17-04-2012, 06:07 PM
Al is right about the input imp. of the fet so little loading on a standard homebrew coil/capacitor parallel tuned circuit at resonance...much better, traditionaly a low gain device is better for regen. (smoother in/out operation of regen.) as already said if tickler coil is coupled to closely it will squark like a good 'un and can really hurt your ears if using the old style tin diaphragm 'phones, traditionaly a 2.5 mh choke would be fitted in the collector or anode circuit (I guess it would work also with the FET, the RF end of that would go to the tickler coil, this results in less turns required in that coil, the cold end of the coil could then be throttled to earth (-ve)_by using a pot via a blocking capacitor (RF frequency) or variable capacitor instead of a pot, either way the shafts can be earthed (-ve) thus reducing any proximity effect caused by your hands.
Hope this is of some use.
Lawrence.
Hope this is of some use.
Lawrence.
