Popular Circuits Page 128
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As shown, there are two corner frequency: Start frequency attenuation transition of several children F 1/27rC3 (Ri + R2); by the decay into a flat corner frequency, LI. l/2rTC3..
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This circuit bellow shows a teleremote circuit which enables switching ?on? and ?off? of appliances through telephone lines. Can be used ...
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A combination of common-source grounded base amplifier formed by cascaded amplifier The source is grounded and common base amplifier combined into a cascaded amplifier. The gra..
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By using a circuit built with a single analog multiplier and five precision resistors, an output voltage (Ko) can be made to create a second- order polynomial. The circuit implements the quadratic shown. The input terminals of IC1 are connected to create a....
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The light is simply blinking instead of dimming. So I used the following software to just glow the bulb without dimming: unsigned int i=1; void setup() { Serial. begin(9600); pinMode(AC_pin, OUTPUT); pinMode(11, OUTPUT); attachInterrupt(0, light, RISING); }....
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Though some might argue that Serial port are things in the past, it is still the most popular port for those who are into electronic DIY. Building electronic device with serial port interface is cheaper than buiding one that uses USB. That is the reason why....
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The circuit detects a sudden shadow falling on the light-sensor and sounds the bleeper when this happens. The circuit will not respond to gradual changes in brightness to avoid false alarms. The bleeper sounds for only a short time to prevent the battery....
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This circuit allows you to set a limit on the maximum output current available from your PSU. It`s very useful when you power-up a project for the first time - or carry out a soak-test. By setting an upper limit on the current available from your PSU - you....
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A diode (IN4148) is used as a temperature sensor. IC2 is an A/D converter with BCD output. A refere..
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Asynchronous counter shown, this circuit no clock synchronization signal can be used in a random counter or independent unit circuit. ..
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This circuit is not open for discussion. Although working perfectly, it was experimental. I will answer no emails in regards to this circuit.
If you are looking for a more serious and reliable bug detector, go to the Countersurveillance Monitor article on....
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Field bus technology and intelligent instrument technology are automatic and controlling the trade to develop two major most quick technology at present. In the field bus technology, CAN bus line develops a kind of comparatively fast agreement standards,....
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Here is a teleremote circuit which enables switching on and off of appliances through telephone lines. It can be used to switch appliances from any distance, overcoming the limited range of infrared and radio remote controls.
The circuit described here can....
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These "ion chambers" are nothing more than a bare wire stuck through a hole into a metal can! No special gas or sealing is required. For best performance it is probably a good idea to add a desiccant to the inside of the can to keep the humidity low. (I....
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Thermostat electric circuit as shown in FIG. It points to off (off), Lo (low power), Peru HL (high power) third gear. When DIP switch SA to Lo gear, 220V electricity through the diode VD4, VD56 added to the load RL ends; half-wave rectified by a diode so....
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A very regular configuration of the 555 astable timer to work as a timer to trigger an alarm or any other equipment connected to pin 3. R resistor should be replaced with a potentiometer that will change the time delay. Capacitor C should be calculated too....
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The MAX2385 MAX2386 LNA mixer ICs are designed for CDMA cdma2000 1x and GPs applications. The MAX2385 MAX2386 are optimized for the Japanese 832MHz to 870MHz band, and CAN also be configured for the Korean/Chinese/U. S. 869MHz to 894MHz band. To optimize....
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TX05C-R infrared surveillance alarm circuit is shown. It can be used for surveillance of walls, windows, doors and various restricted areas. If someone breaks into or over the alarm position, it will sound to play a security role. The circuit consists of....
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This circuit uses a tricolor LED display to indicate acceptable and unacceptable output voltages. One to set the upper voltage limit, the other, the lower voltage limit. When the monitored voltage is above the set maximum, the LED display turns red. Yellow....
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This is a simple sawtooth generator circuit. The advantages of this circuit are low cost and produces an auxiliary square wave at the same frequency. This circuit can be used to sweep the frequency of another generator. Here is the circuit : A....
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The video circuit illustrated in Figure 1 combines an audio-subcarrier notch filter and group-delay equalization as required by the ITU-470 standard. It also includes an amplitude-adjustment capability for driving an RF video modulator in NTSC applications.....
