Popular Circuits Page 122
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A central door locking system permits all doors, often including the boot lid or tailgate, to be locked centrally from the driver`s door and, normally includes the front passenger`s door also. The locking and unlocking action is produced by an....
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Hello all Well, i live in South Africa, and as I`m sure many of you know, we have quite a bit of crime going on. So I was looking around for some....
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This circuit is basically the same as the 10 channel LED sequencer with the addition of solid state relays to control the AC lamps. The relay shown in the diagram is a Radio Shack 3 amp unit (part no. 275-310) that requires 1.2 volts DC to activate. No....
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Automatic electric furnace temperature controller shown. The closed circuit is formed from a temperature detection output control loop; the temperature rises, the output voltag..
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As discussed in previous blog posts, pin 5 terminal is voltage control terminal and its function is to control the threshold and trigger levels. Normally, the control voltage is +2/3VCC because of the internal voltage divider. However, an external voltage....
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Battery-Powered portable unit, Suitable for all type Televisions Using this low-cost project one can reproduce audio from TV without disturbing others. It....
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With the component values shown, the oscillator has a frequency of 8 kHz. When an input signal is applied to the base of Ql the current flowing through Ql is varied, thus varying the time required to charge Cl. Due to the phase inversion in Ql the direction....
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Op-amps has been widely used in low frequency oscillator (frequency ...
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Power op amps provide accurate speed control for dc motors. The circuit provides bidirectional speed control. The amplifiers` push-pull configuration ensures a full rail-to-rail voltage swing (minus the output stages` saturation drops) across the motor in....
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Many times we needed to use a simple circuit of preamplifier, with few components and facility of made. This circuit use a opamp. the Motorola, TCA5550, that contains a double amplifier, as outputs for the adjust of volume, balance, treble and bass. These....
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The schematic in Figure 1 is the discrete-element version of an A/D-converter drive circuit. The circuit converts a single-ended input to a differential output. The ADC`s reference voltage determines the common-mode range of the differential outputs. The....
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The VCO of Ul, a phased-locked loop. produces a low-frequency square-wave signal from 5 Hz to 2500Hz, which is controlled by varying the voltage to pin 9 via R2. The frequency threshold is set by Rl and Cl. Increasing the value of Rl increases the....
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The space-age sound device uses a 556 dual-times IC to produce a phasor sound. That IC is actually two 555 timer ICs in one 14-pin package, as shown in the schematic. Each timer inside the 556 is connected iri an astable multivibrator mode. The first timer....
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Usually, LED is powered by DC supply, but this circuit can make the LED can be powered by AC supply. This circuit can be used as power indicator for Water pump....
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It uses three-terminal adjustable voltage regulator power supply functions and suspension Electric thyristor presetting the LM317..
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Circuit SH-805 made holiday lights controller shown in Figure 2-64, it can be seen from Figure SH-804 circuit board of the same, but the pin locations manifold and control func..
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This circuit above uses a 13 volt zener diode, D2 which provides the voltage regulation. Aprroximately 0.7 Volts are dropped across the transistors b-e junction, leaving a higher current 12.3 Volt output supply. This circuit can supply loads of up to 500 mA.....
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As shown, mainly by the NAND gate IC1 (CD4096), counting/timing distribution circuit IC2 (CD4017), the analog electronic switch IC3 (CD4066) and the D flip-flop IC4 (CD40174) a..
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This motion detector alarm can detect a moving person from a distance of 1 meter. It uses a dual IR Transmitter-Receiver module HOA1405. When the sensor de....
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Flat-panel LCD monitors offer excellent image quality and more compact form factor than CRTshence, their steadily increasing popularity. Unfortunately, the complexity of their manufacturing process makes LCD monitors considerably more expensive than CRTs.....
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Another common single five lamp drive circuit is: LB1416/26/36, the circuit is a double row of finned-line 14 pin package. Its interior has two input amplifier and five voltage..
