Low noise amplifier (T466E)

Found in 1948 MIT documentation, this 4-tube amplifier is characterized by its low noise level.

Transistor Hartley Oscillator (CB4576E)
This circuit consists of a single Hartley oscillator using a bipolar transistor that can generate...
Safety Light (CB4785E)
This circuit turns on your car's backlight when a vehicle coming from behind gets too close to it...
30 to 45 MHz Receiver (CB20514E)
Used by the police this receiver tuned to the low VHF band. The circuit is from a documentation from the...