Popular Circuits Page 102
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This versatile 741 operational amplifier module can be used for making a dark detector using an LDR, a photo transistor and a photo diode. The amplifier has been configured in inverting mode. It compares the change in voltage at pin 2 with the reference....
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This is a constant current source using a FET. This is the most simple replacement to series resistor to limit current. The N-Channel FET BF256C can give 15mA current. Before you get to use chips, experiment with some methods, which will help you learn about....
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A low-voltage demonstration Tesla coil using a solid-state photovoltaic relay to replace the conventional spark gap has been analyzed and then built. This relay incorporates an isolated LED to illuminate a silicon photovoltaic stack which drives a....
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Make a signal generator from easily obtainable parts. Square wave, variable frequency, variable pulse width. This can be used for many things such as DC motor speed control, lamp or LED dimming, Transformer drivers. Ignition coil circuits and other high....
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Transistors Q1 and Q2 form a buffer, providing the probe with a reasonable input impedance. Q3 and Q4 form a level detecting circuit. As the voltage across the base-emitter junction of the Q3 rises above 0,6 V the transistor turns on thus turning on Q4 and....
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I chose the Nexus 4 as these devices are traditionally very open, as you can see in case of the Nexus 4 e. g. by the availability of Ubuntu Touch images. I didn`t expect however for it to be that hackable as I was about to find out on Saturday. I had just....
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This is the circuit of waveform generator. Waveform generator is very useful in electronic experiment and design. This circuit is generates sine wave oscillation, but actually we can modify the circuit to generate triangle or square wave function. This is....
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A Universal Power supply based on the L200 regulator, which includes an outboard pass transistor to boost output currents up to 4 amps...
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For normal use it`s necessary to connect the battery, when the jumper is connected.
Please take care, that the transmitter is on and the throttle is set to "power off"...
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If you want to build one yourself, you have to get two audio transformers which have 1:1 transformation ratio and greater than 1 kohm impedance. There are high quality audio transformers in the markes that meet those specs, but those can be quite expensive.....
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L1, L2 Wires of coper (smaltwme`na) with diameter 0, 4mm wrapped in plastic support of diameter 6-7mm of perjstrofjkoy` core. For the L1 you wrap 13 coils. For the L2 you wrap 4 coils. (As in the receptor CB. ) ANT1 Aerial for CB (For the trials is enough a....
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Figure 1s circuitry meets the discussed requirements. It
signal conditions a commercially available clip-on current
probe with a precision amplifier to provide 1%
measurement accuracy to 10MHz. The clip-on probe
provides convenience, even in the presence....
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Here we introduce a kind of 30W micro switch regulated power supply composed of TOP224Y, its circuit is shown in the diagram. Its feature is using TL431 to replace regulation tube VDz2 in the sampling circuit. That is, it can reach the technical target of....
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A potentiometer is controlling the firing point of the triac. Capacitor C4 is charged via resistors R3, R4, P1, and R5. After a certain time, dependant on the potentiometer, the charge contained in C4 is large enough for the dimmers diac D to start....
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As a keen cyclist I am always looking for ways to be seen at night. I wanted something that was a novelty and would catch the motorists eye. So looking around at my fellow cyclists rear lights, I came up with the idea of `NITE-RIDER`. NINE extra bright LED`s....
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A biquad filter is a type of linear filter that implements a transfer function that is the ratio of two quadratic functions. It is available in low pass, high....
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This project involves the construction of a low-cost curve tracer that is suitable for testing a wide variety of electronic components both in-circuit and out of circuit. It is easy to construct and extremely useful for finding defective parts, especially....
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It provides much quicker turn-on when the Sun goes down. Note that a smaller value for the resistor will provide faster turn-on; the trade-off is that a smaller value for the resistor also makes the solar engine less efficient at charging the capacitor....
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The circuit diagram of the circuit variable regulator, which uses IC L200, as regulator of voltage and current, IC For this comes from the company ....
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It operates by PWM (Pulse Width Modulation) - well, actually by PFM - Pulse Frequency Modulation. At power up, C1 charges up via D1 and R1. R2 will conduct, pulling the base of the emitter follower, Tr2, up and feeding gate voltage to the MOSFET. Tr4.....
