30W Amplifier (T1544E)

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

Accented Metronome (CB4369E)
We found this circuit in an English magazine from 1976. The magazine no longer exists, but just...
Backup for batteries (CB24731E)
The figure shows a simple way to have emergency power for a 9 V circuit powered by a source. If...
Voltage reference (CB21214E)
Found in an Electronic Design from the 90's, this circuit supplies voltages according to the...