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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I'm interested, I've been wanting to try one but haven't got around to it. I wonder what shipping would be to the States?
It would be very little, maybe $4 or so.
I'd take one
Deal me in as well!
glenn - you know i love these preamps and at $10 for the board i'd be in for a half dozen or so - what's the blue square resistor?
That's a volume trim pot. Sometimes the output of the Tillman, especially with disc piezos, is a bit hot for some inputs. Also if you are ganging a piezo with a mag pickup, the Tillman may be a bit louder. You can tweak the trim to match them up.
There's a spot for putting in a treble booster 0.05uf capacitor too if for some reason your tone is a bit muddy. I've only had to use it once but it was a lifesaver.
OK...we're getting there. Would need to see a few more potential buyers before I spring for getting a whole sheet printed.
OK, thanks for your interest. I've checked out the costs and the only way I can justify the time and outlay would be to sell fully assembled units at $25. You'd have to solder on a piezo, battery and output jack (not included) and if necessary make a battery holder and access panel. All very easy. So still interested?
I'd still like a couple
sorry glenn, can't justify that cost
cost of a complete one and posted to uk ????? cheers, mike