A quick follow-up to How can I tell the frequency without an oscilloscope, or frequency counter?
My supply is a transformer plucked from a dead power adapter rated for 1.5A. This is rectified cap-filtered, then Vo manipulated through an LM317 with a pair of 1k linear.
I plan to tap the capacitor output to power the oscillator, and use the 317 output to bias the varactor.
Does the varactor bias supply have to be distinct from Vcc?