Mains Voltage Indicator with a LED.
I need an AC line 220V light display or main voltage monitor. Because the home ‘s electric of his brother a very often problem. Below a figure is the 230V AC voltage indicator circuit. We use the LED for display the power ac line, because cheap and convenient. The other …
LM338 / LM350  VOLTAGE REGULATOR CALCULATOR
You can use this calculator to vary the value of the program resistor (R1) and output set resistor (R2) and calculate the output voltage for the LM317 / LM338 / LM350 family of three terminal adjustable regulators. This calculator will work for most DC Voltage Regulators with a reference voltage …
USB Battery Replacement by LM317
My wife likes to listen to more music. But my son likes to play computer games a lot. At home we have a single computer. When ours son play game. The mother does not listen to music from our computer. Now the small mp3 player is very inexpensive, it can …
9V Low Power Switching Regulator by IC RC4193
This is the Power Switching Regulator 9V Circuit that is low current power output and It has strong point is the voltage input change from 2.4V to 10V but a constant voltage output 9 Volt. We used the RC4193 Micropower Switching Regulator is the base, easy to use and there …