Popular Circuits Page 60
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The schematic diagram of this circuit is shown in figure 3-33. L1 is the schematic symbol for a saturable-core reactor. The control winding is shown with five loops, and the load winding is shown with three loops. The double bar between the inductors stands....
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The capacitor-diode output circuit is used here as a polarity converter to generate a - 5 volt supply from +15 volts. This circuit is useful for an output current of up to 20 mA with no additional boost transistors required. Since the output transistors are....
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This is a project that I started back late 2003 when I just starting to learn PIC programming. I wanted to building something that actually did somthing us....
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Kids like the police or fire-brigade cars siren sound. This circuit can generate dual tone like Police or Fire-brigade cars siren sound. This circuit usually....
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On the 10 MHz fundamental I only measure the HP8562E PN flloor meaning that the TCXO phase noise is better than the spectrum analyzer noise floor. I`ve measured some harmonics from 20 MHz to 1 GHz. There are still measurable harmonics up to 2-3 GHz. 2. TCXO....
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This oscillator circuit permits crystals to be electronically switched by logic commands. The circuit is best understood by initially ignoring all crystal....
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PSU Designer II is designed to help you with the design of simple linear (unregulated) mains power supplies, as often found in tube amplifiers...
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The IC is an alignment-free multistandard (PAL, SECAM and NTSC) vision and sound IF signal PLL demodulator for positive and negative modulation, including sound AM and FM processing. A special function is implemented for the demodulation of FM radio signals....
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The Schematic has three main parts to it. The Sensor Circuitry where the accelerometer is wired up to the A/D converters. The second part is the power circuit where we have the On/Off switch, the 3. 7v battery & +5v 7805 Voltage Regualtor. The 3rd part of....
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The chips that are termed "working well" yield about 300 mV under the beam from a laser pointer and between 40 to 80 mV under the LED light. Voltages around 100 mV were observed in a sunlit room and about 10 mV under fluorescent lighting. Our simulations (....
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A switch-mode power supply provides ±15V or ±12V @ 0.5A output from a 4.5V to 12V input Wide input voltage range allows flexibility to be powered from a regulated DC voltage....
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This high power audio amplifier will give you top class quality for loudspeaker 4 – 8 ohm. Frequency range 20-20000Hz, Voltage 24-36V with current max 5A. You need heatsink to keep the transistor from overheating. ..
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Circuit shown in Figure 3-147. To allow sufficient braking time, using the time relay KT (1 ~ 2s, adjustable), the real on the occasion of a brake stop time may be short. Figur..
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This metal detector circuit needs to be powered using a 9 volts power supply ( DC) or a 9 volts battery .
The C1 capacitor is a variable capacitor with a value of 365 pF , C2 is a 100pF silver mica capacitor , C3 is a 0.05 uF disc capacitor and the C4 is....
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This circuit gives out an alarm when its sensor is wetted by water. A 555 astable multivibrator is used here which gives a tone of about 1kHz upon detecting water. ....
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In the general sense a mixer is basically any circuit that combines two or more circuits or signals into a common output. A more commonly used definition defines a mixer as a nonlinear circuit as one that accepts as its input two different frequencies [F1 &....
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Controlling devices using switches are common. From a few decades controlling devices using remote control switches like infrared remote control switch, wireless remote control switches, light activated switches are becoming popular. But these technologies....
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Connect a 5 way button/joystick to an Arduino using a single analog pin and wanted to quickly simulate it to verify my calculations before I went and soldered everything. The voltages for the six states are 0, 1, 2, 3, 4, 5. The 4V being shown in the photo....
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This circuit is an Electronic Locker. It is controlled by a switches combination (by a code). There is a switch matrix on the door of the locker. This one is a unit of switches connected into 4 arranged of 4 columns for a total of eight terminals. When we....
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In this project we`re going to use use two wires, in this project, we use one red and the other blue, which serve as the touch sensor wires. When a person touches both wires, the circuit is then closed and current runs through the circuit and lights the LED.....
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As shown program uses Linears LT1934 chip production, high cost, high overall efficiency of the electricity load circuit design is less demanding, there are a lot of adjustment..
