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Thread

What opamp to use?

2009-02-22 by Koos Fockens

Seeing the blinky LED's on Robert Rich's MOTM-800's in the demo video, made me want 
these too on my 800's, and I found the mod for this on Stooge Moe's website. Before I start 
to buy parts etc, I'd like to know which dual opamp is best suited for this? I realize almost 
anything will do, but I want to make sure I get something decent enough not to cause 
problems or interference, noise, hiss etc.  

Cheers :-)

Koos

Re: [motm] What opamp to use?

2009-02-22 by Ben Stuyts

Hi Koos,

On 22 feb 2009, at 17:42, Koos Fockens wrote:

> Seeing the blinky LED's on Robert Rich's MOTM-800's in the demo  
> video, made me want
> these too on my 800's, and I found the mod for this on Stooge Moe's  
> website. Before I start
> to buy parts etc, I'd like to know which dual opamp is best suited  
> for this? I realize almost
> anything will do, but I want to make sure I get something decent  
> enough not to cause
> problems or interference, noise, hiss etc.

The mentioned 1458 or a TL072 will do fine. Not critical at all I  
think. But have you looked at the Tellun mod here?
http://www.tellun.com/motm/diy/db800/DB-800.html
This adds some other goodies too. And a nice ready-made pcb.

Kind regards,
Ben

Re: [motm] What opamp to use?

2009-02-22 by John Mahoney

At 11:42 AM 2/22/2009, Koos Fockens wrote:
>Seeing the blinky LED's on Robert Rich's MOTM-800's in the demo 
>video, made me want
>these too on my 800's, and I found the mod for this on Stooge Moe's 
>website. Before I start
>to buy parts etc, I'd like to know which dual opamp is best suited 
>for this? I realize almost
>anything will do, but I want to make sure I get something decent 
>enough not to cause
>problems or interference, noise, hiss etc.
>
>Cheers :-)
>
>Koos

Hiya, Koos! Still spending any time in Florida? Anyway...

Others on this list are more qualified to answer, and I've got no 
idea what the circuit does, but if you just need a "generic" op amp I 
would suggest the LF442 because has low power consumption. (Ray 
Wilson uses the 442 and/or 444 in his battery-powered Sound Lab.)

John

Re: [motm] What opamp to use?

2009-02-22 by Richard Brewster

Any dual op amp will do for that circuit.  TL072 is fine.

For more MOTM-800 mods see:

http://www.tellun.com/motm/diy/db800/DB-800.html
http://pugix.com/synth/motm-800-adsr-envelope-generator/

Richard Brewster

Koos Fockens wrote:

Show quoted textHide quoted text

> Seeing the blinky LED's on Robert Rich's MOTM-800's in the demo video, made me want 
> these too on my 800's, and I found the mod for this on Stooge Moe's website. Before I start 
> to buy parts etc, I'd like to know which dual opamp is best suited for this? I realize almost 
> anything will do, but I want to make sure I get something decent enough not to cause 
> problems or interference, noise, hiss etc.  
>
> Cheers :-)
>
> Koos
>
>

I'll second the tellun DB-800 recommendation. I've got them on all 4 of my EG's. And fitting 2 leds onto the 800 panel is not only doable, but very cool looking - see pictures here - http://www.flickr.com/photos/sduck409/2951171310/

Show quoted textHide quoted text

On Sun, Feb 22, 2009 at 10:42 AM, Koos Fockens <torikoos@...> wrote:

Seeing the blinky LED's on Robert Rich's MOTM-800's in the demo video, made me want
these too on my 800's, and I found the mod for this on Stooge Moe's website. Before I start
to buy parts etc, I'd like to know which dual opamp is best suited for this? I realize almost
anything will do, but I want to make sure I get something decent enough not to cause
problems or interference, noise, hiss etc.

Cheers :-)

Koos

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Stephen Drake
sduck409@...
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