New Circuits Page 88
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This circuit has an adjustable output timer that will re-trigger at regular intervals. The output period can be anything from a fraction of a second to half-an-hour or more - and it can be made to recur at regular intervals of anything from seconds to days....
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Make LED lighting that is powered directly from the AC mains (120-Volt AC), due to the lack of having any inexpensive AND safe enclosures for the circuitry. While I was gathering some old failed CFLs one day with the intention to recycle them, I realized....
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When ever I find an easy way to do something I just have to make a record of it. There are some projects where you might want to do something wireless with the Logochip. This little circuit makes it pretty easy. First an explination of the Radioshack....
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The two-tone electronic doorbell circuit is composed of the trigger control circuit and doorbell generating circuit, and it is shown in Figure 3-108. Trigger control circuit consists of doorbell button S, resistors Rl-R3, electrical wear devices Cl-C3,....
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If possible, try to obtain TIP41 and TIP42 transistors, which are closely matched NPN and PNP power transistors with dissipation ratings of 65 watts each. If you cannot get a TIP41 NPN transistor, the TIP3055 (available from Radio Shack) is a good....
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This is a simple - easy to build - multi-purpose alarm. Build it yourself using stripboard or veroboard and a few cheap off-the-shelf components. Fit it to a door, window, shed, garage, cupboard etc. It`ll alert you to intruders. Fit it to a shop-door - and....
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I`ve been getting my mosfets from Allied too. WAY cheaper than digikey. Let me see if I...
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This is a circuit schematic diagram for the VU meters. Circuit diagram is controlled by IC TL072. A measurement circuit according to the National general application. Around the input circuit IC1 to make adaptation and amplification of the trimmer TR1....
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I like the circuit, because it is good and enjoy. It just the signal status ""1"" and ""0"" only. And frequency generator is....
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Incredible Shruthi-1 hardware synth with its excellent SMR-4 MkII filter board, both of which I built about a month ago and which I love to bits for exploring new sounds. However, as a sound designer I`ve always been interested in pushing the boundaries, so....
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A 50W isolated forward-converter switching supply for telecom applications is described. Most aspects of the design are discussed....
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The following circuit shows about Solar Tracker Circuit Diagram. This circuit based on the LM339 IC.Features: 10n ceramic capacitor (103z), 1meg ....
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The MIC2199 is a synchronous buck switching Regulator controller. An all N-Channel synchronous architecture and powerful output drivers allow up to a 20A output current ca- pability. The MIC2199 operates from a 4. 5V to a 32V input and CAN be programmed for....
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This circuit produces oscillating frequency around 1kHz, and able to be converted by changing the value of resistor R1. The speaker will produce a long beep sound with 1kHz frequency. Here is the schematic :..
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A simple function generator. Just to generate a certain frequency. While waiting for the AD9832 chip to arrive, I came up with a very simple version of the DDS synth, using just the 2313 and a resistor network. It`s controlled over RS232 from a small Windows....
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The frequency is pretty stable as the volts drop. The reason i called it the backwards jt is cause it works best with a bifilar coil and one transistor. and with one tweak to your circuit you can run a battery down to 0. 1 volts. using a 2n3055 transistor....
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well i did a quick search, and i didnt find much on this issue my question is: Can anyone provide a diagram on how cruise control is wired up (94-....
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Multisound generator is very interesting project in the series of alarm project multisound generator generates 8 different type of sound circuit diagram of.various electronics project...
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This is a third order low pass filter that has corner frequency of 20kHz. It is twice as high as the auto-zero clock frequency. Here is the circuit : The input....
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How to handle digital input/output(I/O) in Avr Microcontroller? Explained using basic programs and circuit to glow an LED,generate stepper motor sequence,read push button switch and key debouncing....
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This circuit is a simple 8-bit analogue to digital converter circuit which is connects to PC serial port. The circuit is based on TLC548 A/D-converter chip (might be hard to get nowadays, Texas Instruments makes this IC), which is an A/D-converter with....
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This is an unusual circuit for an ultra-low distortion power amp. According to my original notes the circuit is dated January 1977 so the circuit is not exactly modern but it is still sufficiently different to be interesting. The circuit was designed and....
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Here we`ll discuss how to make an electronic spy bug circuit using two methods, one that consists of wire link from the transmitter to the receiver, and the other which is completely wireless and can be used to eavesdrop a particular conversation over a....
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This is a quick how-to guide for making a stereo VU meter using the LM3915/LM3916. The LM 3916 is an integrated circuit (IC) that takes analog voltage levels and drives 10 LEDs, LCDs, or vacuum fluorescent displays to represent digital voltage levels just....
