Microcontrollers are such semiconductor devices that act like a computer and can run any hardware level program written into it. You can program an microcontroller to glow a LED whenever […]
Automatic quick turn on LED in dark
Earlier I’ve showed how to reuse waste mobile batteries for LED lighting. There was darkness detector part built upon a switching transistor and a LDR. Since the switching transistor was […]
Simple LM358 OP-AMP based USB Li-ion charger
UPDATE: https://www.circuitsdiy.com/usb-li-ion-charger-revision This is a simple li-ion charger without a dedicated li-ion charger IC. This circuit can be used to efficiently and intelligently charge any single cell Li-ion battery pack […]
Inverter circuit project - up to 500 Watt
This is a complete inverter circuit project which features automatic mains switching, automatic charging when mains is present, and automatically starts inverter when mains is off. Get the full size inverter […]
Simple Water level indicator circuit using Logic IC
This is a simple water level indicator circuit which can be used to indicate water at 3 stages EMPTY, LOW and FULL by three respsctive LEDs. The heart of this […]
USB MP4 video player kit review
This is an outdated kit, no longer available. After a lot of search, finally I’ve found a USB/SD video player kit. This kit is priced a bit high at 480Rs(as […]
Super 3 stage resistor and continuity checker
The following continuity tester have a long range as well as mid and low range. There are 3 LEDs and they are for different ranges. The yellow one glows if […]
Simple Preamplifier for microphones, tape heads, etc
This circuit consists of a single transistor as amplifier and it gives a nice amplification to weakest and unipolar signals for feeding to a real amplifier. The center of this […]
Mosfet based PWM sinewave Inverter board PCB Layout
About 1 year ago, I’ve shared a circuit of Low cost PWM inverter circuit. In comments and emails I get many requests to provide an MOSFET based simple PWM circuit […]
Simple 3 Band Graphic Equalizer with BC548
This is a simple 3band graphic equalizer for audio amplifiers. There are three controls for three ranges, low frequency,mid frequency,and high; or simply for Bass, Treble and Mid range. This […]
- « Previous Page
- 1
- …
- 5
- 6
- 7
- 8
- 9
- …
- 12
- Next Page »