I regularly receive emails from people wanting to know if I have any PCB’s to sell for the “Generator Board”, as described as part of my THD analyser project, here:http://www.users.on.net/~glenk/thd/thd.htm
The Generator Board is a switched-frequency state-variable audio oscillator that covers 10Hz to 50kHz in 1, 2, 5 steps. As detailed on my website, THD+N for the whole analyser is less than 0.0001% (-120dB; 1 part per million). The distortion of the Generator signal output by itself would be somewhat lower, but I simply lack the measurement capability at the moment to asses just how good it really is (I don’t have an analysers section with better performance than the Generator), but I estimate that it is typically in the order of -130dB to -140dB.
Schematic and Gerber files for the project can be downloaded from my site, but it seems most want ready made PCB’s. So, due to the number of requests (about half a dozen so far) I’m considering having a batch of boards made, but only if there is sufficient interest. I don’t want to spend $500 - $1000 if it will take 2 years for me to recoup my money.
So, the purpose of this thread is to test the water, so to speak. If I can get a list of, say, 25 people interested, I’ll go ahead and get a batch made. I would like to point out in advance that I’m not a charity and I will not be doing this for free or for part at my own expense (done that in the past and it was not a rewarding experience; will not be doing it again, ever). I Think I’d sell the boards for 2x what they cost me, plus a fixed postage fee to cover airmail.
I’ve had hundreds of boards made over the years through my places of work, but we traditionally use local suppliers such as Entech or IMP. I know these aren’t the cheapest options, so if this will come to fruition I’ll be open and appreciative for suggestions for alternatives.