We found this circuit in a 1967 RCA SCR manual. The circuit uses components from the era. The bridge diodes must withstand the current of the controlled load.
The transistors of this timing circuit may be more modern types such as BC548 and BC558. The...
This 4.5 MHz amplifier is suitable for analog TV applications. We found it in a 1967 Philips...
Found in a 1968 US publication, this circuit is designed to measure very weak signals. The...