Popular Circuits Page 17
- Page 17
-
The circuit includes a low-distortion, 1-kHz oscillator and will measure THD at a user selected voltage level for voltage amplifiers, or for checking amplifiers of power levels to 600 W. It will detect THD levels of .005% (-86 dB). A built-in one-percent....
-
-
Two op amps used in a bridge circuit configuration detect high and low light levels. Potentiometer R2 sets the dark level and Rl controls the light level. R3 is set so that about lA the supply voltage appears across R4 at the desired light level. ..
-
MIC5158 constitute the rising edge of the high-speed switching circuit diagram...
-
Power supplies that operate at a fixed frequency have their largest EMI emission at this fundamental, fixed frequency. Emissions also occur at multiples of the switching frequency but at diminished amplitudes. The simple circuit in Figure 1 makes the....
-
The output frequency from IC pin 3 is determined by the voltage input to pin 6. A standard frequency counter can be used to measure voltages directly over a limited range from 0 to 5 V. In this circuit, the 555 is wired as an astable multivibrator.....
-
A car stereo amplifier circuit that can be used in automobiles, designed using Class-B audio amplifier TDA1553, with circuit diagram and schematics....
-
-
The circuit in Figure 1 shows the versatility of the
LTC2418. A combination of single-ended, differential,
unipolar and bipolar input sources are simultaneously
applied to the LTC2418...
-
Input and output (I/O) on the Arduino web server using the SD card. Arduino inputs (analogue inputs, switches) are displayed on a web page. Arduino outputs (LEDs) are controlled from a web page. Uses Ajax for flicker free loading....
-
Dynamic Mic Mid Boost And Bass Rolloff Schematic Photo: dynamic mic mid boost and bass rolloff schematic. taken from documentation of a known working po ....
-
-
-
-
This circuit is identical to the one in the Single Buss 1V/Octave Keyboard Controller. See the circuit description there. This board has the addition of the resistors used in the keyboard voltage divider. Whereas in typical keyboard pressing a key brings the....
-
This is an Automatic LCD Panel Backlight Control circuit. This is a simple low cost implementation of an LED controller. It can compensate for aging effects....
-
The System is fully controlled by the microcontroller AT89S52. It is a popular 8 bit microcontroller. The circuit consists of four switches, in which two buttons are used to increment and decrement the temperature value and the next button is to edit the....
-
This is a simplified schematic diagram for a home-made scanning backlight driven by an Arduino, an open-source electronics prototyping platform. The Arduino monitors the VSYNC signal (input-lag compensated) and executes a backlight scanning sequence, using....
-
The way that this circuit works is as follows. The AC line voltage is rectified by D1 and D2 which connects to a voltage doubler circuit made up of the two 22uf capacitors. The Flash Freq. Pot and the 10uf capacitor charge up which triggers the Diac and....
-
A stepper motor is a motor controlled by a series of electromagnetic coils. The center shaft has a series of magnets mounted on it, and the coils surrounding the shaft are alternately given current or not, creating magnetic fields which repulse or attract....
-
A Bridgeless PFC converter based on a novel switching method eliminates full-bridge rectifiers and helps to reduce the size and cost of switching power supplies....
-
The movement of the servo depends on the output value of the photoresistors. The impedance of the sensors varies with the light that incident on them. The position of the servo always changes toward the sensor with less light. There are four light sensors.....
-
Electronic FM Telephone Transmitter SchematicThe following schematics design pictures is a circuit diagram FM telephone transmitter that built on a PC board layout which is so small it can simply be fitted within the housing of a telephone creating it an....
-
This simple circuit and program listing allows the Maximite microcomputer (SILICON CHIP, March-May 2011) to control a stepper motor. It could be expanded to allow for the control of multiple motors, with four of the Maximite`s external I/O pins used to....
-
Have you ever seen the stairs to one of the upper stories in your house turn into a waterfall Or maybe you`ve come home to find your aquarium fish trying to swim across the carpet For your sake, we hope not, because the consequences are usually fairly....
