Top Circuits Page 104
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Here the circuit diagram of DC battery tester designed by Matthew B. This circuit can be used to measure DC battery from 1. 5V up to 9V. Component Parts List: R1 = 18K Ohm R2 = 240 Ohm R3 = 8. 2K Ohm R4 = 3K Ohm R5 = 10 Ohm M1 = Panel Meter (Anyone will.....
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The SSM22111 is a high performance audio amplifier that delivers 1 W rms of low distortion audio power into a bridge-connected 8 © speaker load (or 1. 5 W rms into a 4 © load). The SSM2211 operates over a wide temperature range and is specified for single-....
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Variable desktop power supply which will convert a high input voltage (12V) from the SMPS / PSU of a desktop computer into small output voltage (1.25 to 9...
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1000W Power Inverter circuit diagram: This is the power inverter circuit based MOSFET RFP50N06. The inverter capable to handle loads up to 1000W, it`s depended on your power inverter transformer. The RFP50N06 Fets are rated at 50 Amps and 60 Volts. Heatsink....
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1500W power amplifier circuit design diagram by Rod Elliott. The circuit is built using 10 pairs of power transistor MJ15024 and MJ15025 (or MJ21193/MJ21194)..
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150W power amplifier circuit diagram based power transistor TIP41/TIP142/TIP147.It is easy enough to built without PCB. The power output range is about 100-150W...
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This is the very simple circuit diagram of 150W power amplifier. The circuit is easy enough to built without PCB. The power output range is about 100-150W depends to the power supply and the Darlington`s you use for the amplifier. Heatsink is a must since....
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This the Good Quality FM transmitter for your stereo or any other amplifier gives you a pretty good signal strength up to a range of 500 metres having a power output of about 200 mW. This circuit can be operated with a 9V battery. The audio-frequency....
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1Hz Clock Generator Circuit with Chip On Board (COB). The COBs used in different watches may differ somewhat in their configuration. But by trial-and error one can always find out the appropriate points corresponding to points A, B, C and D. This is the 1Hz....
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This is a mini FM transmitter built and powered using 2 transistors, designed by Tony van Roon. This small transmitter is simple to build and its transmissions could be picked up on any common FM radio. It possesses a range of approximately 1/4-mile (400....
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This NiCAD battery charger circuit charges the battery at 75 mA until the battery is charged, then it reduces the current to a trickle rate. It will fully recharge a dead/unpowered battery in 4 hours and the battery can be left in the charger indefinitely.....
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200mA per Hour 12V NiCAD Battery Charger circuit. This NiCAD battery charger circuit charges the battery at 75 mA until the battery is charged, then it reduces the current to a trickle rate. The following diagram is the schematic diagram of 12V NiCAD battery....
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The following diagram is the circuit diagram of 20W power amplifier which build based tube component EL34. EL34 is very famous tube and great for power tube amplifier. The circuit above is complete circuit contains tube amplifier circuit diagram and power....
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This is the 200W lamp flasher circuit diagram. The frequency/speed of the lamp flashing can be adjust with the range of 1Hz to 5Hz. You can use the PR1 variable resistor (trimpot) to adjust the flashing speed. The duty cycle of lamp flashing can be adjusted....
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Here the 220V AC lamp touch dimmer circuit. By only touching this touch dimmer you are able to increase the light intensity of incandescent lamps in three stages. The touch dimmer is designed all around 8-pin CMOS IC TT8486A/TT6061A especially produced for....
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Can be directly connected to CD players, tuners and tape recorders. Simply add a 10K Log potentiometer (dual gang for stereo) and a switch to cope with the various sources you need. A correct grounding is very important to eliminate hum and ground loops.....
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The first section of the 555 timer is wires as an astable oscillator with R2 and C1 setting the frequency. The output is available at pin 5. The second section is wired as a phase inverter. That output is available at pin 9. Resistor R3 and R4 keep output....
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This circuit generates 3 source regulated voltages applying a minimum of electronic parts. The output DC voltage are +12V ; +5V and -5V. Diodes D2 and D3 conduct full-wave rectification, at the same time charging capacitor C2 on each halves of the....
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The following diagram is the 50W offline switching power supply circuit design. The circuit powered by a MOSFET. BUZ80A/IXTP4N8 for 220V AC voltage input and GE IRF823 for 110V AC input voltage. The output will be 5VDC with electric current up to 10A. The....
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Above circuit diagram is a easy, simple and cheap switching voltage regulator which has capability to deliver adjustable voltage output range of 1. 8V to 32V and static electric current of 3A. This regulator use adjustable regulator IC of LM317HV and a power....
