LM741 Voice Filter (CB25936E)

This 300 Hz to 3.4 kHz filter was found in the May 1989 Radio Electronics magazine. The circuit requires a symmetrical power supply.

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Remote Dialer (CB24765E)
This circuit was found in the October 1983 Radio Electronics issue. It is applicable to old analog...
High impedance preamplifier stage (CB4683E)
In the figure we have a high input impedance stage with a general purpose PNP transistor. An NPN transistor...
12 V x 500 mA power supply (CB24154E)
Using the integrated circuit 723 we found this power supply in an article in the magazine Radio...