Telephone Ringer Amplifier (CB25751E)

For analog lines, this circuit was found in the August 1994 issue of Electronics Now magazine. The transistors are common general-purpose types.

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Multiplexed mixer (CB20762E)
This configuration from the 1970s can be applied to modern equivalent operational amplifiers. The...
Residential Alarm (CB9884E)
This simple alarm using only transistors was found in a 1990 publication. It can be powered by D...
Zero Crossing Detector for Magnetic Transducer (CB14157E)
The circuit presented was found in the 1994 National Instruments Linear Applications Handbook and...