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The project described in this article is a constant Q, fully expandable graphic equaliser. Where most conventional graphic EQ circuits have a Q that is dependent on the setting of the pot, this one maintains the same Q at all settings. This is achieved by....
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So I`ve searched the forums, and the internet, and I`ve put together a schematic for a 16 channel passive summing mixer I would like to build. I`m....
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Wire the circuit diagram shown here on a bread board. The choice of V type of AVR is important. For example Tiny13V is very appropriate for such an ex....
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Wolfram SystemModeler ships with model libraries for a large selection of domains such as electronics, mechanics, and biochemistry. Now I am pleased to present a new library in the family, the SystemDynamics library by FranG§ois E. Cellier and Stefan....
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This is a Variable Voltage Regulator Circuit that is built by LM317T IC. The LM317T is an adjustable 3 terminal positive voltage regulator capable of supplying in excess of 1. 5 amps over an output range of 1. 25 to 37 volts. The device also has built in....
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SB5227 ultrasonic signal output is very weak, it must be sent to the drive via the power amplifier. A typical transmission..
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In this electronic breadboard circuit for beginners in electronics, when the ambient light level drops below a certain level, the LED switches on automatically....
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By use of transformers one can apply both voltage feedback and current feedback. There was an article in Ham Radio november 1979 by DJ2LR Ulrich Rohde giving details about this circuit. For the 2. 5MHz to audio converter the transformation ratio from drain....
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AC contactor switch to DC or pulse DC excitation can subtract short ring and core power consumption, thereby greatly reducing the power consumption of the electromagnet, and ca..
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This analog switch uses the 2N4860 JFET for its 25 ohm rON and low leakage. The LM102 serves as a voltage buffer. This circuit can be adapted to a dual trace oscilloscope chopper. The DM7800 monolithic IC provides adequate switch drive controlled DTL-TTL....
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This is a regulated and adjustable power supply which can deliver up to 20A and adjustable voltage between 4 and 30V. It is easy to build and uses LM338 an....
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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 Clavioline is an early electronic keyboard instrument, similar to my Hammond Solovox. Both of them are monophonic (single voiced) and tube powered, consisting of a keyboard and an amplifier. The first photo shows my Clavioline after restoration. In the....
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For any robot to perform the tasks it is assigned, a controller is required. The controller may be mechanical, electrical, electronic or a combination of these. It is the brain of the entire system and gives the robot its intelligence. Additional....
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Although this Power Supply was designed for the Modular Burglar Alarm - it has other applications. It provides an output of 12-volts - at a current of up to 1-amp. In the event of a mains failure - the back-up battery takes over immediately. And when mains....
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Amblone stands for AmbiLight Clone, and it is a Do It Yourself solution for imitating the Philips AmbiLight system...
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No DIY espionage kit is complete without a long-distance listening device, and no DIY long distance listening device is complete unless it uses a sweet laser in some form or fashion. If you agree with that statement, then you`re in luck, because the....
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This page`s mission is to help you understand how to use the STA013 MP3 decoder chip in order to design your own MP3 player. The player design described at the rest of these pages uses the STA013, but this page is intended to help you understand the STA013....
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1993 Jeep Grand Cherokee Horn System Wiring Diagram...
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When the switch S1 / 2 power input to the circuit C1 No. ua741. To a voltage comparison circuit. The pin 3 is the noninverting pin. for pin 2 to pin inverting. The pin 3 was divided voltage from R3 and R4. Used as a reference voltage for comparing the....
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When the circuit is first powered up, neither transistor will be switched on. However, this means that at this stage they will both have high base voltages and therefore a tendency to switch on, and inevitable slight asymmetries will mean that one of the....
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The following circuit shows an Electric Car Audio Project. Features:Rockford Fosgate Punch 4080DSM, Bridged 2 channel at 4 ohms for components., ....
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A common piezoelectric alarm, such as the Murata (Smyrna, GA) PKB5-3A shown, has many valuable attributes. It is compact, lightweight, efficient and reliable. However, the loud, high-pitched sound output can be quite irritating in many applications. The....
