This circuit is from the 1990 Motorola Data Databook. The circuit can be implemented with equivalent transistors. The power supply must be symmetrical.
This 4-20 mA current interface was found on a 90's EDN. The components used are not common today and...
This Radio Electronics circuit, in an 80's edition, decodes the 67 kHz signal used at the time to...
This sensitive circuit detects the live pole of a power grid or outlet. The circuit makes use of a high...