DTMF Decoder (CB25048E)

This circuit was found in the 1987 Radio Electronics magazine. The components used are integrated circuits of the time.

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Multitester (CB3834E)
This simple multitester tests continuity, semiconductors, leaks, and other common component...
High Input Impedance Amplifier (CB4027E)
This configuration can be implemented with equivalent operations. The circuit is from the 1990...
Tesla Coil (CB26185E)
This circuit is one of many that we have in our section. It was taken from the Electronics...