Popular Circuits Page 231
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This circuit, using a minimum amount of parts generates a 10Hz sine wave [based on the component values shown]. The active components are generic devices and may be substituted as required. The passive component values set the frequency and should only be....
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This is easy to install to the usual system. You have to find a wire which has a voltage in position `1` and then
You cut that wire. After that You install the "ADAPWIPE" between the break of wire
just like the circuits diagram....
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VTTC (Vacuum tube tesla coil) is a Tesla coil with vacuum tubes as a switch. I used self-oscillating circuit with two russian (soviet) tubes GU-81M connected in parallel. The source of high voltage are two MOTs (Microwave oven transformers) connected in....
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The circuit is more deserves to be called Evaluation Board AT89C2051 and AT89C4051. Some of the advantages of circuit Minimum System AT89C2051 / AT89C2051 and AT89C4051 Evaluation Board which I was present this time, hardware-hardware support below:..
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The schematic for this project really only consists of adding a single 5mm LED to one digital output port on the Arduino. The picture below should be fairly self explanatory for how to do it. The main parts in the schematic are the Arduino Uno, 5mm LED and....
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This device is used as a reminder to take medicine every day. This device actually contains a crystal watch and a 4001 quad 2-input NOR gate with two of the gates (IC1a & IC1b) wired as an RS flipflop. The watch is set to "tablet time", usually mornings,....
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Combination of IF amplifier, audio compressor, tunable audio filter, and audio output system operates from single supply. Compressor and filter each use N5558V dual opamps or equivalent units. Tuning range of filter is about 500 to 2000 Hz. IF input goes....
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This audio noise filter circuit is a bandpass filter for audio frequency band. It filters unwanted signals that are lower or higher than the audio frequencies. It has 2 filters: a low pass filter and a high pass filter in a cascade configur....
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The accurate, high-side, current-sense circuit in Figure 1 does not use a dedicated, isolated supply voltage, as some schemes do. Only the selected transistors limit the common-mode range. The circuit measures the voltage across a small current-sense....
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The function of this circuit is to sound a buzzer, or, optionally, actuate a relay, when a certain moisture level is detected between a pair of probes. The circuit has a memory` in the form of a flip-flop, IC1a-IC1b, which enables or disables a tone....
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Sensitive systems, such as those in aircraft, must withstand fault conditions, thereby avoiding component and system damage, because a sensor failure could cause a catastrophic event to occur. A channel protector, comprising two n-channel MOSFETs connected....
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As shown in the external audio spectrum display circuit, high-end audio equipment are generally audio spectrum display apparatus can keep abreast of both instantaneous playback..
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As shown in a practical single-tube constant current charger, which play a constant role transistor VT1, its current value is determined by the voltage regulator and R2. Genera..
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Although a hold feature is standard on most new phones, a lot of us still use the origional bell phones. Those of us that require a hold feature will find this circuit very useful. It is easy to build, and is compact enough to be installed inside the phone....
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Converters and data sampling: Figure 27-47 12-bit A/D converter AD574 and 8031 to the interface circuit. Parameters measured by the multi- way switch after CD4051 strobe to sam..
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Before power is applied, the input and output are at ground potential and capacitor C is discharged. On power-on, the output goes high (Vdd) and C charges through R until V is reached; the output then goes low (Vss). C is now discharged through R until Vn is....
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This is a simple one-valve irrigation controller made for our greenhouse. The code contains a software real-time clock (RTC) and a multiplexed 8-digit LED display and keyboard you can use in other projects. The operating software is simple, it contains a....
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The orange lines indicate the positive voltage and the yellow lines indicate the negative voltage, also known as ground. You can do the wiring by soldering components directly to wires, or use a small bit of perfboard/circuit board. To ensure this thing....
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As I was developing my IR Extender Circuit, I needed to find a way of measuring the relative intensities of different Infra red light sources. This circuit is the result of my research. I have used a photodiode, SFH2030 as an infra red sensor. A MOSFET....
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Hey everyone. I am building a keypad lock for a project using a PIC and one of those passive keypa with 8 pins, 4 input 4 output. Each of the pins corresponds to a row of numbers on the 4 by 4 keypad, and the 4 output pins correspond to the numbers in that....
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Circuit Description: Transistor can amplify the input signal. Then two diodes clamp distorted output, high-frequency noise is 500 pF capacitor filter out from the circuit. Unde..
