This car battery monitor was featured in the January 1988 issue of Radio Electronics magazine. The circuit uses common transistors and has 3 levels of indication made with common LEDs.
This circuit switches a load in 0.013 ms after closing the switch and after the start of each...
This circuit can be powered by 2 or 3 small batteries. The resistor can have values between 220...
The purpose of this circuit is to test power supplies functioning as a variable load that can...