On Wed, 2 Dec 2009 17:19:30 +0000 Folderol <[email protected]> wrote:
> On Tue, 1 Dec 2009 21:46:32 +0100 (CET) > [email protected] (Karl Hammar) wrote: > > > Folderol: > > ... > > > My new millivoltmeter/dB meter is nearly finished - All I need now is > > > precision resistors 9M, 900k, 90k :? > > ... > > > > Can you publicise it so I can build me one also? > > > > Regards, > > /Karl > > It is simple enough, so as soon as I can find the time I'll draw out > the schematic and post it here as a PDF attachment. As promised, PDF attached. I haven't had time to make out any explanatory notes, but I think it's pretty straight forward anyway 0dB is variable so it can be set to whatever is convenient, hence temperature drift from using an ordinary diode as a reference is not important. -- Will J Godfrey http://www.musically.me.uk Say you have a poem and I have a tune. Exchange them and we can both have a poem, a tune, and a song.
Meter.pdf
Description: Adobe PDF document
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