Hi makers. I am looking at making the Don Tillman preamp circuit available as a printed board for those who don't have experience in soldering up circuits. I've found the Tillman circuit to be very good for piezos and adding a preamp will make it the right impedance for amps and mixing boards while greatly improving the tone and output level. It also means you can add a proper tone control using a 25k pot and the usual cap. The board I have printed includes extra cap and resistor for greater FET tolerances, a tone/boost option, and a volume adjustment for matching a piezo with a mag pickup or bringing the output down (the Tillman gives plenty of level from a disc piezo and can be a little hot for some inputs).
The clearly labelled board alone would be $10 and the parts are easy to get. Board plus parts ready to solder in would be $20. Fully assembled - just needs the piezo, battery and outputs soldered on - would be $30. (Piezo, 25k pots, output jack, battery and battery holder not included).
Would come with set of instructions.
Any interest out there? I'd need to see a bit of demand to justify getting a sheet of them printed up.
cheers and Happy New Year
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Mike - it would come to about $30 AUD. Still not sure if I'll do them. Getting a print done is very expensive and I'd have to sell heaps of them to get my outlay back.
ok - will wait and see what happens , mike
What is the shipping to the uk Glen,
Andrew, I did all the sums and it just isn't worth it. The cost of printing out 100 circuits on a slab of board is too much. I have an elec engineer bud who sneaks the circuits onto the edges of prototype boards he gets printed, but doing a whole one of those myself is very marginally profitable. I can make more in one gig. Sorry for the false alarm. I'll take this whole thread down in a couple of days.
No problem Glenn.thanks