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Joule Thief: JTBasic with Loopstick and Capacitor: Mode Switching

I took a standard loopstick 1-10 mHy variable inductor and wound a “primary” on top of the loopstick’s original coils. I used this arrangement as the inductor in my JTBasic testbed, with the 2n2222a…

Joule Thief: JTEnhanced Current Input, Voltage Output Waveforms

It doesn’t seem right to call it a basic JT since the loopstick and capacitor make so much difference. So I’m calling the cap/loopstick version “JTEnhanced”. It is the basic circuit, using the 1K…