Popular Circuits Page 260
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The PS10 saves board space, improves accuracy, eliminates Optocouplers or level shifts and reduces overall component count by combining four Timers programmable input UV/ OV supervisors, a programmable POR, and four 90V open drain outputs. A high....
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Switching power supply whose output voltage is appreciably lower than its input voltage has an interesting property: the current drawn by it is smaller than its output current. However, the input power (UI) is, of course, greater than the output power. There....
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The STI5211 is a standard definition, full back-end processor for satellite set-top boxes, compliant with ATSC, SMPTE VC-1, DVB-S2, DIRECTV, DCII and ARIB BS4 specifications. It provides very high performance for low-cost SD systems. With its enhanced....
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The cireiilt is built around a couple of low-cost ICs: an H11C4 optoisolator/coupler with an SCR output (Ul) and an LM3909 LED flasher (U2). It is connected to the phone line in the same manner as any extension phone. A ring signal on the telephone....
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Originally, the prime harmonics were generated with 74HC4046 PLLs which were spot-on accurate but would take some time to reach their final frequencies, especially when running at low frequencies. They also limited the useful frequency output range and I....
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BC517 Bipolar Stepper Motor Control Circuit Diagram. Features: Each winding can carry a positive current, A bipolar motor has two windings ...
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A wide rage auto turn OFF timer covering 1 minute to 20 hours in three ranges with S1. As soon as power is applied to the circuit the IC1 [555] starts to oscillate happily and feeds clock pulses to the IC2 [4017]. The IC2 [4017] and IC3 [4020] give a....
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LM4880 is a dual audio HiFi amplifier IC from National Semiconductor. This headphone amplifier circuitis specifically designed to produce high quality audio output with a minimum amount of components. LM4880 integrated circuit capable of delivering 250mW per....
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The amplifier of circuit, use negative current feedback. So, the load current depends mainly from the input signal and no so much from the impedance of loudspeaker. The inductor current of loudspeaker develop above in the R7 a voltage. This voltage is drive....
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Using a single 555 Timer IC and a small transformer to generate a high voltage, this circuit will test zener diodes of voltage ratings up to 50VDC. The 555 timer is used in the astable mode, the output at pin3 drives a small audio transformer such as the....
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The µPC8211TK, µPC8215TU, and µPC8226TK are silicon germanium (SiGe) microwave monolithic integrated circuits (MMIC) designed as low noise, high-gain amplifiers for GPS and mobile communications. These ICs are manufactured using our 50 GHz fmax UHS2 (Ultra....
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The project called Digital Code Lock using AT89C2051 ². LCD is used for display and a keyboard is used to input the keys. This project source code is written in C. This a simple project with efficient hacking prevention from Brute Force etc. The basic user....
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Typically a synchronous camera flash (e. g. slave flash) is triggered via an SCR. In this blog post, I will show you a circuit that can be used to trigger a secondary camera flash using an IGBT. Using an IGBT for camera flash triggering has several....
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The preamp circuit is completely conventional, and by necessity is AC coupled throughout. The artificial earth is derived by two resistors (R1 and R2), which will set the "earth" at exactly 1/2 the supply voltage. This is nominally 13.8V in all cars, since....
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The GY4102A is a bipolar, monolithic SPDT video switch
incorporating fast control logic. The analog signal path is
characterised by low differential gain, low differential phase
and low insertion loss, coupled with a ±0.1 dB bandwidth
of typically 100....
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The idea behind a capacitor bank is to charge up as much energy as possible to short circuit that energy through small coils, aluminium paper, steel wool, wire and a lot of other things that can conduct a electric current. The short circuit current is....
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The capacitor consists of two sheets of aluminium foil. Leave the foil inside the plastic packets and make connections using crocodile clips. The crocodile clips must not touch each other. The initial frequency of the pulses can be divided by up to 214....
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The circuit uses a 555 timer wired as an astable oscillator and powered by the emitter current of the BC109C. Under dry conditions, the transistor will have no bias current and be fully off. However as the probes get wet the transistor will conduct and....
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No description available...
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The schematic diagram below shows a very simple sample-and-hold circuit using the CA3140 as the readout amplifier for the memory capacitor. The CA3080A is used...
