Top Circuits Page 148
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Input coil L1 consists of four turns of 20SWG enamelled copper wire (slightly space wound) over 5mm diameter former. It is tapped at the first turn from ground lead side. Coil L2 is similar to L1, but has only three turns. Pin configuration of transistor....
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Using L297-L298 integrated circuits manufactured by SGS Thomson (ST) can be made a control circuit for a stepper motor with two phase bipolar or unipolar four-phase (maximum current allowed on stage is 2 A). This integrated motor driver generates control....
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This is a design of the circuit diagram of a simple and straight forward battery charger that can be used to charge all type of 12V rechargeable batteries including car batteries. For indicate when the battery is fully charged, the ammeter reading will be....
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The secret to preventing instability (motor-boating) with a high gain circuit like this is to power the speaker from a separate power supply! You can connect an extra station (or two extra stations) to this circuit design. Build the circuit into two....
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This very simple alarm circuit is sure to have the police beating a path to your door - however, it has the added advantage of alerting you to their presence even before their footsteps fall on the doormat...
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By adjusting its Adjust pin, output voltage and current can beregulated. VR is placed between the adjust pin and ground to provide an output voltage of 9 volts tothe battery. Resistor R3 Restrict the charging current and diode D2 prevents discharge ofcurrent....
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The pcb of this circuit must be placed near the antenna, in a small metallic box. This VHF antenna circuit must be powered from a 12 volts DC power supply circuit, you can use a 12 volt battery, because the current consumption of this circuit is very low....
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The LM35 of National Semiconductors that is used in this project is a precision centigrade temperature sensor, which has an analog output voltage. It has a range of -55 C to +150 C and an accuracy of ±0. 5 C. The output voltage is 10mV/ C. The output voltage....
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This is a simple project circuit for mixes two or more channels into one channel (eg. stereo into mono). The circuit can mix as many or as few channels as you like and consume very little power. This is the figure of the circuit. This circuit is based on or....
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This circuit is conventional Pierce type oscillator that uses a JFET. The circuit uses fundamental mode crystals. It has decent performance and reliability if we use a low noise JFET. This is the figure of the circuit. The feedback is controlled by the C1....
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This is a simple design circuit for transmitter video. This circuit can radiate as far as 50m. This video transmitter can be used with the camera as a source. You can view them on VHF channel analog TV. Supply voltage to the transmitter can use 9V battery.....
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A pH electrode measures hydrogen ion (H+) activity and produces an electrical potential or voltage. The operation of the pH electrode is based on the principle that an electric potential develops when two liquids of different pH come into contact at opposite....
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This is the design circuit for a Colpitts-crystal oscillator circuit. It is suitable for low frequency crystal oscillator circuits. Using the 2N3823 JFET, this circuit has excellent stability because the temperature will not vary the 2N3823 JFET circuit....
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Using a the controlled-half-plus-fixed-half-wave phase control method, this circuit can regulate an 860 a watt lamp load from half to full power. This circuit control the light output of the lamp from 30% to 100% because Half power applied to an incandescent....
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Here`s a design of a phone bug circuit. This wireless telephone line spy circuit can be used to transmit the phone conversation to a nearby FM radio. This circuit must connected to a normal phone line. This is the figure of the circuit; The first transistor....
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This is a chapter that was cut from Applied Robotics 2 because of space issues. It discusses motor control issues in general and then moves on to build a 5-amp motor driver. The principles involved can be applied to much larger motor controllers. Though it....
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Model SimpleSolenoid "Simple network model of a lifting magnet with planar armature end face" parameter SI. Resistance R = 10 "Armature coil resistance"; parameter Real N = 957 "Number of turns"; //yoke parameter SI. Radius r_yokeOut = 15e-3 "Outer yoke....
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Below that is the clock section. The knob controls the internal oscillator`s speed, and that can be voltage-controlled via the `Speed In` input. Or, you can insert your own clock signal via the `Clock In`. This is slightly unusual, but I think having the....
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This circuit uses a single chip, IC TL074 for achieving a 5-band graphic equalizer for use in Hi-fi audio systems. The 5-band graphic equalizer is true for radio-cassette player, and car stereos. This unit features: low distortion and low noise, wide range....
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For some ten years Texas Instruments have been developing solid state speech technology with the result that speech can now be produced which faithfully preserves the character of the spoken voice including intonation, accent, dialect, and pitch. Linked to a....
