This circuit was found in an Elektor from the 90s. The circuit is critical, requiring a very well-planned layout for correct operation.
This circuit was obtained from an English magazine from 1979, but can be easily assembled today...
The circuit shown is from the SGS manual of linear integrated circuits of 1982. The L78xx is...
Suggested by the 90s ARRL Handbook edition, this circuit aims to reduce or cancel noise at the...