Popular Circuits Page 275
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This temperature controller operates as a pulse snatching device, which allows it to run at its own speed and tum on at the zero crossing of the line frequency. Zero crossing tum-on reduces the generation of line noise transients. TMOS Power FET, Ql, is....
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This tour, available in Stainless DIL 8 legs, can measure 4 analog voltage independent between 0 and 5 volts, and send the result of this measure in the form of four characters on a standard asynchronous serial link. Its serial output is di....
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This control circuit is composed of the AC step-down rectifier circuit, the astable multivibrator, the timing control circuit, the optocoupler circuit and the SCR driving circuit.etc. As the figure 17-61 shows. The astable multivibrator is composed of the....
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Gain adjustment will be more flexible if it controlled by a voltage signal, since we can use many methods to provide user interface. We can control it by a....
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The following schematic shows the Relay Wiring Circuit Diagram for controlling an Air Conditioner or other higher high-current device from a microcontroller....
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This audio amplifier designed uses two LM3886 per channel, in parallel circuit, based on the PA100 parallel amplifier detailed in National Semiconductors application note - AN1192. This amplifier can deliver about 50W into a 8-ohm speaker and 100W into a....
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Stop watch is made with a digital timer IC LM555 and IC MM74C926 4 digit counter with multiplexed 7-segment LED. MM74C926 consists of4 digit counter, an internal output latch, NPN output for controlling the source of common cathode, 7-segment display and an....
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SK1901 is a semiconductor integrated circuit utilizing the Hall effect. It has been so designed as to operate in the alternating magnetic field especially at low supply voltage and operation over extended temperature ranges to +125. This Hall IC is suitable....
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This PIC microcontroller EEPROM project saves the temperature from an LM35DZ IC to the PIC`s internal long term data storage area. The project follows on from the last project using the virtually the same hardware. It stores temperature readings internally....
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I saw a cool app-note from Maxim that described a gamma-photon detector which used a regular PIN-diode as a sensor. The actual circuit looked simple enough so I decided build it, you can never have too many measurement instruments right?....
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Circuit schematic shown in Figure 1.SCR, R1 and AN SCR trigger switch circuit composed; IC1, R2, VT1, VT2 and BL siren composed of analog circuits. Usually, AN oppression by ho..
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Books presentation general power thyristor trigger circuit are more complex, and some elements hard to buy. I only spend a few dollars made trigger circuit has been successfull..
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Its based on inductive pickup and very easy to install. Have a look at the pic. (remove LED and connect transistor collector to pin4). I hope it will exactly suits to your tachometer...
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Personal Safes are revolutionary locking storage cases that open with just the touch of your finger. These products are designed as secure storage for medications, jewelry, weapons, documents, and other valuable or potentially harmful items.These utilize....
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The article presents a circuit that can be used for indicating the riding speed of a bicycle. The circuit of a bicycle speedometer explained here uses ordinary components like transistors and LEDs and yet succeeds in displaying a distinct 10 step, accurately....
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hey! how to interface a +5V buzzer with IC 89S52. someone suggested me to use two bc547 npn transistor. this is its schematic. buzzer interface.png i....
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I am posting here a circuit example for interfacing RF module using HT12E/D encoder decoder pair. The circuit attached here can be used to transfer data using the RF module. As I have explained earlier RF module mentioned here is having a single channel. So....
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The Bachmann Big Hauler locomotive has improved greatly over the last few years in appearance, reliability and noise level. However one thing that hasn`t improved is the very basic sound system. The system provides a pretty poor facsimile of an exhaust sound....
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In this circuit, a 74HC14 hex Schmitt trigger inverter is used as a square wave oscillator to drive a small signal transistor in a class C amplifier configuration. The oscillator frequency can be either fixed by a crystal or made adjustable (VFO) with a....
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AC solenoid driven control with SSR principle is shown in Fig. The switch is closed SW1,220V AC transformer through the transformer T to AC 30V, the QL crossing barrier..
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The simple indicator presented in this article may be combined, in principle, with any circuit that contains an LED bar display driven by a Type LM3914 IC. It ensures that an LED will light when all LEDs driven by the LM3914 are out. This prevents one....
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This circuit will be useful if you have an electret microphone that produces a low audio (sound) level and you want to connect it to an amplifier or something like it. The circuit boosts the microphone output voltage to obtain an acceptable signal level.....
