Beta Meter (CB3804E)

This circuit uses a common multimeter on the voltage scale. The calibration of the scale should be done based on transistors with known gains.

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555 Alarm (CB4880E)
The phototransistor of this alarm can be of any type. The relay must be sensitive type according...
6 or 12 V x 1 A Regulated Power Supply (CB1168E )
This is the traditional configuration of a 6 or 12 V source with 7806 or 7812 integrated circuits, for a...
Triac and UJT Dimmer (CB857E)
This high power dimmer uses a unijunction transistor to trigger the triac. The triac is choosen...