Absolute Value Comparator (CB21598E)

Based on common operational amplifiers, this circuit was found in Texas Instruments documentation. The power supply must be symmetrical.

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Mechanical Reverberator (CB23995E)
This mechanical reverberator circuit for guitar was found in the February 1970 issue of Radio...
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Found in an old English publication this circuit uses a dual gate MOSFET. Coils not specified....
Power Grid Data Receiver (CB4810E)
This is the receiver for the previous circuit transmitter. Similarly, no information about the...