Popular Circuits Page 123
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Using the tester is easy, starting with power off, insert a transistor into the test socket. Set S1 for NPN or PNP androtate S3 to the required test position. Rotate VR1 so the desired collector emitter voltage. Pressing S2 now allows the measurement of hFE....
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Hey guys, apologies in advance for the wall of text, but this is a diagnostic problem and I felt I should include as much info as possible for those....
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Many a times one needs an ex- tra telephone ringer in an ad- joining room to know if there is an incoming call. For example, if the telephone is installed in the drawing room you may need an extra ringer in the bedroom. All that needs to be done is to....
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The schematic below showsthe ICL7135 integrating analog to digital converter (ADC) functional diagram. According to the datasheet, an integrating converter is the right choice for panel meters and digital voltmeter applications. It also can be used for....
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To listen old vinyl LP`s in a correct sounding on a sassy with dynamic cartridge you need a circuit, named RIAA corrector. This circuit you can find in old amps, but it isn`t embedded in home cinema equipments or amplifiers can be obtained nowadays. Also, if....
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The applied microcontroller is an ATMega8 clocked at 16MHz. This microcontoller can shift out arbitrary wavefroms from its flash or SRAM storage at a rate of 2MS/s (and even faster!). The 8bit data is fed from portD to the AD converter ( Analog `s AD7524)....
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If you need a tool to save electricity you use, so in this article a simple power saving device circuit diagram is very suitable for you to test. Basically, this tool can really save electricity in your home from 10-25%. Work of this tool is simply to reduce....
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The 7555 timer IC used is a low power version of the standard 555 timer. A ‘superbright red LED is used because this provides a bright flash with a low current. Th....
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That Circuit is an advanced bicycle lighting system which will power your lights and also charge four NiCd batteries while you running in the streets, for keeping the lights on while the bicycle is stoped. Its fully automated without any switches. ..
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Circuit diagram of this simple in design for high voltage DC Impedance. This is a circuit diagram with circuit design that was built by uA741 IC. IC is the op-amp non-inverting DC amplifier. IC that has a negative feedback through the DC meters need to 1mA....
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A schematic diagram of the high-voltage power supply recommended for use with the power transformer. This power supply can also be used for other equipment with similar requirements.CAUTION: hazardous high voltages....
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Efficiency can be increased by using a germanium transistor at the 33 ohm current sense resistor, and by using a proper torroid core in place of the crappy ferrite bead. Single AA cell powers two LEDs at constant current....
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In this post I will publish the circuitschematic diagram of Power Amplifier with 500watt output mono, yesterday happened to date July 18, 2012 order I able to make Power Sound System 1000 watts stereo output, which is used Sanken Transistor Final original....
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This circuit uses a synthesized sound chip from Holtek, the HT-2811. This reproduces the sound of a ""ding-dong"" chiming doorbell. Additionally, the circuit includes a CMOS 4026 counter display driver IC to count your visitors....
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It is using the IC-type multi-vibrator for the oscillator of the alternating current. The frequency is about 60 Hz. I used 7400 as the IC for the oscillator but 7404 is OK. The signal of the oscillator has the switching operation with TR1-TR4. TR2 and TR4....
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To amplify the small current signals as an electron collector inside a vacuum chamber, it is convenient for reasons of noise and bandwidth to have a "head-amplifier" attached to the chamber. Op N-amp 1 is a precision device with bipolar bias current and low....
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A 7 MHz oscillator with a variable crystal oscillator (VXO) operates very stably, but it allows only a small frequency variation (approx. 5 kHz). In contrast, a VFO with an LC resonant circuit can be tuned over a range of several hundred kHz, but its....
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He artfully showed that within the quadrature concept, there must be three forces that can be manipulated and not just the two we have been working with [EM]. Electric field has Positiveand Negative voltage, Magnetic field has North and South poles,....
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This project is an extension of Metal Detector MkI, and shows how metal objects are detected. It is the second in a series of circuits and allows a great deal of experimentation, especially if you have a CRO (Cathode Ray Oscilloscope) and a few items to....
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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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A typical, low cost, FSK Modulator TA0038 is implemented by injecting the modulation voltage into the phase lock loop of the Carrier synthesizer. This is done in two ways, by summing the modulation voltage and the loop error voltage together and applying....
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1200 to 6000A-10V three-phase thyristor power regulator circuit plating It consists of a main circuit, trigger circuit, synchronous power, voltage negative feedback circuit and..
