Debouncer (CB9277E)

This circuit was found in a 1967 American documentation. The switching diode (tunnel) used is an uncommon component today.

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Microphone balanced amplifier (CB9388E)
This circuit was found in an old American documentation. The integrated circuit used is uncommon...
DC Millivoltmeter (CB8213E)
This circuit was obtained from a 90s Radio Electronics. The value of R1 determines the scale...
Current Sensor LT6106 (CB5234E)
We found this circuit in the 2005 Linear Technology component manual. The circuit can be used as a...