Negative Feedback Stage (CB6131E)

This circuit is from a 1967 US publication. The configuration can serve as a basis for designs with modern components.

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Circuit Breaker with the LTC4213 (CB5900E)
This circuit was found in a 2005 Linear Technology documentation. The circuit is based on LTC4213...
1 kHz Band Pass Filter (CB19689E)
This filter has the components calculated for the frequency of 1 kHz but can be changed. The input...
Megaphone (CB994E)
This circuit works only with carbon microphones, due its low impedance. The speaker should be good or...