Multi-frequency amplifier (T447E)

This circuit is from old MIT documentation. The circuit has several steps for amplifying RF signals. The supply is made with 150 V.

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...