The setting of this power supply is only 0.1%. We found it in a 1969 US documentation. Transistors may be current equivalents. Note the use of symmetrical power supply.
We found this circuit in 2005 Linear Technology documentation. The integrated circuit is LT1787...
We found this touch control on a Popular Electronics from 1970. The circuit makes use of an...
This circuit was found in a 1966 EEE. What it does is it converts the logic levels of 0 V and +4 V...