Tunnel diode simple noise generator (CB23705E)

This circuit was found in Radio Electronics magazine from November 1960. The circuit is powered by a photocell of the time.

TTL Data Transmission (CB16024E)
The circuit shown in the figure is suggested by Texas Instruments and allows data transmission on TTL devices...
Vibrato (CB3823E)
We find this vibrato configuration with transistors in a 1987 documentation. The components are still...
Quadrature Outputs Sinusoidal Oscillator (CB13232E)
This circuit, from a documentation from the 1970s, produces two sinusoidal signals given by C2 and...