JFET VCO (CB21133E)

This circuit was found in a Popular Electronics from the 90's. The frequencies depend on the components indicated in the table next to the diagram.

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Signal Follower (CB12222E)
This signal follower was found in a 1976 publication. The FET can be BF245 or MPF102 and any...
4069 Positive Triggering Flip Flop (CB19934E)
In the figure we have the way to control a flip-flop with the 4069 from positive pulses. The...
TTL Oscillator (CB12027E)
This circuit generates signals that depend on Ct and the 10k trimpot adjustment. See the math...