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.
The integrated circuit used in this project is unusual. However, we can take advantage of the...
This circuit has 4 operating modes and was found in the 1995 Encyclopedia of Electronic Circuits...
The transistor of this oscillator can be 2N2222. L1 is formed by 9 turns of wire 26 with a socket...