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 is a reservoir level control project, in this case, using 4 sensors so that 4 different...
This circuit, obtained in a 1994 documentation, uses an SCR in a relaxation oscillator to raise the...
The power supply shown in the figure provides voltages between 0 and approximately 15 volts, with...