This very low power amplifier is designed by Amperex for hearing aids. It is based on TAA370 which is not an integrated circuit that can be found today.
The figure shows how to obtain a digitally programmed resistance using the 4066. The circuit is...
This circuit was found in a 1966 General Electric documentation. It makes use of direct contact...
This circuit for controlling AC loads in the power grid was found in a 1967 Electronics World. The load...