2 Χ 100 watt Stereo Audio Amplifier using STK4231 II If you want to make a HI FI 100w High Power Stereo Audio Amplifier Then You can use this ic. STK4231 is a hybrid Thick film IC manufactured by SANYO ELECTRIC CO. LTD JAPAN. The STK4221II IC from is a dual high power amplifier chip, preferably […]
STK4231 II 100w + 100w Stereo Audio Amplifier Circuit Read More »
Dark/Light Activated Circuit using LDR The dark sensor circuit is very useful to automatically switch ON and OFF any appliance by Detection of Light and Dark. LDR is a photoresistor that is used for the detection of light. When Light intensity is high on LDR, The Resistance through it decreases, and When Light intensity is
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3 LED flasher circuit using transistor Here is another type of LED flasher circuit but this circuit is also about the same as my previous led chaser, here is some change in this circuit. This is a Very Easy and beautiful LED chaser that is made using without any ic. only transistors, capacitors and resistors
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12v CFL Inverter circuit for Emergency Light This is a small power inverter circuit that produces 230v ac at the output through the transformer. The circuit is designed by T.Kalpana. This can be used as the emergency CFL lighting, CFL needs AC input for operating and this circuit provides the AC to CFL. This circuit
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12v battery charge level indicator circuit led bar graph The LM3914 is a monolithic integrated circuit that senses analog voltage levels and drives 10 LEDs, providing a linear analog display. This ic is used for Dot and Bar Display. A single pin changes the display from a moving dot to a bar graph. The current
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Power bank For Mobile/Smartphone What is a Power bank When we go away from home then I face a very common problem, that is power backup of mobile phones. During travelling, it is a very common problem to get regular power backup.  If you’re traveling or out you won’t have a chance to recharge your device,
Homemade Powerbank using Li-ion 3.7v Battery Read More »
Over-voltage Protection circuit using TL431 Shunt Regulator IC This circuit protects from high voltage. Automatic Equipment disconnect when the power cross the level of a fixed voltage. This is a safety device to overvoltage. What is TL431 The TL431 is a three-terminal adjustable precision shunt regulator integrated circuit (IC). It is commonly used in electronic
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Solid State Relay/ Optocoupler Relay Solid State Relay is a type of switch to activate Load by using without any Mechanical parts. In this there is only semiconductor devices used, no Mechanical coil relay is used to Switching the Connected Load. Triac is used at the place of coil relay to switch ON and OFF.
Solid State Relay With Triac And Optocoupler Read More »
Delay Timer For Switch ON Supply To Any Appliance For Protection Circuit 1 power on delay timer circuit The delay timer is a device that is used to take some duration be]fore switch on the main input supply to any equipment. This is a protection circuit to protect any electrical or electronic equipment and appliance
Delay ON Timer circuit using transistor Read More »
Dual power supply circuit Some circuits require dual power for better operation, like a power amplifier, audio amplifier, or another power circuit. Those circuits made for operating with dual supply input voltage. What is a Dual Power Supply? A dual power supply is an electrical circuit that provides two voltage outputs, typically one positive and
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Electret Condenser Microphone Amplifier Circuit This is another simple circuit diagram of a homemade MIC Speaker Amplifier using the LM386 audio amplifier IC. It is a compact yet powerful amplifier designed for low-power applications. This is one of the best and most interesting circuits for beginners. In this circuit, a BC548 transistor acts as a
Best Low power Mic Amplifier circuit using LM386 Read More »
Colour Changing LED chaser circuit using Bicolour LED Here i am presenting a circuit of 10 dual colour LED flasher (Not using Flashing LED) which blinks one by one in sequence. This circuit is based on popular counter circuit using 4017 and 555. One colour of all LED remain fix and second colour of all
Dual colour LED chaser using NOT Gate inverter Read More »
 How transistor works Transistor working simple Transistor is a 3 Terminal electronic semiconductor component/device. It has three terminals named a BASE, Emitter, And Collector. Transistor name meaning lies in its own working. Trans + istor = Transistor The prefix trans tells about signal transfer from low resistance to high resistance part and istor means solid
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 Condenser mic audio amplifier how to make a microphone amplifier circuit You can connect a condenser MIC with an amplifier circuit as given below diagram. This circuit will work very well with any type of Audio amplifier. Use only 3-6v for condenser MIC for the best result. The audio amplifier circuit needs 6-24v as per
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Simple LED Flasher/chaser/Blinker Circuit This circuit is made using 5 NPN transistors, some capacitors and some resistors. 5 LEDs are blinking as shown in this video gif. you can connect more LEDs to this sequence by adding some more transistors. Q1-Q5= BC547 Resistors 1K-5, 22k-5 Capacitor 22uf 25v-6
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 2 Led Flasher circuit Simple Blinking Flasher LED circuit This simple led flasher blinker circuit made by using two npn BC547 transistors and some resistors and capacitors. The speed of blinking can be changed by changing the value of capacitors C1 and C2. This led flasher circuit is very easy and simple and there is
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Easy, Simple and best FM transmitter circuit for homemade mini radio station  Homemade FM Transmitter circuit diagram Components Transistor- 2N3904-2 Resistor-1M-1, 470Ω-1, 22k to 47kΩ-2, 10kΩ-1 Capacitor-1nf-1, 0.1uf-3, 10pf-2, 33pf-2 Inductor- 4-5 Turn of 4 mm dia air core coil of copper wire Condenser mic-1 This simple and easy FM transmitter circuit can transmit
500m FM transmitter circuit Read More »
High voltage Protection circuit This is a high-voltage Protection circuit that protects the circuit from high voltage to any device by the automatic cutoff using the popular ic 741. Note- Connect the load with the NC pin of the relay When the input voltage at Non- the non-inverting pin of op-amp 741 is crossed over
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 Overvoltage autocut circuit diagram This Autocut circuit is very easy, simple, and very useful. Only one transistor and some other components are used in this high-voltage protection Auto circuit. The load is connected with the NC (normally connected ) Pin of the relay. This circuit is a very useful auto-cut circuit to protect any electrical
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1.5 A Adjustable DC Variable Voltage Regulator Using LM317 ic  lm317 voltage regulator working The LM317T is an adjustable three-terminal positive-voltage regulator. This regulator IC capable of supplying more than 1.5 A over an output-voltage range of 1.25 V to 37 V. To set the output voltage it requires only two external resistors. Resistors R1
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1.25 v to 32 v 10 A Voltage Adjustable regulator Circuit By this Regulator, circuit Output Load Can be connected up to 10 A Load. The output current is 10 A of this circuit. The LT1038 is a three-terminal adjustable voltage regulator which is capable of providing of 10A output high current at 1.2V to
10A High Current Adjustable Voltage Regulator using LT1038 Read More »
Electronic Fan Regulator AC Light Dimmer circuit Resistive fan regulator We first discuss the conventional big-size resistive fan regulator. Conventional Old ceiling fan regulators use resistive wire to connect in series and there are multiple points to connect the regulating knop switch to adjust the speed. This type of regulator works on a full resistor
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