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 Forum index » DIY Hardware and Software » Thomas Henry designs
Mankato / Range Switch?
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JCM



Joined: Jul 21, 2008
Posts: 15
Location: MPLS

PostPosted: Sat Nov 15, 2008 2:50 pm    Post subject: Mankato / Range Switch? Reply with quote  Mark this post and the followings unread

Let's say someone went ahead and put a range switch on their Mankato panel and can't figure out how to wire it up. How would this person go about wiring up a range switch?!
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Tim Servo



Joined: Jul 16, 2006
Posts: 924
Location: Silicon Valley
Audio files: 11

PostPosted: Sat Nov 15, 2008 10:46 pm    Post subject: Mankato / Range Switch? Reply with quote  Mark this post and the followings unread

Hey JC,

Tim from Magic Smoke here. Well, if you wanted to add a range switch to the Mankato, you'd have to switch out all four timing caps (330pF: C4, 7, 10, 13). Depending on how different the new caps were, you might also have to change the input caps to each section (560pF: C3, 6, 9, 12). Basically, you're looking at a multi-pole rotary switch to implement this.

A better question might be "why?" The Mankato has a range of 0.016Hz (1 cycle/60 seconds) to 22kHz, so it covers an extremely wide range of low frequencies, the entire audio range, and up into ultrasonic territory. With good quality polystyrene caps and a nice clean board, you might even get a wider range than this. We mentioned possibly changing the caps in our early literature (and on our web site), but as we built them and saw the available range, we didn't really explore it any further. Essentially, the Mankato really doesn't need a range switch. Wink If you have a spare switch on the front panel, you might want to add a DC / AC coupling option to one of the audio inputs. Others here might have other suggestions, but implementing a range switch on the Mankato (or any four-pole VCF, for that matter), is a bit tricky. Shout out if this doesn't make sense.


Tim (brother, can you spare a switch) Servo
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JCM



Joined: Jul 21, 2008
Posts: 15
Location: MPLS

PostPosted: Thu Nov 20, 2008 9:05 am    Post subject: Reply with quote  Mark this post and the followings unread

Hmmm,
Thanks for the info! I guess this person will just have to deal with the tiny little hole in his Mankato panel.
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Tronato



Joined: Sep 21, 2007
Posts: 274
Location: Florida
Audio files: 2

PostPosted: Thu Nov 20, 2008 11:30 am    Post subject: Reply with quote  Mark this post and the followings unread

Hello!

If the tiny little hole is too much of a problem, why not install an On - Off switch...

Thanks!

TRON
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