Popular Circuits Page 255
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A Short Wave Receiver based on the MK484 (formerly ZN414) that includes the tropical bands and 49 metre bands....
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3-2, the circuit by the touch electrode, when integrated with the base NE555 made double touch light switch circuit shown in Figure composition circuit and the triac circuit of..
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Since this is a DC circuit, how and where do the + vs. the - wires physically get connected to the circuit Where exactly do I connect all the grounds to I understand all the places where the schematic calls for a connection to the power source. I`m just....
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This is a design circuit for intercom circuit. The circuit comprises a 3-stage resistor-capacitor coupled amplifier. When ring button S2 is pressed, the amplifier circuit formed around transistors T1 and T2 gets converted into an asymmetrical astable....
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The circuit in Figure 1 controls 32 voltage-output channels from the parallel port of a PC. The circuit comprises eight DAC7615 quad voltage-output, serial-data programmable, 12-bit DACs. The controlling PC individually programs each of the 32 DAC channels,....
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Using a product developed for PC-motherboard environmental monitoring, you can configure a low-cost, general-purpose DAS (data-acquisition system) (Figure 1). The DAS can directly monitor multiple voltage channels as well as temperature and frequency. It can....
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The receiver chip uses a Panasonic 4602 38KHz receiver and that's it for external components. It has the serial input (GP3) , two RC hobby servo outputs (GP0/GP1) and three digital outputs (GP2,4,5). Here is the code for the receiver chip. It is a bit of a....
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This circuit was used to stop all the BFO drift. The circuit is extremely stable. Turn the receiver off, and then on at any time and temperature, the BFO frequency is exactly the same. The resonator is a Murata CSB 455E. Murata's series number is CSBLA_E....
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This is a FM Transmitter circuit. This circuit uses logic gates. This transmitter circuit has a RF oscillator. This oscillator uses 10.7Mhz ceramic filter and...
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Dunlop Cry Baby Wah Wah Schematic Still its hard to be the Cry Baby sound for what it is....
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The Bio-Stimulator provides muscles` stimulation and invigoration but, mainly, it`s an aid in removing cellulitis. Tape the electrodes to the skin at both ends of the chosen muscle and rotate P1 knob slowly until a light itch sensation is perceived. Each....
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This Electro Harmonix Big Muff Pi circuit would most likely be better making the change by a contemporary input-jack power and a DPDT bypass switch. The kinds of transistors and diodes are unknown. It really is most likely that any high acq....
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The above circuit is a precision voltage source, and contains a temperature sensor with a negative temperature co?ficient. Meaning, whenever the surrounding or battery temperature increases the voltage will automatically decrease. Temperature co?ficient for....
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The automatic fader drops at the background music while the narration is in place. The control input through RIO, a preset audio level control, into an emitter-follower buffer stage CQI). The buffer provides high input impedance and ensures that the source....
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This circuit is intended for precision centigrade temperature measurement, with a transmitter section converting to frequency the sensor`s output voltage, which is proportional to the measured temperature. The output frequency bursts are conveyed into the....
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Both of these converters use CMOS inverters. Figure 105-1A shows a free-running circuit having both the pulse duration and pulse pause dependent on temperature of the diode D8. It can be used where a synchronization between the converter and something else....
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Here is the circuit diagram of an ultrasonic mosquito repeller. The circuit is based on the theory that insects like mosquito can be repelled by using sound frequencies in the ultrasonic (above 20KHz) range. The circuit is nothing but a PLL IC CMOS 4047....
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A very interesting horn driver project presented by Microchip technology is presented in this circuit diagram. This horn driver project is based on PIC16F886 microcontroller, from Microchip. This microcontroller horn driver circuit diagram is very simple and....
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Plug the diode VD under test into sockets X1 and X2. Stabilized power supply adds reverse breakdown voltage to VD and the stabilized voltage value Uz can be read from voltage meter V, and the stable-working current value can be read from the milliammeter mA....
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With sine-wave input, RCA CA3046 transistor array connected as VCO can be used as low-distortion FM signal generator. With sawtooth input, same arrangement serves as wobbulator. Increasing size of timing capacitor reduces op-erating frequency, permitting use....
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It's a simple metal detector design that has the quite good characteristics. the principle of operation which one differs from the classic schemes (BFO, transmit-receive known as "two-boxes" metal detector, inductive). The dynamic mode is used to find....
