Popular Circuits Page 253
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Interfacing LCD Display to Avr micro controllers-Atmega8 and Atmega32 with circuit diagram and code/program using embedded C to download....
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Using just two NAND or inverter gates its possible to build a D type (or toggle`)‚ip-‚op with a push-button input. At power-up the output of gate N2 is at a logical 1`, ensuring that transistor T2 is switched off. When the push-button is pressed the output....
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Hall-effect switches have several advantages over mechanical and optically coupled switches. They`re insensitive to environmental light and dirt, they don`t bind, and they don`t sustain mechanical wear. Their major drawback is that they require three wires....
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Latching is obtained by storing the gate trigger energy from the preceding half cycle in the capacitors. Powe..
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This circuit is able to handle nine independent telephones (using a single telephone line pair) located at nine different locations, say, up to a distance of 100m from each other, for receiving and making outgoing calls, while maintaining conversation....
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This is a ADP1821 Step Down DC-to-DC Converter circuit. This circuit uses ADP1821 that is synchronous pulse-width-modulated (PWM), step-down controller,...
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The heart of this digital volume controller DVC circuit is IC2 4067 , 16-channel analog multiplexer. Because the 1k has been connected between every input and output, the multiplexer can act like a potentiometer. The total resistance is 15k....
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A single chip metal detecor with a range of a few inches. This is useful for decting nails or screws in walls and floors, or for locating buried mains cable. The heart of the circuit is a single IC the CS209A made by Cherry Semiconductor. The detector, is a....
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The block diagram in Figure 1 shows how to make a cable-free, direct-video system. The system allows users to walk from booth to booth at an exhibition to interview people and to display the interviews in real time on three screens at key locations...
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I have received a few emails asking for a transformerless power supply. Here is such a supply. This supply uses no heavy step down transformer and has an extremely low parts count. The circuit can be built very small and can supply small currents for small....
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The ISL62391 controller generates supply voltage for battery-powered systems. It includes two pulse-width modulation (PWM) controllers, adjustable from 0. 6V to 5. 5V, and a linear regulator (LDO3) that generates a fixed 3. 3V and can deliver up to 100mA.....
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The control circuit operates to double from a positive supply, which, when turned on the power of the first door. and goes off when the first drain as shown in FIG. This circuit integrates the LM123, a three-terminal positive regulator and a dc dc +....
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Triode for alternating current,TRIAC, is an electronic component that can control power in two direction in an AC circuit. The figure (a) shows the block...
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Many electronics hobbyists will have experienced the following: you try to finish a project late at night, and the mains supply fails. Whether that is caused by the electricity board or your carelessness isn`t really important. In any case, at such times you....
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A model boat that can sail autonomously along a course planned in advance. This explains the meaning of "Roboat" that is the short form for "robot boat". The core is the controller M68HC908GP20 (the quad flat plastic pack version) that stores the coordinates....
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The circuit described here is eminently suitable to indicate the capacity of a battery. We use a cheap electric clock for this. By connecting a resistor across the battery terminals, the battery is discharged somewhat faster than with the clock alone. If we....
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This PIC microcontroller tutorial provides a simple method to interface any keypad (e-g 4x4 or 4x3 etc) with PIC16F877 microcontroller. This code is writte....
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Circuits of this kind are intended to drive LED Arrays in order to create more visibility and conspicuity when a vehicle is stopped or stopping. This circuit, in particular, will emit a visual alerting signal of 4 short flashes, followed by a steady on light....
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When the push switch is operated - the buzzer will sound and the LEDs will begin to flash. For the hearing members of the household - the buzzer acts as a regular doorbell. It also re-assures the visitor that the doorbell is working. When the push switch is....
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Most of the battery chargers do not have current and voltage regulation provisions. The step down voltage is simply used for charging. These chargers devel....
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This is the most simple and affordable solar battery charger that the hobbyist can make. It has a few drawbacks over other similar controls, but offers numerous advantages. It is intended for charging lead-acid batteries, but may also be used for charging....
