Top Circuits Page 173
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The graphic equalizer shown here is based on the IC LA3600 from Sanyo Semiconductors. LA 3600 is a single integrated single Op-amp, 5 band graphic equalizer IC which is very suitable for applications like portable stereo, radio sets, home theater systems,....
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This article is about a simple 5 channel radio remote control circuit based on ICs TX-2B and RX-2B from Silan Semiconductors. TX-2B / RX-2B is a remote encoder decoder pair that can be used for remote control applications. TX-2B / RX-2B has five channels,....
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LM3876 based 50 watt audio amplifier circuit. Operates from +/-35V DC. Simple design, low noise,....
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Here the NE555 is wired as an astable multivibrator. When the push button switch S1 is pressed the LEDs D1 & D2 will flash alternatively. That is when output is high D2 will glow & when output is low D3 will glow. The rate of flashing will depend on....
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An astable multivibrator, often called a free-running multivibrator, is a rectan gular-wave generating cir cuit. Unlike the monostable multivibrator, this circuit does not require any ex ternal trigger to change the state of the output, hence the name....
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Are you familiar with the basics and applications of the 555 timer IC Are you looking for a book that provides all these basics If so, CircuitsToday has started an online store from where you can buy books on 555 timer IC, which have been reviewed in detail.....
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As discussed in previous blog posts, pin 5 terminal is voltage control terminal and its function is to control the threshold and trigger levels. Normally, the control voltage is +2/3VCC because of the internal voltage divider. However, an external voltage....
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A 5V power supply using IC 7805 is designed and explained with a neat circuit diagram....
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For circuits using TTL ICs the supply voltage is a great concern and a slight increase in supply from the rated 5V may damage the IC. Using fuses alone does not solve the problem because a fuse may take several milliseconds to blow off and that`s enough time....
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Here is the circuit diagram of a 5V transformer less power supply using minimum components. The working of this circuit is quite simple. Resistor R1 does the job of current limiting and bridge D1 rectifies the mains voltage. The Zener diode regulates the....
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A simple and efficient 6 to 15V boost/stepup dc to dc converter based on IC L2585. This voltage converter circuit requires few external components....
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A simple 6 volt dc regulator circuit with diagram and schematic using 7806 Ic, a positive voltage regulator.Its an elementary 6 volt,1 ampere power supply circuit....
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Here is the circuit diagram of a fully transistorized inverter that can drive up to 60W loads. Transistors Q1 and Q2 forms a 50Hz astable multivibrator. The output from the collector of Q2 is connected to the input of the Darlington pair formed by Q3 and Q4.....
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A simple seven/7 segment counter circuit with an LED display. This counter circuit diagram is designed using IC CD 4033 as counter,555 Timer IC and seven segment LED Display LT 543....
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6 function 8 channel light chaser using 8051. AT89S51 which belongs to the 8051 family is used for generating 6 lighting sequences. Simple software and hardware....
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This 8 function serial Christmas lamp controller is based on the IC UTC 8156 from Unisonic. Specially designed for the same purpose, the UTC 8156 can control the four lamps in 8 modes namely waves, sequential, slo-gol, chasing/flash, slow fade,....
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Here is the schematic of a simple flouroscent lamp driver circuit based on two transistors. The circuit uses capacitive ballasting for driving the tube. An 8 W standard flouroscent tube can be efficiently driven using the circuit. The two transistors (2Sc....
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Active crossover circuit design,circuit diagram,schematic, diy active crossover circuit,HiFi audio crossover, 2 (band) way crossover circuit using LM833....
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Here is the circuit diagram of an adjustable voltage regulator using IC L200. L200 is a monolithic integrated adjustable voltage regulator IC having features like current limiting, thermal shut down, power limiting, input over voltage protection etc. Here....
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The filament of a incandescent bulb is the sensing part of the circuit. When there is no air flow the resistance of the filament will be low. When there is air flow the resistance drops, because the moving air will remove some of the heat generated in the....
