Posts by Syed Saad Hasan

A Printed Circuit Board or PCB connects electrical components using tracks instead of wires. To fix the electronic components in position, h…

Building a basic LED circuit is the very first stepping stone for every electronic enthusiast, hobbyist & student. It is probably the first…

Astable Multivibrator circuit mode for 555 timer IC is also called Free running or self-triggering mode. It doesn’t have any stable state it…

What are Frequency Dividers? Frequency Divider Circuit is a circuit that divides the input frequency by n (any integer number), which means…

What is Strobe Light? A strobe light or a stroboscopic lamp is one that can produce regular flashes of light. So in this tutorial, we are go…

What is a Voltage Doubler? The Voltage Doubler is the circuit where we get twice 2x of the input voltage if we supply 5v, we will get 10 vol…

The fridge door alarm circuit is used to sense the status of the door opening OR closing. When the door opens for a long time this circuit t…

What is Roulette? Roulette is a casino game named after the French word meaning little wheel. In this game, players may choose to place bets…

What is a Timer? A Timer is a control device that outputs a signal at a preset time after an input signal is received. So in this tutorial…

A joule thief is an electronic circuit that takes in a small voltage and turns it up to a higher voltage (for devices like LEDs, which requi…

A DC power supply takes AC from the wall outlet, converts it to unregulated DC, and reduces the voltage using an input power transformer. ty…

A headphone amplifier is a relatively low-power amplifier that boosts the low-voltage audio signal from a source device (be it a turntable…

A Microphone preamplifier is an electronic circuit that serves the purpose of pre-amplifying weak audio signals. When the audio source (usua…