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As shown in Figure it is a temperature compensated with a negative voltage to follow the positive changes in the symmetrical voltage integrated power supply. This circuit is ch..
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This Project is made up with AT89C2051 and the RTC DS1307. It has a large Seven segment display. The standard remote control is used to change the Time...
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This adaptor lets me program 8 or 20 pin DIP devices using the In-System Programmer (ISP) described in Atmel's AVR910 application note. This circuit provides power and clocks for the part to be programmed and power to the ISP circuit. When programming 8 pin....
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The input consists of two comparators that operate with different reference voltages supplied by separate potential dividers. ..
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This is a very simple circuit that can detect electromagnetic radiation. The circuit can even detect hidden wrings. A 1mH inductor is used to sense the electric field...
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FIG aa, bb, and ce three-phase windings, respectively. Double throw switch Kl-l ~ Kl-4 hit the left side, that switch l and 2 phase, at this time, aa and bb in series with the ..
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This signal tracker and lock detector combine to make a precision tone switch. Filter R3/R4/C2 determines..
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This is an improved IR remote control extender circuit. It has high noise immunity, is resistant to ambient and reflected light and has an increased range from remote control to the extender circuit of about 7 meters. It should work with any domestic....
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Prototype board for 40 pin Atmel ATMega microcontrollers with power supply circuit, 8MHz crystal oscillator circuit, RS232 port, reset IC, status LED, and 10 pin STK ICSP port.FR-4, 1.5 ....
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Most audio amplifier systems must have preamplifiers with many different characteristics. These include high-gain linear response for magnetic microphones, low-gain linear response for tuners, and high-gain RIAA equalization for magnetic phone cartridges. To....
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Current-voltage conversion circuit is often used in the current detection circuit, shown 6-19 ring inverter air conditioner current detection circuit, the circuit is mainly use..
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The circuit depicted here can be used as an indicator when the telephone receiver is off-hook. The circuit can be in corporated with old telephones that does not have such an indicator. The circuit uses a complementary darling to pair using Q1 (2N3904)and Q2....
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Check loop circuit for automatic telephone answering or tone generator for use reverse automatic repair. ..
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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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This infrared alarm barrier can be used to detect persons passing through doorways, corridors and small gates. The transmitter emits a beam of infrared light which is invisible to the human eye. The buzzer at the output of the receiver is activated when the....
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This application note uses a timer IC (ICL7555), CMOS logic and discrete transistors to automatically control the conversion the MAX190 12-bit SAR analog-to-digital converter (ADC). The delay between conversions can be programed using a resistor. Logic....
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The important allotment of the circuit is formed of the Colpitts blazon oscillator. C3, C4, C5, C6, CD1-CD2 and L1 determines the frequency. BF982 and bifold aboideau MOSFET are alive genitalia in oscillator. When the ascribe impedance of the MOSFET aboideau....
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A seven segment display is the most basic electronic display device that can display digits from 0-9. The most common configuration has an array of eight LEDs arranged in a special pattern to display these digits. They are laid out as a squared-off figure....
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By using the reverse binary counter and the binary-coded decimal decoder can obtained the step voltage, and by approximating this voltage can be produced the sine wave signal with sufficient accuracy, suitable for many purposes. In the circuit diagram of the....
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A great collection of touch switch circuits. A touch switch is an electronic device that enables us to control a circuit by simply touching a sensor. The circuit as you can see from its diagram is very simple and only uses 8 components. The heart of the....
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This Charger Can't be used as a Power Supply, Without having a battery in place. The Battery MUST be Connected to get power out. Note: This Charger Features a Reverse polarity Indicator. Instructions: Before plugging this charger into the 110 volt line (or....
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For all electrically conductive Fluid or liquid level measurement, this single-chip circuit is very compact and simple. This circuit is a voltage level sensor encouraged the AC bias supply for the sensor to prevent the electrolysis of the probes used. This....
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Probe/contacts may use a non-reactive metal. Gold or silver plated contacts from an old relay May be Used, however a cheap alternative is to wire alternate copper strips from a piece of veroboard. These will eventually oxidize over but as very little current....
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The AD592 is a two terminal monolithic integrated circuit temperature transducer that provides an output current proportional to absolute temperature. For a wide range of supply voltages the transducer acts as a high impedance temperature dependent current....