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User Agrement & Disclaimer Disclaimer All files are found using legitimate search engine techniques. This site does not and will not condone hacking into sites to create the links it list. We will and do assume that all links found on the search engines we....
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An electromagnetic field probe designed to detect changing electric and magnetic fields. The probe has switchable gain, a frequency response up to 400kHz and independent audio and meter monitoring. This EMF probe uses an inductor to locate stray....
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Is the battery empty, or is there something wrong with the device That`s always a difficult question when your walkman or some other battery-powered device appears to be dead when you switch it on. Before you take it to the shop for servicing, the first....
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A highly-stable 60-Hz sine wave can be delivered with this circuit, which offers a different and much simpler approach to gaining a stable amplitude...
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I`ve re-drawn it to appearance the Colpitts oscillator added clearly. L is about 1. 5 uH; 19 turns in a T50-6 amount (yellow). The amount of C6 is begin experimentally. I acclimated 69 pF (a 47 pF and 22 pF in parallel). Added about this during check-out. L....
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This article explains how to add 32K external crystal/clock source to Atmel AVR micro controller Atmega8 with circuit diagram & C program....
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Stepper motor is a simple way to make a motion control with high precision. A stepper motor control circuit is needed to make stepper motor works. A stepper....
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If you ever get tired of trying to remember the subtleties of the "carry" status bit every time you want to use the subtract instruction to perform a comparison, the macro in Listing 1 can help. The macro contains all of the nuances, once and forever. The....
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This article describes an I-V curve tracer circuit that uses a computer for display and control. The circuit is controlled via the PC parallel port. Software is provided, written in BASIC, to control the measurement and display the results on the monitor.....
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A fun package full of potential projects! Development board for 28 pin PIC microcontrollers with power supply circuit, crystal oscillator circuit, RS232 port, ICSP/ICD port, 16x2 alphanumeric Supertwist LCD ....
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This circuit interfaces a standard RC-control to a standard PC game port, see figure 1. The main target was to use the interface for the FMS flight simulator. The interface makes it possible to use a standard RC radio to control the FMS flight simulator....
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This wideband jammer simultaneously blocks all transmissions within a desired band typically by sweeping across the desired band to be blocked, starting at the lowest frequency and ending at the highest frequency of the band. For this purpose a linear....
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This timer is ideal for small aplications. Due to its simple structure, its usage and nevertheless its universal character, this mini timer is usable in the most current applications needing time intervals, from some seconds through approximately 60 minutes.....
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Circuit of the easy to use cedar LM3sDZ temperature detection heir. Does not show adjusted to obtain 1 (hnV/aC output temperature change range if he is 0 ~ so * c, -. The outpu..
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This approach to automatic level control (ALC) makes use of digitally switched audio attenuators in the signal path. The output level of the system is sensed, compared to a reference, and audio pads are inserted via analog switches...
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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 choo....
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A common-base Colpitts oscillator using a pnp transistor as the amplifying device. Notice in this version of the Colpitts oscillator that regenerative feedback is obtained from the tank circuit and applied to the emitter. Base bias is provided by resistor RB....
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The unit is simple to build, and does not need really low noise opamps, since they only act as a modulator oscillator. I used 1458 dual types in the prototype, and they are more than good enough. The transistors can be any low noise NPN type, and they are....
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In this project i have interfaced an GPS with AVR microcontroller, the ATtiny2313 gets the location from the GPS and display it over the LCD display...
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This project is based on integrated circuit from Holtek Semiconductor HT6221/HT6222. Similar parts used to be produced by NEC Semiconductor uPD6121/uPD6122. These ICs are commonly used in television and VCR infra red remote controls, garage door controllers,....
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When the receiver is tuned to a M. W. radio station the resulting feedback howl, caused by the transmitter can be set to alter, or appear when the coil and radio are above or near a metal object Here is a pictured of the search head. It is made from a....
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The password electronic doorbell circuit is composed of the trigger circuit and music generating circuit, and it is shown in Figure 3-119. Trigger circuit is composed of the buttons S1-S9, four NAND gate Schmitt trigger integrated circuit IC1 and the....
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CD4069 is a digital integrated circuit fabrication using boron to delay light touch, it also uses j -wire connection force method, it can directly replace ordinary light switch..
