Hobby Electronics Circuits

Below is the schematic for a 2 digit 7 segment display using an microcontroller to drive them. This can be used also for large 5 inch LEDs....

Someone asked me for a circuit for vibration or sound activated switched in a forum. I had drawn this quickly by hand. The sound is detect...

This circuit converts 3V input to be connect to 5V or TTL device. This is a very simple common-base configuration circuit and uses 4 compon...

This is the circuit for Telephone Ring Indicator Using LED Lamp. The telephone ring is typically 90VAC RMS so is more than enough to light ...

To connect a single LED lamp to the 220V AC line, the minimum need are a series a high voltage capacitor and a resistor. A diode also in pa...

This is a very simple 2 transistor circuit. It is very easy to construct. The parts can even be soldered without using a PCB. This can be ...

I have create a new electronics and programming blog . Here I will post electronic projects, circuits and codes. Please visit this site.