Hearing aid amplifier (T1580E)

This circuit is from a 1947 Radio Electronics. The 4-tube circuit is battery powered and uses a crystal phone.

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Active Cycle Detector (CB6529E)
This circuit was obtained from a Popular Electronics of the 80's. It is set to a certain pulse...
Rail to Rail Oscillator 555 (CB9099E)
Found in an Electronic Design from the 80s, this circuit generates a 500 Hz signal and can be used...
ADuM120N and 121N Two Channel Digital Isolators (COM065E)
August 2016 - It can be purchased from Mouser Electronics the new digital isolators ADuM120N and...