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.

Transistor gain meter (CB20522E)
This circuit was found in a publication in the 1950s, mainly applying to germanium transistors of the...
Universal AC Motor Control (CB855E)
This control is intended for 110 VAC or 220 VAC Motors. Any TIC series triac can be used according the power...
Solar spinner (CB20508E)
This solar cell driven circuit makes 4 LEDs run at a speed given by capacitor C2. The circuit is...