FET Constant Current Source (CB6622E)

We found this circuit in a 1968 US documentation. The power FET is a component of the time and the current is 4.5 mA only.

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Gain 50 Current Sensor (CB5388E)
We found this simple gain-50 current sensing circuit in a 2005 Linear Technology publication. The circuit...
Logarithmic Amplifier with Operational (CB13772E)
The circuit presented was found in a Motorola documentation from 19761, but it can be assembled with a...
Micro amplifier (CB9066E)
This microphone amplifier operates on battery voltage. The output is in an earphone. The...