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The circuit's operating principle is that if you make a pulse width proportioal to inductance, and keep the pulse frequency and amplitude constant, and then pass the pulse through a low pass filter so that only the average voltage comes out, the resulting DC....
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This circuit is half dozen Band Graphic Equaliser, you can modify sound in low, mid and high that circuit used IC 741 Op-Amp. With this circuit you can management and mix frequencies and tones as desired. The audiblefrequency spectrum is roofed in six steps:....
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The AAT1275 evaluation board provides a platform for test and evaluation of the AAT1275 switching boost converter with USB Power Switch The evaluation board demonstrates suggested size and placement of external components to achieve 5V output voltages and up....
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This invention is a back EMF permanent electromagnetic motor generator and method using a regauging process for capturing available electromagnetic energy in the system. The device is comprised of a rotor with magnets of the same polarity; a timing wheel in....
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Automatic electronic circuit shown in Figure signs, it is mainly by voice circuit, an oscillation circuit and a driving part of the display circuit. ..
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This is the diagram of VHF RF Preamp circuit 100-175 MHz with single chip MAX2633. The circuit can be used for the entire VHF broadcast and PMR band (100-175 MHz) which can be easily construct without any special test equipment. The grounded-gate....
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Schematic for the CMOS Linear Feedback Shift Register Vintage Atari Sound Effects Generator circuit....
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Many noncontact temperature-measurement systems use infrared sensors, such as thermopiles, which can detect small amounts of heat radiation. Biomedical thermometers that measure the temperature of an ear or a temple use noncontact temperature measurement, as....
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A multivibrator is an electronic circuit used to implement a variety of simple two-state systems such as light emitting diodes, timers and flip-flops. The monostable multivibrator will create a condition: in which one of the states is stabl....
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Infrared Remote Control Tester Circuit This is a simple circuit you can build in order to test infrared remote controls. The circuit uses an....
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The AVO VCM 163 is one of the few tube testers (British: valve tester) being able to measure tube electrode currents, e. g. plate and screen current (fig. 1, left-hand meter movement) as well as mutual conductance (fig. 1, right-hand meter movement)....
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The photoflash circuit is showed as above. The seagulls SD - 150 type studio flash combines formative light and photography intense light source also accompanied by advanced synchronous remote control device of inside light modulation, which makes many....
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A tone generator that runs on as little as 1. 5 Vdc, using the Sallen-Key configuration. And finally, I`ll apply the tone generator to implement a phantom powered signal source for testing balanced microphone inputs. Textbooks and web pages usually show the....
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This is the circuit of the amplifier channel stereo BTL 15W audio power IC based on TA 8215 developed by Toshiba. In this circuit, power amplifier, TA 8215 two ICs are used. This is for the acquisition of four channels has two channels of each IC. TA 8215 is....
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The indicator flashes an LED when the battery voltage drops below a certain threshold. 2N4274 emitter-base junction serves as a zener which establishes about 6V on the L161"s positive input. As the battery drops, the L161 output goes high. This turns on the....
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The door opener derives its power from a 9-V battery. A momentary-contact switch, 52, is provided in the event that manual opening and closing is required. Relay Kl is a 9-V type and relay K2 is a 117"Vac latching-type, which automatically latches with....
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I have designed this high voltage, low current power supply for various experiments in systems & synthetic biology. I have cleaned up the design and I am placing the schematic and board layout online below! This circuit outputs up to +1, 866VDC at under 1 mA....
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240W Power Amplifier class D circuit based TDA8924. The chip has a short-circuit proof output, thermal protection and acoustic protection from the inrush current when you turn on and off. The scheme provides two options turn on an amplifier both stereo and....
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This is the main building block of the home automation system. My goal here was to design one circuit board that could be customized for different functions by selectively populating the board, adding daughter boards, and changing the software. Currently,....
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The circuit presented here wakes you up with a loud alarm at the break of the daylight. Once again the 555 timer is used here. It is working as an astable multivibrator at a frequency of about 1kHz.
The circuit's operation can be explained as follows:
When....
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Since high frequency voltage-controlled oscillators, or VCOs, are not easy to construct, Maxim ( has produced an integrated 1. 2GHz oscillator, the MAX2754. The center frequency is set using the TUNE input, and a linear modulation input allows the frequency....
