Refrigerator Monitor (CB26012E)

This circuit that detects when the refrigerator is not working properly was found in the February 1997 Electronics Now magazine.

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General Purpose Meter (CB23574E)
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Current Source with the LM143 (CB14270E)
The LM143 integrated circuit is a high voltage operational amplifier from National Semiconductor that is...
Hexadecimal display circuit (CB24921E)
We found this circuit in the November 1985 issue of Radio Electronics magazine. It uses TTL...