is a real time clock by using 89c51 micro-controller, clock`s data format is hour:min:sec, and it is displayed on 16x2 LCD, the code has been tested and compilled on Keil uVision compiler, circuit diagram for the project is shown below...
The currents listed are maximum values, the actual current used will vary on what the circuits are doing. That precludes just placing a resistor in series to drop 12 to 9 volts and run the units. Note that on each circuit there is a 1N4007 diode in series....
Sometimes you have to do it the hard way, even if doing it the easy way is an option. That is the case here. The intention is to add a second doorbell in parallel with the existing bell. This does not, in principle, require any electronic components. You....
This circuit functions with inaudible (ultrasonic) sound. Sound of frequency up to 20 kHz is audible to human beings. The sound of frequency above 20 kHz is called ultrasonic sound. The circuit described generates (transmits) ultrasonic sound of frequency....
This LM350 Car battery charger circuit project is a high performance charger that quickly charges gelled lead-acid batteries and turns off the charger process at full charge. This LM350 Car battery charger circuit will provide a charge current of 2A when the....
These accessories are low cost, aerial speed, bifold JFET ascribe operational amplifiers with an internally akin ascribe account voltage (BI-FET II technology). They crave low accumulation accepted yet advance a ample accretion bandage amplitude artefact and....
This little project was inspired by the Availabot from Schulze and Webb ( ). The Availabot is a puppet guy that rises to its feet when a friend comes online on IM, and falls over when the friend disappears. It`s a cool little toy, but it has 3 shortcomings:....
This is a great audio amplifier circuit based on single power IC TDA7294. TDA7294 is intended for use as a high quality audio class AB amplifier in hi-fi applications. It has very low noise ..
I`m building a tube/MOSFET hybrid power amplifier based on a circuit in AudioXpress by Cozza (5/01) which in turn is based on a design by Borbely....
Assortment of Siren Circuits. This month I am making 3 different types of siren circuits based on the 555 timer. The first circuit simulates the siren of a British police car. It uses two...
On the DMX line side a XLR connector should be used. Either a 5 or 3 pin connector. The pins/holes in a XLR connector are usually numbered so no need for a picture. For the 5 pin connector, only pins 1-3 are used. I used the following code to do some initial....
Crystals with higher frequencies than about 30 MHz are almost exclusively overtone crystals. Such a crystal is intended to be used on an odd multiple of it`s fundamental frequency. Unfortunately, the crystal doesn`t want to resonate on it`s overtone....
Intro & disclaimer For all you guys out there that want a fading dome light (aka courtesy light aka theatre lighting) without having to pay for....
A 24V DC power supply circuit using LM7824 IC. LM7824 is a 24V 1. 5A fixed output voltage regulator IC, available in TO 220 package. It is an IC of LM78xx series, this series contains many fixed output voltage ICs like LM7815 is designed for fixed 15V output....
The circuit diagram is shown to the right. You can get a larger version or a PostScript version if you prefer. The design is based around a Microchip PIC16F628A microcontroller. At the time of writing, this device is available for less than one pound from....
Here is a simple circuit to protect your Telephone, EPBAX, Telephone Modem etc from lightning discharge or line spikes. It uses a safety capacitor and Gas....
Performing a chip conversion for the Sparkfun LED RingCoder. The sample code provided with the product works well on an Arduino UNO, but it uses a pin for each I/O - 5 pins for the shift registers and 6 pins for the RGB rotary encoder. What I want to do is....
See as the figure, the controller consists of liquid level, trigger controller and step-down rectifier circuit, etc. The water level detecting poles of a, b and c compose the bias circuit as the water level detector with W1, R1, R2 and R3. When the water....
This circuit uses just two CMOS IC`s, a 4011 quad 2 input NAND gate, and a 4020 14-stage ripple binary counter. At switch on R2 and C2 provide a brief reset pulse, which will ensure the output pin Q1 of the 4020 is high. Gates U1 and U2 form a simple astable....
This accurate one-pulse-per-second clock is made with a few common parts and driven from a 50 or 60 Hertz mains supply but with no direct connection to it. A beep or metronome-like click and/or a visible flash, will beat the one-second time and can be useful....
A radio controlled electronic flash is a useful item in any photographers kit. Professionals use them all the time. For example, a wedding photographer would put one behind the bride to back-light her gown and veil. You dont want wires showing in a shot like....
This is a design schematic Class A power amplifier. This is a close as possible in operating parameter the Under Classes is class B, to aid comparison ; in particular the NFB factor remains 30dB at 20 kHz. The front end is similiar to class B amplifier. This....
In today`s world Personality Power, everyone wants to have a magnetic personality. It`s just the best way to get what you want and who doesn`t want to get what they want? You need to know how to have a magnetic personality and you need to know NOW!....
The following circuit shows about LM358 IC Solar Controller Circuit Diagram. Features: also as a mobile communications base stations, convert ....
This interface became a standard to almost all operating systems we know today. IDEfile is a ProFile compatible hard drive for Apple /// and Lisa systems. Emulation of the classic 5MB ProFile and the rare ProFile 10M is provided. I intend to support....
This simple 12VDC to 220VAC inverter circuit produces an AC output at line frequency and voltage. The 555 is configured as a low-frequency oscillator, tunable over the frequency range of 50 to 60 Hz by Frequency potentiometer R4. The 555 feeds its output....
This is a take off from the previously posted bicycle anti-theft alarm. One commenter indicated a desire to adapt it to a threshold step plate vibration de....
