Crystal converter (CB7327E)

This circuit was found in a Popular Electronics from the 90's. The circuit can be used to convert signals to frequencies up to 25 MHz.

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Window alarm (CB22540E)
This circuit was published in Radio Electronics Magazine in February 1958 using the well-known CK722,...
Audible TTL Probe (CB5907E)
This circuit was found in a 1980s documentation. The IC is the 7400 and should be powered with 5...
Gain 10 Amplifier 741 (CB14112E)
The voltage gain of this amplifier is 10 times. This gain is given by the relationship of values...