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Author Topic: active guitar  (Read 4470 times)

UsableThought

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Re: active guitar
« Reply #15 on: February 03, 2016, 07:32:29 AM »
Voltwide, when I open the file in LTSpice, it complains "Couldn't find symbol(s) 'potentiometer 2" - both pots are therefore missing.

Is this 'potentiometer.sub'? And is that a model you built, or something I can find online in a library?


Googling I found this . . .

http://www.evolutionarytheory.com/downloads/LTSpice/Potentiometer.sub

. . . and copied it as a text file into both the same directory as gitpre.asc and also the "sub" folder inside my installation of LTSpce on Windows - however I still get the same complaint.


Also for these 2 pots, would they be audio taper, as with a traditional passive system?
« Last Edit: February 03, 2016, 08:08:42 AM by UsableThought »

voltwide

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Re: active guitar
« Reply #16 on: February 03, 2016, 09:40:45 AM »
If audio taper means logarithmic response, the answer is no. The spice potentiometer simulates a linear response.
This is the spice symbol I used:

UsableThought

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Re: active guitar
« Reply #17 on: February 03, 2016, 10:11:42 AM »
Thanks for the asy file - works.

As for the taper of the 2 pots - I figured the simulation would use linear - no point in getting fancy. I was actually asking, which type of taper you are using in your Strat?

Most players w/traditional tone controls prefer audio taper, but a few prefer linear for one or the other pot; and in this case I don't know your own preference, nor whether this circuit rewards linear taper in a way not usual w/a purely passive circuit.

voltwide

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Re: active guitar
« Reply #18 on: February 03, 2016, 06:09:47 PM »
This tone control shows a quite different response compared to the traditional pot - capacitor combination. I choose a linear response  for the TONE but a logarithmic for the VOL.

voltwide

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Re: active guitar
« Reply #19 on: February 26, 2016, 08:33:37 AM »
Finally the New Chinese Year celebrations are done and my pcbs (20x30mm) arrived today.
Later I will test and put one into my strat.

 

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