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Stabilized DC Power Supply with Short-Circuit Indication. The circuit gives you four different regulated DC outputs (12V, 9V, 6V and 5V) and an unregulated 18V DC output, that are selectable by way of rotary switch S2. The selected output is showed on the....
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4 Stage FM transmitter circuit diagram. It uses four radio frequency stages: a VHF oscillator built around transistor BF494 (T1), a preamplifier built around transistor BF200 (T2), a driver built around transistor 2N2219 (T3) and a power amplifier built....
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Powered with solar panel, the circuit will give you 5V pure regulated DC voltage. The circuit is made up of an oscillator transistor as well as a regulator transistor. The solar panel charges the battery when sunlight is bright enough to generate a voltage....
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The following diagram is the 50W offline switching power supply circuit design. The circuit powered by a MOSFET. BUZ80A/IXTP4N8 for 220V AC voltage input and GE IRF823 for 110V AC input voltage. The output will be 5VDC with electric current up to 10A. The....
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This diagram is certainly the 6 transistor Tilden H-bridge circuit; while not as old as the original basic H-bridge, this goes way back, and will be the basis for a lot of BEAM driver circuits. I did a few revised drawings for Ian quite a while back, so....
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The following diagram is the schematic diagram of variable power supply which will deliver 0 to 28V output voltage at 6/8 A electric current. Component Part List: R1 = 2K2 Ohm 2, 5 Watt R2 = 240 Ohm R3, R4 = 0. 1 Ohm 10 Watt R7 = 6K8 Ohm R8 = 10K Ohm R9 = 47....
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This circuit requires a regulated 10V-DC front end capable of supplying 2 Amps. Begins the charge period at 240mA and at full charge switches automatically to a float condition (trickle charge) of 12mA. The capacitors should be the ceramic 50V (or greater)....
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The following diagram is the battery charger schematic for 6V Gel Cell battery type. Component Parts List: R1 = 22 ohm, 1W R2 = 270 ohm R3 = 220 ohm *R4 = 715 ohm, 1% *R5 = 3. 57K, 1% *R6 = 1. 40K, 1% *R7 = 1. 47K, 1% C1 = 0. 1 F, ceramic C2 = 0. 1 F,....
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This circuit is basically a 8W inverter circuit. The circuit continues to be intended to drive an 8W fluorescent lamp from a 12V power supply, utilizing an cheap inverter primarily based on a ZTX652 transistor. The inverter will operate from supplies in the....
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Here the simple and low cost FM transmitter circuit. The frequency range of this FM transmitter should be about 89MHz 109MHz. Output power is about 9mW at 9V. R1, R6_12K R2, R4_100K R3_22K R5_1K R7_100R Q1_BC338 Q2_BC548B Microphone JinIn ECM-60P B1....
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The following diagram is the schematic diagram of Active Tone Control circuit, or we often call thic circuit as "ACTOR" Active Tone Control or ACTOR is a electronic audio circuit that serves to increase the Loudness (Bass and Treble audio signal) is active....
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This Adjustable Analog Timer circuit starts timing when switched on. A green LED lights to show that timing is in progress. When the time period is over the green LED turns off, a red LED turns on and a bleeper sounds. The time period is set by a variable....
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Here the AM Radio receiver circuit diagram based on old single IC MK484. Components part list: R9, R10_ 6R8 R6_ 100R R3_ 1K R1_ 4K7 R7_ 5K6 R4_ 10K R2_ 100K R5_ 150K R8_ 820K Pot_ 10K log pot Coil & ferrite bar set C7_ 470p ceramic C, C4, C5, C6_ 470nF....
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The following diagram is the schematic diagram of 4 transistors FM transmitter circuit designed by Paul K. Sherby. Components List: R1, R2, R8 = 1K R3 = 100K R4 = 150K R5, R7 = 10K R6 = 220 ohm R9 = 10 ohm P1 = 5K trimpot D1 = 1N4002 Q1, Q2 = 2N3904 Q3, Q4 =....
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Here the Arduino UNO schematic diagram (click to enlarge): About Arduino UNO: The Arduino Uno is really a microcontroller board based on the ATmega328. It has 14 digital input/output pins (of which 6 may be employed as PWM outputs), 6 analog inputs, a 16 MHz....
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This is the circuit diagram of Line Follower / Line Tracker robot. The circuit taken from the tutorial documentation. You may download the full tutorial at the end of this article. The line follower robot use 8 pieces of proximity sensor module. The sensor....
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This is the circuit diagram of audio/video modulator. The circuit will convert an audio and video signal into a UHF TV signal. It`s desired to connect a video signal originating from a camera or other video source to a normal TV set. The audio and video....