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An ac drive controls ac induction motors and, like its dc counterparts, controls speed, torque, and horsepower. A dc drive typically controls a shunt-wound dc motor, which has separate armature and field circuits. This teardown of the Schneider Electric....
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A window detector is a specialized comparator circuit designed to detect the presence of a voltage between two prescribed limits; that is, within a voltage window. This circuit is implemented by logically combining the outputs of two single-ended....
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As shown in the circuit diagram for the LED signal amplification: ..
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Ultrasonic atomizer circuit : How to generate an atomized water mist using ultrasonic sound waves....
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The metal detector circuit consists of oscillator and sound-light alarm circuit, and the circuit is shown as the chart. Oscillator circuit consists of inductor L, capacitor C1, sensor switch integrated circuit IC1 (includes oscillator, detector and....
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I have been looking for information on how to install factory HIDs into an Evo that did not come with HID or fog lights to no avail. Here is something ....
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Crystal X1 is fundamental mode, calibrated for parallel resonance with a 32 pF load. The final output frequency is generated by frequency multiplication within the MC2833 IC. The RF output Buffer (Pin 14) and Q2 Transistor are used as a frequency tripler and....
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This is Power Audio Amplifier circuit based on STK400xx series. It`s will give you very good quality of sound this circuit is unexpensive too since STK40xx series have low price. It is easy we make a power amplifier using only few external components. The....
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Nixie tubes were used for numeric - and sometimes alpha - displays back in the days before LEDs and LCDs. They were more light bulbs than tubes, but were encapsulated in evacuated glass shells like vacuum tubes and had round, multi-pin bases like tubes.....
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The circuit uses Ql to buffer the right-channel balance output while Q2 and Q3 form a VOX circuit. When the signal level from the microphone goes high, the output of the VOX also goes high and the multiplexer inside IC1 switches the high-gain left-channel....
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This is Auto OFF Light circuit. After the switch is pressed, the bulb is kept illuminated for a few seconds. To increase the ON time, The 10k should be...
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Here is a simple water level buzzer circuit which can be used to detect or sense the level of water in tank, pool, washing machines etc. When the two probes shown in this water level indicator circuit will detect water the buzzer will start producing sound.....
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This circuit is especially designed for those who often need to wake up early in the morning. Ordinary alarms in electronic watches are not loud enough and very often they fail to wake up. The switch circuit described here will come handy; it can be used to....
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This amplifier circuit combines the LT1010 and a fast discrete stage with an LT1008 based dc stabilizing loop. A differential stage which is single-ends into...
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If you have a power source which will provide 2. 5Vdc at 10uA this circuit should drive a pager motor. It turns on the motor at 2. 3 to 2. 5Vdc and switches off at 1. 2 to 1. 5Vdc. Both Steve and I have built ( bread boarded or haywired) the business end of....
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One of the principal choices in phono preamplifier design is between active (feedback) and passive equalization. The ideal feedforward preamplifier for a moving magnet cartridge would have about 40dB gain prior to the equalizer (more for low-output moving....
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This page exists as a repository for items you may need to consult from time to time, such as identification guides, diagrams, etc. There is also a project in the works to make the S130 fiche easier to navigate and find what you`re looking for. You`ll need....
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This 40W fluorescent lamp inverter allows you to run 40W fluorescent tubes from any 12V source capable of delivering 3A. This is basically a larger version of the 12VDC Fluorescent Lamp Driver and can be used to light regular or blacklight tubes...
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This project takes advantage from -HOLD input, which is connected to push-button P1. As long as the -HOLD input is low, truth table's timeouts have no effect because this input serves to disable any state change provoked by timers. The effect is to freeze....
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This audio amplifier showed in this circuit diagram, is a very simple and efficiency audio amplifier circuit based on the TDA1308 integrated class-AB stereo headphone. The device is fabricated in a 1 mm Complementary Metal Oxide Semiconductor (CMOS) process....
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The 2 X16 Parallel LCD is an 8 bit or 4 bit parallel interfaced LCD. This unit allows the user to display text, numerical data and custom created characters. The LCD uses the HD44780 series LCD driver from Hitachi, or equivalent controller. The LCD is....
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I`m having issues simulating this circuit on Proteus. Please take a quick look and make sure I did`nt make a goofy mistake. I`m also a novice with....
