Popular Circuits Page 155
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Electronics Tutorial about Passive High Pass Filter Circuit including Passive RC High Pass Filter First Order Frequency Response, Bode Plot and Construction....
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This is an intermediate to advanced project and I do not recommend it as a first project if you are just getting started in synths or electronics. Only the circuit and some explanation are shown here. A lot of project building, troubleshooting and....
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As shown in FIG weak light alarm circuit. The core of the oscillator circuit for the alarm SCZ07. Its input signal by the potentiometer W, control, output signal photoresistor ..
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The SciSys Leonardo and Saitek Galileo and Renaissance chess computers could be connected to a PC via an OSA-Link cable. Such a cable is needed to run the OSA-4-Arena software and other tools. Unfortunately that cable is no longer available. Special....
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This simple water detector circuit uses alternative voltage in order to prevent the corrosion of the electrodes. It is easy to build and uses N1 as a trigger Schmitt gate which generate the AC. If between the electrodes is a electricity conductor, for....
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Using MAX1576Y charge pump white LED driver circuit as shown, the circuit is capable of driving up to 480mA total current two groups (n = 4 white LED) white LED...
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This is a design circuit for tone control circuit. This is the figure of the circuit;..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 in ....
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This is a very simple design for a phantom supply. This design will work with microphones that have no problem with the phantom supply being only 15V. It also has to be noted that, at high SPL, distortion can become intolerable (totally depending on....
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A logarithmic resistor ladder is an electronic circuit composed of a series of resistors and switches, designed to create an attenuation from an input to an output signal, where the logarithm of the attenuation ratio is proportional to a digital code word....
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his circuit can be used as an Infrared beam barrier as well as a proximity detector.
The circuit uses the very popular Sharp IR module (Vishay module can also be used). The pin nos. shown in the circuit are for the Sharp & VIshay modules. For other modules....
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Micro-Cap 9 is an integrated schematic editor and mixed analog/digital simulator that provides an interactive sketch and simulate environment for electronics engineers. Since its original release in 1982, Micro-Cap has been steadily expanded and improved.....
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The DVM-to-temperature adapter is built around a single IC, National"s LMlO. That micropower IC contains a stable 0.2 V reference, a reference amplifier and a general-purpose op amp. The circuit is designed for a linear temperature range of 0 to 100°C (32....
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To start old Optrex DMC50264N LCD module you need to get +24V LCD bias voltage Where to get it if you have only low voltage 3 5V As LCD module drains very low current, it is possible to build very small DC/DC converter. There are lots of chips designed for....
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The cool thing about the 4017 is that you can add other 4017s and make the sequence longer (of course with more discrete parts): I saw the schematic youG ‚¬ re talking about. Oddly, this was one of the only 4017 cascading schematics I could find. I found....
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When the current through the load exceeds a level determined by the position of the wiper on the 1k wire-wound pot, this circuit cuts off the load immediately. If S1 is open, the range is approximately 300-650 mA, and 0.8-2A when it is closed. The key....
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As Moore`s Law plunges us into the realm of multigigahertz processors and PCs with gigabytes of RAM, engineers face the task of removing the heat that these state-of-the-art components produce. Cooling such systems poses a dilemma. If you optimize the fan....
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The project I present here is my attempt at a universal QRP T/R switch. The idea is to take care of the essentials, so that any QRP (i. e. , less than 10W) receiver *AND* CW transmitter can be connected, and work seamlessly. These are what I considered the....
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The essential principles of mixing audio signals are straightforward, but strangely are not explained very well at all on the Net. This article should fill the gaps....
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With many audio systems consisting of separate units, you`ll oftennd that due to economic reasons only the amplifier has a remote control receiver module. The control signals are then sent to the other units using patch cables. The tuner and CD player, for....
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A very efficient buck boost converter circuit is shown here. The circuit is based on the LTC3440 buck boost regulator IC from Linear Technology. The LTC3440 requires only one inductor and provides up to 96% efficiency. There is no need of Schottky diode for....
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Dual drive ICs 10LED level meter circuit Dual-drive IC is shown in the IO LED level meter circuit, the figure of two TLM8101 driver IC can also be used instead. ..
