Vintage Synth Repair

Hi guys,

Just thought I'd ask for some advice. I'm a DIY guitarist by trade so to speak and got some Yamaha electone parts including  a volume pedal but just wondered if anybody could give me any pionters on voltage requirements and how to adapt it for guitar/keyboard use.

Also I have some spare parts  ie keyboards and leslie units if any body is interested

Cheers

Aus

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Scott thanks for the quick response.

Slight problem, the volume pedal in question is not a pot based one it seems to be more of a electro mechanical/inductor type one see pic.

So not as simple aslo if I can get it to do 100k could use it to control a wah or 500k and I can control a PWM pedal

Anymore input would be much appreciated

Aus
> 
> From: scott frye <painintheamp@...>
> Date: 2008/02/23 Sat PM 09:36:38 GMT
> To: vintagesynthrepair@yahoogroups.com
> Subject: Re: [vintagesynthrepair] How does the Volume pedal work
> 
> Hi Aus,
> 
> being a tech ( by trade ) and a guitar/bass/keyboard player ( as a secret identity)
> 
> I can say that , depending on the K ohm value of the electone volume pedal ( I also have one of the same), you can use it like a volume control on a guitar .
> The value would need to be 250K to 500K if used like that.
> 
> Use one side of the pot as signal in ...the wiper as the signal out and the other side of the pot at ground potential.
> 
>  If it's a smaller K ohm value, you'd have to put an op-amp circuit around it.
> There's plenty of circuits online for that.
> 
> Go for it
> 
> austin-kelly@... wrote:                               Hi guys,
>  
>  Just thought I'd ask for some advice. I'm a DIY guitarist by trade so to speak and got some Yamaha electone parts including  a volume pedal but just wondered if anybody could give me any pionters on voltage requirements and how to adapt it for guitar/keyboard use.
>  
>  Also I have some spare parts  ie keyboards and leslie units if any body is interested
>  
>  Cheers
>  
>  Aus
>  
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>                                
> 
> 
>   Scott  Frye
> AudioFixation
> Consumer / Pro Audio Repair
> Southern VT 
> 
>   
> 
> 
> 
>        
> ---------------------------------
> Never miss a thing.   Make Yahoo your homepage.
> 

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Looks just like a Morley. We used to use one back in the 80's for 
guitar. It wouldn't load down the input of an Ampeg SJT so the axxe, a 
Gibson SG, always had great bite and sustain as the volume faded out 
from a solo. The bulb would blow or the optical sensor would get flaky. 
Otherwise it worked great for leads and then back to rhythm.

--- In vintagesynthrepair@yahoogroups.com, timothy kosiorek 
<tkosiorek@...> wrote:
>
> 
> This looks like an optical volume pedal where a usually 8-12 volt 
lamp shines through a slot that has a varying width that changes as the 
volume pedal is moved,this varies the amount of light that falls on a 
LDR or "light dependant resistor" changing the resistance of the LDR 
and varying the volume ,this pedal looks like it might have 2 channels 
since the lamp is in the middle in the white plastic lamp socket and 
the LDR boards are on the sides of the unit,these are the quietest type 
of volume controls since there is no scratching noise like with a 
potentiometer,they are used in a number of organs.

> Regards,
> Tim K.
>

Tim thats great info mate. Just need to wire it up and find out the resistance of it. Is there any easy ways to change the resistance of this ie quick component swap or is it more complicated?

Aus
> 
> From: timothy kosiorek <tkosiorek@...>
> Date: 2008/02/25 Mon PM 10:19:12 GMT
> To: <vintagesynthrepair@yahoogroups.com>
> Subject: RE: [vintagesynthrepair] How does the Volume pedal work
> 
> 
> This looks like an optical volume pedal where a usually 8-12 volt lamp shines through a slot that has a varying width that changes as the volume pedal is moved,this varies the amount of light that falls on a LDR or "light dependant resistor" changing the resistance of the LDR and varying the volume ,this pedal looks like it might have 2 channels since the lamp is in the middle in the white plastic lamp socket and the LDR boards are on the sides of the unit,these are the quietest type of volume controls since there is no scratching noise like with a potentiometer,they are used in a number of organs.
> Regards,
> Tim K.
> 
> 

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Wondering if anyone might have ideas on this:

A Drumtraks I've inherited works fine [all sounds trigger, etc] except there is no kick drum. I've tried triggering with midi as well as the pads and re-seated the eeprom but no dice. Of course all the other sounds use a different size eeprom so I can't swap eeproms to see whether that is the cause. 

anyone run into something similar or have a schematic they might want to share?

many thanks
steve