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.

Japanese Tone Control (CB1374E)
This circuit was found in a 1973’s Japanese magazine. It uses transistors of the time and is...
Tunnel Diode Grid Dip Meter (CB13338E)
This circuit is from a 1976 technical documentation, and there may be difficulties in obtaining the...
Timer 555 (CB24439E)
This circuit is given in two versions, having been found in a publication from the 90s. The second...