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While switching a power amplifier on, a loud thump sound is heard to sudden heavy discharge current through the speaker at the time of power on. This current may damage the speaker, especially in case of direct coupled amplifier...
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A battery is a vital element of any battery-backed system. In many cases the battery is more expensive than the system it is backing up. Hence we need to adopt all practical measures to conserve battery life.
As per manufacturer's data sheets, a 12V....
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This is a successor of the PIC16C71 4-digit LED f-counter & V-meter. Some hard to find parts used in the previous version, which are out of production for some time, has been omitted. A rather early PIC16C71 has also been replaced by 28-pin device PIC16F876.....
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As shown in Figure 555 is the transistor characteristic curve tracer circuit depict transistor characteristics, to have two voltages, one step wave is applied b pole for genera..
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The circuit diagram of a simple capacitance meter using IC LM2917 is shown here. The LM2917 is a high gain monolithic frequency to voltage converter IC from National Semiconductors. Even though the main application of LM2917 is in tachometers, it can be also....
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Bistable circuit at the operating frequency of 100kHz or less ..
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Schematic diagram in hard copy relating to the compurter CSIRAC. Schematic diagram shows the detailed connections between all the components in a circuit. They are used to build the circuit and later for testing. For CSIRAC, the most common components were....
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Many battery powered devices use two AA alkaline cells. Often you will not know when it is time to replace the batteries until the device powered by them actually stops operating. The hobby circuit below can be connected to a 3v battery, to give you some....
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Hello everyone, this is my first post here. I am building my first circuit (outside of class) and am having trouble tuning my radio. What I have: So....
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This is a schematic diagram of general-purpose audio frequency (AF) amplifier circuit. This circuit uses cheap 1/4-W resistors, no high precision needed so....
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The EUA2032 is a high efficiency, 2. 5W mono class-D Audio Power Amplifier A new developed filterless PWM modulation architecture further reduces EMI and THD+N, as well as eliminates the LC output Filter reducing external component count, system cost, and....
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Most universal radio receivers have a very wide bandwidth that is not particulary for radio amateurs. The better models with narrower bandwith are almost a....
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For those who never heard about supercapacitor, you can check for more info about supercapacitor here. Supercapacitor is basically a capacitor with very high capacity, and the capacity rating is normally around few Farads. With the super capacity, it....
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I am planning on doing an s-video and rca jack mod on my Genesis. The mods I see done seem to all use the headphone jack as the source of the stereo sound. Is this the only way? I would prefer to have the output not be controlled by the volume slider. Is it....
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In this application, an AD652IC is used in a synchronized V/F converter that derives its input from th..
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This time it is using the IC made by National Semiconductor the LM2662M. This is a direct replacement for the MAX1044 just it is a surface mount part (so it is a lot smaller). I have also changed the main voltage regulator to the LM7805ACT, more on this....
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To measure the frequency response of the e-meter, a Wein Bridge oscillator, oscilloscope, and single-ended power supply were used. (Ironically, a bridge oscillator is being used to measure a bridge detector. ) The oscillator uses a TL074 quad op-amp,....
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The mains supply can be conveniently reduced with no heat dissipation by the reactance of C1; then rectified by D1 (1N4007) and D2 (1N4007) and clamped to 24V....
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The circuit is based on application of National Semiconductor. First is constituted by three voltage regulators LM338 [IC1-2-3] connected ``in parallel` `. The each one regulator has the possibility of giving 5 A in his output. Also exists the possibility to....
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For maximum range, the receiver must be designed in the same manner as a radio receiver front end, since the received signals will be similar in both frequency component and in amplitude of the photodiode current. The major constraint on the receiver....
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The clock is based around a the PIC16F877 microcontroller from Microchip Technology Inc, which performs all of the logic necessary to decode the MSF signal and show the time on twelve 7-segment displays...
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This circuit employs the popular and easy to find LM3914 IC. This kind of IC is quite very simple to drive, requires no voltage regulators (it features a built in voltage regulator) and can be powered from almost every resource. Once the test switch is....
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The power that is used for realignment is a loss as far as the rest of the circuit is concerned. Because of this hysteresis loss in the saturable-core reactor, the power gain is relatively low. A rectifier added to the load circuit will eliminate the....