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The PIC32?s Analog to Digital Converter (ADC) is surprisingly difficult to set up if you re using it for the first time. Like so many of the PIC peripherals, the number of configuration options seem endless. This tutorial will help you....
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This circuit was developed to charge the Lithium-Polymer cells used in a model aircraft. Lithium-Polymer cells are incredibly lightweight compared to Ni-cad battery packs of the same voltage and amp-hour rating. Their only drawback is that they require a....
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The circuit board I purchased didn`t have a working 48v phantom power voltage converter on it. That was completely fine with me because I wanted to build a 48v DC phantom powermicrophone pre-amp which would be powered by five 9v batteries. It was good luck....
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A 200-watt class-E AM transmitter used for non-sanctioned broadcasting on 1710 kHz. Negative peak limiter, over-modulation indicator, linear scale directional wattmeter, power supply and antenna circuits (schematic diagram) are also shown....
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In battery-powered applications in which power management is key, a microprocessor may adjust its core voltage corresponding to an increase or a decrease in clock speed, allowing full processing power when necessary but not wasting excess power when idle.....
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ADP3000 internal block diagram of an integrated circuit It is a block diagram showing the internal structure of the high-frequency switching regulator IC ADP3000. ..
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As shown, the circuit uses the LM129 regulator to generate 6.9V voltage reference, provided 1.0147mA current from 6.9V reference voltage to the bridge. Bridge may be as pressur..
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The circuit consists of a small PIC microcontroller, assembly program,
and a few other parts to detect a switch closure from an open door, window,
or manual push button and then dial the cell phone number, and transmit a
steady tone to indicate the source....
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The transformer is a 220V to 12V, 50Hz and 3. 6VA PCB type transformer. The model seen in the photo is HRDiemen E3814056. Since it is encapsulated, the transformer is isolated from the external effects. A 250V 400mA glass fuse is used to protect the circuit....
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The UART (universal asynchronous receiver/transmitter) is a serial protocol with separate transmits and receives lines, and can be used for full duplex communication. The Spartan-6 board has 2 Serial Port, indicated as in Figure. RS-232 serial communication....
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Many electronic-control systems have digital outputs that use transistors. One method of improving the security in these outputs is to use an oscillating signal to represent a logic-high state instead of a fixed voltage level (Figure 1). This type of signal,....
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a street light that automatically switches ON when the night falls and turns OFF when the sun rises. The circuit uses an LDR to sense the light ....
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Get More Information about Circuit Diagram of Mobile Jammer by visiting this link.A GSM Jammer or cell phone jammer is a device that transmit signal on the same frequency at which the GSM system operates, the jamming success when the mobile phones in the....
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One example of the phase shift oscillator is Bubba oscillator. This oscillator gets 45 degree phase shift for each section from quad op-amp package. The....
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This circuit shows the use of the XCSB servo library to control 4 RC servos. The demo runs on a 16f628 using the internal 4MHz oscilator. It uses 1 push button to select between servos and 2 push buttons to change the selected servos position. A 16x2....
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This circuit rapidly charges capacitor CST0 to a voltage equal to an input signal. The input signal is then electrically disconnected from the capacitor with the charge still remaining on CSTO. Since CST0 is in the negative feedback loop of the operational....
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As we all know, when a single-supply op amp, a bipolar signal environment to achieve a simple function may be difficult. Sometimes the need for additional operational amplifier..
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A simple home project can turn catastrophic fast if you come up against an electric cable, gas and water pipes, or your central heating system. With a handy metal detector you can check beforehand whether there are metal objects in a wall, ceiling or floor.....
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Simple resistor, diode combinations trigger and control SCRs over the full 180 electrical degree range, performing well at commercial temperatures. These types of circuits operate most satisfactorily when SCRs have fairly strong gate sensitivities. Since in....
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As shown in Figure by the built-in temperature sensor to control the triac TC620 achieve .png">temperature control ...