-
There are battery powered wireless systems on the market, but the ones I found would signal that the door was open even if you left it open just a few inches for ventilation. I wanted a system that would alert me if we`d just plain forgotten that the door....
-
This is a Sine Wave Oscillator circuit. This circuit as known as? amplitude-stabilized sine-wave oscillator. It can gives high purity sine-wave output down to ...
-
-
-
The clock is constructed on two boards; one carries the HT generator and the processor logic, the other the tubes. Thisallows a slightly more compact design that the previous effort, but didn`t save as much real estate as I`d hoped. The tubes are mounted on....
-
-
The saving lamp circuit has the glass cover type and exposed type. Glass cover types have three series of spherical, cylindrical ball, processing type, etc. , the first two series have completely four types of transparent, carving, engraving and white color.....
-
The 74ALS996 part is shown which corresponds to the commercial temperature range, but the 54ALS996 may also be available which would operate up to the military temperature range. Although these parts are always available in the same packages, as the ALS....
-
Two Simple Relay Based Motorcycle Alarms Circuit These are two - easy to build - relay-based alarms. You can use them to protect your motorcycle - but they have many more applications. If you use relays with 6-volt coils - they`....
-
LM 317T power supply circuit. This power supply is very simple and timeless, contain very few components and will give very stable, regulated adjustable / variable output....
-
The alarm/sensor circuit shown is built around two SCRs, a transistor, a 4049 hex inverter, and a few support components, all of which combine to form a closed-loop detection circuit with a delay feature. The delay feature allows you to enter a protected....
-
150 - 210 secs analog delay timer project for control of devices that need to have a minimum off timer before power can resume to prevent damage to the devices ..
-
The circuit is a DC to DC converter using a standard 12 VAC center tapped power transformer wired as a blocking oscillator. The circuit is not very efficient but will produce a high voltage usable for low power applications. The input battery voltage is....
-
-
DIY TDA2050 Non-Inverting Chip Amplifier (chipamp) Project constructed on a protoboard..
-
-
The CA3080 can be used as a gain controlling device. The input signal is attenuated by R1/R2 so that a 20-mVpp..
-
As shown in FIG source constituted by PGA203 programmable instrumentation amplifier suspended. Because the input signal is applied to PCA203 twisted pair inputs, so in suspensi..
-
This circuit controls a solenoid by the operation of a single push-button switch. The circuit will supply loads of over 1 A and can be operated up to a maximum speed of once every 0.6 second. When power is first applied to the circuit, the solenoid will....
-
-
The designer of this circuit had fitted two (waterproof) loudspeakers in his bathroom and connected them to the stereo system in the living room via a long cable. Naturally, this promptly led to the desire to be able to use the remote control unit from the....
-
Quad comparators, type LM339. A flyback DC converter Done. Buck converter Step-up converter Done. that would consume several comparators and maybe there would be some nice LEDs, too. Then it hit me. A VU meter, big, beautiful, professional! From that moment....
-
This small transmitter uses a hartley type oscillator. Normally the capacitor in the tank circuit would connect at the base of the transistor, but at VHF the base emitter capacitance of the transistor acts as a short circuit, so in effect, it still is. The....
-
A cellular rotary phone - the dialing takes forever! And here in Colorado - on a 10-digit dialing system - you don`t dare mess up the number. Where do you even buy a rotary phone these days Oddly enough, there are quite a few phones on Froogle that had push....
-
By repetitively charging and discharging a capacitor through the primary of an induction coil with a high voltage, an ultra high emf is induced in the secondary. Switching is performed by the triac, triggered by the disc at times set by Cl and Rl. With a 12....
-
Counter speeds for CMOS- and TTL-programmable counters are limited to under 100 MHz. ECL-type devices can approach..
-
-
This is a 1-amp variable-voltage PSU. It adjusts from about 3v to 24v: and has the added feature that you can limit the maximum output current. This is invaluable when (for example) you power-up a project for the first time or soak-test a piece of equipment....
-
The high voltage power supply was probably good for 12 to 30 kVDC at 1 or 2 mA. This is useful for many high voltage experiments, plasma globes, negative ion and ozone generators, bug disintegrators, starters for really LARGE HeNe lasers, etc. The devices,....