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With a CD4060 shown below production time controller circuit connected instantly, guaranteed by R5, C3 constitute a differential circuit delay time from scratch. Under the action of the oscillating signal,..
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This siren provides a constant audio output, but alternates between two separate tones. The LM13080 is set to oscillate at one basic frequency; ..
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In order to display polar quantities (magnitude and direction of a received radio signal), a sine and cosine voltage proportional to an angle (antenna direction) is needed. In this case, a sine-cosine potentiometer coupled to a directional antenna and a....
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This page provides links to software and hardware designs contributed by Handy Board users. If you would like to contribute some work of your own to the Handy Board community, please contact Fred Martin. Thanks! George Musser contributed an adaptation of....
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Transistor Q1 acts as an amplifier for condenser microphone MIC1. The output of Q1 is applied to the base of transistor Q2 through a 4. 7 -I"F capacitor. C2 and 11 form an LC tank circuit. which is used to set the frequency at which the transmitter....
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The following circuit shows about Light Barrier Sensor Detector Circuit Diagram. Features: single transistor, The potentiometer is adjusted, 6V ....
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Power amplifier circuit diagram using the IC TLE2141C. This is TLE2141C IC IC type Low noise, high voltage, high-slew-rate op-amps. Frequency response 30Hz...
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What's so special about this circuit? Well, the first third-brake light I installed I had to pull a wire from the
Third Brake Light all the way underneath the carpet to the brake-pedal-switch and I thought it would be easier to
pluck the signal of both....
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Doubling rectifier circuit in negative ion generator application circuit ..
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The two diodes will be fried. You`ll want some series resistors for them. If the simulation runs, the current through the diodes will be huge. jippie Apr 30 `13 at 9:40 @jippie Both diodes need not be fried :-) One will become a SED (Smoke Emitting Diode),....
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* Flashing frequency can be varied by changing R1 value in the 1M - 4M7 range.
* This circuit is very efficient when driving a small 3.2V incandescent lamp. In this case omit the LED and R3, connecting the bulb across Q2 Collector and positive supply,....
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This circuit takes advantage of the voltage drop across bridge rectifier diodes to produce a 5-position variable voltage supply to a DC fan or other small DC motor. It is not as efficient as a switch-mode circuit but it has the virtues of simplicity and no....
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a programmable clock timer circuit that uses individual LEDs to indicate hours and minutes. 12 LEDs can be arranged in a circle to represent the 12 hours of a clock face and an additional 12 LEDs can be arranged in an outer circle to indicate 5 minute....
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@ goldsmith If you need a complete circuit , i have thousands of these circuits in my designs . i can give you some of them easily , but you have told ....
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This is a circuit that produces constant current constant voltage SMPS. To efficiently charge a battery, we can use constant current constant voltage SMPS....
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Battery deep discharge would plate curing, shortening the battery life. This could be set discharge protection device. Circuit is shown. When the battery voltage drops to the t..
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With this unique logic-power-converter design (see the figure), a switchable 3.6 or 5 V at 200 inA can be attained by using four AA cells. The supply incorporates a MOSFET switch that can switch to a lithium backup battery, providing a 3.4-V output when the....
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This circuit shows a solid-state fluorescent-lamp starter that uses a SIDAC. In this circuit, the ballast is identical to that used with a conventional glow-tube starter. ..
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Output-clamp diodes are mandatory because loudspeakers are inductive loads. Output LR isolation is also used because audio amplifiers are usually expected to handle up to 2 mF load capacitance. Large, supply-bypass capacitors located close to the IC are used....
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This page describes how to build this full-bandwidth single-port (one input and one output) MIDI interface. The interface is buffered (that is, if the PC gets behind you won`t lose data) and it works in Windows 3.1 and Windows 95 using a special (and very....
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Here we demonstrate the use of an Arduino PWM output pin to generate sound. The output pin can be toggled very quickly from LOW to HIGH generating a square wave. If the frequency of this square wave is within the range of 20-20, 00Hz and sent directly into a....
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The voltage requirement the Solidus is desirous of is quite a bit higher than your circuit provides I know Chris. It was....
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Three new linear regulators simplify the design of batteryoperated
equipment. The LT®1521 is a 300mA, positive
low dropout regulator with micropower quiescent current
and shutdown. The LT1175 is a 500mA negative complement
with adjustable current limit.....
