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 Forum index » DIY Hardware and Software » YuSynth
Steiner Parker Filter - BOM and schematic don´t match
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El Mop



Joined: Aug 20, 2012
Posts: 56
Location: Germany

PostPosted: Tue Jun 30, 2015 6:47 am    Post subject: Steiner Parker Filter - BOM and schematic don´t match Reply with quote  Mark this post and the followings unread

Hi,
I recently found a mismatch between the BOM and the schematics of the Steiner Parker Filter.
The BOM gives me a value of 8.2k for R18.
The schematic shows a value of 3.9k for R18.
Which one is the right?
Thank you.
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gdavis



Joined: Feb 27, 2013
Posts: 185
Location: San Diego

PostPosted: Tue Jun 30, 2015 10:51 am    Post subject: Reply with quote  Mark this post and the followings unread

As it says in the schematic, you can vary the value of R18 to adjust the resonance range. So neither one is "right", it's a matter of preference. There's another thread about this a little ways down, apparently he ended up with 30k. http://electro-music.com/forum/topic-63631.html
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El Mop



Joined: Aug 20, 2012
Posts: 56
Location: Germany

PostPosted: Tue Jun 30, 2015 11:57 am    Post subject: Reply with quote  Mark this post and the followings unread

Thanks for the reply at first.
I know what the schematic says, but since it should be the same circuit as used in the Minibrute, I thought their must be a definte value for this.
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gdavis



Joined: Feb 27, 2013
Posts: 185
Location: San Diego

PostPosted: Tue Jun 30, 2015 9:26 pm    Post subject: Reply with quote  Mark this post and the followings unread

Oh, you want to match the MiniBrute, why didn't you say so Wink You can find the actual MiniBrute schematics here: http://hackabrute.yusynth.net/index_en.php?&arg=1

But even the MiniBrute has some "adjustable" resistors. For the VCF resonance, R18 in the Yusynth circuit seems to have been replaced by a 50k trimmer. Maybe Yves can provide some insight to how it's adjusted on the MiniBrute?

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