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The circuit will convert an audio and video signal into a UHF TV signal. It`s desired to connect a video signal originating from a camera or other video source to a normal TV set. The audio and video signal is converted into a UHF TV signal so. This is....
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During nighttime, when no light falls on LDR1, it offers a high resistance at the base junction of transistor T1. So the bias is greatly reduced and T1 doesn`t conduct. Effectively, this removes the common terminal of IC1 from ground and it directs the full....
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When mains is absent, relay RL2 is in deenergised state, feeding battery supply to inverter section via its N/ C contacts and switch S1. The inverter section comprises IC2 (NE555) which is used in stable mode to produce sharp pulses at the rate of 50 Hz for....
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The Axe Grinder is designed with a few key fetures in mind, it not only serves a wide range of distortion sounds clipping part of the effect, it also gives the user the ability to overload their amp with a greatly boosted clean tone. The distorted tone and....
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Q1 and Q2, as well as T1, determine how much wattage the inverter can supply. With Q1, Q2=2N3055 and T1= 15 A, the inverter can supply about 300 watts. Larger transformers and more powerful transistors can be substituted for T1, Q1 and Q2 for more power. 2.....
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The following diagram is the schematic diagram of Active Tone Control circuit, or we often call thic circuit as "ACTOR" Active Tone Control or ACTOR is a electronic audio circuit that serves to increase the Loudness (Bass and Treble audio signal) is active....
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Cigar Lighter Plug to USB Power Socket. This circuit is convert 12V DC source from car cigar lighter plug to become USB power sochet with 5V DC output. This circuit can be used to powering 5V electronic devices or recharge the rechargable battery from USB....
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The cell phone shield circuit uses two NE555 timer ICs: One as being a very simple astable multivibrator (IC2) and then the 2nd as being a monostable multivibrator (IC3). The astable multivibrator has timing resistors R1 and R2 but no timing capacitor since....
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Cheap motorcycle alarm circuit. During parking, hidden switch S1 is normally open and will not permit triggering of MOSFET T1. But when somebody starts the motorcycle by using ignition switch S2, MOSFET T2 triggers through diode D1 and resistor R5. Relay RL1....
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The circuit provided right here allows up to eight participants with each one assigned a unique number (1 to 8). The display will show the number of the Electronic jam circuit diagram. contestant pushing his button prior to the others. Concurrently, a buzzer....
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Color sensor circuit which can sense eight colors, i.e. blue, green and red (primary colors); magenta, yellow and cyan (secondary colors); and black and white...
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The potensiometer adjust the trigger on` level. The diode in the circuit diagram shows to be 1N914. This is ok if you have a light-duty relay, also the 1N914 is a signal diode so actually does not qualify. Use a 1N4001 (or better) instead. A couple of....
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This is a DC motor controller circuit, built using transistor TIP31 based on H-Bridge concept. The switch S1 and S2 are normally open, push to close, press button switches. The LED function is to indicate the direction of motor rotation, you may use any....
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DC motor speed controller circuit, applies two timers connected as a Pulse Width Modulator. The chip put into use will be an nmos dual timer/oscillator NE556..
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This is the DOD Overdrive 250 preamp circuit diagram. The DOD Overdrive 250 is Yet Another 741 With Two Diodes On The Output channel. It is almost exactly the same as the MXR Distortion Plus, and a number of other units. Download the DOD Overdrive 250....
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Dynamic microphones are versatile and ideal for general-purpose use. They use a simple design with few moving parts. They are relatively sturdy and resilient to rough handling. They are also better suited to handling high volume levels, such as from certain....
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The following circuit is a simple, cheap and easy build motorcycle alarm. The circuit just required 2 transistors to drive the relay the the relay act as a switch to activate the buzzer. Any number of normally-open switches may possibly be applied. Fit the....
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The circuit just required 2 transistors to drive the relay the the relay act as a switch to activate the buzzer. Any number of normally-open switches may possibly be applied. Fit the mercury switches to ensure that they close when the steering is. The....
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The following circuit is the combination of echo chamber circuit that will make the sound repeated, just like an echo sound when you speak in cave. And the robot voice effect circuit that change the audio signal from input to become sound like a robot voice.....
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This is the diagram od electro-harmonix graphic equalizer. You can specify the number of channels according to your needs. You just need to parallel the components: C1, C2, R1, an om-amp, Potensiometer and a 470 ohm resistor. The frequency to be boost....
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Electronic horn circuit diagram. When power line is switched on, a general/basic tone is produced by transistor T2 and transformer X1, that is frequency-modulated by the wandering voltage generator, which, in turn, is affected by the low-frequency squarewave....