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A "talking" computer is not necessarily expensive - not if you mate one of the low-cost computers (Sinclair ZX-80, ZX-81, or Timex 1000) with Texas Instruments popularly priced "Speak & Spell" learning device. The combination give you several hundred clearly....
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Mostly everything has been put together for the electrical portion of the project. Serial communication is almost working and will be used in conjunction with a Teensy 2. 0 chip to communicate through serial USB and the mega128. A TTL UART serial driver such....
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The design is based around a pair of 433MHz wireless modules. These can be bought pre-built and contain all of the radio frequency components that we need. We use these modules in our two circuits; one to transmit our vario audio and the other to receive and....
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At the start condition all pin 15 are connected to the ground, so R0 is energized. A 555multivibrator sendsthe clock signalto IC1, which activates the outputs from R0 to R8. This simple circuit can be utilized to drive a monostable relay through a single....
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Microphone amplifier schematics that may be used with either Electret Condenser Microphone (ECM) inserts or dynamic inserts, made with discrete components : Make a PCB in very easy steps. ! Create your PCB design using PCB designer software like Eagle, print....
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An 8 ohm speaker is used both as a microphone and also an output device. The BC109C stage amplifies in common base mode, giving good voltage gain, whilst providing a low impedance input to match the speaker. Self DC bias is used allowing for variations in....
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With the preset at its max. the flashing rate of the LED is about 1/2 a second. It can be increased by increasing the value of the capacitor from 10uF to a higher value. For example if it is increased to 22uF the flashing rate becomes 1 second. Make a PCB in....
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The 555 feeds its output (amplified by Q1 and Q2) to the input of transformer T1, a reverse-connected filament transformer with the necessary step-up turns ratio. Capacitor C4 and coil L1 filter the input to T1, assuring that it is effectively a sine wave.....
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The first part of the circuit here is a preamplifier consisting of transistor Q1(2N2222). The collector of the Q3 is coupled to the base of Q2 (2N2905A), which forms a complementary symmetry pair with Q3 (2N3053). The amplified signal is available at the....
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This amplifier comes with high fidelity (Hi-Fi), high sensitivity, low power consumption and low distortion. It will be nice for your high fidelity sound system. :) Make a PCB in very easy steps. ! Create your PCB design using PCB designer software like....
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This is 6 Channel Audio Mixer circuit. 3 channel for microphone input and the others 3 channel for audio input like CD player, computer, or television. There will be 6 potensiometer to control the volume of each channel. Make a PCB in very easy steps. !....
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2N3819 is an n-channel JFET especially manufactured for RF and mixer applications and provides very low noise, very low distortion and excellent high frequency gain. Make a PCB in very easy steps. ! Create your PCB design using PCB designer software like....
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This is digital clock schematic diagram. This circuit is quite complex and quite difficult for a newbie because this circuit uses IC with some a complicated connections. The voltages that supplied to the circuit are divided in two lines. The voltage +5VA....
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Voltage output is controlled by 10K variable resistor. Output voltage range value will be about 3 to 15 volts, and current range is about 10mA minimum and 2 amp maximum. Reaching the current limit will reduce the output voltage to zero. Make a PCB in very....
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The servo motor have many utilizes in everything from robotics to puppetry to photography and beyond. These tiny motors can position their output shaft to any position on command and hold that position. Most servos possess a range of motion to about 210....
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FM transmitter circuit which is build using single chip of MAX2606. A very simple FM transmitter connects your home-entertainment system to a portable radio that will be carried surrounding the house and into the back yard. As an example, it is possible to....
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The circuit diagram of stereo PLL FM transmitter based BH1417 chip. This is certainly the most recent BH1417 FM Transmitter design diagram from RHOM that consists of lots of capabilities in a single tiny package. It includes pre-emphasis, limiter to ensure....
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This is a simple visual indication of the audio level signals, adaptive to various user needs. Can be adapted to different input levels, adjustable by trimmer TR1 (state) - TR2 (Gain), then rectified by diodes D1-D2 (standard negative mark-recovery periods)....
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This circuit connects in series with your home phone line and delivers the phone conversation through the FM band any time you pick up the telephone handset. Transmitted signal could be tuned by any FM receiver. The circuit features an "On Air" LED indicator....
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Here the schematic diagram of mic preamplifier which build based on operational amplifier TC251. The TLC251 is operating in low bias. The circuit works with only 1. 5 V supply draws electric current of only 10 mA, so the battery operation will be prefered.....