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Pushing the button once will energize the relay. Pushing the same button a second time will de-energize the relay. Any simple momentary action push-to-make switch will do...
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An AC triggered switch for low frequency signals. This is a basic ac voltage operated switch made from discrete components. Both Q1 and Q2 work as common emitter amplifiers, but the biasing of Q1 is arranged by R3 and R4 so that about 0.5V is applied to its....
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This circuit has been designed to alert the vehicle driver that he has reached the maximum fixed speed limit (i.e. in a motorway). It eliminates the necessity of looking at the tachometer and to be distracted from driving.
There is a strict relation between....
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As shown for the common addition circuit. Figure (a) is the inverting adder circuit, an input-output relationship is: Vo - (Vil + Vi2) When you need to phase addition, the circ..
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Our strategy was based on our ability to traverse complex, tape ridden terrain in the most efficient way possible: with superior speed. Even though we only went for goal #1, which was the lowest scoring goal, by acting quickly and finishing the game early,....
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The TA1284FN is TV Tuner IC which integrate mixer / Oscillator for VHF and CATV bands, mixer / Oscillator for UHF band, and IF Amplifier on a single chip. Supply voltage of 5 V helps lower power dissipation from the set. Compact 16-pin SSOP makes the Tuner....
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Using just four transistors and six resistors, this circuit provides switchable, constant-current drive for an LED and indicates both open- and short-circuit fault conditions (Figure 1). And there`s a bonus, too. Control signal VCONT switches the LED on and....
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The Audio Research Corporation LS22 Line Stage Preamplifier was chosen for this upgrade....
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IC1 is a 555 timer in astable mode, sending approx. 10 ms pulses to decade counter IC2. IC2 is continually reset through R3, until pin 15 is taken low through the "Fire" button. IC2 then sequences through outputs Q1 to Q7, to feed power transistors TR1 to....
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H-bridge is frequently used to control DC motors and stepper motors. When controlling a bipolar stepper motor, two full H-bridges are needed. There are many H-bridge ICs (like L298, MPC17529 and SN754410 which is a quad half H-bridge) for just that purpose.....
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Circuit shown in Figure 3-120. If the motor capacity is small (less than the rated current 5A), it can use an intermediate relay (contact a few more) instead of the contactor. ..
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The circuit is intended for 117 Vac ± 50 Vac operation, but can be easily modified for higher or lower voltages. It measures true (nonreactive) power beingdeliveredto the load and requires no external power supply. Idling power drain is only 0 W. Load....
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This circuit is a simple two transistor (2N2222) FM transmitter. No license is required for this transmitter according to FCC regulations regarding wireless microphones. If powered by a 9 volt battery and used with an antenna no longer than 12 inches, the....
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This afternoon I have returned to 10m WSPR. There are lots of transatlantic reports of my signal, as well as reports of my 2W signal from Russia and Brazil. Sackville Gardens springing into bloom - Sackville Gardens is one of too few oases in Manchester city....
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The comment on using the existing phono connector was to not really change anything at all. Just replace the electrolytic and paper caps, add the 3-wire line cord and use the radio as-is. The selector switch on the radio probably has an "Aux" or "Phono"....
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For the 2 layer board schematic, we`ll use 6 core IC`s: 4 74LS164`s and 2 555 Timers. The schematic will be built using Eagle Layout Editor since all the parts I need exist in their library. The final schematic can be seen below, click on the picture for the....
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Focus on measuring low-level, HF circuits with a return loss bridge ” topics such as using the bridge for antenna matching are omitted and readily found on the web. This web page contains minimal text and just relies on simple diagrams and photographs to....
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The RC transmitter uses a potentiometer for each axis, it acts as a voltage divider sending a voltage of 0. 5V (the middle position corresponds to 2. 5V) to the analog input that is converted into a pule of 1. 2ms that is sent over RF. This module converts....
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The eyes of the switch control system allow the microcontroller`s "brain" to know where the trains are located on the layout. This insures that only one train is on the main line at a time and that the switches are set so that the train returns to the proper....
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A simple oscillator which may be used for code practice. In order to have sufficient inductance to produce an audio frequency, an iron core transformer such as used in audio transformer-coupled amplifiers is hooked up as shown...
