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#360570 - 02/06/13 10:11 AM Volume pedal
Bert Aarts Offline
Member

Registered: 01/21/02
Posts: 158
Loc: Breda, The Netherlands
I found a volume pedal for sale on the internet. The type is PVP12 , brand Proel. I did some research and found that it has a 100kOhm potentiometer in it. Can this be used as expression pedal fot KN7000?
If not, what should be the value of the potentiometer?
May be I can modify?
Bert

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#360584 - 02/06/13 11:49 AM Re: Volume pedal [Re: Bert Aarts]
Bert Aarts Offline
Member

Registered: 01/21/02
Posts: 158
Loc: Breda, The Netherlands
I did some further research on the internet and found that the PVP12 originally is ment for guitar. It has input and output and must therefor be connected between source and amplifier.
I wonder if this can be used with KN7000 because there is only one connection for the expression pedal. I think that every expression pedal only consist of a potentiometer which can be changed to meet the requiredvalue. Maybe I am wrong.
Is there any expert on the forum that can tell me about the electrical diagram of the original Technics expression model?
Hope to get the answer soon because I have a reservation at seller up till tomorrow.
Bert

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#360590 - 02/06/13 12:59 PM Re: Volume pedal [Re: Bert Aarts]
Bert Aarts Offline
Member

Registered: 01/21/02
Posts: 158
Loc: Breda, The Netherlands
PVP has two mono output jacks so besides the valuu of the potentiometer also this must be modified into one stereo jack?
Bert

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#360607 - 02/06/13 04:26 PM Re: Volume pedal [Re: Bert Aarts]
Bill Norrie Offline
Senior Member

Registered: 01/16/02
Posts: 2309
Loc: North Yorkshire
Hi Bert,
The Technics Volume Pedal uses a nominal 20K Ohm potentiometer.

The extremities of the pot. are connected between the Tip and Sleeve of a 1/4 inch Stereo jack plug, and the Slider of the pot. is connected to the Ring (Middle) connector of the jack plug.

The Tip and Sleeve connections should be arranged in such a way that when the pedal is fully depressed, the resistance between the Ring and Sleeve of the jack plug is minimum. See the attached diagram......


Attachments
Technics Swell Pedal.jpg



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#360626 - 02/07/13 01:58 AM Re: Volume pedal [Re: Bert Aarts]
Bert Aarts Offline
Member

Registered: 01/21/02
Posts: 158
Loc: Breda, The Netherlands
Thanks a lot Bill, this is exactly the information I need. I can buy the PVP12 for only 10,- so it is worth trying to modify. Maybe it even is not necessary to modify the pot, only the connection. I will let you know the results.
Bert

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#360628 - 02/07/13 02:36 AM Re: Volume pedal [Re: Bert Aarts]
Bill Norrie Offline
Senior Member

Registered: 01/16/02
Posts: 2309
Loc: North Yorkshire
OK Bert,
If you don't change the 100 KOhm Potentiometer, you may find that the Volume change only takes place toward the end of the pedal travel, rather than a smooth transition over the entire travel of the pedal.......

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#360630 - 02/07/13 03:04 AM Re: Volume pedal [Re: Bert Aarts]
Bert Aarts Offline
Member

Registered: 01/21/02
Posts: 158
Loc: Breda, The Netherlands
I understand Bill.
The original potentiometer is 200kOhm and depending on input impedance of KN7 this may cause non-linearity.I will check after receival of the pedal.
Bert

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#360858 - 02/09/13 06:59 AM Re: Volume pedal [Re: Bert Aarts]
Bert Aarts Offline
Member

Registered: 01/21/02
Posts: 158
Loc: Breda, The Netherlands
I bought the PVP12 pedal and made a cable with stereo jack plug for KN side and two mono jack plugs for pedal side. This works fine exept that volume decreases when pedal is depressed. After modifying the potmeter connections in the pedal this was solved. It is not necessary to modify the potentiometer (100kOhm, not 200kOhm as mentioned before) because the volume transition is smoothly.
Thanks for you advise Bill.
Bert

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#360865 - 02/09/13 08:20 AM Re: Volume pedal [Re: Bert Aarts]
Bert Aarts Offline
Member

Registered: 01/21/02
Posts: 158
Loc: Breda, The Netherlands
As mentioned in my previous post the volume pedal works fine but there is a small problem that I noticed. When I load a sequencer song it sometimes happens that the volume is at the level of the KN main volume . I have to press and depress the pedal one time to get it working. It depends on the sequencer song, so not all sequencer songs have this problem. I wonder whether this is caused by the pedal (100kOhm instead of 20kOhm) or by the way the song was recorded?
Any idea?
Bert


Edited by Bert Aarts (02/09/13 08:21 AM)

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#360928 - 02/10/13 03:33 AM Re: Volume pedal [Re: Bert Aarts]
Bill Norrie Offline
Senior Member

Registered: 01/16/02
Posts: 2309
Loc: North Yorkshire
Hi Bert, are you sure the Volume pedal is set to adjust 'Total Volume' ? Press Program Menus > Control > Foot Controllers > Check Expression Pedal is set to 'Total Expression' - Not 'Part Expression'........
Also, check that that the 'APC/Sequencer Volume' slider (Top Left of the KN7000 control panel) is fully upwards.

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