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The circuit diagram and detailed explanation of a simple aircraft radio circuit is given below....
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High quality AM radio circuit based on TDA1572 IC. The AM radio receiver circuit operates from 9V DC and has 1W output power. Requires minimum external components....
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A very cheap and simple AM receiver circuit using IC MK484. The circuit requires fewexternal components and has a frequency range from 150KHz to 3MHz....
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This is the circuit diagram of the simplest single chip AM radio. The circuit is designed around the IC ZN414Z which is a ten transistor tuned radio frequency receiver. The IC has only three leads and is available in the TO92 package. All necessary circuits....
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The design came from the interest of finding a new technique of analog to digital conversion. The two types of ADC (Analog to Digital Converter) that inspired me in the development of this circuit are Flash Type ADC and Successive Approximation Type ADC. The....
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Analog to Digital Converters - Successive Approximation Type Analog to Digital Converter, working,circuit diagram....
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This circuit can be used to identify whether there is a clipping in a particular wave form. Clipping is a phenomenon in which the amplitude of a particular waveform drops before it reaches the expected limit. This circuit glows an LED as an indication if the....
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Here is a simple 1KHz audio distortion meter that can measure the Total Harmonic Distortion (THD) on any load at any out put power. Here you have the option to select 2, 4, 8 or 16 Ohm loads. The circuit works by filtering the 1 kHz fundamental signal using....
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A simple audio level meter or a Volume unit VU level meter circuit with diagram and schematic. This sound level meter is designed using transistors with a flat frequency response in the range of 20Hz to 50Khz....
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This is the circuit diagram of a two channel audio line driver using the high performance dual opamp IC TSH22 from ST Microelectronics. The 25 MHz bandwidth, low distortion and high output current of the IC makes it possible to drive medium impedance loads....
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Here is the circuit schematic of a simple audio surveillance system in which the transmitter will pickup sound from one location and the receiver at other location will reproduce it. The receiver and transmitter are connected by only one set of wire. Here....
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ICL8038 based audio oscillator circuit. Simultaneous sine, triangle and square wave forms. Dual supply operation. Cover full audio frequency range....
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So far, we have considered the oscillators which use L-C tuned circuit that causes a phase shift of 180 ° due to inductive or capacitive coupling in addition to a 180 ° phase shift produced by the transistor itself. The oscillators employing L-C elements,....
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A simple audio watt meter circuit or an audio power or audio level meter circuit with diagram and schematics to measure amplifier audio output power in watts....
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A circuit that can turn off head lights/lamps of a car/vehicle automatically after a preset time.This light switching circuit is built using 555 timer IC....
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With this cool circuit integrated to your cars headlight system, you can drive cool headed in high beam. The circuit will take over the duty of low beaming the headlight when vehicles approach against, and high beams the lights when they pass over. The....
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This is one of the most cost effective (cheap) and simple emergency light circuit developed for CircuitsToday This is an automatic emergency lamp with day light sensing, means it senses darkness/night and turns ON automatically. Similarly it senses day light....
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A simple and cheap automatic night light circuit desingned based on timer IC NE555 that extinguishes after a preset time. This time can be adjusted too....
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A circuit for car windshield/wiper motor speed control built using NE 555 IC.This enables intermittent windshield wiper control which changes sweep rate to 10 seconds....
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This is a simple circuit that can be used as a sequential signal light in automobiles. The circuit is based on two ICs. A TS 555 CN CMOS timer IC and a CD4017 decade counter IC. The IC1 is wired as an astable multivibrator to trigger the counter IC. When....
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Such voltmeters can be used for measurement of both dc and ac voltages and are very popular. These voltmeters are available in both versions, vacuum tube type and transistorized type and are described below: In this instrument two identical triodes T1 and T2....
