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Registered Member #15
Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
actually, i had some early breadboard tests this evening and it works quite well. most of the noise pick-up from the coil (which is very low duty cycle) can easily be filtered out. even the stuff that makes it through can be eliminated by putting a big RC filter on the DC output of the circuit. Since the changes due to coil operation (200kHz) is much much faster than any changes made from hand movement.
my new circuit uses digital logic running at about 5MHz and has two antennas providing PRF control and Pulsewidth control.
I menitioned to Dan some digital control circuits using Theremin circuits for robot control on that other list. But tonights testing here looked like "it" would be a disaster:
Mostly for the problems Steve Conner predicted earlier.
But it sounds like Dan is reporting good results tonight and I think he is a RADAR design guy, so maybe he has "tricks" that will work )))
The circuit Dan posted earlier has three analog filters mixed into the digital (Satanic things ) that might do the trick. Mine has zero filters. But maybe the digital/analog hybrid can resist the Tesla coil enough to work!! Hope So!!!
The key is that the 4070 they use is directly filtered for low frequencies after the hetrodyne. Keeps the "slow" hand movements, while "loosing" the Tesla coil frequencies. ThereminVision filters far later (too late). Good for machine control, but bad for Tesla coil noise. You "might" have to use a second order filter, but it depends on the range you need... I think Dan's can use "slow" DC and synthesize back to the audio range from there, so he just throws out the middle man noise.
Cool!!!
You will need TVSs in parrallel with the timing caps on the input. They will do no harm since the frequency shift from the little added capacitance just adapts. I think they are a don't care for the 4093 input compared to 22pF, but the 4093 inputs just don't like "shocks". With a well placed TVS, they might take a direct hit, in your dreams :o)))
Registered Member #15
Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
Additional testing has yielded some problems. I may go with an optical version instead. Although, i'll have to figure out a way to cancel out the effects of ambient light. Should be interesting . . .
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[moved] The Theremin DRSSTC Controller . . .
)))
) that might do the trick. Mine has zero filters. But maybe the digital/analog hybrid can resist the Tesla coil enough to work!! Hope So!!!