Evolution FM transmitter with 2n2218 with audio amplification step using LM741 op amp with audio input for MP3, MP4, mobile, computer and other audio sources, beyond the traditional electret microphone. With great sensitivity to the input signal. Using fewer....
The LCD display on my NAD C520 compact disk player has become unreadable. The audio and CD deck are operating fine but operating the unit without a legible displayis difficult. If you look at the LCD under the right external lighting you can see that the....
SO HERE YOU CAN SEE THAT USING ENCODER 4-BIT DATA ISGENERATED AND THIS DATA WILL MODULATED USING RFMODULATE AND TRANSMITTED. ANOTHER SIDE RECEIVER RECEIVES SIGNAL AND DEMODULATE THAN DECODER DECODES THE SIGNAL AND 4-BIT DATA ISAVAILABLE. HERE IS THE PIN....
The adjustment control for the contrast of an LC-Display is typically a 10-k potentiometer. This works fine, provided that the power supply voltage is constant. If this is not the case (for example, with a battery power supply) then the potentiometer has to....
Diode and capacitor can be used to clamp an AC signal, shift the level into positive region for all cycle. Sometimes this condition is needed, to have positive....
The losses in a bridge rectifier can easily become significant when low voltages are being rectified. The voltage drop across the bridge is a good 1. 5 V, which is a hefty 25% with an input voltage of 6V. The loss can be reduced by around 50% by using....
This is a compact electronic siren circuit based on three transistors. This circuit is suitable for in corporating with other alarm or siren projects such as burglar alarms, automatic factory sirens etc or a simple push to on alarm. The electronic siren....
Circuit Here is a circuit of a remote control unit which makes use of the radio frequency signals to control various electrical appliances. This remote control unit has 4 channels which can be easily extended to 12. This circuit differs from similar circuits....
The line is purposefully not straight, to see how it would do with zig-zags and splits, as are normal for the Chibots advanced line-following contest. The AVRcam is a small, real-time image processing engine capable of tracking colorful objects. The system....
741 opamp is connected as audio oscillator with Radio Shack 276-677 photocells in feedback circuits. When light strikes PC1, its resistance decreases and frequency of audio tone in headphone decreases correspondingly. When light strikes PC2, which is....
For control a small DC motor, like the one in a tape recorder. Q1 and Q2 are in saturation when both the points A & B are `HIGH`. Component: ....
To do this, I want to push a button to initiate the timer, which will then light 3 x leds. After each 5 minute segment is up, one of the LEDs should go out. Finally, when 15 mins is up, I want to ring a bell (just once) using a solenoid. Trouble is - I don`t....
VFC62 voltage / frequency,frequency / voltage converter can easily convert analog signals into digital signals.The digital output uses the form of open collector,digital pulse repetition rate is proportional to the amplitude of the input analog voltage,the....
This is a basic single-zone burglar alarm circuit. Its features include automatic Exit and Entry delays - and an optional Siren Cut-Off timer. It has an extremely small standby current. This makes it ideal for battery-powered operation. Use it in your....
This project uses an LM3915 bar-graph IC driving two sets of ten LEDs for a 30dB range. The circuit is unique because it has an additional range of 20dB provided by an automatic gain control to allow it to be very sensitive to low sound levels but it....
Here is an ultra simple automatic light switch circuit for bedrooms. After construction,connect the input terminals of this circuit in parallel to the internal buzzer terminals of a Quartz-Alarm Clock. When the clock alarm is activated at a....
The LED is 3V, and according "to the internet" (there was no manufactorer info on it) a blue LED usually supports up to 0. 03A. Since I have spare current from the USB I thought I should build a parallel circuit. Now, the last class on circuits I had was on....
At some time, you`ve probably run into this magical instrument in the lab - the function generator. Just turn the waveform selector knob and a triangle, square or sine wave appears at the output! Turn another knob and the frequency of the signal changes. Now....
A FET impedance converter for use with the Fishman pickup on my Kay orchestra bass. As shown in the schematic below, the circuit is divided into two sections, so that the input section can be mounted inside the head shell of a 1/4" plug. This puts the active....
In this lab we will be using flip-flops. Xilinx offers a large library of sequential circuits. Make sure to check it out when searching for circuits: Xilinx Refernce Library. The circuit we want to implement in this lab is a sequential circuit controlling 3....
This is aquiz bell/alarm circuit. This circuit indicate fastest finger first . This circuit has one bulb for Quiz master and one for each contestant. The bulb will illuminate when a button is pressed. the cathode of the 9v1 zener sees approx mid-rail....
This audio limiter circuit is easy to build, works with BA741 8pins or 4pins so pay attention and uses a symmetrical power supply. When the audio input lev...
In order to start the timining you have 2 possibilities: you either connect the START point to ground GND and in this case the timer starts when you connect it to the voltage supply or you can place a switch to start it...
PC based candle ignitor is a pc based verified project for computer student using 555 lighting candle using computer circuit diagram with software code in C ...
This simple DC servo motor circuit design that can be used in various electronic projects. As you can see in the circuit schematic this Dc servo motor driver schematic circuit use just one integrated circuit and other few external electronic components. With....
Here we show you how to hack a TV-B-Gone into the case of a vintage television remote control, such that the original on/off button instead activates the TV-B-Gone. We also modify the power supply so that it runs off of a regular 9 V battery, instead of a....
Hello. I`m trying to make an oscillator that would run from 200V range, providing about 1 kHz with minimal current drain. I started with making a test ....
The Electronics Schematic Diagram MJR7-Mk3 Mosfet MJR6 page includes distortion extracted using the nulling method with a speaker load and a music signal to demonstrate that these designs have no audible distortion in normal use. The MJR7 has even lower....
