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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Alternating Signals Operational Amplifier (CB19324E)
This circuit was obtained in an old European documentation. The integrated circuit used is...
Fluorescent Lamps Test (CB18603E)
The presented circuit is used to test ordinary fluorescent lamps. This circuit also has a mains...
Volume Expander (CB24739E)
Used in radio reception, this circuit was found in the February 1983 Radio Electronics magazine. The...