This amplifier step for small signals can use any general-purpose transistor like the BC548. The circuit can be powered by voltages from 6 to 12 V.
We found this circuit in an old Mullard (Philips) documentation on the 555 and 556 integrated circuit...
This system makes use of incandescent lamps only and uses a SCR with a full wave bridge for powers...
This two-output circuit was found in General Electric documentation from the 1990s. The circuit uses...