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This NiCd baterry charger circuit schematic can charge 6 volts as well as 12 volts NiCad batteries. It uses a transformer which can deliver 4 to 5 A curren....
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Because the Neon has inboard mounted turn signals, they are not visible from the side. Typically a manufacturer will mount a second light that is visible on the side or make the side markers blink, as they did on the 9x Neons. However on the North American....
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Drive a small (3. 6V, <1A) brushed motor bidirectionally with a PIC MCU. My available space is extremely limited, so I`d like to use a single 3. 6V power supply for both the motor and PIC, and a minimum of drive circuitry. I haven`t found a dedicated motor....
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Audio Amplifier 100W or 130W Outputshould be2(out=90W) or 4(out=130W) audio power transistors. PCB and layout Use T3 on Heatsink Component Ref./Value Type R1 120K 1/4W Resistor R2 3K3 1/2W Resistor R3 5K6 1/4W Resistor R4 3K3 1/4W Resistor....
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Though I`d make a quick how to guide for a remote power on switch for a DC to AC inverter. Rational: -I want to be able to turn off and turn on my....
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By designing a current difference buffer amplifier (CDBA) circuit for fabrication in a commercial CMOS semiconductor process, the versatility of this component can be applied in a variety of applications....
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How the circuit works is simple when you send a DTMF tone to the decoder the value of pin 15 goes high for a short time this makes an excellent trigger as it supplies a few volts to pin 2 of the 555 Timer this triggers the circuit and turned the relay on for....
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Crosspoint switches are ideal for use in video-security systems, which accept multiple camera inputs while providing playback and multiple loop-through to multiple monitors. To provide video loop-through or monitor outputs, these systems often require....
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If you use great IC PCM2702 from BURR BROWN / Texas Instruments you can create a fully functional USB sound card. This sound card can be powered from USB port and has one stereo output. You don’t need to install any driver for Windows XP and Vista, because....
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Several years ago a colleague suggested that I should be using PICs for my hobby, which then was amateur television. I spent many hours developing and experimenting with video mixers, faders and effects (FX) units, and all this was done sing analogue and....
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This simple circuit drives 6 LEDs in `Knightrider scanner mode`. Power consumption depends mainly on the type of LEDs used if you use a 7555 (555 CMOS version)...
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The microprocessor-controlled oscillator has a 8159 to 1 frequency range covering 2 Hz to 20 kHz. An exponential, current output IC DAC functioning as a programmable current source alternately charges and discharges a capacitor between precisely-controlled....
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Crystals usually operate at fundamental frequencies up to about 15 MHz. Whenever higher frequencies are required a frequency multiplier is placed after th....
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This circuit will not work unless the battery to be charged is connected with proper polarity. The battery voltage controls the charger and when the battery is fully charged, the charger will not supply current to the battery. The battery charging the....
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I am using this Class A Amplifier with a 12AU7 based valve preamp. It produces the most purest sound. I have no idea of distortion levels etc. but it has a very fine grain and delicately textured quality. With only one watt of output efficient speakers must....
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The Allegro ACS75x family of Current Sensors provides economical and precise solutions for current sensing in industrial, automotive, commercial, and Communications systems. The device package allows for easy implementation by the customer. Typical....
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The yellow LEDs are on a small PCB, which are easy to remove. On the PCB there is 3 yellow
LEDs and 4 diodes. Pictures of the PCB can be seen here : Top-side - Bottom-side.
The schematic is as follows : You now remove the 3 LEDs and the 3 normal diodes....
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The LM3915 is a monolithic integrated circuit that senses analog voltage levels and drives ten LEDs providing a logarithmic 3 dB/step analog display. LED current drive is regulated and programmable, eliminating the need for current limiting resistors. The IC....
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This circuit is a circuit diagram of ECM Mic Preamplifier. A microphone amplifier that can be used with either Electret Condenser Microphone (ECM). Preamplifier has a dynamic range very well and can handle anything from a whisper to a scream, but must be....
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Clock and Load functions, with Load being the first function described. U5, CD4013, performs the load function by controlling whether the shift register ICs are in the parallel or serial mode. For 99. 99% of the time, the shift registers are in the serial....
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The micro ampere meter shown here is basically a DC millivolt meter. The circuit gives full scale deflection for 0. 1V input. The current to be measured is passed through a known resistance R and the voltage drop across it is measured. Here the IC 1 uA 741....