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his Circuit converts a voltage control output from a Process Controller to be converted into a Current Control if the AC-Drive or Valve needs a Current Control Signal. This is a three wire voltage to current loop converter. The 1-5 V DC is attenuated and fed....
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This shadow alarm circuit can sense a moving shadow in a confined area. It can be used to protect things from theft. When somebody approaches the unit, it will give a loud alarm to abort the attempt of theft. The circuit uses the light sensing property of....
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The bi-directional sequencer uses a 4 bit binary up/down counter (CD4516) and two "1 of 8 line decoders" (74HC138 or 74HCT138) to generate the popular "Night Rider" display. A Schmitt Trigger oscillator provides the clock signal for the counter and the rate....
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High power amps are not too common as projects, since they are by their nature normally difficult to build, and are expensive. A small error during assembly means that you start again - this can get very costly. I recommend that you use the PCB for this....
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Use of ordinary telephone ringing circuit KA2401 and peripheral components, the installation of the light control when the bell..
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his circuit is just an implementation of the 7805 integrated voltage regulator. What this little component does is to lower a voltage and stabilize it by reducing noise and ripple, in order for circuits to have the constant voltage needed to work correctly...
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This schematic is an impruved version of the Pro Maniac Guitar tube power amplifier...
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Build the LC oscillator show on the bottom of this page for some school project and I`m having a bit of problems translating the theoretical circuit into a real-world one. I think I get how the circuit works on paper. We have a LC resonant circuit which will....
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The system is driven by vacuum only, so I started to look through the vacuum hoses once again. I had already exchanged a couple of them last year. I found another two brittle ones going through the firewall to the headlight switch from where a slight hissing....
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NE556 timer can be used as an indicator of static of digital logic audible terminal. Audible logic probe is useful for inspecting a part visually while we also need to check the logic state on other point far from the part. NE556 acts as an oscillator....
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This National Radio Institute radio kit covers the AM broadcast band from 550 to 1700 KHz. The set was designed to be constructed as part of a radio course taught through NRI. In contrast with some other correspondence course kits such as a later NRI....
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The silicon controlled rectifier (S.C.R.) is called as the thyristor. It is like a diode, when the cathode is negative with respect to the anode, the current....
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This is a new circuit I just finished. I like the white LED lighting, it is softer and give a better view without being overly bright for the eyes when you just wake up in the middle of the night. This circuit has no transformer to isolate it, so it is a....
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The circuit will accept a video signal, separate the sync pulses, invert the video, and add new video to the old sync pulses. The video signal is brought in through Jl and applied to a clamping circuit consisting of Cl, Dl, D2,D3, Rl, and R2. The clamp....
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1999 Honda Civic Fuel Injector Wiring Diagram...
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As a piece of test equipment, an audio oscillator has to be considered essential for anyone working in with hi-fi gear. Together with an audio millivoltmeter (as described in Project 16), and even better if you have access to an oscilloscope, you will be....
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Here, S1 and S2 are normally open, push to close, press button switches. The diodes can be red or green and are there only to indicate direction. You may need to alter the TIP31 transistors depending on the motor being used. Remember, running under load....
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IC TA8210AH By using this you can apply a series of audio power amplifier is the car audio system. In general, all the speakers in the car using a subwoofer speaker, and woofer. Because the car is not big room so the sound is being required is not too high.....
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voltage-controlled oscillator. An oscillator whose frequency of oscillation can be varied by changing an applied....
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This regulator delivers 90% efficiency at 12-V input, 5-V output. It uses an LT1158 and LT1431 by Linear Technology, Inc. High efficiency is obtained by synchronously switching two power MOSFETs in a step-down switching regulator...
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Typical QRP receivers include Direct Conversion (DC) and simple Superheterodyne types. These receivers often have quite a wide AF bandwidth which can make inteligiblity somewhar restricted, especially under difficult QRM conditions. Many commercial amateur....
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Many of today`s instrumentation and process control applications convert the analog output of a sensor for processing and/or storage using an analog-to-digital converter (ADC). For voltage input ADCs, three different input structure types exist:....
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Application of the above advantages make it move down 1R 2130 can be easily used for DC cut crossing speed, DC servo system, three-phase power inverter, switching power supply ..
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This generator will supply sine, triangular, and square waves from 2Hz to 20kHz. This complete test instrument can be plugged into a standard 110 Vac line for power. VoVT will be up to ±25 V (50 V pk-pk across loads as small as 10 0 (about 2.5 A maximum....
