Multiplexed mixer (CB20762E)

This configuration from the 1970s can be applied to modern equivalent operational amplifiers. The number of channels can also be changed.

Delay with UJT and SCR (CB21419E)
This circuit was taken from the 1967 General Electric SCR Manual. The circuit can use virtually any...
Speed control using tachometer (CB7157E)
Found in National Semiconductor documentation from the 1980s, this circuit employs a power...
9 V x 200 mA power supply (CB1159E)
The different aspect of this source is the use of a 12 V lamp as a current regulator together with a...