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A very high power and efficiency 100w power amplifier electronic project can be designed using the STK404 audio power amplifier hybrid ICs that consist of optimally-designed discrete component power amplifier circuits that have been miniaturized using....
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This 9-minute timer switch can be used to control the light in a toilet or bathroom. The timer is started by pushing S1 and stopped by pushing S1 again. If you forget to turn it off, the controlled light will go off after nine minutes. If you need the light....
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U1 is a Complex Interface Adapter (CIA). Both parallel ports are used to decode the keyswitches on the keyboard. Parallel port A signals (PA0 - PA7) are outputs. PArallel port B signals (PB0 - PB7) are inputs. A "0" bin is shifted through the parallel port....
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Kids these days seem to have most things you see in the toy shops, so if you have a son or grandson who has a collection of cars, here is something he will really appreciate. And it will be really special as you will be giving something made by you - a set....
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The LT ®4430 drives the opto-coupler that crosses the galvanic barrier in an isolated power supply. The IC contains a precision-trimmed reference, a high bandwidth error amplifier, an inverting gain of 6 stage to drive the optocoupler and unique overshoot....
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Very often when enjoying music or watching TV at high audio level, we may not be able to hear a telephone ring and thus miss an important incoming phone call. To overcome this situation, the circuit presented here can be used. The circuit would....
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Agy used for the first time Lilypad Arduino and LED s on a textile project called Blinky Bike Bag, combining her expertise in fabric hacking with electronics: The bike bag is made from umbrella material to make it waterproof, and I made it with safety....
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This circuit is designed to amplify the input from a telescopic whip antenna. The preamplifier is designed to cover the medium waveband from about 550Khz to 1650Khz. The tuning voltage required is 1 to 12 volts and can be obtained from a 10k potentiometer....
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DW16M-630 type excitation switch operation with DC power and AC power operation of the two, the former circuit is shown in 7-60 J, the latter circuit shown in Figure 7-61: figu..
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The heart of the circuit is IC2, a 50240 top-octave generator. That device uses a single input-frequency to generate all twelve notes of the musical scale. The input signal is provided by IC1, a 4001 quad 2-input NOR gate. Two sections of that IC are used to....
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Schematic Diagramis a layout of symbols and and connection of every electronic components circuit where serve as a guide on how the circuit function or work. Learn how to read it. At first you might think that it is hard to do so, You are not going to be an....
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USB car charger adapter circuit design using LM317 regulator circuit..
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I have built several boards using the bq51013 EVM receiver circuit and a TPS61085 boost converter circuit(designed in SwitcherPRO Design Software) to increase the voltage level to 5. 7Volts. The problem that is that when a load of 580mA(required by end....
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This circuit takes standard 0-10V control voltage (for example from analogue light controlling desk ) and outputs a standard 1-2 ms RC servo motors control pulse. Component How many 100 kohm resistor 2 47 kohm resistor 1 33 kohm resistor 1 470 ohm trimmer 1....
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High power LEDs are quickly expanding their reach as the
lightsource of choice for flat panel computer and TV
monitors, TV projection, signage, portable lights and
automotive interior, trim and brake lighting. The input
voltage and LED voltage....
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Disconnecting the alarm system from the horn relay will eliminate this, but prevent the horn from sounding in the even of an actual alarm. This circuit serves to silence the arming beepyet maintain the alarm by introducing a small delay into the signal. It....
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This is another kit in our self-sufficiency range. We also have a 12v fluoro inverter kit for those who need to operate 20watt to 40watt fluorescent lamps from a 12v supply.
We will be introducing a number of kits for those who have opted to live with 12v....
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This universal filter offers low-pass, high-pass, bandpass, band elimination, and all-pass functions. The Biquad consists of two successive integration stages followed by an inverting stage. The entire group has a feedback loop from the front to the....
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This control, with zero-voltage load switching, uses a CA3130 BiMOS op amp and a CA3079 zero-voltage switc..
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The FDK Multi-750e was launched in the UK in 1981. A 2m ham radio multimode tranceiver, at a good price, and with a matching 70cm transvertor controlled from the front panel. There are still a good number around, but many have stopped working because of a....