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Here the circuit diagram of electronic siren based NE555. This circuit produces a sound like factory siren. It applies a 555 timer IC which is utilized as an astable multivibrator of a center frequency of about 300Hz. The frequency is controlled by the pin 5....
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The basis of the electronic tachometer frequency converter circuit-current, which converts the input signal into a proportional current measured pointer device..
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File alarm with LDR sensor. The sensitivity of the circuit is dependent upon the distance between bulb and LDR as well as setting of preset VR1. Thus by putting the bulb and the LDR at proper distances, one may vary preset VR1 to have optimum sensitivity.....
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Flame, gas and smoke detector for fire alarm. You can combine this circuit with alarm circuit. The output will be the relay which switch on and switch off the alarm. The above scheme diagram is the diagram of flame detector. The circuit diagram for gas....
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This is a mini FM transmitter built and powered using 2 transistors, designed by Tony van Roon. This small transmitter is simple to build and its transmissions could be picked up on any common FM radio. It possesses a range of approximately 1/4-mile (400....
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The range of frequencies for the FM broadcast band is 90MHz (MHz = Megahertz or 90 million cycles per second). Because the FM microphone has a variable tuned circuit, it can be tuned to a quiet spot on your local FM broadcast band for the best reception.....
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Good Quality FM transmitter circuit for your amplifier, gives you a pretty good signal strength up to range of 500 metres having a power output of about 200 mW..
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The following diagram is the circuit diagram of 20 band stereo graphic equaliser which will controlling the audio signal in specific frequency range. This circuit must be connected before the amplifier circuit. For maximum performance, you may use high....
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This LAN tester circuit originally designed by Vassilis Stergiopoulos. This LAN tester circuit optionally has two designs. The first design is built based 2 main ICs that are timer IC555 and decade counter 4017. The second design is based microcontroller....
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Here the circuit diagram of Lantern dimmer/flasher designed by Tony Van Roon: Electronic parts List: R1 = 100K R2 = 100K R3 = 100K R4 = 100K R5 = 3K9 R6 = 3K9 R7 = 470 R8 = 100 R9 = 220, 1/2 watt P1 = 5K C1, C3 = 10uF/16V C2 = 0. 01uF, ceramic T1. This....
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Laser communication system circuit diagram. The circuit module consists of a transmitter and also a receiver which use IC LM386. It is powered by a 9V battery..
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Lead-Acid Battery Charger circuit diagram. The LM301A compares the voltage drop across R1 with an 18 mV reference set by R2. The comparator`s output controls the voltage regulator, forcing it to produce the lower float voltage when the battery-charging....
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I`ve found some interesting schematic of Load Cell amplifier. As we know, load cell amplifier is pretty expensive with fair price range of 100-300 USD. You may built your own load cell amplifier to get the lower cost. Load Cell Amplifier using AMP04: source:....
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Long distance infrared transmitter circuit diagram. Here is a simple circuit that will give you a pretty long range. It uses three infrared transmitting LEDs (IR1 through IR3) in series to increase the radiated power. Further, to increase the directivity and....
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This is a low-cost and simple intercom circuit design which utilizes 3 transistors. Even a newbie can assemble it on a piece of veroboard without difficulty..
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Low Cost Water Pump Controller Circuit. The sensors applied to the circuit could be any two conducting probes, preferably resistant to electrolytic corrosion. For example, in the easiest case, a appropriately sealed audio jack could be utilized to operate as....
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This is the schematic diagram of LPG gas leakage sensor alarm. The circuit operates off a 9V PP3 battery. Zener diode ZD1 is applied to convert 9V into 5V DC to drive the gas sensor module. The SEN-1327 gas sensor module from RhydoLABZ is applied in this....
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This is the very simple way to play a song with single 1. 5 battery. You can build this circuit for gift acceccories. When the gift opened, then a song will be played. It`s easy and cheap right. :D. It just use a single small chip which will generate a song....
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Transistors T1 and T2 form the mic preamplifier. Resistor R1 gives the required bias for the mic condenser whilst preset VR1 works as gain control for adjusting its gain level. As a way to boost the audio power, the low-level audio output from the....
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Here the SW transmitter circuit based on IC BEL1895. This particular transmitter circuit works in shortwave HF band (6 MHz to 15 MHz), and can be applied for shortrange communication and for educational purposes. The circuit is composed of a mic amplifier....
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The circuit is built around popular CMOS oscillator-cum-divider IC 4060 and small audio amplifier LM386. IC 4060 is used as the multitone generator. A 100 H inductor is used at the input of IC 4060. So it oscillates within the range of about 5MHz RF. IC 4060....
