This 1968 Texas Instruments circuit uses diacs of the era. SCRs can be modern equivalents according to the controlled load.
An interesting basic circuit for projects is the one shown in the figure which consists of a...
This circuit produces a tone by a small loudspeaker. Frequency depends on C1 and C2. These...
This RF wattmeter was found in an American 1980s documentation. The components are common and the...