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I`ve been doing some CW contesting with my K2 and N3FJP`s Logging Software and since I now have this modern rig with computer control and everything I wanted to connect it up to my old Thinkpad and use the serial port for rig control and the parallel port....
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DW15-200-630A breaker solenoid DC solenoid structure, short-time working. (1) DK-1 control box using AC power switch on the electromagnet circuit circuit is shown in Figure 6-7..
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Originally Posted by taj Is he perhaps more accommodating than his reputation portrays? ..Todd No....
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This "Super Light Sensor" responds to minute fluctuations in light level, auto-adjusting over the range from about 200 lux up to 60, 000 lux (ie, from a modestly lit room to direct sunlight). It has lots of potential uses - eg, detecting a car entering a....
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This miniature transmitter is easy to construct and it`s transmissions can be picked up on any standard FM receiver. It has a range of up to 1/4 of a mile or more. It is great for room monitoring, baby listening, nature research, etc. L1 is 8 to 10 turns of....
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This is the schematic for an FM transmitter with 3 to 3. 5 W output power that can be used between 90 and 110 MHz. Although the stability isn`t so bad, a PLL can be used on this circuit. This is a circuit that I`ve build a few years ago for a friend, who....
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The logic input is applied to opto-isolators Ul and U2 with, respectively, npn and pnp emitter follower outputs. Dc balance is adjusted by potentiometer R2. The emitter followers drive the gates of Ql and Q2, the complementary TMOS pairs. With a ±12 V....
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There will be many times where it is desirable to use the P05 supply module from a higher voltage source. For example, if you want to add balanced inputs....
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Building a practical and usable direct conversion receiver for the 40 m CW band is not as simple as it might appear. Broadcast station signals from the adjacent 41 m band, will easily overload most direct conversion mixer designs with their unwanted (and....
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Charging circuit by the transformer Tl, diode VDI-VD4 and other components, 220V AC by Tl buck, VDI ~ VD4 rectification, CI smoothing filter into DC power to charge the battery..
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Do not try this circuit unless you have good knowledge about electronic devices. This circuit is connected to main power source (220V) and can give you a high electrical shock ..
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This transistor based alarm features automatic Exit and Entry delays - together with a timed Bell Cut-off and system Reset. Along with the Exit/Entry zone - the basic alarm board has one Instant Zone. This will be adequate in many situations. However - the....
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For use with low-power transmitters with a positive keying voltage. Q1/Q2/Q3 form a switching amplifier. When the key is pressed, the collector of Q3 goes to ground, turning on Q5 and activating IC1, an audio oscillator. Q4 drives the speaker...
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The modifications involve direct access to the stepper motor controls of your mount. Any "mis-control" or "mis-command" / "invalid parameter" or "garbage" data sent to the mount could accidentally activate the stepper motors and allow it to rotate "freely"....
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When building amplifiers, it is often necessary to test transistors, either to verify that they (still) work, or for some esoteric designs it may even be necessary to match certain characteristics.
The design featured here is just what you need, and....
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As shown in FIG OPA111 constituted by the input buffer leakage current measuring circuit. D1, D2 of the transistor 2N3904, which will short the base and collector contact (open..
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It is mainly composed of permanent magnet with the disk, integrated Hall sensor, strobe gate, time base signal circuits, power counting and digital display circuit. Counting and digital display circuit using CMOS-LED digital display component CLlO2, it can....
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A pic programmer circuit that works using long cables from PC to programmer....
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This circuit is used to measure the voltage on a 12V (nominal) lead acid rechargeable battery system. It was specifically designed for use in solar powered systems, but is general enough that it can be used for automotive or other 12V systems. Lead acid....
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This circuit is derived from an application note of L296, It is a Power Switching Regulator from ST. The advantage of using a switching regulator is that there is not much Heat Dissipation in this circuit. If you had to build the same with a series....
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Acquired an old Eistar SJ-1 Digital pulser. However the frequency it generates is always 66% of what its supposed to produce. Turns out that the frequency coming out of the frequency stage(at Pin 11)is 66% of the 16MHz crystal or about 10. 6MHz. (The 74LS38....
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Using only two active components, we can build an AM radio receiver working on MW (Medium Wave) Band. The circuit uses straight receiver configuration, where....