Microphone 8 W amplifier (T369E)

This circuit was found in the 1961 RCA tube manual. The 4-tube circuit is suitable for microphones and record players with high impedance input.

Night Switch (CB491)
This circuit turns on a lamp when the night comes and turn it off in the morning. The circuit...
T850 Switche with 8 A Triacs
August 2017 - STMicroelectronics' new T850 switches with triacs up to 8 A can be obtained from...
5 ms delay (CB1475E )
The circuit shown was obtained from a 1976s publication for radio amateurs. Its purpose is to...