Switched analog buffer (CB9315E)

This circuit was obtained from an application note from Analog Devices from the 90s. The components are from that time.

Tuned audio oscillator (CB22254E)
This circuit is from a publication from the 50's. Inductive components are critical, and...
Stereo Pre Amplifier (CB18559E)
This simple two-transistor circuit used transistors from the 60s, having been found in a...
Capacítancemeter (CB3878E)
This circuit uses an oscillator that generates a signal of approximately 1450 kHz to test...