Balanced Line Receiver (CB21211E)

Found in an Analog Devices documentation from the 90s, this circuit uses operational amplifiers from the time. The power supply must be symmetrical.

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555 Biofeedback Monitor (CB24775E)
This simple 555 biofeedback circuit was found in the December 1983 issue of Radio Electronics...
5 V high current power source (CB8705E)
Found in a 1969 EDN, this high current circuit, not indicated in the documentation, uses...
Unijunction Transistor Teste (CB1357E )
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