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This circuit enables the on/off times of a 555 timer to be independently varied over a wide range. This is not possible with a conventional 555 circuit wi....
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Dc power can also be controlled via fiberoptics. The circuit provides an insulated speed control path for a small dc actuator motor (< Vn hp). Control logic is a self-contained module requiring about 300 mW at 12 V, which can be battery powered. The control....
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This is a Low-Cost Accurate Square-Root Circuit. This circuit is used to provide a square-root function with a good accuracy. The benefit of This circuit is...
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Hey guys, need some help with a project. Im pretty good with 12v electrical wiring but am having trouble figuring this out. Im building a switch panel ....
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e circuit, is a classic circuit of electronic crossover. Stand in for, the circuits of passive crossover that exist in all loudspeaker three way. The difference is in that, it should anymore we use for each loudspeaker a separate final amplifier. Thus for....
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Simplicity and repeatability are featured in this 1 watt S-band amplifier design. The design uses an MRF2001 transistor as a common base, Class C amplifier. The amplifier delivers 1 watt output with 8 dB minimum gain at 24 V, and is tunable from 2.25 to 2.35....
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This adaptor will capture plots or prints of your GPIB instrument to your PC through the serial port. It fills the need of anybody who has a test instrument with the GPIB port and likes to get the screen dump on his PC without any GPIB card. Project based on....
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This is a flash triggered (photo-driven) circuit which produce a pulse with constant predetermined wide. This circuit can be used to control any device which....
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The RF Tester (A3014) is a combination of four circuits. Its purpose is to test several circuit ideas, both by implementing them, and by providing better support circuits for their development. The Modulating Transmitter (A3014MT) replaces our original....
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The circuit is shown as the chart. It is a control circuit which composed of infrared specific integrated circuit KC778B and KC778B is the center of the circuit. It s surrounded by a pyroelectric infrared sensor head PIR, light control and light control....
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The circuit can be tuned to respond to signals between 50 MHz and 500 GHz. The economy model is shown in Fig. 1, and the deluxe model is shown in Fig. 2.The first op amp in each circuit functions as a current-to-voltage converter. In the economy model IClb....
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Electric motor has been widely used as motion control, and many? type of motor controllers? have been designed to provide variable speed drives for the motor..
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A simple battery charger based on SCR is shown here. Here the SCR rectifies the AC mains voltage to charge the battery. When the battery connected to the charger gets discharged the battery voltage gets dropped. This inhibits the forward biasing voltage from....
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Simple instrumentation amplifier circuit diagram using opamp. Equation for gain, design.Working and construction also provided....
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At one of the previous chapters we have learned how to use a transistor as an electronic switch. At this chapter we will see how a transistor can be used to switch another one. At the drawing you can see a pair of cross coupled transistors. S (set) and R....
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The APX9132 integrated circuit, is an ultra-sensitive, pole independent Hall-effect Switch with a latched digital output. A 2. 5 volt to 3. 5 volt operation and a unique clock- ing scheme reduce the average operating power requirements, either a north or....
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This data sheet describes the evaluation board for the AD9834 direct digital synthesizer (DDS). The AD9834 is a numerically controlled Oscillator using a phase accumulator, a sine look-up table, and a 10-bit DAC The AD9834 CAN be operated with Clock....
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The following diagram is the circuit diagram of 20 band stereo graphic equaliser which will controlling the audio signal in specific frequency range. This circuit must be connected before the amplifier circuit. For maximum performance, you may use high....
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If you forget to switch off the light after leaving a seldom used room (such as the loft), there`s a strong likelihood that it could remain lit for months, running up an expensive power bill in the process. How can we prevent this waste It`s not hard for....
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U1 (555 in monostable) creates a square wave signal to matchyour signal. then it sends that square wave into the mixer (u2) along with your original signal to be mixed. so it actually is a doubler. every note you play will have a square wave note of the same....
