Quick Start Siren (CB25765E)

We found this circuit in the October 1994 Electronics Now magazine. The CMOS IC is uncommon these days and the output is low power.

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Digital Frequency Meter (CB16979E)
This circuit can measure frequencies up to just over 1 MHz and uses CMOS technology. The circuit is...
3-band Wien bridge oscillator (CB21808E)
This variable oscillator was found in a Mullard transistors manual from 1960. The resistor R5 is...
Quail Brooder (CB4467E)
This circuit, from a 1988 documentation, consists of an automatic temperature control using an NTC...