This circuit is an alternative version of the previous one also found in the July 1995 Electronics Now magazine. The triac must be equipped with a heat sink.
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...