Found in an Electronics World of 1968 this circuit can use current SCRs and the diodes are according to the lamp. The Circuit only works with incandescent lamps.
This 80's General Electric circuit is guarded by the noise-guard for operating current. The...
The gates of a 4093 can be used form a two-tone siren as shown in the configuration of Figure. The...
This old 4-channel circuit was found in the December 1994 Electronics Now magazine. The circuit uses...