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 safety device to overvoltage . As per datasheet - TL431A is the three-terminal programmable integrated circuit . This is a shunt regulator diode. Look like a transistor. This monolithic IC voltage references […]
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 any Mechanical coil relay is used to Switching the Connected Load. Triac is used at the place of coil relay to switch ON and OFF. So this circuit […]
Delay Timer For Switch ON Supply To Any Appliance For Protection Delay timer is a device which is used to take some duration before switch on the main input supply to any equipment . This is a protection circuit to protect any electrical or electronic equipment and appliance from sudden high or unstable voltage. Delay timer take on hold the […]
Dual power supply circuit Some circuit required dual power for better operation like power amplifier, audio amplifier or other power circuit . That circuits made for operating with dual supply input voltage. Dual supply means- One terminal gives +ve. One terminal gives -ve and one is for ground . Two terminals gives +ve and -ve supply accordingly and third is […]
Electret Condenser Microphone Amplifier Circuit This is Another a circuit diagram of homemade MIC Speaker Amplifier using LM386. This is small and powerful for at low power supply . This is the Best and interesting circuit for beginner. In this circuit a transistor is used as preamplifier which make input signal noiseless and give input at ic at high gain. […]
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 LEDs in running mode one […]
Transistor is 3 Terminal electronic semiconductor component/device. It has three terminals named as 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 physical structure having property of resistance. A transistor has a 3 sandwich […]
Homemade MIC Amplifier Loudspeaker connection circuit You can connect condenser MIC with any amplifier circuit as given below diagram . This circuit will work very well with any type of Audio amplifier. Use only 5-6v for condenser MIC for best result. Audio amplifier circuit need 6-24v as per amplifier specification. Connect the positive terminal of mic with 47 k resistor […]
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 as this sequence by adding some more transistors. Q1-Q5= BC547 Resistors 1K-5, 22k-5 Capacitor 22uf 25v-6 Here is an another different circuit of 5 LED running effect […]
Simple Blinking Flasher LED circuit This simple led flasher blinker circuit made by using two npn BC547 transistor and some resistors and capacitors. The speed of blinking can be changed by changing the value of resistor R1 and R2. A preset of 100k should connect before the R1 and R2 for adjusting the speed of blinking the led. This […]
Easy , Simple and best FM transmitter circuit for homemade mini radio station Components Transistor- 2N3904-2 Resistor-1M-1, 470Ω-1, 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 transmits the input signal get from the microphone upto 500 meter range […]
Over-voltage and Under-voltage protection Circuit for High and Low Voltage Cutoff. This voltage sensor circuit can be used to protects the any appliance to voltage fluctuation . When input voltage goes high then the relay will activated and also when the input voltage is below then required level then relay activated. Note- Load is connected with NC and COM pin […]
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