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Title: theramin circuit Post by: kz0e on May 09, 2006, 11:42:51 PM Hi Guys,
A friend is into theramin's and has asked for help coming up with a solid state replacement for a theramin circuit that uses a '120' triode. I havnt seen the schematic yet but I understand it's set up with rf into the filament, and supplys cathode current into an amplifier stage, sounds like an rf power to dc current converter to me. Anyone seen this before or have any tips/info? I wonder if it doesnt have some nice and funky transfer function or special distortion that contributes to that 'theramin sound' that might be tough to reproduce. I guess those 120 tubes are up to $60 a piece. Larry Title: Re: theramin circuit Post by: Rob K2CU on May 10, 2006, 12:43:32 PM Check out the following:
http://www.thereminworld.com/schematics.asp http://www.rogo.com/folkstuff/theremin.html http://home.att.net/~theremin1/ Title: Re: theramin circuit Post by: N0BST on May 13, 2006, 07:15:58 PM How about using an optocoupler instead? Use a transistor to vary the intensity of the internal LED. Or he could use a lamp and photoresistor combination.
Scott Title: Re: theramin circuit Post by: wavebourn on May 18, 2006, 10:04:29 AM My humble opinion: this one is the best. AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
http://www.oldtemecula.com/theremin/ultimate2b/index.htm |