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By varying either Rl or R2, the oscillator frequency can be adjusted over a narrow range. The R3/R4 ratio sets the second amplifier's gain to compensate for signal attenuation occurring in the phase shifters. The circuits can be driven from an external....
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The first two inverters contained in IC1 are used as audio amplifiers. IC1A amplifies consistently the signal picked-up by the small electret-microphone and IC1B acts as a band-pass filter, its frequency being centered at about 1. 8KHz. The filter is....
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The transceiver mixer and carrier oscillator in the band-imaging (7- and 14-MHz) CW transceiver. Careful selection of ..
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Circuit shown in Figure 3-165. Start-up time by the time relay KT control. Figure, Hi is the power indicator, H2 for the start lights, H3 for the running lights. ..
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This simple circuit that can be used to flash incandescent lamps up to 10W power rating. The circuit is ideal for making flashing beacons on automobiles and other applications like that. The circuit is nothing but an astable multi vibrator based on Q1&Q2 (....
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VLQC is a quenching circuit designed in our laboratories to perfectly suit the constraints of an array, i. e. high compactness, cross-talk avoidance and low afterpulsing. In VLQC a single transistor performs the sensing, quenching and reset tasks drastically....
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This headphone buffer is based on Greg Szekeres' MOSFET Headphone Driver. It is a robust and reliable zero feedback, class A circuit. [Editor: And like the Szekeres MOSFET amp, this amp has unity voltage gain. Therefore, the audio source must supply adequate....
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Described here is a specific module using CF8865 switching power supply circuit, because this circuit is the use of integrated control module CF8865 specific modules. In the fi..
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Project Manager Jim Heck G3WGM has given an exclusive audio interview to the TX Factor s Bob McCreadie G0FGX which explains what the tests are all about and the potential problems. Membership of AMSAT-UK is open to anyone who has an interest in amateur radio....
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Police Siren circuit diagram. This circuit produces a sound similar to the police siren. It makes use of two 555 timer ICs used as...
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Circuit shown in Figure, T is auto voltage regulator. Its output fixed input end by a servo motor to automatically adjust the output remains constant. Transistor VTl, VT2: 3DK9..
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Voltage is applied to the chip via pins 14 and 7 so that when power is applied to the project, the high and low frequency oscillators will come into operation to produce a wailing sound from the piezo.
The high frequency oscillator is the only tone sent to....
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This is simply (4) 1N4148 diodes connected in series with a thermal anticipation resistor (R1) heat shrunk together at the end of a (3) wire signal cable ”it is visible on some of the photos. The use of a thermal anticipation resistor is an old HVAC....
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There are many ways to create a stereo effect. If you were miking a piano, a string section, or some other large sound source, you`d probably stick up a pair of directional mikes and assign them left and right. But what if you want to "enlarge" a lead....
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The common clock oscillator in Fig. 68-19A has two small problems: It might not, in fact, oscillate if the transition regions of its two gates differ. If it does oscillate, it might sometimes oscillate at a slightly lower frequency than its equation....
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Driving Circuit: the driving circuit shown in Figure 18-12. Driving portion is connected to the microcontroller and the air conditioning operation member of the bridge. Microco..
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This circuit is a 10-LED spinning wheel that "clicks" as the wheel passes each point. The rotation starts fast, then gradu..
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The FM Remote Control Receiver` (available on this website in Infra-red circuits section) has a connector where an analogue output is made available. To make a simple intercom or P. A. system the associated transmitter needs a microphone pre-amplifier that....
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Radio-frequency schematics (also see. ne602 datasheet and application note,.This page contain electronic circuits about Electronic RF receivers Circuits. This index has a wide collection of RF receivers, that can be....
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Unlike BJTs, thermal runaway does not occur with FETs, as already discussed in our blog. However, the wide differences in maximum and minimum transfer characteristics make ID levels unpredictable with simple fixed-gate bias voltage. To obtain reasonable....
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This handy, pocket-size mobile transmission detector can sense the presence of an activated mobile phone from a distance of one-and-a-half metres. So it can be used to prevent use of mobile phones in examination halls, confidential rooms, etc. It is also....
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Analog switches alternately pass, off the input signal by the low pass filter to make pulsating flow smoothing (removing pulsating become DC). OP Xiao Ai is an enlarged buffer ..
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This is a page of analogue interfaces for joysticks. Although these interfaces have been developed for use with 4QD`s controllers they will have plenty of other uses. Also because of the development history, we have printed circuit boards available (either....