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This is the easy build surround sound processor circuit using the digital delay process method. This audio processor isn`t applying any unique function ICs that tough to obtain parsonaly, and designed in only common purpose ICs. The kind of this Surround....
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This is the schematic diagram of basic oscillator circuit which using two transistors. When two transistors and a couple of passive components are connected as shown in the figure, the circuit starts to oscillate. The frequency of oscillation can be adjusted....
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Here the very simple and easy build gold detector circuit. The circuit capable to sense gold or metal or coins from a distance of about 20cm, depending on the size of the object to detect. The circuit oscillates at about 140kHz and a harmonic of this....
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This is a 2-station simple intercom circuit build based on transistors part and using common 8R mini speakers. The speaker works as microphone and generate sound, so there is no need microphone for this intercom. The "press-to-talk" switches should have a....
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Voltage Regulators low ability burning IC 78W alternation acclimated in our chart is now so bargain they are an economical another to simple regulators NPN-stabilizers. In addition, they action the allowances of bigger regulation, accepted absorbed /....
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We have modified the schematic diagram above with the addition of a 220uF smoothing capacitor between the base of transistor Q1 and ground. Without this capacitor, the relay chatter (relay switching on and off many times per second) was terrible around the....
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The Picture beneath is shows the ambit diagram of the SPI Flash programmer accouterments interface, the ability to the interface is provided either by a 9V dc adapter or a 9V battery. The 74HCT367 IC absorber the alongside anchorage signals. It is....
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To convert a standard LCD interface parallel to serial interface model, use a microcontroller or a dedicated circuit such as the MIC 702 Mictronics you can download the complete data sheet and French by clicking this link. This is a circuit specially....
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The charger can charge a single cell or a number of series-connected cells up to a maximum of 18V. Power transistors Q1 and Q2 are connected as series regulators to control the battery charger`s output voltage and charge-current rate. An LM-317 adjustable....
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To avoid distortion of the image, when receiving data through the UART, for VGA, it is recommended to make the data exchange with the terminal in approximately 300-600 us after a signal of vertical synchronization (VSYNC)...
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This is a simple low impedance preamplifier circuit diagram. It used to amplify an audio signal. This circuit use a 12Vdc sources and very simple because work with less components...
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TV RF Power Amplifier 14W This RF power amplifier works in frequency 470 - 860 MHz UHF Band IV and V with power out 14 Watts with input power 1. 5 Watts. The power amplifier is suitable for amplifying rf signal your tv transmitter with 0. 5 - 2 watts power....
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Battery Charger in general can be interpreted as a means to recharge the battery charge. Principles of good charger circuit is capable of providing resources to perform effectively charging the battery, efficient and safe. AVR-Based Battery Charger ATMega....
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With this circuit you can make the amplifier volume control without having to use a potentiometer, but using a circuit with IC DS1669. For working voltage of the IC of this type was not 5 volts, but 4. 5 VOLTS to 8 Volt, but used in this circuit at 5 V....
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The FM telephone circuit is built on a PC board that is so small it can easily be fitted inside the housing of a telephone making it an instant pseudo-speak earphone. This FM circuit connects in series with telephone line, steals power from it, and transmit....
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This sound level measuring device circuit can live used to control the intensity of a sound recording before in the field of a disco. It has 5 measurement domains connecting 70 and 120 dB; recital accuracy is 0. 5 dB. Microphone M1 is used to receive the....
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This week I want to share a new favorite chip of mine, the LT1970 power op amp from Linear Technology. This nifty device runs from a 36 V supply and can source or sink 500 mA. That`s not too unusual, but how about programmable current limiting, outputs to....
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A 2m ham radio transceiver that includes all the necessary circuitry, in particular the voltage-controlled oscillator ( VCO ) + phase-locked loop ( PLL ) for frequency synthesis, low noise amplifier ( LNA ) for the receiver front-end, power amplifer (PA) for....
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The induction receiver shown below is very sensitive and can serve a variety of purposes. It is excellent for tracing wiring behind walls, receiving audio from an induction transmitter, hearing lightning and other electric discharges, and monitoring a....
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The current testbed deployment provides some degree of device heterogeneity by integrating two different type of IoT experimentation nodes. The deployment is mainly based on a largely utilized TelosB experimentation platform (170 nodes) and to a smaller....
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A step by step guide about how ATX power supply works with an example of a 200 Watt PC Power Supply function....
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The Part of 1986 Honda Civic Wiring Diagram: neutral, automatic choke hater, charge warning light, resister, starter motor, sterter solenoid, thermo sw, reguletor, alternator, destributor, igniter, ignition coil, spark plugs, air temperature sensor,..