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The following diagram is the Clock Generator circuit diagram which build based on NAND Gate logic IC. You may use IC 7400 or 4011 for this circuit. The 7400 is a TTL type, while 4011 is CMOS type. IC 4011 is cheaper than 7400 but the 7400 is faster than....
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The following diagram is the schematic diagram of Ni-CAD Battery Charger circuit which featured with current and voltage limiting to keep the battery lifetime. The lamp L1 will be light brightly and the LED will be out when the battery is low and battery....
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Portable 230V lamp flasher circuit diagram. The circuit is completely transistorised and battery-powered. The free-running oscillator circuit is realised working with two low-power, low-noise transistors T1 and T2. One of these two transistors is constantly....
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This is linear amplifier which need advance knowledge in electronics since the schematic diagram is very complex for hand made circuit. I think you have to re-design the schematic diagram using circuit diagram design software such as diptrace, eagle,....
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Pyroelectric Fire Alarm System Diagram. The front end of the circuit contains a sensitive signal amplifier constructed close to IC1 (CA3130). It delivers a high output when temperature near the piezo component raises. IC CA3130 is really a CMOS operational....
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Remote control tester circuit diagram. The tester is designed around infrared receiver module TSOP1738. Operation of the remote control is identified by a tone from the buzzer. The circuit is sensitive and has a range of about 5 metres. The integrated IR....
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This is the door bell circuit with flashing LEDs to make the circuit more attractive. IC1 (NE555) is applied right here as being a clock generator. It is actually set up as an astable multivibrator whose frequency could be altered using the support of....
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Simple and easy build of FM transmitter circuit. The circuit only require 2 transistors. Circuit Notes: Typically the default for the capacitors model is ceramic, preferably the npo 1% type or equivalent. However, generally almost nothing critical right....
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This easy circuit provides good gain to weak audio signals such as electret microphone. Use it in front of an RF oscillator to make an RF transmitter that`s very sensitive to sound. Here the simple audio mic pre amplifier circuit based on single IC LM358.....
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The following diagram is a very easy and simple electronic combination lock based on IC LS7220. Component Part List: C1 = 1uF 25V C2 = 220uF 25V R1 = 2. 2K Ohm Q1 = 2N3904 / 2N2222 D1 = 1N4148 / 1N4001-1N4007 K1 = 12V SPDT Relay / Any appropriate relay with....
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Figure 1 exhibits the circuit with the muscular stimulator. IC 7555 is actually wired just as one astable multivibrator to build about 80Hz pulses. The particular output involving IC1 is fed to be able to transistor T1, whose emitter is actually further....
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Above diagram is a very easy and efficient receiver for actuating garage doors, starter motors, alarms, warning systems and many some other possibilities. The SCR, which has a extremely low trigger current of 30 uA is typical - it demands an input....
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Here the simple audio mic pre amplifier circuit based on single IC LM358. The circuit is very simple, inexpensive and easy to built. Component Parts List: R1, R3, R4 = 10K R2 = 1K R5 = 100K-1M Potensiometer C1 = 0. 1uF C2 = 4. 7uF/16V IC1 = LM358 dual op-amp....
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Here the simple mixer with 4 input and 2 op-amps: A basic mixer suitable for mixing microphones or even effects outputs. The overall gain from input to output is one if the pot related towards the input is full up. You can make this a net gain of ten (or any....
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The 220-240V AC mains source is stepped down to 9V AC by transformer X1. The transformer output is rectified by diodes D1 through D4 connected in bridge configuration and the positive DC source is straightly wired to the charger`s output contact, while the....
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This is probably the simplest radio transmitter that you will find anywhere. It has a total of five parts and can be constructed into a very small space. It is great for science fair projects or other science related projects where short range transmission....
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The following circuit is six LED stereo VU display diagram which build using Dot/Bar Display Driver IC LM3915. This VU disply should be connected before amplifier module circuit. You may connect this circuit at pre-amp output, tone control input/output or....
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A Solid State Relay is in reality not a relay after all. There`s no `relay` found, just the electronics circuit which does the switching. It operates a similar way as a relay; it is possible to use a low voltage to switch a higher voltage or better than....
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This a simple stereo electret microphone pre amplifier circuit. For maximum performance, use solid capacitors or film capacitors and metal film resistors. Here the simple audio mic pre amplifier circuit based on single IC LM358. The circuit is very simple,....
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Stereo tube amplifier circuit which is built based 5 power tubes of 6SQ7-GT, 6V6-GT and 5Y3-GT. This circuit generates up to 4 watts audio output each channel..