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In this circuit, audio fed to the control channel is amplified and rectified by Dl and D2. This dc level activates LED D3 via Q2. The light from D3 causes R9, a light-dependent resistor to decrease resistance. As Rll (audio gain) is set higher, more audio....
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In case the robot being on the black line, it will always go ahead, and in the case of out of line and fall into a white area, it will determine whether to correct to the left or right, and thus remain on the black line. The sensors that will be used is the....
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This Hi Fi stereo preamplifier ambit is congenital with TDA1054 IC from SGS. TDA1054 is a 16-pin DIL amalgamation and integrates 2 abstracted preamp circuits. It is a low babble preamp with little or no botheration in the architecture process. The aboriginal....
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This circuit features automatic exit and entry delays - an optional instant alarm zone - an optional intermittent siren output - and an automatic reset. By adding external relays you can immobilize the vehicle and flash the lights. The alarm is set by....
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This circuit uses standard components and shows a method of indicating the fuse status of mains powered equipment while providing electrical isolation from the mains supply. A standard miniature low power mains transformer (e. g. with an output of around 6 V....
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The amp is rated at 100W into a 4 Ohms load, as this is typical of a "combo" type amp with two 8 Ohm speakers in parallel. Alternatively, you can run the amp into a "quad" box (4 x 8 Ohm speakers in series parallel - see Figure 5 in Project 27b, the original....
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The opamp Wien-bridge oscillator provides a nice view into classic oscillator design using feedback analysis. Feedback analysis reveals if your circuit is stable (well behaved) or unstable (may oscillate). When designing amplifiers (especially high-speed....
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The microcontroller board is shown (top left/green board) along with the auxiliary board (bottom left / brown board) and the two geared Hurst stepper motors. In this view of the microcontroller board the programming jumper is in the upper right area. Power....
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The LM317T is an extremely common positive voltage regulator - many laboratory supplies and other equipment are based on it. It can produce any amount between 1. 25V and up to 35V by adjusting the resistance (opposition to current) between its adjustment pin....
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Timing interval is initiated by applying power, and is determined by RT-CT. At end of interval, unijunction transistor triggers silicon controlled rectifier, to apply essentially full supply voltage to load. Delay range is from 0. 4millisec to 1 minute. -....
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That circuit protects the overdriven signals going into an amplifier.
Instead of a zener diode we use a transistor.
That way we ensure that the above the ordinary input voltages ( 1 volt r.m.s.) can be acheaved without distortion.
Also the use of a....
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Multiplexed displays are electronic displays where the entire display is not driven at one time. Instead, sub-units of the display (typically, rows or columns for a dot matrix display or individual characters for a character orientated display, occasionally....
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PLL (Phase Locked Loop) can be used to make a FM demodulator. PLL circuit track the input frequency by controlling a voltage input of a VCO (Voltage-Controlled....
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A very useful switch that can be controlled from any channel on the typical Futaba or JR radio set up. The switch was designed to trigger the shutter on digital cameras without the encumbrance of a servo glued onto the camera. However, apart from aerial....
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The circuit consists of little more than a few coils, a step-up power transformer, and a capacitor. Power from an AC wall receptacle is fed to transformer T1 (a small neon-sign transformer) which steps the voltage up to about 3000-volts AC. The stepped-up....
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There are many low power SSB rigs and kits don`t have any real speech processor circuitry, although there is a built in speech processor in most modern HF..
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It is very rugged and reasonably power amplifier circuit that can be used for any audio applications. The amplifier produces 60W rms at 50V supply on a 8 Ohm load. The circuit is designed such that most of the components are not critical and can be easily....
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Many passive field strength meters have appeared in the past, typically using a 50mA analog meter movement if reasonable sensitivity was to be obtained. T....
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I built the Electric Scooter,E-Bike PWM speed controller circuit. I can not get the oscillator to work. I checked the pc bd and is ok All resistors....
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The Cmos 4001 has four - independent - two-input NOR gates. The four gates are divided into two pairs. Gates 1 & 2 are wired together to form a type of latching circuit. When the alarm is triggered - they will latch - and sound the buzzer. Gates 3 & 4 are....
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The working of Negative Resistance Oscillators,Types like Dynatron,Tunnel diode oscillator, their characteristics and circuit diagram is explained....