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Using the ADC on an ATtiny24 to record a AC signal. The ADC has a range from 0-3. 3V. I`m using a precision rectifier to get rid of the negative portion of the signal. I`ve attached a picture of the circuit I`m using for the rectifier. I`m using an LMC6484....
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The circuit was designed to provide 2 channels on a stereo mixer that will be used for microphones while having a crossfader operation. NE5532 an intern....
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Having a very healthy population of moles in our vicinity, I logged onto eBay and bought four of the cheaply available (ultra )sonic mole deterrents for our garden lawns in the hope of persuading them to move elsewhere. Here`s a link to a couple of similar....
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The 555 Timer is an integrated circuit used as a timer, a pulse generator, tone generator and many other circuit functions, all from one universal IC function. Each pin function is described and design recommendation are given when required. A Monostable....
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It is a relatively simple circuit, with which we can have optical and sound clue, when we have telephone ring in the line of telephone. The calls in the line, are changed in pulses of frequency 400 HZ from the IC2, in exit 3. Then via the IC4, after they are....
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This circuit of measurement of level uses the UAA180 of SIEMENS and a circuit of rectification of precision, round the IC2B. The calibration has become in steps 3db from the one Led in the other, ensuring, a very good rate of precision, in the measurement of....
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This 40V dual power supply circuit was designed in response to a request made by Michael from Philippines. His application is to power the 150 Watt amplifier circuit published here. I think this power supply design is adequate for the purpose. The....
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The circuit provides a clean, stable square wave and it will operate on anywhere from 6 to 15 volts. The IC and color-burst crystal are the kind used in TV receivers...
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This is a design circuit for a temperature sensor circuit that uses an LM335, an IC that converts the ambient temperature into an equivalent output voltage. The voltage output of an LM335 increases by approximately 10 mV for every 1 degree Kelvin of rise in....
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With a handful of inexpensive components, a little creativity, and the power of PicBasic, you can build some pretty outstanding robotics creations as Rob Arnold proves with his Ruf-Bot project. RF remote control is just way too cool not to use in your....
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In conventional triangular-wave oscillators, hysteresis from positive feedback in the Schmitt trigger determines the voltage levels and amplitude of the triangular waves. With this topology, it`s difficult to independently vary the voltage levels and....
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Here is a simple 3 band graphic equalizer circuit made of a single op amp IC LF351 (IC1) and few passive components. The component values of this circuit are not very critical and can be replaced with nearest values with a little loss on the performance.....
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This was a small circuit made for driving an Impact counter. The heart being ICL8038. It must have been a Motor driving a Conveyor, the motor has a feedback attachment called Tachogenerator. Only part of the circuit is shown here. See the image of product....
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The gate-source voltage needed to bias the transistor into the linear region can vary between 0. 25V and 8V, which leaves a good 7. 75V down to a hopeless 0. 4V for the transistor and load if used with a typical NiCad 8. 4V PP3 You`ll have to get more FETs....
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Using an ATmega 2560 and therefore the heart of Arduino, we have developed a universal remote control with GSM. This allows to control 2IN/2OUT, DTMF key, gate control and GSM thermostat activated remotely. The remote control is easier, thanks to the....
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Control button switches SB1-SB4 can be installed in different positions corridor, just move SB1 ~ SB4 any one button, lights EL horse lights on, and after decompression transfo..
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The 555 timer IC is a very versatile and useful component and can be used for many things, from giving clock pulses to switch debouncing and as an output transducer. The basic 555 IC is housed in an 8-pin carrier, and these come in DIL and SOIC formats. They....
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Any electronics amateur still in possess of a collection of vinyl recordings and aiming at a high quality reproduction should build this preamp and add it to the Modular Preamplifier chain. This circuit features a very high input overload capability, very....
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When a remote control signal is received, the energy stored in C2 drives the emitter diode. At the same time, Q1 switches on briefly to allow the battery to recharge C2. The green LED shows that the circuit is transmitting; and the yellow LED confirms that....
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The controller circuit can reduce a fan"s noise, power consumption, and wear, particularly in the presence of a low, fluctuating ambient temperature. Mount a temperature sensor in the fan"s airstream, and the circuit will adjust the fan speed as necessary....