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find sections such LM5020 Connection Diagram and pin descriptions, the functional block diagram of the device, line Under Voltage Lock Out (UVLO) circuit, an internal high gain error amplifier, a cycle-by-cycle over current protection function, sets the....
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I did some quick playing with the circuit. It is very close to sustaining oscillation. Changing R2 to 10. 5k will cause it to sustain oscillation. The original authors of the note that you reference are no longer with TI so we cannot consult with them.....
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The circuit uses a dual LED. When power is applied to the probe throughthe power leads, and the input is touched to a low level or ground, Ql is cut off. This will cause Q2 to conduct since the base is positive with respect to the emitter. With Ql cut off....
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Twenty-five musical keys and 25 LEDs are provided to denote F to F" with half notes in between. Memory can store a played tune. There are ten preprogrammed tunes (each has an average of 55 note s) masked in the chip. Any tune can be recalled by depressing....
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The oscillator is a standard UHF design which delivers about 10 mW at 1.2 GHz. R1 and R2 bias the base of Q1 to 1.2 V via 12. Collector current is set by R3 to about 30 mA. C2 couples the base of Q1 to the stripline circuit. Tuning is provided by CVl, and....
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A circuit diagram of the crystal startup reliability, power consumption is much lower than the crystal maximum allowed. Q1 is 2N918,2N3564,2N5770, BF180 or BF200. L1 frequency ..
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This simple circuit will energize and de-energize a relay at the push of a button. Any type of momentary action push-to-make switch can be used. Pushing the button once - will energize the relay. And pushing it a second time - will de-energize the relay..
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This is the story of the Fredbox, a rig that first saw the light of day in 1974 in Cambridge. In the last few months it has been restored to full working order to enjoy the renewed interest in AM operation on 2m in the UK. For several years I`d worked local....
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The strategy is to get the circuit going in stages, testing each part as you go. Once everything is wired correctly and can be either controlled or read by the computer correctly, then you can write the main program with confidence that all the pieces are....
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A simple liquid level switch circuit with diagram and schematic.This can also be used as water level switch,fluid level,float level and tank level switch....
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A good while back, I made the 1-key-keyboard project. Ever since it has always been in the back of my mind that the ATTiny microcontroller...
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This project can be used for many different purposes. Probably the most used application would be to interface to any electronic project that requires a keypad. There are several ready made keypads on the market, but those work with matrix connections and....
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The following text describes construction, testing and use of an electronic telephone line simulator of my own design. This self-build project can simulate a telephone call / connection between any two local telephone devices. This for a fraction of the....
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This is the circuit diagram of a very powerful and efficient Ni-MH battery charger using IC LT4060 from Linear Technologies. In addition to Ni-MH batteries Ni-Cd batteries can be also charged by slightly modifying the circuit. For charging Ni-Cd batteries....
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The circuit decreases the size voltage or Stepdown Voltage converter circuit be dc regulated circuit model switching converter. The that make voltage output....
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Using a MC14093 CMOS type IC, a quad 2-input NAND Schmitt trigger circuit can be designed a very simple pulse width modulation circuit controller electronic project. This pulse width modulation controller electronic project is very simple and require few....
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The disk magnets are in attraction on each end of the power coil. The coil is pulse charged, forcing the permenent magnet field to push away from the center of the coil. When the electromagntic field collapses in the coil, the permanent field reforms in the....
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This is my electronic combination lock to use with an outdoor gate. The functionality is implemented in software. It turns on a relay (usually to open a door) for a few seconds if someone enters the valid code. This relay can operate a power-to-open type....
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Used in high-quality stereo cassette deck operating from AC line or battery. Meter rectifier bridge is in feedback loop of opamp, to give highly linear AC/DC conversion with flat frequency/amplitude response and short voltage rise time at low cost. ..
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Two detector systems in the Hall-A spectrometers make use of potentially flammable gasses: the Vertical Drift Chambers (VDC) and the Focal Plane Polarimeter (FPP) straw tubes. This document is intended to address the practical need for a users manual for....
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The PACO C-25 differs from my Healthkit IT-22b in that it tests both regular and electrolytic capacitors as well as using a 40Mc oscillator to enable a rough measure of capacitance using a bridge circuit. Most of the time, with vintage vacuum tube equipment,....
