[sdiy] Digital Oscillators

[Sowa Roman]

Just want to tell how impressed I am with your 303 clone.
Looks like you design hi-tech stuff for a living.
I may be interested in getting one set of boards for it.

Do you use any hard to find parts like SMD tempcos
or unusual dual transistors? What size do you use? 0805?
Is it possible to get PIC firmware, or should I buy programmed
chip from you? Can I have the PCB files and make it locally
or you'd prefer to sell me boards?

Roman

""-----Original Message-----
""From: Mark Smith [mailto:Mark.Smith at pace.co.uk]
""Sent: Wednesday, January 09, 2002 5:00 PM
""To: 'synth-diy at dropmix.xs4all.nl'
""Subject: [sdiy] Digital Oscillators
""
""
""Hi,
""
""been synth DIYing for ages, but only recently joined the 
""group - Thanks Trev.
""
""I've spent the last year playing around and have completed 
""yet another 303 type clone. Unlike others I have seen I have 
""chosen to bypass the Midi - CV - VCO. The result is a single 
""chip ( PIC )  midi to DCO. Although it has been designed to 
""replace the original oscillator in a 303 it has many other uses.
""The circuit is pretty close to the original, other than the 
""level detect/schmitt bit is done by the micro. The 
""exponential current source is programmable - so as to keep 
""the amplitude constant. Thus I have a digitally controlled 
""oscillator which includes many of the original parts, but 
""keeps in tune. The design is entirely SMD, but for the J-FET 
""and Caps on the oscillator. If anyone is interested I could 
""re-lay and possibly get some boards made. Adding triangle / 
""sine wouldn't be a problem.
""
""pictures of my clones are at  
""http://www.meadowfield.freeuk.com/synth/synth2.html
""
""mark
""
""
""
""
""
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