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How do i normalize output in this Circuit?
How do i normalize output in this Circuit?
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Old 12th June 2019, 11:26 PM   #1
Al1B is offline Al1B  Iran
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Join Date: Mar 2010
Smile How do i normalize output in this Circuit?

Hello .

i use below circuit with a 3DPT switch for switching between activating circuit and a bypass mode.

Click the image to open in full size.

because of the levels of amplification in the circuit, my levels of output (while active & by pass) differ a lot. whats the best way to normalize this? i thought maybe putting a pot in the output would be a good idea but i dont know how to calculate the amount.

any suggestions are appreciated.
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Old 12th June 2019, 11:55 PM   #2
rayma is offline rayma  United States
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Quote:
Originally Posted by Al1B View Post
i thought maybe putting a pot in the output would be a good idea but i dont know how to calculate the amount.
Change C8 to a 10uF bipolar. Add a 10k volume control in parallel with R14, taking as the output the signal from the pot's wiper. Adjust the 10k pot until the output and the bypass levels sound similar. This will keep all that nice distortion the same as well.

Last edited by rayma; 12th June 2019 at 11:59 PM.
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Old 13th June 2019, 09:01 PM   #3
Al1B is offline Al1B  Iran
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Quote:
Originally Posted by rayma View Post
Change C8 to a 10uF bipolar. Add a 10k volume control in parallel with R14, taking as the output the signal from the pot's wiper. Adjust the 10k pot until the output and the bypass levels sound similar. This will keep all that nice distortion the same as well.



thanks a lot.

Can this solution be used on other Pedals too?
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Old 13th June 2019, 09:21 PM   #4
rayma is offline rayma  United States
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Quote:
Originally Posted by Al1B View Post
Can this solution be used on other Pedals too?
Probably so, if the 10uF capacitor and 10k volume control are after the entire circuit.

Last edited by rayma; 13th June 2019 at 09:32 PM.
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Old 14th June 2019, 04:15 AM   #5
Gnobuddy is offline Gnobuddy  Canada
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Quote:
Originally Posted by Al1B View Post
Can this solution be used on other Pedals too?
Every guitar pedal I've ever owned has had an output level control. I've never even seen a pedal without one!

The reason is to prevent exactly the problem you encountered. You use the "Level" or "Output Level" knob to set the pedal to unity gain - now the sound is equally loud whether you bypass the pedal or not.

(The exception is when you actually want a signal boost from the pedal, of course. Maybe for switching from rhythm to lead, for instance.)


-Gnobuddy
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Old 15th June 2019, 12:32 AM   #6
Al1B is offline Al1B  Iran
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Quote:
Originally Posted by Gnobuddy View Post
Every guitar pedal I've ever owned has had an output level control. I've never even seen a pedal without one!

The reason is to prevent exactly the problem you encountered. You use the "Level" or "Output Level" knob to set the pedal to unity gain - now the sound is equally loud whether you bypass the pedal or not.

(The exception is when you actually want a signal boost from the pedal, of course. Maybe for switching from rhythm to lead, for instance.)


-Gnobuddy



yes , i've made other pedals with that volume control you mentioned, but in most of distortion/overdrive pedals my volume pots are so sensitive, i mean from 1-10 levels i can only use 2 at most.

is this common?





in other pedals i've bought , when pedal is activated volume does not differ a lot, but the tone and shape of the sound will.. and it looks a little bit more natural
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Old 15th June 2019, 02:44 AM   #7
Gnobuddy is offline Gnobuddy  Canada
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Quote:
Originally Posted by Al1B View Post
...in most of distortion/overdrive pedals my volume pots are so sensitive, i mean from 1-10 levels i can only use 2 at most.
Just double checking: are you using a log or a linear pot? You should be using a log pot. (A linear pot will be very "twitchy", very sensitive as you said.)

If even a log pot is too sensitive, you can add a fixed resistor in series with the pot, between op-amp and pot, to reduce the signal across the pot. This will make the pot less "twitchy".

The exact value of series resistor you need will depend on your circuit, but as a starting point, I would try a fixed resistor of about three times the value of the pot itself. From there, increase or decrease the resistor if necessary, until your output level behaves the way you want.

So if you have a 10k log output level pot, and it's still too twitchy, try using a 33k resistor in series with the pot. If it's still much too twitchy, triple that again, and try 100k in its place.

On the other hand, if adding the 33k resistor makes the pot too insensitive, you can, of course, reduce it: try 22k, or 10k, instead.

Hope that helps!


-Gnobuddy
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File Type: png Reduce_Pot_Sensitivity.png (8.5 KB, 34 views)
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Old 18th June 2019, 05:30 PM   #8
Al1B is offline Al1B  Iran
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thank you every one, with your complete explanations i fixed the output at the level i wanted.
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