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 Forum index » DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson
Tempco's?
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Sprak



Joined: Oct 19, 2005
Posts: 15
Location: Stockholm, Sweden

PostPosted: Sun Nov 20, 2005 5:12 pm    Post subject: Tempco's? Reply with quote  Mark this post and the followings unread

Hi everybody. Been reading this forum for some time now and I must say that for a DIY newbie like myself it's been a great learning asset, especially with the amazingly friendly tone and helpfulness.

So, like many others, i'm building a Soundlab, starting tomorrow, after finishing my WSG earlier today (based on Lorenzo's very helpful pcb design which also got me to learn how to etch pcb's). I'm planning from the outset to make it playable via a CV keyboard once I've finished the basic Soundlab. And reading up on the tips Ray wrote regarding getting the thing to be in tune as good as possible, I'm wondering: how much does using tempco's matter? Because this is one of the few parts I can't be able to find in my part of the world (Sweden). However, I wouldn't hesitate ordering them from abroad if it's definitely recommended.
(However, if someone in Sweden happen to know of a good place to find them, send me a pm!)

Thanks in advance for any help in this matter! And thanks everyone for the most interesting and nice forum I've ever come across on the internet!
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Pehr



Joined: Aug 14, 2005
Posts: 1307
Location: Björkvik, Sweden
Audio files: 2

PostPosted: Mon Nov 21, 2005 4:09 am    Post subject: Re: Tempco's? Reply with quote  Mark this post and the followings unread

I've had trouble finding them too. The 2k ones are only available from Rays site... Crying or Very sad

I think they're good if you don't want to tune the SL (to 1V/Oct) before each time you play it... if the temperature has changed since the last time you played it. But I'm not sure... Confused

Am I right? Rolling Eyes

From the ASM-1-site:
Quote:
Temprature compensating resistors can be used in the positions shown. If you know about these, you can put them in. If you don't, just use normal metal film resistors.

All of the critical exponential converter components are physically placed next to each other so that they can be in physical contact. The transistors and the tempco resistors (if used) should be gooped up with heatsink compound (an insidious white paste) and tie-wrapped together, for best thermal result. This is totally optional and only for those who are after perfect performance. The result will be almost negigible so no big deal if you don't do it.
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gubbeper



Joined: Oct 10, 2005
Posts: 50
Location: Sweden

PostPosted: Mon Nov 21, 2005 5:19 am    Post subject: Reply with quote  Mark this post and the followings unread

I have nothing to ad to this thread except I just thought it would be cool with three Swedes in the same topic! Very Happy

OK, stupid idea… Embarassed

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Uncle Krunkus
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Joined: Jul 11, 2005
Posts: 4760
Location: Sydney, Australia
Audio files: 52
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PostPosted: Mon Nov 21, 2005 5:21 am    Post subject: Reply with quote  Mark this post and the followings unread

There are other ways of improving tracking which are a lot less of a pain. So I'm doing all of those first. If, after I've got my CV/Gate keyboard finished I find that it only stays in tune for 2 octaves then I might think about it. But hey, every other instrument I own stays in tune too well!! So I'm just as likely to fall in love with this uncontrolled feature of DIY synths!!
PS I sometimes detune tracks by up to 10cents just for the hell of it anyway!! Laughing
PPS I must be the turnip! Laughing

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Pehr



Joined: Aug 14, 2005
Posts: 1307
Location: Björkvik, Sweden
Audio files: 2

PostPosted: Mon Nov 21, 2005 8:18 am    Post subject: Reply with quote  Mark this post and the followings unread

gubbeper wrote:
I have nothing to ad to this thread except I just thought it would be cool with three Swedes in the same topic! Very Happy


I wonder how many SLs there are in sweden... Rolling Eyes

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paul



Joined: Feb 22, 2005
Posts: 31
Location: Italy

PostPosted: Tue Nov 29, 2005 3:40 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi Crew,
try to contact:
Heko Elektronikk AS
P.O. Box 12 Stromsdalen
2005 Raelingen, Norway
Tel: +47 64 80 27 70 - Fax: +47 64 80 27 89
www.heko.no
mail@heko.no

Maybe they can have the PT146

...sorry, I'm not from Sweden Laughing

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