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I tried the circuit below, but i couldn`t make the output.. Plz help me with corrections. In schematic: Resistors - 10k capacitor - I tried both 1uf and 10 uf Diode ....
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Automatic washing machine motor driver schematic It shows the automatic washing machine motor drive circuit schematic. The circle of Narcissus XQB30-III-type washing machine mo..
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The electric fan of remote control is to do a large amount of research and development and production in Pearl River Delta area of Guangdong in initial stage of the 1990s, and there is specialized mask chip that serves as top management chip, I have done the....
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This is a simple XTal tester circuit. T1 and XTal have formed an oscillator. C1 and C2 are voltage divider for oscillator. if the XTal is safe, the oscillator will work well and its output voltage will be rectified by C3, C4, D1 and D2, then T2 will run and....
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This simple dual digital dice is based on three low-cost ICs, a few transistors and a handful of LEDs. IC1a & IC1b operate as an oscillator with a frequen....
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A Center tap 50Hz Step Down Transformer with two diodes is used to get a train of Positive Sine Pulses at 100Hz which is applied to Q6 base via R51. 2N2646 is a unijunction transistor(UJT) in a TO-18 metal package. The control voltage or voltage proportional....
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This page describes the installation and use of a Soundtraxx Sierra sound system. The Sierra worked quite well and was reasonably priced, but time marches on. As of September 2008, the Sierra went out of production and was not replaced by an updated stand....
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Circuit shown in Figure, LD168 is a flash of tape recorders speaker for sound level indication ASIC. It has four outputs can directly drive a plurality of light emitting diodes..
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It uses a transistor control circuit. When the grid voltage is normal, relay KA pull, turn the power load. When the grid voltage is below the minimum allowable value (can be set by the potentiometer RPz), or higher than the maximum allowable value (by RPi....
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836MHz RF2347 low noise amplifier constituting a circuit diagram: ..
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The circuit consists of channel quad amplifier (LM3900). mic audio inputs and direct line inputs are circuit. By adding circuit parallel with this, increase of inputs the applications. input is connected to the inverting terminal of LM3900. The amplifier of....
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This circuit is basically simple and easy to build, it uses two transistors as active components and a few passive components like resistors, capacitors and two LEDs. The circuit makes use of the MPS2222 transistor. You can use any NPN type transistor as the....
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Figure 4-14 is a digital integrated circuit consisting of 16 preset potentiometers Siniperca electronic circuits. It consists of three parts: input into the controller. Presett..
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Using an NEC70083, this 1296-MHz amplifier delivers about 17-dB gain and around 1- to 1.5-dB noise. It is constructed..
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Circuit shown in Figure 3-121. The key component of electromagnetic holding brake is an electromagnetic brake brakes, brake solenoid which is mainly composed of two parts iron ..
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As shown in the circuit diagram of a flash music gyro, which is composed of three end music integrated circuits ICl UM66T19L a variety of colors and light-emitting diodes LEDl ..
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The Arduino system offers an easy and open-source method for programming microcontrollers. Normally this means using a serial cable or USB cable attached directly to the microcontroller project. But what if your project is floating in a weather balloon,....
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Wideband a transmission or communication channel or medium which consists of a wider bandwidth than one voice channel with a carrier wave of a certain modulated frequency and is capable of transmitting more information than narrowband but less than broadband....
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Press SI. The 100 µF electrolytic capacitor rapidly charges up at about 0 V. The transistor will be forward biased, and collector current will flow operating the relay. Release SI. The capacitor will begin to discharge via the 33 K resistor at the base of....
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Well, I guess every hobbyist some when comes up with ideas of controlling or measuring something with a PC. Of course the idea is tempting, there are so many easy-to-learn program languages available for PCs today that almost everyone can write the software....
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The schematic is given below.it would be better if you built it in 3 different parts-like i have done it. The 555 timer circuit: -connect pin2 to pin....
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Digital-ProfiLab was designed for measurement and control applications, combining features like circuit and logic simulation, front panel design, and hardware control to one powerful tool. Incoming signals from external devices may be processed and....
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The lamps are usually used as ballast or electronic ballast inverter. Here it is used to reduce voltage capacitor reactance. Interesting is also the method of ignition of the auxiliary electrodes involved over 150 Ohm resistors. To start simply involve only....