Picoammeter (CB6192E)

This circuit was found in a 1980s Intersil documentation. The integrated circuit used is not common today. The power supply must be symmetrical.

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Rectangular Generator with Adjustable Space Mark (CB12079E)
This circuit was found in a 1978 publication. Equivalent operational amplifiers can be used. The...
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This instrumentation circuit was obtained in the National Semiconductor's Linear Applications...
Wien Bridge Oscillator (CB23602E)
This circuit produces a sinusoidal signal whose frequency can be calculated using the formula in...