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I have been running it off 12v or so. I find that it works very well. I built it to use with a Ten Tec Eagle, which (somewhat surprisingly) does not have a spot tone or any other kind of zero beat indicator. My only quibble with this indicator thus far is....
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Solid-state relay circuit with input protection of the MOC3011 triac driver. The input voltage to the protection circuit can be 3 to 30 volts DC (courtesy Motorola Semiconductor Products Inc. ). ..
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This application note describes the development and use of a Digital Weigh-Scale (DWS) using Zilog`s Z8 Encore! ® Microcontroller This reference design offers a ready-to-use DWS solution easily scalable to measure high-capacity loads. A high-resolution....
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The purpose of this project is to visually communicate the effects that frequencies have with each other. By expressing these frequencies into mirrors and magnets that have a laser beam shining across creates a visual representation of that electronics is....
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The µA2240 consists of four basic circuit elements: (1) a time-base oscillator, (2) an eight-bit counter, (3) a control flip-flop, and (4) a voltage regulator. The basic frequency of the time-base oscillator (TBO) is set by the external time constant....
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This burglar alarm system circuit is using a infrared proximity detector that triggers an alarm when the rays falling on its sensor are interrupted. It is different from others burglar alarm systems because is a very simple diy project and can offer you....
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This circuit is designed to drive the 1W LEDs that are now commonly available. Their non-linear voltage to current relationship and variation in forward voltage with temperature necessitates the use of a 350mA, constant-current power source as provided by....
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The inverter circuit diagram composed of NE555 is shown as the chart, and it can turn +12V DC battery voltage to 220V AC output voltage. In the circuit, NE555 circuit is the oscillator, the oscillation frequency is decided by the R1, RP1 and C1, and....
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In single phase AC induction motors, often used in fridges and washing machines, a start winding is used during the starting phase. When the motor has reached a certain speed, this winding is turned off again. The start winding is slightly out of phase to....
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Hope, you follow my advice and hack your cheap USB speakers, to get nice ( pre-assembled ! ) analog front-end for this project. If not, than get your soldering iron to work, minimum two resistors and 1 cap would required, assuming you already have display....
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Before we study the working principles of a TV receiver, it is worth knowing a little about the journey of the object image that we usually see on TV. Images that we see is the production of a camera. The object image captured camera lens will be separated....
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This circuit is intended for use in a small private telephone installation. The ringing tone sequence is 400 ms on, 200 ms off, 400 ms on, 2 ms off. In the accompanying diagram, N1 and N2 form an oscillator that operates at a frequency of 5 Hz, which gives....
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Capacitor start single-phase induction motor circuit configuration, in order to form a two-phase rotating magnetic field, starting winding and capacitor in series, the same magnetic field can be formed automatically...
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The MAR6 (MSA-0686, 0685, 0885) is a high performance silicon bipolar Monolithic Microwave Integrated Circuit (MMIC) housed in a low cost, surface mount plastic package. This MMIC is designed for use as a general purpose 50 W gain block. Applications include....
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This circuit operates with 230v. you can use this circuit to decorate your parties. I think this will be a wonderful circuit to you all. This circuit was taken from my old circuit book called 100 circuit book. Here DIAC ER 900 and Triac BTW 11-400...
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This is a single zone alarm - with automatic exit, entry and siren cut-off timers. It will accommodate all the usual types of normally-closed input devices - such as magnetic-reed contacts - foil tape - PIRs etc. But it`s easy to add a normally-open trigger.....
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Here is a simple circuit that can be used to pulse an LED or a low power filament lamp. The effect is such that the LED lights up from OFF state gradually and then dims gradually. Such a circuit is very useful in decoration purposes. The circuit is nothing....
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Voltage fluctuations in the mains are very common phenomenon. These fluctuations can cause heavy damage to costly electronics and electrical gadgets operating for long period of time. For such purpose, an automatic stabilizer is used which is usually quite....
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A sensitive detector for static electricity based around a single Field Effect Transistor It can also be used to detect the presence of negative ions, or test a negative ion generator. This circuit utilizes the extra high input impedance of a FET, and also....
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This article describes a lighting circuit that generates a glowing firebox effect and provides constant illumination forclassification lamps and an interior cab light. It contains all information needed to build the circuit including a detailed schematic,....
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This single-chip circuit adjusts its audio gain according to the ambient noise picked up by the microphone. When ..
