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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1.5 kHz Notch Filter (CB13587E)
We found this circuit in a 1977 factory documentation. The operational amplifiers can be 741 and...
Voltage Switch (CB24969E)
This circuit with regenerative action was found in the June 1986 issue of Radio Electronics...
JFET Crystal Oscillator (CB19848E)
Equivalent FETs can be used according to the frequency of the crystal which can be up to a few...