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Microdot - wrist watch LED pattern timepiece Another RGB Sunset Productions production! This project is a circuit board for making a wrist watch size versi....
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A relaxation oscillator is used to flash an LED in the base circuit. Cl is charged slowly through R1 by the power source, then discharged periodically through R3 and the LED by the UJT.
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Diode D1 and resistor R1 provide the VDD isolation when programming the 24 pin devices. The jumper J3 must be shorted for 24 pin devices, and open circuit for 28 pin device programming. Following EEPROMs are pin compatible with their EPROMs version, ..
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The FT8U232AM requires a small number of external components to produce a device that converts USB to TTL level RS232 signals. All you need to add is a TTL to RS232 converter to provide the 12V RS232 logic levels. The FT8U232AM and supporting components is....
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Dimming control circuit as shown in FIG. Single-chip I/O port sinking method to achieve control thyristor switch and dimming control. MOC3041 optocoupler with internal zero-cro..
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Doing a project on GSM. In that i want to detect the key pressed at the other side on active call. I am trying with a dtmf decoder circuit at speaker output but it is not working. Plz if any one has any other idea or solution plz reply...
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This subwoofer filter set Suitable for use with a great car audio system. Since this circuit is designed to operate with a 12 volt DC power. But if you....
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Tired of always spending money on flashlight batteries only to have them fail just when you need them? Try this simple circuit out. It would make an excellent science fair project. The white LEDs are quite bright, they provide enough light to illuminate a....
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Auto Repair Question Answered for Jeep Grand Cherokee Brake Light Woes...
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This project has an impossible requirement or uses parts that are no longer available. It is here for reference or inspiration only. Consider it unsupported . This project displays telephone numbers decoded from tones. Specifically, telephone touchtones.....
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Using modulated rectangular waves of different time periods, the circuit presented here produces ringing tones similar to those produced by a telephone. The circuit requires four astable multivibrators for its working. Therefore two 556 ICs are used here.....
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Circuit of a loop sensor based simple security alarm is described here. The sensor loop is nothing but a short length of thin enamelled copper wire, which....
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Clip-on current probe, such as the Tektronix P6021 current waveform for oscilloscope display is very useful. Unfortunately, for the low-frequency response is always some limita..
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overhead detector (fire alarm) circuit is a precision integrated temperature sensor type LM35 (IC1), which provides an accurately linear and ....
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You ll find that this is a very easy project to build. It will transmit good quality sound in the FM band ( 88 108 mhz ). One inportant item is that the....
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This 3 volts Car Adapter circuit is based on a standard LT1074CT switching regulator IC. The schematic shows the LT1074CT used as a positive step-down or ‘....
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Automotive electronic code lock circuit is shown as above. ICl is exclusive lock for the integrated circuit 5G058, its ? ~ ? feet connect external key switch to the power supply. They are six valid input keys. The unlock must follow the sequence of Sl ~ S6;....
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Circuit order is triggered by the positive edge. The anode of the triac switches are turned on, the cathode of the switches are closed. Male - female IN4009 positive transient ..
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The following are current regulator circuits that can be used to drive light emitting diodes. As always, take time to do some testing before attempting to use these circuits in actual applications...
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A correct grounding is very important to eliminate hum and ground loops. Connect to the same point the ground sides of J1, P1, C2, C3 & C4. Connect C6 to the output ground. An audio amplifier is an electronic amplifier that amplifies low-power audio signals....
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The input stage is the most critical for common-mode rejection and noise. We used a Burr-Brown INA121 differential amplifier, set to a gain of 10. The input stage is DC coupled. With a 9-volt supply, a differential DC offset of up to about a volt is....
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This 40W fluorescent lamp inverter allows you to run 40W fluorescent tubes from any 12V source capable of delivering 3A. This is basically a larger version of the 12VDC Fluorescent Lamp Driver and can be used to light regular or blacklight tubes. # Wind....
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White LEDs have a rated current at a voltage drop of about 3.3 to 3.4 V. It is ideal to be powered from the battery voltage which is slightly larger. Then there is the best energy used. In this I used a flashlight battery, Li-ion battery, which lasts the....
