Battery charger is important in electric system as it give back power to rechargeable battery. Circuit is good way in using SCR (Silicon Controlled Rectifier). SCR is strong, reliable and control well. It have four layers, three junctions and work like switch and rectifier. Small current to gate turns it ON and stay ON until […]
Simple Positive Voltage to Negative Voltage Converter Circuit
This article for Simple Positive Voltage to Negative Voltage Converter Circuits shows how to change positive DC voltage to negative DC voltage using special converter circuit. This circuit is useful for many electronic things. One famous and easy to use chip is IC 555 which is strong and works well. IC 555 are mostly used […]
Fire Alarm Circuit using Thermistor and IC 555
In fire time, the Fire Alarm Circuit using Thermistor and IC 555 help to find and warn people. This design uses IC 555 and thermistor to check temperature change and maybe fire. Thermistor is special part which feels the temperature change. Circuit is easy to make and thermistor changes resistance with heat. If hot then […]
Function Generator Circuit using IC L8038
Function Generator Circuit using IC L8038 is chip makes sine, square and sawtooth wave. It changes frequency using outside capacitor and resistor from 0.001Hz to 300KHz. Can change and sweep frequency with outside voltage. Gives strong and clean output and make all 3 waves of same time. Need few extra parts and work stable in […]
Simple Audio Level Indicator Circuit using IC LM3915
Simple Audio Level Indicator Circuit using IC LM3915 show sound strength with lights. Its display driver is good for sound visual circuits. It takes analog voltage and can light up 10 LEDs, LCDs or other displays in line. Here LED VU meter is used. Music lovers like it because it show sound level with lights. […]
Free Energy From Air Circuit
This Free Energy From Air Circuit uses free energy from air. Idea is simple as air is full of radio waves. When radio is ON we can hear static and even in empty place. So if we make strong power setup then air can give us endless energy. Circuit uses antenna, a good crystal diode […]