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Post subject: Is my wiring correct ? (Clapton mid boost with MODS)
Posted: Thu Apr 14, 2011 7:32 am
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Hi, I bought the eric clapton mid boost and I want to put it in my american standard.
But I don't want the TBX tone control, I prefer a master tone with a (no-load), and I've tried to put some switches to cut off the mid boost when I want and go back ton a passive guitar. I think that I'm obliged to put 2 switches and one On/Off.

Have a look at the schematic I made :

http://www.hostingpics.net/viewer.php?i ... fie769.jpg

Do you think it's correct ?
Can I do something to reduce the number of the switches ? And which type of switches should I use ?

The biggest problem I have is the volume pot : on the clapton's circuits, it is a 50k, but uselly we use a 250K isn't it ? What should I do ?

I know it's a lot of questions, but please help me :)
Thank's !


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Post subject: Re: Is my wiring correct ? (Clapton mid boost with MODS)
Posted: Thu Apr 14, 2011 1:31 pm
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Pietchou wrote:
Hi, I bought the eric clapton mid boost and I want to put it in my american standard.
But I don't want the TBX tone control, I prefer a master tone with a (no-load), and I've tried to put some switches to cut off the mid boost when I want and go back ton a passive guitar. I think that I'm obliged to put 2 switches and one On/Off.

Have a look at the schematic I made :

http://www.hostingpics.net/viewer.php?i ... fie769.jpg

Do you think it's correct ?
Can I do something to reduce the number of the switches ? And which type of switches should I use ?

The biggest problem I have is the volume pot : on the clapton's circuits, it is a 50k, but uselly we use a 250K isn't it ? What should I do ?

I know it's a lot of questions, but please help me :)
Thank's !


You could substitute a "normal" tone pot for the TBX with no problem.

Admittedly, I never delved into the inner workings of the Clapton circuit. However, it is my understanding that it must be energized (via the battery) in order for the entire circuit it is integrated with to work.

As to turning a 50K pot to a 250K pot, a resistor load of 200K ohms would have to be placed in line in lieu of what you have as the green lead coming off your upper switch for the passive mode.

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Post subject: Re: Is my wiring correct ? (Clapton mid boost with MODS)
Posted: Thu Apr 14, 2011 2:02 pm
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Martian wrote:
You could substitute a "normal" tone pot for the TBX with no problem.


First goal reached


Martian wrote:
Admittedly, I never delved into the inner workings of the Clapton circuit. However, it is my understanding that it must be energized (via the battery) in order for the entire circuit it is integrated with to work.


I have to check, but i'm also pretty sur that if we disconnect the battery, we can't play with an amplifier. But I want to find a way to have "2" guitar circuit : one active and another passive.

Martian wrote:
a resistor load of 200K ohms would have to be placed in line in lieu of what you have as the green lead coming off your upper switch for the passive mode


i'm sorry, I'm french, I didn't understand where should I put it :s ... One the volume pot connecter to green wire and ground, or green wire and the output of the volume pot ?

Are you sure it work, because the resistance of a true 250K pot goes from 0 ohm to 250K ohm, and I have the impression than what you propose to me is a pot who goes from 200K ohm to 250K ohm... I'm not going to hear anything, the volume in the output will be too low isn't it ?


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Post subject: Re: Is my wiring correct ? (Clapton mid boost with MODS)
Posted: Thu Apr 14, 2011 3:57 pm
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Pietchou wrote:
...
I'm sorry, I'm french, I didn't understand where I should I put it :s ... One the volume pot connector to green wire and ground, or green wire and the output of the volume pot ?


Your English is excellent, there is no need to apologize.

Per your diagram, the 200K resistor would replace the green wire from Switch 1 to the input of the volume pot.

Pietchou wrote:
...Are you sure it work, because the resistance of a true 250K pot goes from 0 ohm to 250K ohm, and I have the impression than what you propose to me is a pot who goes from 200K ohm to 250K ohm... I'm not going to hear anything, the volume in the output will be too low isn't it ?


Yes. A true 250K ohm pot turned all the way up to '10' has a resistance of 250K ohms, not 0 ohms. You may be confusing a regular pot with a "no-load" pot. In either case, the ohms of the pot increases as you dial the pot down from '10'.

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Post subject: Re: Is my wiring correct ? (Clapton mid boost with MODS)
Posted: Fri Apr 15, 2011 2:32 am
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Ok, thanks a lot, I will make another schematic to be sure, and if someone is interested, it would help.