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Battery Volt Meter Circuit Diagram. Here is an ideal circuit to monitor the voltage level in Lead Acid or Tubular battery. It gives four LED indications to give the voltage level between 9 volts and 14 volts ..
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This circuit shows about Bi-Directional Motor Control CIrcuit With NE555 IC. Features: 12V DC power supply, IC is used to control the relay RL1 ....
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In electronics, filter circuits are basically employed for restricting the passage of a certain frequency range while allowing some other band offrequencyinto the further stages of the circuit. A high pass filter circuit will allow only the frequencies which....
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Here`s an inexpensive electronic circuit that you can build to put in your Jack-o`lantern. It provides power to drive a few LEDs at night, and automatically turns them off during the daytime. It`s a simple and automatic dark-detecting circuit that you can....
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In the actual device the transistors are bolted to the aluminium case. The schematic diagram shown here represents how the circuit would be built if all components were on-board. Separate paths for load current and voltage sensing allow the battery voltage....
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The Air Flow Sensor Circuit describes about sensing air flow using micro controller PIC16C781. Air flow is detected by the cooling effect of air ....
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How to make a simple kirlian effect camera for photographing high voltage corona around objects. Otherwise known as aura photography....
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This circuit uses the TDA2040V which is a monolithic power amplifier IC intended for use as a high quality, class AB audio power amplifier. Typically it provides 22W output power into 4ohm with 0.5% distortion, from 32V supply. The device is designed to....
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The high voltage section of the CRT is unchanged from the original vacuum tube oscilloscope used as the basis of this design. The CRT requires shielding from the main power transformer. Cold roll steel around the CRT does not provide enough shielding from....
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In this project, you will make a simple low-power broadcast-type circuit, using a crystal oscillator integrated circuit and an a collector modulated AM oscillator. You can connect the circuit to the an electrec microphone (pointed out in gray on the diagram)....
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Circuit connection as shown in a, b, in which a star-shaped FIG winding shunt capacitance of the connection, Fig. B triangular winding capacitance in parallel connection. FIG W..
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It takes a 32. 768 kHz IR input and outputs a logic low when the input is present. I see 3 distinct stages. everything up to U1A, everything between U1A and Q3 and everything to the right of Q3. I follow the left and the right. but not the center which is....
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Circuit diagrams for both a Bosch and a Delco-Remy Starter-Generator (yes, the circuits are different). Unfortunately, due to a computer crash, I lost both the diagrams and his E-mail address. However, I was able to recover the E-mail and the diagram in May....
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PWM is a highly efficient control scheme used to manipulate the flow of power through various electronic devices. I have seen it most commonly used in switched-mode power supplies, LED dimming circuits, and variable speed motor controls, but there are....
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The 555 adjustable timer circuit starts timing when switched on. The green LED lights to show that timing is in progress. When the time period is over the....
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I was excited when I found VRbot - a voice recognition module, that has several interesting functions such as Without hesitation, I bought one of the module for my experiment. The module size is about 1" x 1 3/4". The company provides a free download GUI....
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As shown in FIG audio circuit is commonly used in color television, TA8218AH pin functions and reference voltage: Pin 1: 1.9V-- inverting input Pin 2: 2.1V - R-channel audio si..
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The LM3909 is configured so that the frequency of oscillation is dependent on a single RC timing circuit, which consists of..
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The RF module, as the name suggests, operates at Radio Frequency. The corresponding frequency range varies between 30 kHz & 300 GHz. In this RF system, the digital data is represented as variations in the amplitude of carrier wave. This kind of modulation is....
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Tone control circuit is an electronic circuit which is designed to manipulate the tone of audio signal. Tone of audio signal is analog to color in light. We....
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Circuit of a digital volume control using six discrete ICs, including a 5V regulator, is presented. IC1 (555) is configured to function as astable flip-flop. Its frequency or period may be adjusted by proper choice of resistors R44, R45 and capacitor C6....
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This circuit serves as an ultra-low power replacement for multiple LED on-off indicators. It also has the advantage of being easy to read in full daylight. With the parts shown, it is possible to display four bits of information.
The display that I used....
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High quality, noise free, wireless FM transmitter/receiver operates over standard power lines. Complete system is suitable for high-quality transmission of speech or music, and will operate from any ac outlet anywhere on a one-acre home site. Frequency....