Found in a 90s QST magazine, this circuit uses components from that time. No information is given about the transformer.
This signal follower was found in a 1976 publication. The FET can be BF245 or MPF102 and any...
In the figure we have the way to control a flip-flop with the 4069 from positive pulses. The...
This circuit generates signals that depend on Ct and the 10k trimpot adjustment. See the math...