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Constant current charging circuit long delay Shown as a long delay using CD4541 constitute constant current charging circuit, suitable for Ni-Cd batteries. When the power is turned on after, CD4541 @ pin output high TWH8778 electronic switch is turned on, the..
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This light alarm schematic circuit is designed using some common electronic parts, as you can see in the circuit diagram bellow. This light alarm schematic circuit project will sound as soon as the drawer is opened and light falls on the Darlington....
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Dimming function opens up a completely new family of CFL applications Compact fluorescent lamps (CFLs) are replacing incandescent light bulbs at a rapid rate due to their....
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The circuit in Figure 1 uses the
MIC2545A-2 and the MIC2778. The MIC2545A-2 is a programmable
current limit high-side switch that is capable of
having current-limit up to 2.5A...
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This small amplifier was intended to be used in conjunction with an electric guitar to do some low power monitoring, mainly for practice, either via an incorporated small loudspeaker or headphones. The complete circuit, loudspeaker, batteries, input and....
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Increased sensitivity gives field strength reading from low power transmitters. Operating range 3-30 MHz..
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The voltage reference circuit described below, is a special implementation of current source LM334. Characterized by a very small temperature coefficient metatholio output voltage and consumes only 10uA room temperature. This current fluctuates by a few uA,....
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Because of their speed, accuracy, effectiveness, and cost, infrared (IR) digital thermometers have replaced traditional mercury thermometers. Using a thermopile sensor, an ear digital thermometer measures the infrared heat of the eardrum, which reflects the....
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BA313 is a built-in automatic level .png">control circuit (ALC) of audio recording preamplifier circuit, commonly used in the cassette..
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How to change the brightness of aLED Whether led lights are dimmable Is it possible to adjust the brightness of LEDs LED is basically a diode, when the forward voltage exceeds 0. 7 volt, it starts to glow, and if the forward voltage is less than 0. 7 volt,....
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In a lot of cars, the car-radios use amplifiers that their output power does not exceed the 5W with enough distortion in the limits of power. The problem is untied with the utilisation of external amplifiers, that will have the possibility giving much....
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The interface allows data to be saved on an ordinary tape recorder at a speed of 2400 bit/s. The serial stream of data Fig. 1 (A) is coded with a clock of 2400 Hz (B), by means of XOR gate IC 1/1. Logical "high" and "low" appear as shown in Fig. 2 (C). These....
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Sometimes you have to do it the hard way, even if doing it the easy way is an option. That is the case here. The intention is to add a second doorbell in....
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This week was spent completing a number of different objectives. Firstly, the software was downloaded to design the schematic for the circuit to be translated onto a PCB. Much of the week was spent doing tutorials and learning the user interface to make a....
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Twilight Lamp Blinker circuit can be built with LDR and single IC circuit diagram with parts list of twilight lamp blinker various project using LDR and many more...
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About one Watt RMS seems to be a convenient size, and this is also about the highest power that a simple amplifier fed from 12V can put into an 8 Ohm speaker. A very low saturation amplifier may go as high up as 2 Watt, but any higher power requires the use....
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The IC is a quad 2 input "AND" gate, a CMOS 4081. These gates only produce a HIGH output, when BOTH the inputs are HIGH. When the key wired to `E` is pressed, current through R1 and D1 switches Q5 on. The relay energizes; and Q5 is `latched on` by R8. Thus,....
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XinuPhone promotes hands-on interactive learning that is both cross-discipline and application oriented. As a research tool, XinuPhone is a versatile and open-source platform useful for benchmarking experimental methods against industry standards.....
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The circuit presented is experimental, and should provide some fun to build and play about with. It has been built and tested, and works very well indeed. Please note that it is a low current Class-A opamp, and is incapable of driving low impedances. The....
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The crime prevention bell device that I produced about 20 years ago works still in the active service. It worked many times to make the thief not operate well and not go into it. The bell keeps ringing generally though the bell rings as for the crime....
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I made an hbridge using TPS2836 and CSD16404. The schematic is shown below. It does not work properly and I have a few questions about it. It would be great if you can point out where the design is wrong. 1. I gave a VDD-GND of 5V and tried to give the....
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This circuit using power mosfet IRF840 for 60 Watt linear amplifier. The IRF series of power transistors are available in various voltage and ....