Gain 10 Voltage Amplifier (T456E)

This 4-stage circuit has a voltage gain of 10 and negative feedback. The circuit was found in an old MIT publication.

Crystal Controlled Hartley Oscillator (CB14995E)
This circuit can generate signals up to a few tens of megahertz depending on the frequency of the...
Humidity Monitor (CB20963E)
This circuit was found in Radio Electronics from the 90s. The sensor is an oscillator whose...
Voice Suppressor (CB4751E)
This interesting circuit found in a European publication from the 1990s eliminates the voice that...