3-tube receiver 2 (T1603E)

Using known tubes, this receiver was found in a Radio Electronics from 1949. The circuit does not include the power supply.

Automatic gain control for audio (CB20640E)
This circuit was found in an American publication called Ham Radio. The circuit uses still current...
Alarm Siren 4001 (CB24363E)
This two-tone alarm siren was found in the January 1975 issue of Radio Electronics magazine. The...
Pulse Generator (CB5918E)
This circuit makes use of a transconductance operational amplifier. It generates signals with TTL...