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Tim Escobedo MS20 filter..
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Z 6



Joined: Jun 11, 2013
Posts: 5
Location: US

PostPosted: Sat Aug 03, 2013 10:45 am    Post subject:  Tim Escobedo MS20 filter..
Subject description: what is Vr in this schematic? help, I'm a beginner!!
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I'm currently trying to play around with some different schematics to get inspiration with my friend on ideas, and I am totally new to working with circuits. My question is this.. I understand that when I see Vr, it generally indicates variable resistor, or maybe voltage regulator(?) I don't think it is either of those... I am just wondering..planning on breadboarding this maybe today, and see if it can get tweaked a bit.. And if anyone has good beginner's advice, I'm all ears.. Posted Image, might have been reduced in size. Click Image to view fullscreen.[/img]
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PHOBoS



Joined: Jan 14, 2010
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PostPosted: Sat Aug 03, 2013 1:16 pm    Post subject: Reply with quote  Mark this post and the followings unread

Vr is a fake ground created with the 100K resistor, 2 red LED's and 10uF cap (top right in the schematic). All points labeled Vr are connected to that.
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Z 6



Joined: Jun 11, 2013
Posts: 5
Location: US

PostPosted: Sat Aug 03, 2013 1:31 pm    Post subject: Reply with quote  Mark this post and the followings unread

a fake ground? thanks! that helps out big time.. Would that be a 'voltage reference'? I'll be on here asking dumb questions a while I think before I can contribute anything of use..
thank you again, PHOBoS. that's a huge help.
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PHOBoS



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PostPosted: Sat Aug 03, 2013 2:59 pm    Post subject: Reply with quote  Mark this post and the followings unread

yeah, voltage reference would be my guess to. I'm calling it fake ground but it is of course nothing more then a reference voltage.
if you're gonna experiment with it try different filter caps (currently 680pF), 2 different values can also give interesting results.

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Z 6



Joined: Jun 11, 2013
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PostPosted: Sat Aug 03, 2013 4:05 pm    Post subject: Reply with quote  Mark this post and the followings unread

awesome. Thanks again! I'll be trying that out soon here. Excited now I know what that all means.
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Z 6



Joined: Jun 11, 2013
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PostPosted: Sun Aug 11, 2013 9:35 am    Post subject: Reply with quote  Mark this post and the followings unread

made a good bit of progress on this, had to do some tweaking to get it to a decent range..maybe I'm wondering now if it's even possible to somehow convert the vr to -9v? does anyone think that could be somehow possible?
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