We found this circuit in a 1969 General Electric documentation. The circuit uses transistors of the time and the diodes in the dotted board must be mounted on the output transistor heatsinks.
Found in American documentation from 1968, this circuit has an acute cut-off of the frequency to...
This simple circuit was found in the Spanish magazine “Todo Electronica”, in an edition of 1996....
This circuit of an old medical publication makes use of an integrated circuit of the time,...