[i]"FredM, So, I guess all of what I was looking at were ICs, and not memory or processor based chips then. Still, those things alone would make the EPro difficult to say the least to reproduce." - Thomas [/i]
Hi Thomas,
Not a problem - I did not know how you came to the conclusion you did - and because of your connections with Moog I wrongly assumed that the information regarding the E-Pro had come from them.. I am glad that this was not the case..
With regard to the idea of cloning an E-Pro, and the validity thereof.. There are things the E-Pro has that no other Theremin currently has, and which people want. Is it worth ‘cloning’ the instrument? – I personally don’t think so.. because I have my own ideas, and because I want my Theremin to be better than the E-Pro.. However .. I probably only take this view because I am in the last “half mile” of a marathon which has taken 3 years of massive effort.. If I had started with knowledge of the E-Pro ‘modus operandi’ I may well have chosen the ‘cloning’ route.. The avoidance of digital heterodyning put me on a path to much more complex schemes which have taken years of development.
But for someone who wants to make an instrument equivalent to the E-Pro, and bring this to market, I do not think there would be too many problems* .. It would certainly be cheaper (particularly in terms of development costs) , simpler, and quicker than taking the route I did.. And certainly, for a ‘hobbyist’ with a lot of experience / knowledge/ equipment, “cloning” an E-Pro from the basic ideas given in Basics of Epro (http://www.thereminworld.com/forum.asp?cmd=p&T=4547&F=3) and its following thread would be a great project – but a lot of work.
*The major 'problem' with cloning an E-pro relates to the wide range of skills required.. The oscillator designs are critical for stability, and this, I think, is going to be the most difficult area to perfect (particularly for production - for a one-off, a constructor could spend weeks perfecting the front end on a 'select-on-test' basis, and get it 'good enough' - but it is an entirely different matter when production is the goal).. There are many good digital designers, and (not quite so many) good analogue designers, and (even less) designers able to master the 'RF' stuff .. But few designers / developers with mastery of all the disciplines required to develop an E-Pro clone for production.. One would probably need a couple of designers with overlapping skills to do the job well, particularly if the goal was production rather than a one-off.
Would it be worth doing from a commercial perspective? – Probably not! Anyone capable of cloning an E-Pro and optimizing it for production (reducing component count by using programmable logic or ASICs for example) could probably make more money just working as a designer/developer, without the risks and hassle. In the time it took to bring the clone to market, they are likely to earn more money than they would make from sales of the ‘clone’.. This was brought home to me in discussions with the designer of another highly prized Theremin which is no longer being made.. Even having a Theremin nearly ready to roll, and a crowd of purchasers ready to part with their money, the ‘crowd’ is likely to be too small for production to be risk-free or make commercial sense.
So it is only fools like me (and others with manic disorders or OCD! - or who, like me, have health issues which make 'conventional' employment difficult ) who are likely to pursue the “high end” Theremin idea – just like those who build tube Theremins or other exotica.. there is no ‘sanity’ (and certainly no business sanity) in doing this stuff.. My meetings (as few as possible!) with my banker, going over my “business plan” are like something from a Monty Python sketch.. I can now see what they have seen – but keep going anyway, because I’m mad! (oh.. I only manage to keep my 'business advisers' from gi