20W HiFi Amplifier (T496E)

Found in a 1947 publication, this 7-tube amplifier uses four tubes in the output stage. The circuit uses a power source with a transformer.

| Clique na imagem para ampliar |

Simple Thermometer (CB12042E)
The sensor in this circuit is a common transistor like the BC548. The circuit is from a 1979...
Two Transistor Relay Driver (CB11197E)
With this circuit it is possible to control a relay up to 100 mA with an extremely low input...
FM preamplifier (CB6911E)
Found in an Electronic Design of 1964, this circuit is intended to the signal amplification in the 88 to 108...