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 Forum index » DIY Hardware and Software » YuSynth
50k rev log pot, Minimoog filter.
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isak



Joined: Dec 13, 2009
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PostPosted: Sun Dec 30, 2012 4:11 am    Post subject: 50k rev log pot, Minimoog filter. Reply with quote  Mark this post and the followings unread

Hi Yves.

I can't get a hold on 50k rev log pot.
Can I use 100k Rev log Instead?
if yes what resistors I need to change and for what value?
Or maybe regular 50k log pot?

Thank in advace,
Isak E.

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yusynth



Joined: Nov 24, 2005
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Location: France

PostPosted: Sun Dec 30, 2012 11:02 am    Post subject: Reply with quote  Mark this post and the followings unread

Yes you may use a 100K rev log, it will just sound duller at min resonance but this is no problem really.
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isak



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PostPosted: Sun Dec 30, 2012 11:26 am    Post subject: Reply with quote  Mark this post and the followings unread

Thank you.

For the match pairs bc547, can I do the diode check method to match them?
Btw the bc547 is a B type? Meaning BC547B?

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yusynth



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PostPosted: Sun Dec 30, 2012 11:52 am    Post subject: Reply with quote  Mark this post and the followings unread

Yes the diode test is OK, the voltage drop should match within 2mV.
BC547B will do

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isak



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PostPosted: Sun Dec 30, 2012 11:54 am    Post subject: Reply with quote  Mark this post and the followings unread

thank you, you make it all go so easy and smooth Smile
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isak



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PostPosted: Tue Jan 01, 2013 6:29 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi Yves.

I've just read in one of the posts that your minimoog filter design need to be also Hfe matched not just Vbe, is this correct?

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yusynth



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PostPosted: Tue Jan 01, 2013 6:38 am    Post subject: Reply with quote  Mark this post and the followings unread

No no need for that. The important is Vbe match for the ladder transistors. But anyway if they also match for Hfe then it is even better.
The Hfe matching would concern the output stage which is built around a CA3046 that provides a good matching.

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isak



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PostPosted: Tue Jan 01, 2013 6:52 am    Post subject: Reply with quote  Mark this post and the followings unread

thank you.

I Mached them to be Vbe and Hfe just in case Smile
I hope Ill finish my synth and upload some pics, it's a lot of work

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