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The LED flasher circuits below operate on a single 1.5 volt battery. The circuit on the upper right uses the popular LM3909 LED flasher IC and requires only a timing capacitor and LED. The top left circuit, designed by Andre De-Guerin illustrates using a....
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Senses heart pulse by means of an infrared earlobe clip. Reverse engineered circuit diagram of heart pulse sensor circuit board out of a treadmill. Notice that the output is level shifted for use by CMOS logic running on 4.5V regulated down from the 6V....
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Having your Arduino control higher-power devices like lights, motors, pumps, doors, and many more is one of the most interesting and useful applications you may get involved with. But it can be a little difficult and possibly dangerous when power line....
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This project was on my list for a while. The main reason was that the winch on the Jeep is permanently connected to the battery. So every nut job in a parking lot could just stick a paper clip into the winch remote and play with the winch, or worse, shorten....
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The working and block diagram of IC 723 Voltage Regulators is given with Circuit Diagram, and Applications,....
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Light emitting diodes are advan- tageous due to their smaller size, low current consumption and catchy colours they emit. Here is a running message display circuit wherein the letters formed by LED arrangement light up progressively. Once all the letters of....
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BGl, BG2 composition directly coupled amplifier, BG, BG4 is composed of monostable trigger circuit, without receiving prior to the trigger signal, BG3 saturated conduction, BG4..
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A, B, c became indirect person capacitance Figure l-230 new access capacitor C is called the bootstrap capacitor. Self bootstrap capacitor can increase the voltage at point A. ..
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This 8 function serial Christmas lamp controller is based on the IC UTC 8156 from Unisonic. Specially designed for the same purpose, the UTC 8156 can control the four lamps in 8 modes namely waves, sequential, slo-gol, chasing/flash, slow fade,....
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Brush 6 channel camera power supply circuit (MAX1566-1567) 6 shows a digital camera channel power supply circuit (MAX1566/1567), known by the ring, PWM generation circuit provi..
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The Tritium circuit was the first (to my knowledge) type 3 SE. As such, it is quite experimental, and should be regarded as a prototype rather than the `state of the art`! Nevertheless, it does function reasonably well, and in some circumstances outperforms....
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One-IC two-tones Siren. Double-tone Police sound. Single-tone old ambulance sound. Circuit diagram: Parts: R1,R3 470K 1/4W Resistors R2 680K 1/4W...
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This 1000 watt power inverter circuit diagram based on MOSFET RF50N06. If you want more power then add additional MOSFET paralleled at RF50N06. This MOSFETS are 60 Volts and 50 Amps as rated. It is necessary to connect a FUSE with the power line and always a....
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O The SA1021 integrated Radio receiver circuit is for portable Radios stereo as well as mono, where a minimum of periphery is important in terms of small dimensions and low cost. It is fully compatible for applications using the low-voltage micro tuning....
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This revision reduced the signal level and
treble response in the preamp for a smoother
sound in both cathode and fixed bias modes.
The power supply was also revised for lower
B+ voltages to the EL84 plates. "This amp was built on the chassis of an....
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Make your own Guitar Effects Pedal with an Arduino board. Bit crushing, rate reducing, weird noises. 10-bit effects/guitar pedal with an Arduino for lo-fi DSP..
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Large Dancing Robot Build a large dancing robot. This was supposed to be a walking robot, but it more kinda beebopped around. video on last step. Build a P....
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The goal is to take photos of some fairly quick process (well, at least too quick for the human eye) at exactly specified times with sub-millisecond accuracy. Of couse, with expensive special equipment at hand (such as a high speed camera), this is a trivial....
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his Design Idea describes a virtual instrument that uses a desktop or notebook computer with an analog data-acquisition card and National Instruments` (www.ni.com) LabView software (Version 7.1 or above). In operation, the software extracts B-H-loop....
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In the second equalization circuit connection method, and it works as shown in Figure 1-96. When the potentiometer wiper is moved lc inverting..
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Two circuits for laser transmitters. The first uses a simple laser pointer module. Any of the normal 3 or 5mW devices will function well. Imports from the USA or Hong Kong are frequently a higher power than the UK approved units. The modules normally contain....