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Circuit principle: the input signal via IC1-1, and external components of the fourth-order low-pass filter to vary the slope of 24db/oct low-pass processing (figure value fc 70..
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Q3 is an IR phototransistor that responds to a modulated IR beam. Q1 amplifies the ac component of the IR beam. Q2 drives a ..
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The LMH6703 is a very wideband, DC coupled monolithic operational amplifier designed specifically for ultra high resolution video systems as well ....
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Current Transformer H11-3 need be made. Choose not less than 2W transformer core, the first secondary winding. With µ0.12mm enameled wire around 1000 turns. Primary use µ1 ~ 4m..
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A relay, which is energised by pulling the low side low using an NPN. I would like a pushbutton to operate the transistor (and therefore the relay) for a time (500ms ish) then deactivate it and wait for the next push (ignoring the button if held). I....
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Figure 1 shows a classic voltage-to-current (V/I) converter. You can select the resistor values such that the output current in the load, RL, varies only with the input voltage, VIN, and is independent of RL. The circuit is widely used in industrial....
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This circuit has proved very useful in keeping away from a terrace or a porch some bats and other nocturnal animals. You can use it for similar or different purposes. The lamp illuminates for a 4-5 seconds delay and stays off about one minute and 15 seconds.....
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The EAGLE Layout Editor is an easy to use, yet powerful tool for designing printed circuit boards (PCBs). The name EAGLE is an acronym, which stands for: * online Forward- and Back-Annotation * context sensitive help function....
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The circuit is basically a 555 astable circuit that divides two LEDs, LEDl and LED2. LED2 is switched on when the output of Ul is high, and LEDl is activated when its output is low. When Ul oscillates, LEDl and LED2 switch on alternately as the output....
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This fucntion gernerator IC is specified to work to 20 MHz. So far, this unit works nicely to 50KHz. Since I seldom need signals higher than that, it has taken up a happy home on my workbench and further development is iffy at best. There are two basic....
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The cell phone shield circuit uses two NE555 timer ICs: One as being a very simple astable multivibrator (IC2) and then the 2nd as being a monostable multivibrator (IC3). The astable multivibrator has timing resistors R1 and R2 but no timing capacitor since....
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Tests 1.5 to 15 Volt cells. This circuit runs a fast battery test without the need of power supply or expensive moving-coil voltmeters. It features two ranges: when SW1 is set as shown in the circuit diagram, the device can test 3V to 15V batteries. When SW1....
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This is the schematic diagram of 15W inverter circuit. The circuit is based PNP power transistor such us TIP32 and other similar transistors. This inverter is producing square wave, there may be some noticeable hum on audio units which powered using this....
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The circuit protects a solid-state relay from overloads. The circuit limits current, automatically discon-nects the load after detecting a short circuit, and develops a fault-condition output signal. In normal operation, the controlling ptP sets the....
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The purpose of the layout control mother board is to provide a simple way to allow people to control portions of their layout. The layout control motherboard consists of a single microcontroller that interfaces to the MRNet bus and a number of slots into....
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Designs for audio amplifiers with DC coupling to the load are not often encountered these days, even though they offer definite advantages....
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Circuit shown in Figure 240 of the circuit structure is very simple, with only four transistors to achieve circuit from input voltage put large, inverted, and promote the whole..
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500A-6V single-phase power supply circuit Thyristor electroplating It can output DC 500A, 6V (continuously adjustable), for plating processing. VTa single-junction transistor t..
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Microchip has addressed this need with a full line of serial EEPROMs, in a variety of memory configurations, using the industry-standard 2- or 3-wire communication protocols. SDA1 EQU P1. 1 ;SDA=PIN5 SCL1 EQU P1. 0 ;SCL=PIN6 WTCMD EQU 10100000B ;WRITE DATA....
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A very simple dimmer circuit with only the essentials. (In this circuit, the values are given for a BT138 at 220V AC, for 115V AC you may have to experiment with the values. ) R1 can vary from one triac to another, put a 220K © trimmer in its place and....