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7208 seven metric system counter is used for frequency meter, it has latch and multiplexing function, and contains direct drive circuit and display driver circuit. 7207IC is divided the output frequencyof6. 5536 MHz crystal oscillator by2 12which produces....
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This timer will provide a sequence of up to ten separate events. The length of each event is set independently. And the sequence will run a fixed number of times - or repeat continuosly. The individual events within the sequence - can be made to repeat....
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Many low pass filter circuits for subwoofer are given here and this can be simply another one. The circuit given here using the opamp TL062 from ST Micro electronics. TL062 is twin high input impedance J-FET opamp that has very low power consumption and high....
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Sawtooth wave generator using NE555 and opamp uA741. NE555 is wired as square wave generator and opamp is wired as integrator.Circuit diagra, and working theory....
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Because the ball Jiu zoom magnification circuit is inverted feedback circuit voltage division ratio of the number of wells by the clamor of 2 to 5 to determine the partial pres..
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BD237 datasheet, .Selling leads from all over the world, ChinaICMart is the world`s biggest IC trading marketplace on the internet. We offer finest suppliers for BD237, you can also download the datasheet for BD237...
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As far as AC is concerned, the base is connected to the ground by the C3. Therefore, both input and output are connected to the base (common base amplifier)....
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Repeater or other unattended equipment can be turned on or off with ordinary telephone Phone at remote station is called and allowed to ring three times Caller then hangs up, waits 20 s, redials number and lets it ring three times again, then hangs up.....
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This unit is an upgrade of the previous phone call interceptor. Instead of using an answering machine to provide the outgoing message and recording functions, it uses the ISD4004 (from Windbond Electronics). The ISD4004 records up to 8 minutes of audio. I....
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With this dataselector, only one RS-232 port is used to connect two RS-232 devices (i.e., printer, plotter, etc.) with a mini-or microcomputer. The operation is very simple. Power on will reset FFI (QFFT ~ Low), which enables gates N1, N5, and N7. Now....
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This circuit uses a timer to generate pulses at a 5-ms clock rate. The pulses are shifted into the shift register, one at a ..
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This is a 2 x 70W audio power amplifier circuit which built using single IC STA550. The amplifier circuit require few external components (most of them are resistors and capacitors) and is very easy to design The STA550 audio amplifier is capable to provide....
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The reference chosen is an LM329 sub-surface (or buried) zener (ZD1). Whilst the circuit symbol is that of a zener, it`s actually an active device, which results in much lower dynamic impedance than a normal zener, of around 1ohm. It also has low noise....
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This is where truthfully you need to migrate to pic micro and possibly look at compilers such as offered by proton Smart which incorporate Sony IR in and Phillips RC5 codec`s But it is the safest particularly if you intend to use this for Security aware....
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Install the PIR module hanging from a 3 metre high mast (to cover 10 metre radius area) and connect its supply and relay terminals to our finished and enclosed circuit, observing right polarity. A 4-core screened cable can be used for this interconnection.....
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When supply voltage drops below a minimum threshold, it`s often good practice to disconnect the supply from the system to prevent poor performance or erratic operation. The circuit shown accomplishes this with minimal cost, board space, and complexity ( see....
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This simple and cheap circuit is not just for Christmas! There are just two resistors, a small-signal transistor such as a BC547, one ‘flashing LED and a....
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The Fluke interface diagram is an example of a typical microcontroller circuit. There is not really much to see, apart from the microcontroller itself. Nevertheless I`ll try to explain what`s happening here, because not everything is as obvious as it may....
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This circuit must be connected before the amplifier circuit. For maximum performance, you may use high quality electronic component such as metalfilm resistor, MKM capacitor (nonpolar), tantalum capacitor (bipolar). You may replace the power supply module....
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This circuit represents a Dive computer interface for RS232. Uses the MAX232A...
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The first problem is with the 16Mhz xtal the thing doesn`t even start to oscillate. But that`s a secondary problem. If I replace 16MHz xtal with a 11MHz one (or less) the oscillator starts. I can see with the `scope that I have a nice 11Mhz sinusoidal....
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The MAR-x preamp shown will cover up to 1.5 or 2 GHz with the correct MAR-x IC. ATTN1 should be omitted for low noise-figure.appli cations. ATTN1 and ATTN2 provide a means of limiting possible termination range,..
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Arcing completes a circuit -- closes a system -- between two voltage potentials. When arcing occurs, two oppositely charged static voltage potentials can cancel each other out. The arcing problems that occur are usually between two electrically isolated....