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Circuit core device is a dimmer SM7232 specific integrated circuits, which leads to the foot of the eight functions are as follows: 1 pin VDD, the..
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The first thing that you must do, is to measure the end transistors (T3 and T4) amplifying coefficient, the hfe or ². If their disagreement is bigger than 30 %, the amplifier would not give a clear sound. I used MJ3001 and MJ2501 transistors, and this....
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TA1326FNG The TA1326FNG is a UHF band RF Modulator IC that features PLL-based RF Carrier and Audio intercarrier oscillation. The TA1326FNG is compatible with PAL and NTSC Television systems and is lower in cost than TA1243 or TA1297 Series devices. By....
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You need a power supply for a project, but only have a DC adapter available, so you can`t use my AC power adapter trick (Project 05). This little project came about because a reader had just this problem, and didn`t know what he could do..
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Many microcontrollers or PICs will have uncommitted digital-to-analog converter (DAC) outputs that can be used to generate sine waves. But these are generally low resolution (8 to 10 bits), yielding a total harmonic distortion (THD) in the 1% range. Or,....
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This is a simple design for wideband output amplifier. The wideband amplifier is suitable for use as a 50 © transmission line driver. This circuit is built by CA3140. This is the figure of the circuit. This circuit, when used in conjunction with the function....
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A possible source of quiet and limitless energy for submarine propulsion. It will be noted that this hexagonal construction of coils and magnets and two "rotating" sub-circuits has absolutely no source of power. Yet, to the mystified Coler and Dr. Schumann,....
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Two low voltage, low power zeners are used to control electronically the level of an audio signal. The attenuation range is from 6 to 58dB for an input current from 0.042 to 77 mA corresponding to a control voltage from 2.7 to 7.5V. If control voltage is....
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A lot of electronic circuits in the domain of audio amplifiers are already been published here. This circuit is a little different because it is a four channel amplifier. Each channel of this amplifier can deliver an output of 15Watts into a 4 ohm speaker.....
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Excess electrical energy has been discovered in spark gaps using Carbon/Graphite - Thoriated Tungsten rods with a Coefficient of Performance (COP) greater than 100% across the gap. A Wimshurst Generator is used as a primary high-voltage dynamo. A Tesla-like....
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An amplifier to drive low to medium impedance headphones built using discrete components. Both halves of the circuit are identical. Both inputs have a dc path to ground via the input 47k control which should be a dual log type potentiometer. The balance....
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A transverter on a range of 70 MHz. With access to the transceiver KENWOOD TR-751A (144 - 146 MHz), which was already prepared to work with the transverter DB6NT 5. 6 and 10 GHz, ie, output power is reduced to 1 watt, and transfer to the central core of....
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Check out this specialized test gadget that tests continuity quantitatively in both AC and DC modes; it could prove to be an indispensable general bench test instrument....
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This door minder electronic project is based on a 555 timer circuit and uses an IR beam to monitor door and passage-ways or any other area. When the IR beam is broken a relay is tripped which can be used to sound a bell or alarm. This door minder electronic....
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The decimal value of the eight input lines is displayed on three seven-segment displays. Although chips exist to perform this function for single displays, none include the possibility of displaying numbers greater than 9. No EPROM is necessary in this....
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Active power factor correction stabilize the electrical demand of a device to give the best power factor characteristic of many types of loads. To meet power factor regulation, a low cost solution should be designed. In many application, the need of high DC....
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Often a need arises for connection of two telephone instruments in parallel to one line. But it creates quite a few problems in their proper performance, such as overloading and overhearing of the conversation by an undesired person. In order to eliminate....
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A standard serial interfacing for PC, RS232C, requires negative logic, i.e., logic `1` is -3V to -12V and logic `0` is +3V to +12V. To convert a TTL logic, say, TxD and RxD pins of the uC chips, thus need a converter chip. A MAX232 chip has long been using....
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Some RISC controllers, like the NEC V850 family, use an internal 32-bit architecture with an external 16-bit bus. The architecture also allows interfaces with 8-bit memories. However, with 8-bit memories, accesses to and from odd locations automatically....
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Sound mixer circuit of Service This mixer is easy to implement and Expensive as it consists of 2 transistors And some simple resistors and capacito...