Martian wrote:
Yes. A true 250K ohm pot turned all the way up to '10' has a resistance of 250K ohms, not 0 ohms. You may be confusing a regular pot with a "no-load" pot. In either case, the ohms of the pot increases as you dial the pot down from '10'.


Ahhhhhh, I think I've missed something in school : just for sum up :

VOLUME POTS :
- 0 -> R = usely 0 ohm, but it will be 200K ohm here
- 10 -> R = 200+50 = 250K ohm

So that's mean that when the resistance increas, the volume increas too !?

TONE POTS :
- 0 -> R = 0 ohm
- 10 -> R = 250K ohms
And there I don't understand : because a no-load tone pots should have no resistance at all at position "10" !?

EDIT :

here my new schematic : http://www.hostingpics.net/viewer.php?i ... ie7692.jpg

I've put the 200K resistance and I've change the 0,047uF cap of the tone pot to a 0,022uF, like on all of fender's stratocasters...

I still don't uderstand why I'm going to have a "full" sound with the passive circuit and my volume pot at 10... :s

thank


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Post subject: Re: Is my wiring correct ? (Clapton mid boost with MODS)
Posted: Fri Apr 15, 2011 7:05 am
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Pietchou wrote:
Ok, thanks a lot, I will make another schematic to be sure, and if someone is interested, it would help.

Martian wrote:
Yes. A true 250K ohm pot turned all the way up to '10' has a resistance of 250K ohms, not 0 ohms. You may be confusing a regular pot with a "no-load" pot. In either case, the ohms of the pot increases as you dial the pot down from '10'.


Ahhhhhh, I think I've missed something in school : just for sum up :

VOLUME POTS :
- 0 -> R = usely 0 ohm, but it will be 200K ohm here
- 10 -> R = 200+50 = 250K ohm

So that's mean that when the resistance increas, the volume increas too !?

TONE POTS :
- 0 -> R = 0 ohm
- 10 -> R = 250K ohms
And there I don't understand : because a no-load tone pots should have no resistance at all at position "10" !?

EDIT :

here my new schematic : http://www.hostingpics.net/viewer.php?i ... ie7692.jpg

I've put the 200K resistance and I've change the 0,047uF cap of the tone pot to a 0,022uF, like on all of fender's stratocasters...

I still don't uderstand why I'm going to have a "full" sound with the passive circuit and my volume pot at 10... :s

thank


A "no load" pot has 0 resistance on '10' because the resistance path of the pot has been removed, in effect, taking the pot out of the circuit. If a 'normal' pot is used, this is not the case. The value of the 'normal' pot on '10' is what it is. For example, a 'normal' 250K ohms pot has a resistance (ideally) of 250K ohms on '10'.

When the pot's resistance is increased, the frequency response of the load (as applicable) increases which may be perceived as a slight increase in volume.

In your context, the "full" sound you will experience shall be to the extent of the pots' resistance in the circuit with all pots on '10'.

Your diagram now looks correct. However and like I said previously, I'm not sure the Clapton circuit will allow the rest of the circuit to function unless the Clapton circuit is energized.

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Post subject: Re: Is my wiring correct ? (Clapton mid boost with MODS)
Posted: Fri Apr 15, 2011 7:24 am
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Martian wrote:
A "no load" pot has 0 resistance on '10' because the resistance path of the pot has been removed, in effect, taking the pot out of the circuit. If a 'normal' pot is used, this is not the case. The value of the 'normal' pot on '10' is what it is. For example, a 'normal' 250K ohms pot has a resistance (ideally) of 250K ohms on '10'.


Ok thank. that's mean that my volume control will goes from "medium" sound at 1 to "full" sound at 10 ?

I still can't imagine how a higher resitance will give us more sound xD, but don't worry, I accept it...


Martian wrote:
However and like I said previously, I'm not sure the Clapton circuit will allow the rest of the circuit to function unless the Clapton circuit is energized


So you think that when all my switch will be up (passive circuit without the battery), the clapton mid boost will creat some problem and enable my volume an my tone to works correctly ??


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Post subject: Re: Is my wiring correct ? (Clapton mid boost with MODS)
Posted: Fri Apr 15, 2011 8:21 am
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Pietchou wrote:
Ok thank. that's mean that my volume control will goes from "medium" sound at 1 to "full" sound at 10?


You're welcome.

No. It means that your volume control will go from NO sound on '1' to "full" sound at '10' WITH whatever resistance the pot is impressing on it.

