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Old 8th February 2006, 07:52 PM   #1
DD_Davo is offline DD_Davo  United Kingdom
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Default resistor capacitor values

Hi,

http://www.a-car.com/john/tone_control_simple.htm I intend to use that circuit for a basic preamp ive constructed however i want a large range in terms of trebel and bass. R2 and R1 for trebel are 10k and 1k. If was to use say 20k and 100r would there be a wider scope for trebel via the potentiometer, or would i need to change capacitance values also?

Thanks
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Old 9th February 2006, 01:16 AM   #2
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Here is what the circuit does without the proposed modification.
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File Type: jpg tone_control.jpg (85.9 KB, 80 views)
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Old 9th February 2006, 01:20 AM   #3
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And here is what it does with the proposed modification:
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File Type: jpg mod_tone_control.jpg (88.5 KB, 75 views)
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Old 9th February 2006, 01:26 AM   #4
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I used SwitcherCAD to simulate the circuit. The pots were split into two resistors whose values always sum to 100k. I stepped them from 1 ohm to 99999 in 10k steps.

You can do this sort of thing too by downloading a copy of switcherCAD for free from Linear Technology. It took me about 5 minutes to set up this simulation, and a fraction of a second to run it.

Note this type of circuit has a LOT of insertion loss- behavior will be affected by source and load impedances. I used 100K load Z which is probably higher than you will use in your circuit.

Here is the modified schematic:
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File Type: jpg tone_control_schem.jpg (42.4 KB, 74 views)
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Old 9th February 2006, 04:18 PM   #5
DD_Davo is offline DD_Davo  United Kingdom
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thanks ever so much! Downloaded the prog, seems ideal, just need to get acustomed to it. Would you mind sending me the schematic for the circuit since ive decided to add a mid control instead of altering the trebel/bass to save me from reproducing the original circuit?

Thanks again
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Old 9th February 2006, 07:32 PM   #6
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Here you go. Download the file, then change it's extension from .txt to .asc and you'll be able to open it in SWCAD.

I_F
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File Type: txt passive tone control.txt (2.6 KB, 8 views)
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Old 9th February 2006, 07:52 PM   #7
DD_Davo is offline DD_Davo  United Kingdom
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thank you ever so much
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