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A band-pass filter is a circuit which is designed to pass signals only in a certain band of frequencies while attenuating all signals outside this band. The parameters of importance in a bandpass filter are the high and low cut-off frequencies (fH and fl),....
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Number of controls are required to be provided on a panel of CRO to facilitate its proper functioning. Intensity control is provided for adjustment of brightness of the spot on the screen. It is accomplished by varying the voltage between the first and....
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A very simple battery charger circuit having reverse polarity indication is shown here. The circuit is based on IC L200. L200 is a five pin variable voltage voltage regulator IC. The charging circuit can be fed by the DC voltage from a bridge rectifier or....
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Here is a simple but effective battery charger circuit using IC LM 317. The circuit can be used to charge 12Vlead acid batteries. The circuit is very simple and can be easily assembled on a general purpose PCB. The heart of the circuit is IC LM 317, which is....
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A simple battery charger based on SCR is shown here. Here the SCR rectifies the AC mains voltage to charge the battery. When the battery connected to the charger gets discharged the battery voltage gets dropped. This inhibits the forward biasing voltage from....
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Here is a simple circuit using IC LM 350, which can be used for charging 12V lead acid batteries. This circuit is perfect for constant charging 12V lead acid batteries. The circuit is designed as a constant voltage source with a negative temperature....
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This simple circuit can be used to monitor whether a battery is charging or not. The voltage comparator IC LM393 is the heart of this circuit. The LED D1 will remain ON whenever there is at least 25 milli ampere current flowing to the battery. This....
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This is the circuit of a low power LED night lamp that will automatically switch OFF at day time. The CMOS timer IC TS555CN is wired as a square wave generator operating at around 5Hz. The output voltage from the IC1 is doubled using the combination of....
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This simple tone control circuit is designed based on the famous Baxendall tone control circuitry. The circuit given here can give a maximum cut or boost of around 12 dB at 10 KHz (treble) and 50Hz (bass). Also, both bass and treble can be independently....
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This is a simple and easy to construct circuit that can be used to provide a bidirectional drive to a DC motor. The circuit operation is straight forward. Output of an astable mutivibrator based on IC1 (NE555) is used to control the relay RL1 driving the....
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The circuit given here can be used to control the brightness of low power incandescent lamps. The circuit is based on IC NE555 which is wired as an astable multivibrator with variable duty cycle. The output of IC is connected to the base of transistor Q1.....
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A simple a very efficient buck boost converter implemented using LTC344o IC . The output voltage is 3.3V and input can be between 2.7 to 4.2 volts....
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This is a very simple cable TV amplifier using two transistors. This amplifier circuit is most suitable for cable TV systems using 75 Ohm coaxial cables and works fine up to 150MHz. Transistor T1 performs the job of amplification. Up to 20dB gain can be....
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This is a simple electronic alarm circuit that imitates the chirping of a canary. The circuit is nothing but a Hartley oscillator with few more passive components added. As the capacitor C1 charges through the resistor R1 and the transistor Q1 is driven to....
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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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Given below, is a very simple circuit that can be used for charging car batteries. In this circuit there is facility for monitoring the charging current and voltage. The circuit is based on the IC MC78T12ABT from Freescale. The IC is nothing but a 7812 in....
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A car stereo amplifier circuit that can be used in automobiles, designed using Class-B audio amplifier TDA1553, with circuit diagram and schematics....
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A car stereo amplifier circuit using TDA2040 is shown here. TDA2040 is a monolithic integrated audio amplifier that operates in Class AB mode. The IC has built in circuitry for short circuit protection and thermal shut down and more over it can be operated....
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Here is the circuit diagram of a simple subwoofer filter that can be operated from a 12V DC supply. Such a circuit is very useful in automobile subwoofer applications. The circuit is nothing but a low pass filter whose pass frequency can be adjusted between....
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With this cool cat/dog repeller circuit you could chase the cats off from any where you want. In fact, I designed this circuit to chase my cat from my computer table. Most of the animals like cats respond violently to ultrasonic sound and in fact it`s the....
