This 1967 Electronics World circuit is suitable for frequencies up to 1 MHz. The setting applies to virtually any junction FET.
We found this circuit in a 1998 publication. The circuit has controls for both frequency and...
This preamplifier is intended for the use with magnetic pick-ups. Power supply must have voltages...
Using a CA3059 this circuit was found in the July 1995 Electronics Now magazine. The triac must be...