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Uses the MAX641 switching controller and an external discrete charge pump to step up the input voltage. This circuit can service low loads and is efficient when the output is two, three, four times the input voltage. Adding the MAX627 MOS driver can further....
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The losses in a bridge rectifier can easily become significant when low voltages are being rectified. The voltage drop across the bridge is a good 1. 5 V, which is a hefty 25% with an input voltage of 6V. The loss can be reduced by around 50% by using....
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Using LM386 power amplifier designed for use in low voltage consumer applications can be designed a very simple voice amplifier with variable gain and volume control. The gain is internally set to 20 to keep external part count low, but the addition of an....
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Build based operational amplifier NE5532 and a couple of power transistor TIP41A / TIP42A, this audio amplifier circuit has capability to deliver up to 10W audio power output into 8 ohm speaker. This circuit is related to the 18 Watt Audio Amplifier, and was....
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This is a very simple and inexpensive circuit uses an operational amplifier IC 741 (IC1) and push-pull amplifier using transistors for amplification of a signal. The name of the project it self suggests its application. It can be used for level control in....
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Automatic sprinkler control circuit It shows automatic sprinkler control circuit. The circuit mainly by the humidity sensor, a detection signal amplifying circuit (transistor V..
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The circuit is an VXO with buffered output. It operates on 20-meter amateur radio band with the output voltage about 0.2 Vp-p.
The crystal frequency is pulled by tuning the variable capacitor CV1 about 36Khz with only one crystal (Y1), and 250Khz by using....
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Adjustment potentiometer RP, can change the over-voltage limit setting. If the DC power supply polarity is reversed, and there may be burned equipment components, for which pow..
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It uses a negative temperature coefficient thermistor for temperature sensing element Rt. By the resistor Ri, Rs, , potentiometer RP and thermistor R. Composition temperature bridge; by the transistor VTi, VT2 constituting the differential amplifier; by the....
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Frequency converter schematic, frequency to voltage converter schematic, Frequency to Voltage Converter Using TR, Voltage to Frequency Converter Application..
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Circuit shown in Figure 3-69. It applies to require frequent timing control motor reversing operation of the occasion. Drawing, thyristor Vl, V2 and V7, vs used as a positive c..
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The principle of the circuit The motorcycle anti-thief alarm circuit is composed of the detection alarm circuit, the charging circuit and the anti-theft control circuit, this circuit is as shown in figure 7-94. The detection alarm circuit is composed of the....
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This is an infrared transmitter circuit of the signal is small and using a power supply of 1. 5 V only. by the main electronics are the two LM3909 (oscillator IC LED Flasher) Normally, we tend to put it to work as a simple flashing light circuit. Use a....
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This circuit uses a PUT for phases control of an SCR. The relaxation oscillator formed by Q2 provides conduction control of Ql from 1 to 7.8 ms or 21.6° to 168.5°. This constitutes control of over 97% of the power available to the load. ..
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No description available...
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Antenna is about 20cm of insulation made of strands, these strands glued around inside a small plastic box. RF current by two diode rectifier, a 10k potentiometer to pin field ..
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Many applications require current sources rather than voltage sources. When you need a high-current source, using a linear regulator is inadvisable, because of the high power dissipation in the series resistor. To solve the wasted-power problem, you can use....
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If both the reading are high then the diode is short. If both the readings are Low then the diode is open. If any of read pins are low and the second is high then the diode is good. This concept can be easily extended to test a transistor by realizing that a....
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This is an article written by a one of my readers, Yash Tambi, Core Committee Member, roboVITics. Do read this post and pitch in your comments below regarding this. Thanks! RF controlled bots are the most simple of their kind. All you need are a few ICs,....
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This simple micro-control circuit controls a servo motor according to a 3-state switch. A servo motor acts as an actuator in 3 position. It has 3 wires, one for VCC, one for Ground and another one for position control. The last signal is a single pulse with....