Pietchou wrote:
I still can't imagine how a higher resitance will give us more sound xD, but don't worry, I accept it...


I didn't invent the laws of physics, I just follow them.

Pietchou wrote:
So you think that when all my switch will be up (passive circuit without the battery), the clapton mid boost will creat some problem and enable my volume an my tone to works correctly ??


Once again, I could be wrong but it is my understanding that the Clapton circuit must be activated at all times for the rest of the guitar's circuit to work.

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Post subject: Re: Is my wiring correct ? (Clapton mid boost with MODS)
Posted: Fri Apr 15, 2011 8:33 am
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Martian wrote:
No. It means that your volume control will go from NO sound on '1' to "full" sound at '10' WITH whatever resistance the pot is impressing on it.


So what the point of putting a resistance, or a 50k pot, or a 250k ? What's the difference ?


Martian wrote:
Once again, I could be wrong but it is my understanding that the Clapton circuit must be activated at all times for the rest of the guitar's circuit to work.


Sure ! I asked a friend who have the clapton artist series strat, and he told me that if we remove the battery, we have NO sound ! And that why I install those 3 switches to "bypassed" the Clapton mid boost...


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Post subject: Re: Is my wiring correct ? (Clapton mid boost with MODS)
Posted: Fri Apr 15, 2011 10:38 am
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Pietchou wrote:
So what the point of putting a resistance, or a 50k pot, or a 250k ? What's the difference ?


There are certain accepted parameters in guitar circuits. For example, a low impedance (active) circuit will typically use a 25K or a 50K pot where as you can see, even the impedance of the pot is low. Conversely, in a high impedance (passive) guitar circuit, a 250K to 500K pot is the accepted standard. In a direct answer to your question, a 50K pot in a high impedance circuit will compress the frequency response and the sweep of the pot will be erratic. Conversely, a 250K pot in a low impedance circuit will cause it to squeal uncontrollably.

Pietchou wrote:
Sure ! I asked a friend who have the clapton artist series strat, and he told me that if we remove the battery, we have NO sound ! And that why I install those 3 switches to "bypassed" the Clapton mid boost...


All that's left to be said is, wire it up and see what happens.

Best wishes.

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Post subject: Re: Is my wiring correct ? (Clapton mid boost with MODS)
Posted: Fri Apr 15, 2011 10:50 am
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Martian wrote:
50K pot in a high impedance circuit will compress the frequency response and the sweep of the pot will be erratic


And you think that the 200K resistance will decrease this effect isn't it ?

Martian wrote:
All that's left to be said is, wire it up and see what happens.


That's I going to do.

Just, for the battery, do you think that I will have enough space by locking the tremolo ? I really don't want to make a rout or to put the battery under the pickgard if I'll have to change it a lot...

Thank's a lot


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Post subject: Re: Is my wiring correct ? (Clapton mid boost with MODS)
Posted: Fri Apr 15, 2011 11:24 am
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Pietchou wrote:
And you think that the 200K resistance will decrease this effect isn't it ?


Yes, it will 'normalize' it by making it ohm compatible while in passive mode.

Pietchou wrote:
Just, for the battery, do you think that I will have enough space by locking the tremolo ? I really don't want to make a rout or to put the battery under the pickgard if I'll have to change it a lot...


Consider too, the Clapton circuit and the switches will take up a lot of room underneath the pickguard. The battery MAY still fit underneath the pickguard beneath the tone pot or POSSIBLY if you place the battery sideways between the pickup selector switch and the volume pot. Again, it depends on where you place the rest of your components. In any situation, you'd have to wrap the battery in electrical tape so to insulate its casing where it cannot short out against any of the other components' positive terminals. Or, and I think this would be best: Once the tremolo is blocked, you can remove 2 or 3 springs and place the battery in the path where those springs were. Here you wouldn't even have to tape it.

Pietchou wrote:
Thank's a lot


You're quite welcome.

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Post subject: Re: Is my wiring correct ? (Clapton mid boost with MODS)
Posted: Fri Apr 15, 2011 12:13 pm
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Martian wrote:
Or, and I think this would be best: Once the tremolo is blocked, you can remove 2 or 3 springs and place the battery in the path where those springs were


I agree, it's the best, I make the battery more accessible. I hope it won't make my tremolo too soft...


Anyway, thanks a lot for your help, and if someone has other idees, I would be very happy :)

I'll tell you if it works ;)


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