This circuit was suggested by General Electric in a 1969 documentation. The transistors are of the time and the power supply is not given. Note the high supply voltage.
This midrange filter for sound systems was found in the May 1988 issue of Radio Electronics...
The figure shows how to couple two TTL circuits using an optical coupler to obtain isolation. The...
This circuit can handle 25 A unde a 32 V voltage using a hight power old transistor. This...