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This timer is based on a simple Monostable Circuit. The length of time the relay remains energized - the ON period - is controlled by the values of R3 & C2. And the length of time the relay remains de-energized - the OFF period - is controlled by the values....
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The size of the photoflash charger circuit is greatly simplified and reduced by Texas Instrument (TI) TPS65552A. A photoflash capacitor charger based on this....
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Ultrasonic sensor circuit is a sensor that consists of transmitter and receiver. This circuit is useful for remote control. The frequency of sound produced by a series of Ultrasonic Sensor is above 20 KHz which is between 40 KHz 50 KHz. Used power supply....
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RF amplifier circuit diagram, deliver 1W for 2. 3GHz, built based MRF2001. This RF amplifier delivers about 1 Watt power output with 8-dB minimum gain at 24V voltage supply. The frequency can be tuned from 2. 25GHz to 2. 35GHz. Applications include microwave....
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The program uses two pulsewidth variables, pw1 and pw2; and two sets of routines, left1 and left2, right1 and right2; one for each motor. As you can see in the schematic, the first servo is wired as per the previous circuit. The second servo is now using B3....
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Control pulses transmitted in blanking interval by tv network transmitter are decoded by receiver circuits shown and translated into six different switching actions used to introduce special program matter such as commercials, weather reports, and local film....
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The Infrared IR Receiver circuit is not particularly unique. The main components are the phototransistor, the microcontroler and the amplifier. If you can understand how these three devices transfer data, then you should have no problem getting the circuit....
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This is a circuit of a microcontroller AT89S52 Thermometer and 12-bit ADC LTC1298, programs written in the language c program with digital filtering and interface the LED display. The reading provides 0. 1C sensitivity. The hardware block and circuit diagram....
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The author gave his partner a radio controlled (RC) model car as a gif t. She found it a lot of fun, but thought that adding realistic lights would be a definite improvement. So the author went back to his shed, plugged in his soldering iron, and set to work....
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A simple test circuit to fault find audio and radio equipment. Can be used to inject a square wave signal, rich in harmonics, or used with headphones as an audio tracer. A single pole double throw sitch is used to switch between inject and trace modes. The....
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Hey Guys, I`d like to build a analog summing amplifier. Perfect would be with tubes. I want to get the typical tube sound, if it`s possible. So I want ....
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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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The heart of this circuit is a crystal oscillator. A 10MHz crystal is used to produce highly stable carrier frequency. The sound signal from the condenser mic is amplified by the amplifier circuit consist of transistors Q1, Q2 and Q3. The amplified audio....
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Here is a simple circuit that starts playing the car horn whenever your car is in reverse gear. The circuit (1) employs dual timer NE556 to generate the s....
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This circuit has an exceptionally fast high frequency response, as demonstrated by applying an 100kHz square wave to the input. All graphs were produced using Tina Pro...
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PIC controlled 500W `Modified Sine Wave` Inverter. The PIC16F628A is programmed to produce a logic 5v signal for 5ms at pin 17 then 15ms off....
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A very simple and interesting project / schematic of a cell phone signal activated LED circuit. The circuit will light up an led when you call from your cell phone....
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Battery Indicator Circuit For The Caravan Circuit This i-TRIXX circuit can prevent a whole lot of trouble for those of you who go on holiday in a caravan. It would be a significant damper on your holiday spirit when you are read....
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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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This is simple to build AVR programmer for Atmel microcontrollers from AVR family. The microcontrollers must support serial programming. AVR programmer is connected to a PC through the RS232 serial interface and can be used with the PonyProg or Avrdude....
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The metal detector shown here may well represent a new genre. At any rate, after some exposure, it is regarded as such by those who have seen it. It is based on a standard transformer coupled oscillator(TCO) - hence the name Coil Coupled Operation (CCO)....
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Here is a very simple and useful project / schematic of a 12V to 3V converter circuit. The output current of the circuit is around 1A....
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This is a simple electronic alarm circuit that imitates the chirping of a canary. The circuit is nothing but a Hartley oscillator with few more passive components added. As the capacitor C1 charges through the resistor R1 and the transistor Q1 is driven to....
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A diesel tractor that has a magnetic reed switch in the fuel tank to indicate low fuel. This switch is open when there is fuel in the tank, and closes when the level drops below it. When this switch closes a 12v relay is energized to disengage the fuel....
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Automatic water level controller circuit is a simple engineering project. It can automatically switch ON and OFF the domestic water pump set depending on the tank water level. You can implement this motor driver circuit at your home or college using less....
