Reminder (CB9548E)

This circuit maintains on a flashing LED at a frequency determined by the capacitor. The unijunction transistor can be 2N2646.

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AM Detector (CB23780E)
The purpose of this circuit is to detect audio that amplitude modulates an RF carrier. The circuit is...
Crystal Filter I (CB19696E)
This crystal filter is normally used in receivers and the frequency depends on the crystal used...
RF Oscillator LM3909 (CB14292E)
We found this circuit in documentation from National Semiconductor. For the medium wave range the...