Good morning guys,
I have played with a spark gap a bit. I have a 20W bulb in series with SG. I can get a very quiet spark as you said Med, but, it behaves almost like a short cut. It doesn't broadcast any RF, and the bulb doesn't lit. Also it seems to be not absolutely true "smaller gap = higher frequency" I could see how my frequency grows with bigger gap up to some point. I believe with small gap there might be high pressure of ionized air which blows the spark off or maybe partially shorts the circuit - like a leak-
Just F.Y.I some scope screenshots -the probe right next to the ETBC
Edit1: I have tried the small version of the ETBC - around 4-5 turns @ diameter 2cm ,5cm height. I do not see much difference in the frequency . It still shows around 50 KHz. To be honnest I do not think you can get much higher f from the spark plug. Yes, there are some harmonics at higher f too, but the primary frequency determined by SG is only at the range of KHz. I think. Also , when I hoover with small coil and the diode around the ETBC ,the diode lit only in the middle of the ETBC. This makes me think- shouldn't be the L2 coil in the middle of the ETBC? And maybe stack of Tesla's pancake coils?
I have played with a spark gap a bit. I have a 20W bulb in series with SG. I can get a very quiet spark as you said Med, but, it behaves almost like a short cut. It doesn't broadcast any RF, and the bulb doesn't lit. Also it seems to be not absolutely true "smaller gap = higher frequency" I could see how my frequency grows with bigger gap up to some point. I believe with small gap there might be high pressure of ionized air which blows the spark off or maybe partially shorts the circuit - like a leak-
Just F.Y.I some scope screenshots -the probe right next to the ETBC
Edit1: I have tried the small version of the ETBC - around 4-5 turns @ diameter 2cm ,5cm height. I do not see much difference in the frequency . It still shows around 50 KHz. To be honnest I do not think you can get much higher f from the spark plug. Yes, there are some harmonics at higher f too, but the primary frequency determined by SG is only at the range of KHz. I think. Also , when I hoover with small coil and the diode around the ETBC ,the diode lit only in the middle of the ETBC. This makes me think- shouldn't be the L2 coil in the middle of the ETBC? And maybe stack of Tesla's pancake coils?
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