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In order to programm devices which run at 3. 3V (either SPI-based ones like AVRs or JTAG-based ones like CPLDs), the input and output signal levels need appropriate level conversion (or level shifting) because a 5V input may not see HIGH at 3. 3V and a 3. 3V....
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The detect ringing signal tone circuit with light and sound.It is easy to use and good quality, Do not enter the power supply. Which as Detect ringing signal...
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DS1307 is a hardware realtime clock, which works on I2C protocol. Better graphics using the same old fashioned alphanumeric LCD (type HD44780). Icons which shows the status for Alarm ON/OFF state, which gives a nice and cute look to the clock. Circuit....
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You are asking how to connect up some lights so that when the phone rings, they flash. This is very useful in a situation were there is lots of noise and it is impossable to hear the phone, such as a workshop. Here is such a device. The ring detect part of....
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The following circuits is one of the power amplifier circuit for FM transmitter with an output power of 30 watts. Power amplifier circuits for 30-watt FM transmitter, the transmitter uses power transistor type 2SC1946A. Power FM transmitter circuits uses a....
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Here is a simple mains power failure alarm/detector circuit that produces an alarm whenever the mains supply fails. Lot of such circuits are available, but the peculiarity of this circuit is that it requires no back up power source like a battery to power....
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The TS-440S, like probably a number of other radios, does not mute the microphone while you are using the rear audio connector for digital modes. So, unless you unplug the microphone each time you want to use the digital modes, shack noises will get on your....
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after the success of making a data acquisition box for our porsche chumpcar where we were able to collect lap times and telemetry data during our auto club speedway race weekend i decided to create a new ioio box tailored to my turbo this will likely also be....
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Normally mobile batteries have a lifespan of 2-5 years under normal usage. But then we have to replace them. Nowadays there are cheap replacement batteries which cost no more than 1$. But these low cost batteries run only 6-12 months. What to do with the....
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This meter circuit uses just one IC and a very few number of external components. It displays the audio level in terms of 10 LEDs. The input voltage can vary from 12V to 20V, but suggested voltage is 12V. The LM3915 is a monolithic integrated circuit that....
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CAD`s original E100 microphone was an inexpensive (for its time) multi-purpose studio condenser microphone, with an electret capsule and a neutral sound profile. Part of CAD`s Equitek series, the E100 had an innovative transformerless amplifier circuit....
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Magnetic pick-ups in musical instruments have a relatively high output impedance. This can result in a reduction in treble response when connected via a long cable run or to equipment with a low input impedance. This preamplifier provides a high input....
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Keypad Controlled Switch No2 Circuit The circuit is drawn with a 12-volt supply - but it will work at anything from 5 to 15-volts. All you have to do is choose a relay suitable for the supply voltage you want to use. Replace the....
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Here is the schematic diagram for the original arcade version of Pong, the first digital video game. Unlike other video games of the time, Pong used an all digital circuit to produce the graphics, sound and game control. There is no software or processor,....
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Most, if not all, recent cars have an impressive amount of electronics, whether it be ABS brake systems, engine control with injection calculators, airbag....
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Filament Light Dimmer Circuit This simple triac dimmer can be used to control incandescent filament lamps up to 200W. The circuit operates on....
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Figure 1 shows the schematic for a universal input, 7. 6 V, 700 mA CV/CC power supply for LED Driver applications, using the LinkSwitch-II product LNK606PG in a‚ flyback con guration. The LNK606PG (U1) combines a power switching device, Oscillator CV/CC....
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I began tracing the BASH amplifier circuit for my V. 2-400. The following schematics are my best effort to document what I found. I have also described design defects I have found and what I am doing to improve them. Evan Shultz spent an amazing amount of....
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Instructions for wiring and installing a Doorbell in your home....
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This is an Infrared beam breaking alarm ideal to use in entry or passages.It is based on the working of the popular IR sensor Module TSOP 1738 which sense....
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Q1 and Q2. to form a table, on the left side, list the the four possible states of Q1, Q2; on the right side, write the values that Q1 and Q2 will assume after the next clock pulse. The table will then contain a complete description of the state machine.....
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A prescaler attached to a PIC to get a simple frequency counter. I would suspect that it would just become a "module" that I include in some other design projects later. Initially I need to get a working sample. Target range would be 1mhz through 400mhz...
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Input J4 has offset function provided that no plug is inserted into J4 as the switching contact of J4 is connected to the positive supply voltage in this case (via the protection resistor R8). At J5 the inverting sum of all inputs is available. J6 outputs....
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This is probably the simplest Circuit to test a Servo, This circuit tests the speed of servo. Here we use potentiometer to controll the speed of the servo. By applying very less voltage like 4. 5V and reducing the pot value, you can also adjust the position....