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Circuit diagram schematics of Electronic Keys, Electronic Locks,Digital Electronic Locks,Transistor Code Locks,Combination Electronic Locks....
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Many fire alarm circuits are presented here, but this time a new circuit using a thermistor and a timer to do the trick. The circuit is as simple and straight forward so that, it can be easily implemented. The thermistor offers a low resistance at high....
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Here is a simple charger circuit for charging SMF(sealed maintenance free ) batteries. The charger circuit being curernt and voltage regulated, can be safely used to charge SMF batteries of 1. 2 AH rating. This circuit was actually designed in response to a....
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Colpitts oscillator circuit diagram and theory. Colpitts oscillator frequency equation. Colpitts oscillator using transistor. Colpitts oscillator using opamp....
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The contact less telephone ringer circuit can produce a ring as well as a visual indication when a call comes. The main advantage is that since there is no direct contact between the phone line and the circuit there is no chance for a loading or disturbance....
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If the load resistance RL is reduced or load terminals are shorted acciden tally, a very large load current will flow. It may destroy the pass transistor Q1, diode or possibly some other component. Fuse protection will not prove adequate because the....
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In crystal oscillators, the usual electrical resonant circuit is replaced by a mechanically vi brating crystal. The crystal (usually quartz) has a high degree of stability in holding con stant at whatever frequency the crystal is originally cut to operate.....
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A preamplifier operating on a single supply and suitable for use with high impedance type crystal pickups is shown here. The circuit is basically a non-inverting AC amplifier in which the gain is dependent on the feedback resistor R4. The smaller is the R4,....
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A circuit diagram that can be used for the generation of CW Morse code is shown here. This circuit can be very useful those who would like practice Ham Radio. The circuit is nothing but an astable multivibrator based on NE 555. The frequency of oscillations....
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Here is a simple dancing light circuit based on NE555 (IC1) & CD4017 (IC2). The IC1 is wired as an astable multivibrator to provide the clock pulses for the CD4017. For each clock pulse receiving at the clock input (pin14) of IC CD4017, the outputs Q0 to Q9....
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The dark detector circuit shown here can be used to produce an audible alarm when the light inside a room goes OFF. The circuit is build around timer IC NE555. A general purpose LDR is used for sensing the light. When proper light is falling on the LDR its....
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A DC motor controller based on NE555 timer is shown here. Direction of rotation of DC motor can be also changed by this DC motor speed control circuit....
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This type of voltmeter is very common because of its low cost. This instrument can be used only to measure voltages of the order of milli-volts owing to limited amplifier gain. The circuit diagram for a direct coupled am plifier dc voltmeter using cascaded....
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Here is very simple circuit in which the LED becomes ON only after a preset time the power supply is switched ON. When the power supply is switched on the transistor will be OFF. The capacitor now charges via the preset R3 and when the voltage across C1 is....
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The diacs, because of their symmetrical bidirectional switching characteristics, are widely used as triggering devices in triac phase control circuits em ployed for lamp dimmer, heat control, universal motor speed control etc. Although a triac may be fired....
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This is a simple but effective code lock circuit that has an automatic reset facility. The circuit is made around the dual flip-flop IC CD4013. Two CD 4013 ICs are used here. Push button switches are used for entering the code number. One side of all the....
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This is a simple and easy to construct digital dice circuit. The circuit is based on a single IC, CD4060B. The dice consists of six LEDs marked D1 to D6. The number of LEDs glowing indicates the numeral. The heart of this circuit is 14 stage binary ripple....
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A digital stop watch or digital timer circuit schematic built around timer IC LM555 and 4-digit counter IC MM74C926 with multiplexed 7-segment LED display....
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A digital temperature sensor circuit is explained with circuit diagram.ICs ADC 0804,LM35 and LM317 are used in this digital circuit project....
