This circuit was found in an Elektor from the 90s. Next to the circuit we have a table with the delays obtained when the circuit is connected according to the positions of the selector switches.
This circuit was found in a 1967 Delco Radio documentation. The circuit has an input voltage of 250...
Using L144 operational, this circuit applies to other equivalent operational. The circuit is from...
Found in a documentation from the 90s, this circuit limits and amplifies a voice signal in the 800...