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switchable tone circuit gain increase
switchable tone circuit gain increase
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Old 14th April 2019, 06:40 AM   #1
Pauld35 is offline Pauld35  New Zealand
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Default switchable tone circuit gain increase

here is a switchable tone circuit schem i mapped out,



im trying to let more signal through to the next gain stage.

dont want to messing with the rg 500k because there is already more than enough gain for the pre/ instrument in socket that will be added.


am thinking to swap out r1 and r2 the 460k & 33k for a 500k pot to set the gain then replace with fixed resistors again once i have the values.


im wondering if the large old style pots will handle the voltage of about 130vdc measured at the circuit in or weather it will fry?


and if trying to adjust these resistors, r1 and r2 for more signal gain will also effect the tone networks from functioning properly?
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Old 14th April 2019, 07:05 AM   #2
Mooly is offline Mooly  United Kingdom
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switchable tone circuit gain increase
The circuit as drawn is AC coupled at each end and so DC voltage will not make it through to any of the components making up the tone section.

Changing time constants (your pot idea) is bound to alter the response but I would say just try it and experiment and see if you can get the results you want.
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Old 14th April 2019, 07:44 AM   #3
Pauld35 is offline Pauld35  New Zealand
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Thanks Mooly,



I'll give it a go.
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Old 14th April 2019, 07:49 AM   #4
Mooly is offline Mooly  United Kingdom
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switchable tone circuit gain increase
OK Good luck.
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Old 14th April 2019, 08:09 PM   #5
Pauld35 is offline Pauld35  New Zealand
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havent changed circuit and tested yet, thinking just to lower the value of r1 and hopefully it wont change the sound.
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Old 15th April 2019, 09:46 PM   #6
Pauld35 is offline Pauld35  New Zealand
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Quote:
Originally Posted by Pauld35 View Post
havent changed circuit and tested yet, thinking just to lower the value of r1 and hopefully it wont change the sound.
swapping out r1 & r2 for a three terminal 500k pot as a voltage divider gave the best results.
it works very well along with the master volume settings. will leave the 500k pot as a permanent control.


changing just value of only r1 only gave good sound quality at a few settings
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Old 16th April 2019, 06:46 AM   #7
Mooly is offline Mooly  United Kingdom
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switchable tone circuit gain increase
Thats good, pleased to hear your idea worked out OK
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