Very low resistance static relay (CB8832E)

Found in a 1965’s Electronic Design, this circuit operates with a voltage of 1.5 V. The relay can be of a reed relay or other type.

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Two-tone decoder (CB8719E)
Found in a 90s 73 magazine, this circuit uses an unusual component today which is the XR2206. |...
Picoammeter (CB9661E) This circuit is designed to measure very weak currents, in the order of picoamperes. We found it in an American documentation from the 80s. The integrated circuit is from that time. a h
Picoammeter (CB9661E) This circuit is designed to measure very weak currents, in the order of...
Security switch (CB8514E)
This shield circuit was suggested by a 90s Popular Electronics. The circuit can use either a triac for a...