Direction Signal (CB25608E)

This circuit was found in the September 1993 Electronics Now magazine. It is based on the 555 and powers an audible indicator.

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Multiple Feedback Band Pass Filter MC3403 (CB15266E)
The operational amplifier used in this configuration is uncommon today, but more modern types can...
Dynamic Microphone Amplifier (CB4729E)
This is a circuit that appears several times in this section and in articles. It is a preamplifier for...
4046 Narrow-Range VCO (CB25755E)
We found this circuit in the August 1994 issue of Electronics Now. The 4046 is unusual today. The...