Posted inUSB
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This is an outdated kit, no longer available.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…
Posted inOthers
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…
Posted inAmplifier
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…
Posted inInverter
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…
Posted inAmplifier
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…
Posted inGadgets
Make power saver circuit to cut down electricity bills
There are some power saver devices shown in TV advertisements that they can save electricity bills. But, does they really cut down electricity bills as advertised? Does they really cut…
Posted inInverter
Automatic Inverter and Mains Supply Changeover Circuit
There are many types of Inverters to build. Once you build one inverter, you can light bulbs, or other electrical equipments by battery. But, you had to do a boring…
Posted inLED Driver
Reuse Old Mobile Phone Battery for LED lighting
Do you have old unusable Mobile battery? Normally mobile batteries have a lifespan of 2-5 years under normal usage. But then we have to replace them. Nowadays there are cheap…
Posted inInverter Oscillator
Simplest Modified SineWave Inverter without Microcontroller
There are basically three types of Inverters in the market. These are, Squarewave Inverter Sinewave Inverter Modified Sinewave Inverter Waveform Comparison Most of the inverters in the market uses modified…
Posted inMicrocontrollers USB
2$ DIY Low cost USB Oscilloscope
Were you going to buy a 100-1000$ valued USB oscilloscope? No need of that when you can make one at just 2$. An Oscilloscope is a device which can analyze…