Suggested by Amperex in 1968, this circuit is intended for hearing aids. The integrated circuit used, a TAA370 is not common today.
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...