-
A low power fm pirate radio. The output power is around +35 dBm ( 3. 16 watts) over 50 ohms load and +24 volts power supply. The project consists in a hartley oscillator ( modulated VCO), and tree stages ( Class A, common emitter) of RF amplifiers. The first....
-
Ever accidentally left your front door ajar and had a pet escape Here is a smart solution to this problem. The circuit is fairly simple but a great example of using a tiny circuit to get the job done. All you need is a CD4011 IC plus a handful of components.....
-
Circuit shown in Figure dimmer to 555 as the core component. 555 and R1, RP, R2, C1 composition astable multivibrator, the oscillation frequency f 1.44/(R1 + RP + R2) C1, aroun..
-
Picture three or four small engines occupying the same loop of track and keeping a safe distance as they go round and round. I am sure that many of us have tried this with radio controlled engines but it can be a constant battle to keep them apart especially....
-
This PIC16F877 microcontroller tutorial answers the question, "" How to use timer0 of PIC16F877 and how to handle its interrupts? "" Using PIC16 simulator (P....
-
CRTGND is not the same as GND, CRTGND connects to the mostfet drain/schottky diode. There is a downside to this circuit which is that there is a voltage drop when running from the USB side due to the diode. The USB voltage can vary between 4. 75V to 5. 25V....
-
The SIMD1 V3 is very similar to the NPN flavor of SIMD1 V2, but with the addition of a FET on the output line. This makes life easier for its attached load (since there`s no need here for something that can use an "enable line"), by providing power that`s....
-
Differential amplifier with a constant current source, as shown in Figure 1-27. Thus, as long as, c3 and kept constant, cl, n can not be simultaneously increased or reduced sim..
-
So, after yesterday`s post about The Demon Machine I decided it would be fun to play around with the BBC Micro Model B and so I plugged it in and powered up. The familiar two-tone boot sound played and the machine was on. About 15 minutes after power up....
-
This is a low power voltmeter circuit that can be used with alternative energy systems that run on 12 and 24 volt batteries. The voltmeter is an expanded scale type that indicates small voltage steps over the 10 to 16 volt range for 12 volt batteries and....
-
-
Automatic cycle switch circuit 2 It uses 555 IC as the control element} A capacitive step-down circuit; bidirectional thyristor V control relays or loads on and off time. RPi a..
-
This simple circuit was a presented, it can give power output about 1 watt, when connected to a power supply 9 volt. The advantage of this circuit is that it uses a dual darling ton to increase the size as much as of input impedance about 20 Meg ohm. This....
-
This is a 25 Watt basic power amp that was designed to be (relatively) easy to build at a reasonable cost. It has better performance than the standard STK module amps that are used in practically every mass market stereo receiver manufactured today. When I....
-
-
-
Here you can see that what i did in this circuit. because the resistor on the back side ( which i have soldered) was blown out. so the root of problem was that specific resistor. And in this case, the pattern change switch is on Option 3 i. e on Full light.....
-
that used a SRPP (shunt-regulated PP) driver stage I started to do some research and modeling on a SRPP. The advantages of such a line stage are much the same as those when a SRPP is used as a driver. Good linearity, low distortion, low impedance output,....
-
-
This circuit was constructed to control the pump in a garden pond, so that it automatically turns on at dawn and off again at dusk. Not only does this mea....
-
You can save on your electricity bills by switching to alternative sources of power. The photovoltaic module or solar panel described here is capable of d....
-
Measuring range: room temperature is -10 ~ 40 ?; body temperature is 36 ~ 41 ?; Resolution: room temperature is 0.5 ?, body temperature is 0.05 ?; error: room temperature <1 ?, body temperature <0.1 ?. When S1 is in position 1, it shows the room temperature....
-
Replacing the front-end with a circuit that down-converts VHF signals in the 2m, 4m or 6m bands to HF signals that can be received in the RX`s "back-end" (which is essentially the Ensemble II RX). The parts provided in this kit permit the builder to select....
