First pulse preserver (CB9259E)

This circuit was found in a 1967 EEE. The components are from that time, but the circuit can be implemented with modern equivalent components.

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Function generator (CB7594E)
Found in a 90s 73 magazine for radio amateurs, this circuit makes use of common operational...
Current Booster (CB6973E)
We found this circuit in a Popular Electronics from the 90s. Transistors can be modern...
VCO with 4046 (CB25753E)
The 4046 PLL is uncommon these days. This circuit was found in the August 1994 issue of...