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LTC1043 and LT1013 dual op amps are used to create a dual instrumentation amplifier using just two packages. A single DPDT section converts the differential input to a ground-referred single-ended signal at the LT1013"s input. With the input switches....
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Communication systems using spread spectrum techniques, compare to narrow-band systems are more resistant for noises, signal fading, Doppler effect. Because of code division of signals (CDMA) we can more effective use frequency band and we can increase....
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The first versions operated from ±15V supplies, featured bandwidths of 50 MHz, and delivered slew rates in the low hundreds of volts per microsecond. Today`s fastest amplifiers run on ±5V supplies with bandwidths of 1. 4 GHz and slew rates of 6000V/ µsec.....
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The modem off indicator is intended especially for serious Internet surfers. It will be seen that the circuit of the indicator cannot be much simpler, or....
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This lie detector circuit described eally give two readings: one for the difficult questions and one show subject general emotional state. As electrodes can be used two flexible wires, uninsulated wrapped around the fingers or wrist. Each change of....
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This is a circuit that will go off once it detects a certain amount of light. Once the light the circuit is exposed to increases to a certain level, a loud buzzer will go off, alerting us to this. So the alarm will not go off when the circuit is exposed to a....
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As shown, the timing circuit due to the installation of the electronic switch by the F1, F2 and VT1 composed of quiescent current can be reduced to 555 l ~ 2 A. When the power ..
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Sometimes the need arises for a simple, gated, pulsed alarm. The circuit shown here employs just four components and a piezo sounder and is unlikely to be out-done for simplicity. While it does not offer the most powerful output, it is likely to be adequate....
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This is the schematic diagram of Electro-Harmonix Small Stone Phaser guitar effect pedal. The Small Stone is somewhat special in applying Operational Transconductance Amplifiers (OTA s) for phase shift stages rather of opamps with variabl....
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Shown for reducing power consumption ISO103 circuit. For multi-channel synchronous applications Vcc1 current of less than 15mA,..
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This DC Motor Controller circuit will control a 12V dc motor. The system will have three pushbuttons: a START button, a REVERSE button and a STOP button. Initially, the motor must not be running. When the START button is pressed, the motor will run in one....
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The circuit diagram of Automatic head lights turn off circuit has been explained here. This circuit can be installed in a car...
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A time delay relay is a relay that stays on for a certain amount of time once activated. This time delay relay is made up of a simple adjustable timer circuit which controls the actual relay. The time is adjustable from 0 to about 20 seconds with the parts....
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Most cars do not have delayed interior lights. The circuit presented can put this right. It switches the interior lights of a car on and off gradually. This makes it a lot easier, for instance, to find the ignition keyhole when the lights have gone off after....
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This Precision Power Supply is a nice addition on your workbench as primary, or in my case, a supplementary power supply. With zero to 40V and 2A with adjustable current limiting it will surely gets lots of use on your bench. On average the most amperage for....
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A very good quality and simple intercom circuit using only three transistors. By pressing the switch S2 the circuit will generate ring signals. For making two way intercom make two identical circuits and combine them as shown in diagram 2. The current....
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This small InfraRed Remote Control Tester circuit is used for checking the operation of an infrared remote control unit. The circuit is based on the idea of connecting a piezo buzzer directly to an IR receiver IC. The TSOP1738 integrated IR receiver accepts,....
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If you have access to a Lowe HF-225 shortwave receiver, then you might be interested in this page. If you don`t, then you`d probably be better off leaving now. What follows is a project I completed some time ago, which allows the Lowe HF-225 to be controlled....
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Good information about RF Probe Circuit. You can learn and download RF Probe Circuit online....
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This is a IBM ThinkPad T40 Power control circuit. This circuit based on the MAX1631 IC. MAX1631 IC is a Multi-Output, Low-Noise Power-Supply ....
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This nifty little circuit lets you record your phone conversations automatically. The device connects to the phone line, your tape recorder`s microphone input, and the recorder`s remote control jack. It senses the voltage in the phone line and begins....
