30W Amplifier (T1544E)

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

Sensitive Light Relay (CB14635E)
This circuit makes use of a sensitive 5 mA reed-relay to be driven directly by a phototransistor. The...
6V battery charger (CB6400E)
This circuit was found in a 1967 RCA manual. The transistors are of the time. The adjustment is made to...
20 W amplifier TDA1520Q (CB16670E)
This powerful amplifier was part of commercial sound circuits from the 90s. The integrated circuit...