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imadrid imadrid
 
M$1 July 03, 2009 04:55 AM

How does a Capacitor affect a Potentiometer's tone. I plan to do a Greasebucket Tone control using a 500k Pot.

Fender stock capacitor values for the Greasebucket Tone control are:

Capacitor, Ceramic Disk 1uF, 50V
Capacitor, Ceramic Disk .02uf, 50V
Resistor Metal Film 4.7k Ohm, 1/4 watt

Do I need to change the cap values to suit a 500k pot?

My Fender MIJ Fat Strat. In stock form has Master Volume 500k and Master Tone 500k 1H223K green mylar capacitor .022uF, 50V.
Interesting Question?  Yes (1)   No (0)   

Interesting: krysstel

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wdawe wdawe
 
 July 03, 2009 04:58 PM
Theoretically yes if you want it to sound like the original Greasebucket tone control but practically it may not matter. Ceramic disk capacitors are notoriously for their poor tolerances so it's probably "good enough for rock and roll" :-)

If you are really interested your best option would be to model the circuit using pSpice which you can get for free here at the linear technology website. They offer SwitcherCAD as a free download which is a front end for pSPICE. Native pSPICE has a steep learning curve.

Check the sources for more info.
Source(s):
http://guitarnuts2.proboards.com/index.cgi?board=wiring&action=display&...
http://www.thegearpage.net/board/archive/index.php/t-210929.html

Asker's Rating:
• Didn't exactly get the answer I was looking for the exact capacitor values. The links and insights he provided was very helpful. Specially with the Forums discussion on a 3rd party site. Guitar electronics and Tone is very subjective. The one that I may be searching for may be unique or not document yet. I might as well just go for the mod and put on the web as soon I get it done.


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Helpful: imadrid, krusheasy

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imadrid imadrid
 
July 03, 2009 07:18 PM
pSpice is such an intimidating app to use. I'm an electronics noob. If you (or anyone) could please convert that Capacitor Values. I would greatly appreciate it.

Fender Wiring PDF's

Highway 1 Stratocaster
Wiring: http://www.fender.com/support/diagrams/pdf_temp1/stratocaster/0111120_22A/SD0111120_22APg2.pdf
Parts List: http://www.fender.com/support/diagrams/pdf_temp1/stratocaster/0111120_22A/SD0111120_22APg3.pdf

Highway 1 Telecaster
Wirings: http://www.fender.com/support/diagrams/pdf_temp1/telecaster/0111200_02A/SD0111200_02APg2.pdf
Parts Legend: http://www.fender.com/support/diagrams/pdf_temp1/telecaster/0111200_02A/SD0111200_02APg3.pdf

The Highway 1 Tele has similar Master Volume & Tone. But it came with a 250k pot just like the Strat. So I really can't just copy that.

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wdawe wdawe
 
July 03, 2009 11:25 PM
Let's see thumb up, based on my idea of what the schematic might look like, halve the values of the caps and double the value of the resistor. Full network analysis and schematic drawing is too taxing for my old brain.

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imadrid imadrid
 
July 04, 2009 12:58 AM
@wdawe

No need for a drawn schematics. I can figure out where to solder the caps. I guess it would be on the same place as it was intended with new values. If I understood it correctly.

I just need the value of the new cap values for a 500k pot.

Potentiometer 250k -> Potentiometer 500k
Capacitor, Ceramic Disk .1uF, 50V ->
Capacitor, Ceramic Disk .02uf, 50V ->
Resistor Metal Film 4.7k Ohm, 1/4 watt ->

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wdawe wdawe
 
July 06, 2009 09:51 PM
Sorry, I thought I gave you enough info to do the math yourself. Here it is. The exact values are half of 0.1uf which is 0.05 uf which is usually expressed as 50 nF but caps don't come in exact tens so 0.047uF or 47 nF is probably the closest value. 0.02 uF halved 0.01 uF or 10 nF. Double 4.7K is 9.4K but that's an off value, 9.1K is probably the closest. Capacitor and resistor math isn't that hard, good luck.

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