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I like to present a Shielding Carpet for shielding Electromagnetic (EM) and Ultrasonic waves. Shielding EM waves is easy. You need to enclose whatever you want to shield by some metal. Faraday cage is a good example. ..
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Later, I will use the same pivot table to list the parts out by each of the 8 phases in the build, organizing them into phase-specific bags O` parts. First thing I notice is that there are some slight disconnects between the liberally illustrated, online....
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Low phase noise voltage controlled oscillator circuit a It shows a typical low phase noise voltage controlled oscillator circuit, which..
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The Geiger tube needs a high voltage supply which consists of Ql and its associated components. The transformer is connected in reverse; the secondary is connected as a Hartley oscillator, and Rl provides base bias. Dl, D2, C4, and C5 comprise a voltage....
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The receiver provides two TV signal, a TV in the living room, another TV in the bedroom, along with a satellite receiver. Watching television in the bedroom for Taiwan convenient, but when watching television in the living room,..
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This is an old version, see the latest version on the documentation wiki. Now you`ve got one of Hack a Day`s Bus Pirates, what do you do with it? Learn about 1-wire, I2C, and SPI EEPROMs with the 3EEPROM explorer board (we pronounce it THREE-PROM, emphasis....
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the left side works fine and i`ve got the left side running lights and brake light to work but not the turn signal I am wiring it right into the harness` and do not want to have to buy the plug in harnes as i need it done asap Ask-a-doc Web sites: If you`ve....
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This is a simple Surround Processor with the degital delay method. This audio processor is not using any special function ICs that difficult to get parsonaly, and desined in only general purpose ICs. Of course the Digital Delay Block of A-D, D-A and delay....
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This is a monostable multivibrator circuit that employs a single op amp. The main component of this circuit is the 741, a general-purpose operational amplifier. A monostable multivibrator is a timing circuit that changes state once triggered, but returns to....
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The test beeper generates a sinusoidal signal with a frequency of 1,000 Hz, a common test frequency for audio amplifiers. It consists of a classical Wien-....
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The password electronic doorbell circuit is composed of the electronic password circuit and music occurred circuit, and it is shown in Figure 3-118. Electronic password circuit consists of integrated circuits lCl and keys Sl-S6, diodes VDl-VD5. lCl is the....
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This circuit was designed for measuring the current from a set of power trackers on the Iowa State University Solar Car, the PrISUm Phoenix. The power trackers provide impedance matching between the solar array and the main electrical bus on the car. Because....
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Circuit This schematic is the power supply and front-end sections of the field monitor that is discussed in more detail at Electric Field Disturbance Monitor. (this link is off-site) The system can detect human and animal motion by the electric fields they....
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The Spartan-6 board has 2x16 LCD, indicated as in Figure. The 2x16 character LCD interface card with supports both modes 4-bit and 8-bit interface, and also facility to adjust contrast through trim pot. In 8-bit interface 11 lines needed to create 8-bit....
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The circuit was meant to be powered by a power supply, which is why there is no transformer, rectifier, or filter capacitors on the schematic. There is no reason why you cannot add these. To use the circuit, hook it up to a power supply/plug it in. Then,....
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BT9404 de-excitation type switch by the CJ4-S contactors and JT3-21/3-type electromagnetic relays. Its control circuit is shown in Figure 7-55. Figure, KM contactors CJ4-S; KT ..
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A few weeks ago, it came to my attention that IKEA do a set of colour-changeable LED strips. I ve been looking for a decent way of providing ....
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This LCD terminal provide two modes of operation by selecting jumper J1. When J1 is open the terminal operate as a normal ascii display terminal, when J1 is closed the terminal displays the input serial data in hexadecimal format. This mode is useful for....
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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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The original version of P05 has been around for a very long time now (around 4 years), and there are some worthwhile reasons for the updates. Although the performance of the original was not lacking in any way, I decided to change to adjustable regulators.....
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These pages describe my project to build simpler and less expensive amateur seismometers by using microprocessors and other new chips, such as switched capacitor filters. I have tried to provide links to much of the excellent information that is already on....
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The following describes the design, construction, operation and use of the Multiple Target Developent System (MUTS). The MUTS consists of a Target board (Target) that can connect to a Silicon Laboratories (SL) Debug Adaptor to program the Target board with....