-
The data separator is intended for use with 8" flexible diskettes with IBM 3870 soft sectored format. The circuit delivers data and clock (B) and clock pulses (D). These two signals must be in such a sequence that the negative edge of the clock pulse is at....
-
Desheng R-202T type two-band radio circuit diagram as follows: ..
-
In order to meet the needs of the control loop, often require electromagnetic relay or transistor relay to accelerate or delay action, from action to constitute accelerate or delay circuit...
-
This homemade metal detector circuit will help you find objects composed of materials with relatively high magnetic permeability. It is not suitable for bu....
-
-
A flashing LED signals the necessity to water a plant, 3V powered circuit This circuit is intended to signal when a plant needs water. A LED flashes at a....
-
After the battery is clipped, because the movement of touch stick will make the light source shine to photosensitive tube, and produce light current, the first level 3DG6 turns on, the emitter outputs signal, the singal is coupled to back level by 10 F....
-
Below is a Courtesy Light Extender for cars. When a door is closed in a car, it extends the ON time, so the passenger can see where he/she is sitting. Here is....
-
A shows a COR/CAS circuit for repeater use. CR1 is a silicon diode. 2 may be any relay with a 12-V coil (a long-life..
-
Afroman covers the basics of how transformers work, where to shop for step down mains transformers, and how to wire one up to mains voltages without killing yourself. European and North American wiring is discussed. He finishes up with a quick example of AC....
-
This design combines power-on and low-battery indication, can operate with any battery voltage up to 15V, has very low current drain (2mA or less) and costs less than $3. 50 with new parts. When the battery voltage is above a predetermined minimum, power on....
-
When VOUT is very low during start-up or a short-circuit fault on the output, the switching regulator must operate at low duty cycles to maintain the power switch current within the current limit range, since the inductor current decay rate is very low....
-
This circuit uses a 1458 dual op-amp to form a radar detector. C1 is the detector of the radar signal. The first op-amp forms a current-to-voltage converter and the second op-amp buffers the output to drive the piezo transducer. R5 sets the switching....
-
-
-
D/A conversion circuit by the DAC0832 and op amplifier LM358, etc., there are two bad-out channel, unipolar voltage output. Digital output range: OO-H FFH, corresponding to an ..
-
This project uses a microcontroller programmed with software that is posted on the Gerns-back BBS at 516-293-2283 as part of RUNABOUT. ZIP. The robot can be controlled via a universal remote control. ..
-
The circuit in the diagram enables a negative voltage to be derived without the use of integrated circuits. Instead, it uses five n-p-n transistors that are driven by a 1 kHz (approx) TTL clock. When the clock input is high, transistors T1 and T2 link....
-
-
By ASIC it is a flashing light string web dig troller, which has four outputs; single key cycle Control 1 6 kinds of tricks, and can choose 16 or section 8 before paragraph aft..
-
The 040904C version of the code has a larger UART receive buffer and supports two pushbuttons that send either and ASCII "R" ($52) or an ASCII carriage Something to keep in mind when using AVR controllers that support 16 bit addressing(specifically, the....
-
Circuit shown in Figure 3-97. The circuit only two contacts, the circuit is simple, but only applies to the following 2kW dual speed motor. Figure, SBi is running at low speed ..
-
This circuit changes the average value of the dc supply voltage because of the high switching frequency. The tungsten lamp will have an almost continuous adjustable light output between 0 and 100%..
-
Prototype 2 uses the same base to control different elements. This time we have added a button to make the tone play only when it is pressed, as well as a rotary potentiometer for volume control. /* ADXL3xx Reads an Analog Devices ADXL3xx accelerometer and....
-
The TDA2549 is a complete i. f. circuit with a. f. c. , a. g. c. , demodulation and Video preamplification facilities for multistandard Television receivers. It is capable of handling positively and negatively modulated Video signals in both colour and....
-
Phase controlled AC voltage regulator, (a) Using back to back SCR and diode and (b) using inverse parallel SCR (c) Using diode-bridge and single SCR Figure 30. Input and output voltage waveforms for input 250V and output 300V. V1(V5): Input voltage- bottom....