This circuit is one of many of its kind that can be found on this site. This one is from a September 1987 Radio Electronics. The triac must be controlled according to the load.
This linear circuit was found in a 1965 Electronic Design. The transistors are from that time....
This TTL time base for 60 Hz or 50 Hz can be used in instrumentation circuits or even with...
This circuit was found in a 1980s documentation. Modern operational amplifiers can be used. The...