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The 8-bit 2x1 multiplexer consists of 16 tristate buffers and a static inverter. It is designed so that when the select bit is low, 8 of the input bits are sent through tristate buffers to the 8 output bits, and when the select bit is high, the other 8 input....
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AM radio built around 555 timer chip. The only active device (silicon, germanium, or otherwise) is the LM555. The tuning is accomplished with an inductor and a capacitor, and the LM555 acts as an AM demodulator and class-D power amplifier to drive the....
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used to select modes of operation, the accelometer is used to generally move the snakearm while the hall effect sensors are designed to enable ....
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Men in particular enjoy the convenience of television remote controls often to the annoyance of their female partners. Men apparently want to know what they re missing when the TV is tuned to a particular program, so they like to keep zapping to other....
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This is a The Directly (DC) Coupled Amplifier circuit. This circuit is built from NPN transistor and PNP transistor. This circuit is used to amplify a DC....
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The range of frequencies for the FM broadcast band is 90MHz (MHz = Megahertz or 90 million cycles per second). Because the FM microphone has a variable tuned circuit, it can be tuned to a quiet spot on your local FM broadcast band for the best reception.....
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This is a simple JFET input buffer that goes into a clean boost based on the old Electro-Harmonix LPB-1 Linear Power Boost. The guitar input is buffered and then split off to four input points. These input points can then go on to various other modules in....
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OpenAVL is an AVL (Automatic Vehicle Location)open source project.The OpenAVL is one of my on-going open source projects. This project is written in ANSI C. The prototype board is made up of a low cost GSM M2M module (MC39i) from Siemens/Cinterion, a GPS OEM....
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After (years) of mucking about with this, I finally put together a really slick tach that I`ve had in use for a long time. PCBs are available to experiment with, the source code and schematics are open, the code is well tested and mature, so what are you....
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Hi, I am trying to use a Panasonic microwave inverter for a project I am experimenting with. I have limited knowledge with electronics but I can work....
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If you need a typical circuit for any applications such Mobile phones, MP3 players, Portable electronics and etc using SSM2602 Low Power Audio Codec, we provide you with this SSM2602 Applications Circuit Schematic..
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A long time ago when telephones were so simple almost nothing could go amiss from an electrical point of view, Telecom operators installed surge protection on all telephone lines exposed to storm risks. Paradoxically, now that we are hooking up delicate and....
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A switching voltage regulator circuit shown in the schematic diagram here can be a low cost solution for your high efficiency requirement electronic circuit....
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This is an image Schematic. No Description available...
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This is a ring-modulator which doubles as a tremolo. It was designed as a replacement for the somewhat over-complicated ElectroHarmonix Frequency Analyzer with its ridiculous high-voltage wall-wort and huge metal box. I've got it down to a 3080 OTA and a....
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The infrared remote-control tester uses a sensitive PN-type solar sensor that is connected directly to a Darlington amplifier made up of transistors Q1 and Q2. Biasing is provided by R1 and PI, a variable resistor that serves as a sensitivity control. The....
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The the loop antenna L1 for emission also serves as the oscillation coil, the high-frequency current flowing in antenna is synchronized resonance with the oscillation frequency, so it is always in the best emission state. Accoring to practice, launching....
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This circuit is a simple buzzer circuit and it called novel buzzer. It only uses a relay in series with a small audio transformer and speaker. The relay will...
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A TTL logic probe is an indispensable tool for digital circuit troubleshooting. Various methods can be used to design a logic probe. The most common designs employ opamps, logic (OR, NOT, XOR) gates, and transistors. The circuit presented here uses NAND....
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Ml00 circuit from the point of view, it is a typical tube circuit. It's preamp, input-stage amplifier stage are Cape through common cathode amplifier TAIL inverter stage, the last stage power..
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This circuit is able to take you to the world of the Wild West. For this it uses the integrated 18-pin IT82207 (IC1) of Holtek, which literally takes care of everything. You have to do is add a few accessories, including a loudspeaker and six selector....
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Here is a simple and effective circuit for driving florescent lamps from a 12 V supply. The circuit is nothing but consists of an oscillator, a MOSFET switch and a step-up transformer for driving the florescent lamp. The IC1 TLC 555 is wired as an astable....