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One of the drawbacks of a three-pin voltage regulator is that the input voltage needs to be 2. 5 3 V higher than the output voltage. This makes these integrated regulators unsuitable for battery power supplies. If, for instance, the output voltage is 5 V, a....
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Many modern motherboards are equipped with an infrared data interface compliant with the IrDA standard, but this interface not very often used. However, it is not difficult to build a data transmission module and connect it to the corresponding header. As....
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Protect your valuable laptop against theft using this miniature alarm generator. Fixed in-side the laptop case, it will sound a loud alarm when someone tr....
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The electronic dog repellent circuit diagram below is a high output ultrasonic transmitter which is primarily intended to act as a dog and cat repeller, wh....
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This is a simple how-to guide on making a cheap remote/wireless ignition for a spud gun or other application. It uses a doorbell circuit to transmit an RF signal to activate a relay that completes a 9V stun gun circuit, turning it on. Can be made for less....
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Welcome to the weblog where we discuss about electronic circuits schematics, PCB design, diy kits and electronic projects diagrams. This is just addition 20W audio amplifier circuit, but this time based on the LM1875 audio amplifier IC from National....
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Simple digital frequency meter has many applications. It may be an experiment for beginners, laboratory equipment or a meter built into some device. Ideal wherever there is a need to measure and digitally display the frequency. Circuit The frequency meter is....
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The current task is to design the schematic layout, design the PCB layout, and generate the. contractor with RF schematic design and PCB layout experience Please review the block diagram in the attached. antenna will be connected to the RFOUT coax and an RF....
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The tracer receiver is a stereo audio amplifier/detector circuit operating near 1 kHz. Inductors Ll and 12-hand-wound coils, consisting of 200 turns of #26 wire on 2-inch ferrite cores-are tunea to the operating frequency of the amplifier/detector. The....
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SMASH is the Reference Platinum Simulator enabling truthfully the combination of digital, logic and analog multi-domain modeling as well as Instruction Set simulation (ISS) with no need for a "cosimulation backplane". Each of its successive releases....
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In this circuit, a 74HC14 hex Schmitt trigger inverter is used as a square wave oscillator to drive a small signal transistor in a class C amplifier configuration. The oscillator frequency can be either fixed by a crystal or made adjustable (VFO) with a....
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In order to generate a single note you may try these simple circuits. With only three components you may implement some basic buzzers. You need a telephone earpiece for the first circuit. Any old telephone set has got one of those magnetic earpiece that is....
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This particular circuit was built with an LED Indicator. There are Two LED`s Shown in the Schematic, Both do Exactly the same thing. I was just Playing with it. Advanced Schematic-2 This Modification in Advance Schematic-2 "Will Make this detector More....
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Most homes today have at least a few infrared remote controls, whether they be for the television, the video recorder, the stereo, etc. Despite that fact, who among us has not cursed the light that remained lit after we just sat down in a comfortable chair....
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Frequency-to-voltage converters form part of a wide variety of instrumentation circuits. They also find use in radio as FM demodulators. One interesting configuration for this application is the Diode Charge Pump circuit (DCP), which also doubles as an AM....
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The Sennheiser Dummy Head Stereo recording was a huge breakthrough in the concept of recording at the time. It enabled the reproduction of 3D information as our ears perceive it. The other day I received an email from someone who happened upon this page. He....
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The ICL7107 is a 3 1/2 digit LED A/D convertor. It contains an internal voltage reference, high isolation analog switches, sequential control logic, and the display drivers....
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If the tube is level with respect to gravity, the bubble resides in the tube"s center and the electrode resistances to common are identical. As the tube shifts away from level, the resistances increase and decrease proportionally. Transducers of this type....
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An increasing number of appliances draw a very small current from the power supply. If you need to design a mains powered device, you could generally choose between a linear and a switch-mode power supply. However, what if the appliance`s total power....
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A simple two tone water alarm that is light enough to be worn on the upper arm of a sleeper is described. It uses two LMC555 CMOS timer chips followed by a complimentary pair of emitter followers to drive an 8 ohm speaker. Power is supplied by a 9 volt....
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This circuit will help to filter out the interference signal and ensure that the signal received from the Morse code station stand out. The ....