We found this circuit in the April 1993 Electronics Now magazine. Almost any general-purpose JFET can be used. Power is supplied by a battery (2 x 9V).
We found this circuit on an Elektor from the 90s. The frequency is given by capacitor C1. The...
This linear LED scale circuit was found in the February 1992 issue of Radio Electronics magazine. Note...
This circuit is from the owner's manual of the integrated circuits used. The manual is old, which...