This reflectometer or standing-wave ratio meter (SWR) was found in a 1980s American documentation. The diodes support general purpose equivalents.
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...