30W Amplifier (T1544E)

This hi-fi amplifier is from a 1975 RCA tube manual. The critical components are the transformers. Power supply is included.

Product Detector (CB22036E)
Intended for SSB and CW reception, this circuit was found in old English documentation. The...
Low Consumption Alarm (CB19226E)
Using two transistors, the resting current for this alarm is 25uA. The circuit was found in an...
Rain alarm (CB20776E)
This simple rain, leak or moisture detector circuit appears in other places on this site with...