Geiger Pulsating Indicator (CB23617E)

This circuit is a suggestion from a Radio Electronics from October 1964. We found it in the patent section.

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3 kHz Notch Filter (CB13567E)
We found this circuit in a publication on operational amplifiers from 1978. The circuit is made...
Light intensity meter (CB7340E)
This circuit was found in a Philips documentation from 1970. The components are of the time,...
Bandpass Filter (CB6731E)
Found in a 1967 documentation this circuit can be applied to any operational amplifier. Components...