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The Part of 1995 Ford Ranger Wiring Diagram: transmission range sensor, electronic engine control, clutch pedal position switch jumper, electronic engine control, speed control, automatic transmission, starter interupt relay, rela box, starter motor during....
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The circuit was taken from one of the old elektor electronics magazine and it is indeed a very cute little circuit which may be used for creating high intensity lighting effects during festivals, parties and fun gatherings. Diodes D1 and D2 along with the....
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This power supply can be used to obtain a regulated power output, variable right from zero to 300 volts maximum. All the devices should be mounted on heatsinks. You must havecome across many power supply circuits which are designed for supplying anywhere....
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This circuit was originally designed to detect weak flashed of laser light bounced off of a fabric video projection screen. It was used as part of a firearm training system. It generates a 100mS output pulse whenever it detects a 3ms to 5ms-laser burst,....
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The following circuit shows about Current Limited Solar Battery Charger Circuit Diagram. This Lead Acid or Ni-Cd Battery Charger Circuit Diagram utilizes solar energy to charge a 6 volt 4. 5 Ah rechargeable battery for various applications. This is a great a....
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Solar PV Modules: UL Listed and installed world wide, these solar panels are reliable, with an excellent performance record in the field. You really don`t have to be a mechanic or be mechanically inclined to make your own solar module panels. Prices are....
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Licensing This file is copyrighted. The individual who uploaded this work and first used it in Licensing This file is copyrighted. The individual who uploaded this work and first used it in Licensing This file is copyrighted. The individual who uploaded....
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I hacked together a quick and dirty Arduino MIDI-to-DMX control for our robot band Science Fiction Children. It`s really simple! And here`s how I did it. I have two really cheap LED Par56 from Stairville (DMX controlled), a simple DMX-Dimmer pack and use....
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ESP - The Audio Pages. Amplifier design techniques, find out how amplifiers work, and how to design them....
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There is one class of filter called "all-pass" that does not affect the response, only phase. While at first look this might be thought rather pointless, like all circuits that have been developed over the years it often comes in very handy. Filters also....
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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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ESP - Sinewave generation principles. While this should be a simple enough exercise, it isn`t, and this article explains why....
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It is fairly safe to say that most Bulle clocks will need their magnet rejuvenated before they will run properly from the normal single 1. 5V cell. The first "real" magnet material was cobalt-chrome steel, in 1921 [ 1 ]. Prior to that, carbon steel was....
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ESP Lighting Information Page - Dimmers, electronic transformers, etc. - how they work, what`s wrong with them and how it can be fixed....
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ESP - The Audio Pages. Tips and techniques for passive crossover network design, including a design spreadsheet. Much more information than you are used to on this topic....
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A replication of Afrotechmods laser tripwire circuit. Using a simple laser pointer, IRF244 MOSFET ( most NPN transistors would do the job), a couple of resistors and one LDR..
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This is a license to use the files to make up to 12 boards. If you want to make more contact me. Please note that you agree to make 12 or fewer in your message when you order. You may not resell the boards. If you want to do that contact me...
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Another version of the 1W VHF amplifier for the FM transceiver, well, in fact, it`s still the same version since I didn`t managed to get 1W. YET! Today I made some tests with a 2n2553 and a 2n2866. it melted solder in one of the base resistors (never I had....
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Resistor between pin 10 and 11 is a 100K Ohm one, the other a 2K. Fixed capacitor was by trial and error, to get crystal on the exact frequency, somewhere near 39pF and the variable one a little more: 39+20var, see 4060 datasheet. The output circuit on the....
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This article describes the steps involved in concieving and realizing the interactive art installastion ""Rain"", also known as ""Umbrellas"". It is intended for anyone who wants insight in the parts that make up an interactive installation....
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Magnetic tampering technique is done by bringing a high powered magnet in close proximity of the domestic electricity meter. When this is done, the disc stops rotating. The circuit for the magnetic tampering detection circuit is as shown above. The vital....
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Free-space optical (FSO) communication uses light as a medium to transmit data. We did communication between two computers using laser(without help of any existing means of communication). We sent texts from one PC to other(Laser Chat Messenger) just like....
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The techometer also called revolution counter is an instrument that measure the speed of a rotating machinery. Generally these measurements are rated in revolutions per minute (R. P. M). In this project we have decided to make our own sensor using a led as....