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 Forum index » Instruments and Equipment » Strings and things
Peizo+Condenser preamp
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Inventor
Stream Operator


Joined: Oct 13, 2007
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Location: San Antonio, Tx, USA
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PostPosted: Sun May 20, 2012 3:36 pm    Post subject: Reply with quote  Mark this post and the followings unread

Cool Uncle, how about some photos and sound clips of these harps?

Les

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Uncle Krunkus
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Joined: Jul 11, 2005
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PostPosted: Sun May 20, 2012 5:00 pm    Post subject: Reply with quote  Mark this post and the followings unread

Yeah, sorry bout that.
I've been meaning to take some photos of stuff for a while.
I'll try to get onto it this week. Laughing

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Danno Gee Ray



Joined: Sep 25, 2005
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Location: Telford, PA USA

PostPosted: Sun May 20, 2012 6:44 pm    Post subject: Reply with quote  Mark this post and the followings unread

how about a set of updated schematics?
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Uncle Krunkus
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PostPosted: Mon May 21, 2012 1:00 am    Post subject: Reply with quote  Mark this post and the followings unread

Yes, they need to happen soon too.
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Uncle Krunkus
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PostPosted: Mon May 21, 2012 3:14 am    Post subject: Reply with quote  Mark this post and the followings unread

Here is the latest stripboard layout.
Schem coming soon.


Piezo + Condenser Pre-amp 21-5-12.JPG
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Piezo + Condenser Pre-amp 21-5-12.JPG



Piezo + Condenser Pre-amp CS 21-5-12.JPG
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Uncle Krunkus
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PostPosted: Mon May 21, 2012 3:29 am    Post subject: Reply with quote  Mark this post and the followings unread

Sorry I haven't got any decent image software installed yet.
Here's the schem.


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Uncle Krunkus
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PostPosted: Mon May 21, 2012 3:34 am    Post subject: Reply with quote  Mark this post and the followings unread

I have found that the 500KLog volume pot only has about 20-30 degrees of functional travel. I'm not sure how to do the calculations for the pot ratios. Blend is working quite well, with a slight dip in the centre.
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Stream Operator


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PostPosted: Fri May 25, 2012 10:38 pm    Post subject: Reply with quote  Mark this post and the followings unread

I'd try a linear pot there, Uncle. I've not worked with log pots, but I believe they would have a lower practical range.

Les

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