This circuit has a sensitivity of 2uW. We found it in documentation from the 1980s. The integrated circuit is from that time. Equivalents can be tried.
This circuit was obtained in a 1982 English magazine. The purpose of this circuit is to make an...
This is a change from the previous interface, also used an uncommon operational one today. The...
This circuit uses a capacitor to momentarily reduce the anode-to-cathode voltage of the SCR for...