Mini amplifier (CB21697E)

The indicated fraction watt amplifier has good gain, requiring only 100 mV input for full power excitation.

DC-AC converter (CB12410E)
Published in 1988 in Hands-On Electronics, this circuit converts the 12 V of a battery into 120 V...
Tachometer with the LM3900 (CB4030E)
The circuit presented is from the Motorola Linear Databook of 1990. The integrated circuit is a...
Continuity Tester (CB15938E)
This simple circuit operates with only 1.5 volts of a battery and detects low resistance making a...