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A simple digital thermometer circuit with out a micro controller and having a seven segment LED read out is shown here. The circuit is based on three ICs: CA3162, CA3161 and LM35. CA3162 is a monolithic analogue to digital (A/D) converter that has BCD....
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A D/A converter using binary-weighted resistors is shown in the figure below. In the circuit, the op-amp is connected in the inverting mode. The op-amp can also be connected in the non-inverting mode. The circuit diagram represents a 4-digit converter. Thus,....
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The circuit given here is of a very useful and accurate digital voltmeter with LED display using the ICL7107 from Intersil. The ICL7107 is a high performance, low power, 3. 5 digit analog to digital converter. The IC includes internal circuitry for seven....
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A digital volume control circuit diagram using DS 1669, a potentiometer IC.This can be used as a digital volume controller for audio amplifiers and other applications....
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This is the circuit diagram of a ding dong sound generator based on two NE555 timer ICs. The circuit is designed to toggle between two adjustable frequencies to produce the ding dong sound. The first NE555 (IC1) is wires as an astable multivibrator operating....
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A simple direct coupled radio circuit diagram and schematic, ideal for adjacent stations.This circuit uses Q1 as audio amplifier and base emitter capacitance provides radio filtering....
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The main part of this doorbell circuit are two NE555 timer ICs. When some one presses switch S1 momentarily, the loud speaker sounds a bell tone as long as the time period of the monostable multivibrator built around IC1. When the switch S1 pressed, IC1 is....
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A simple doorbell circuit diagram and schematic designed using UM 66 IC, which is a music sound generator. This is an easy to make electronic doorbell circuit....
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The automatic door handle alarm circuit gives a audible alarm and glows a LED when somebody touches the handle of the door. The circuit is latching type and continues to produce sound until it is switched off. The transistor Q1 is wired as an astable....
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Dual adjustable power supply circuit with diagram using IC LM 317 and LM 337. This variable power supply circuit has a range of 1.2 Volts to 30 Volts....
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This dual power supply is based on the L165 power operational amplifier from SGS-Thomson Micro electronics. The IC L165 can easily deliver up to 3. 5A of current (internally limited). The IC is available in Pentawatt package and is very suitable for power....
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A dual tone model train horn/sound generator/simulator circuit can be made using two NE 555 timers connected in cascade. But here circuit diagram is designed with NE 556 IC, which is nothing but two 555 in one package....
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This is a very simple circuit that can be used to sense electromagnetic radiations. The circuit can even detect hidden wrings. A 1mH inductor is used for sensing the electric field. The electric field will induce a small voltage in the sensor inductor and....
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Here is the circuit diagram of an ultrasonic mosquito repeller. The circuit is based on the theory that insects like mosquito can be repelled by using sound frequencies in the ultrasonic (above 20KHz) range. The circuit is nothing but a PLL IC CMOS 4047....
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It is one of the most versatile general purpose instruments capable of measuring dc and ac voltages as well as current and resistances. The solid-state electronic multimeter (or VOM) generally consists of the following elements. In addition, the instrument....
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This is a compact electronic siren circuit based on three transistors. This circuit is suitable for in corporating with other alarm or siren projects such as burglar alarms, automatic factory sirens etc or a simple push to on alarm. The electronic siren....
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The circuit given here can be used for tossing head or tail. There are many games in which a tossing is required to start and this circuit can be used in all such instances. The circuit uses two ICs NE 555 timer (IC1) and 74LS76 dual JK flip flop (IC2). The....
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A simple F to V converter circuit with diagram and schematic using LM555 Timer IC.This circuit has lots of applications in digital frequency meters, tachometers etc....
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Many electronic circuits related to fan speed controlling have been published here and this one is just another approach. The circuit diagram shown here is of 12V DC fan speed controller using the IC LM2941CT which is a low drop out 1A voltage regulator. The....