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We have adopted the one-chip computer, utilize the advantage of the one-chip computer to design this survey meter. This survey meter can read out the resistance quantity measured from LCD display screen directly, the measurement limit is 10 2. 9999k, can....
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This schematic in very simple and easy to made. The IC produces all the sound effects, the output at Pin 3 being amplified by the transistor. A 64 ohm loudspeaker can be substituted in place of the 56 ohm resistor and 8 ohm loudspeaker. The 2 pole 4 way....
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Each time a pulse is applied to the conversion of the control input, Ql resets the 1000 pF capacitor to 0 V. This action takes 200 ns to reset the falling edge of the convert command pulse, the capacitor begins to charge linearly. In exactly 10 microseconds,....
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This Korean SuperCap OEM has support for such use in series. Do you intend to do this manually or automatically like a smart battery charger or simply a power fail backup circuit. You need to balance the voltage and protect from reverse polarity and over....
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Here is a remote operated spy robot circuit which can be controlled by using a wireless remote controller. It can capture audio and video information`s from the surroundings and can be sent to a remote station through RF signals. The maximum range is 125....
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This web page is provided to offer assistance and information to anyone that is wanting to construct a Tesla coil. I encourage you to make use of the other resources we offer on this page. I live in the United States, and in this country the electrical line....
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Circuit shown in Figure 3-81. The circuit uses a transistor delay circuit to achieve start-stop cycle control. You can take the hand moving and automatic manner. Circuit is pri..
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The voice recorders entry information can be stored for 100 years, repeat 100,000 times, power consumption..
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As shown in Fig pulse-width detection circuit. The detection circuit by the differential circuit (R2, C2), amplifier BG1, single stabilizing circuit (555, R1,..
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In typical push-pull driver applications, the npn-pnp transistor pair is alternately turned on and off using a square-wave signal. A simple driver circuit uses an inverter between the V1 and V2 inputs to toggle the output transistors. However, mismatched....
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A balanced output mentioned, people tend to immediately think of the positive phase amplifier output terminal increases 0P amplifier as the inverting amplifier circuit, normal ..
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Simple high efficiency Colpitts oscillator. In the higher frequency ranges, above 50 MHz, Colpitts oscillators are used because stray circuit capacitance will be in parallel with desired feedback capacitance and not cause undesirable spurious resonances that....
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This encoder can transmit the state of up to 16 TTL digital inputs using an RF or infrared transmitter. When enabled, the included modulator automatically generates the 38kHz IR carrier. Containing a PIC microcontroller, the circuit is very flexible. You....
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A continuity tester is handy for checking that there is an electrical conducting path between two points. The following circuit has the advantage that it is very sensitive and it gives both a visual and audible indication of continuity. An audible tester is....
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ISL83202IPZ is a sub package of ISL83202, If you need see the description, please click ISL83202. If you need ISL83202IPZ`s datasheet, please download it from below. By Intersil Corporation ..
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The Fuel and Temperature gauges as used in the 1960 - 1965 Ford Falcon are very basic instruments whose operating principles seem to have gotten lost in this modern day era of digital electronics. In order to properly troubleshoot the circuits you will need....
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The term VCXO stands for Voltage Control Crystal Oscillator. The frequency of such an oscillator can be adjusted by a small amount through changing the control voltage. VCXO CLK generators have been used in various applications, such as digital T....
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Hi, this is my first post here. For the past few days I`ve been building a tape delay unit. Mechanically, it works well, but I still need to design a circuit to link all the parts together. This is, however, beyond my current level of ability, and I was....
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With this whistle light switch you can turn on and off the lighting installation. The main part of this circuit is the UM3763 IC, produced by UMC. The piezo-ceramic buzzer is used here as a microphone and when it receives a tone frequency between 1. 2 kHz....
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A single zone alarm circuit with entry and exit delay and other facilities. The circuit features automatic exit and entry delays, timed bell cut-off and system reset. It has provision for normally open and normally closed switches and will suit the usual....