High impedance millivoltmeter (CB20611E)

We found this circuit in an old American documentation. The components are from that period and may present difficulties in obtaining them.

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Astable Multivibrator (MSB016E)
This is the traditional configuration of na Astable Multivibrator using two NPN ttransistor....
Common Source HFET Amplifier (CB25569E)
This circuit, which combines a bipolar with any JFET, was found in the April 1993 issue of...
Operational Notch Filter (CB18978E)
This filter was found in a Texas Instruments manual based on an operational amplifier 741. Other...