This balance control for the channels of a stereo system was found in a 1969 Mullard documentation. The transistors may be the modern BC548 equivalents.
This circuit was found in a Motorola documentation from the 70s. The integrated circuit is from...
This circuit was obtained in a documentation from the 80's. However, using TTL it is still modern,...
This circuit converts an AC signal into a voltage of the same peak value with precision and is...