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 Forum index » DIY Hardware and Software » fonik's place
PCB OFFER: Single Channel Attenuverter PCB
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fonik



Joined: Jun 07, 2006
Posts: 3760
Location: Germany
Audio files: 23

PostPosted: Sat Sep 29, 2012 7:35 am    Post subject: Reply with quote  Mark this post and the followings unread

@numbertalk
@kitsch-bent

i put you on a waiting list. if noone withdraws his pre-order i will re-order the quantities you need. no problem.

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matthias
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numbertalk



Joined: May 05, 2008
Posts: 980
Location: Austin, TX
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PostPosted: Sat Sep 29, 2012 8:46 am    Post subject: Reply with quote  Mark this post and the followings unread

Thanks!!
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ashleym



Joined: Aug 20, 2009
Posts: 181
Location: uk

PostPosted: Tue Oct 02, 2012 10:52 am    Post subject: Reply with quote  Mark this post and the followings unread

Looks like these beauties will be on their way soon.

One question/idea. Does any one know of a suitable pot for this project but with a centre dent? Ideally one with a 6mm shaft as that fits the knobs I am using. I am UK based but Mouser etc have UK distribution. I have seen pots for guitars with the correct value and a centre dent but I would like to look at alternatives.

Centre dent just makes sense for the design.

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fonik



Joined: Jun 07, 2006
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Location: Germany
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PostPosted: Tue Oct 02, 2012 1:37 pm    Post subject: Reply with quote  Mark this post and the followings unread

ashleym wrote:
Centre dent just makes sense for the design.

depends. in the past i tried several pots with center detent, and they all had two problems more or less:

1st, you will loose a bit of the fine control around the center detent, just because you have to move the pot 'over the brim' (i don't know how to describe that in english). what i mean: you have to move the potentiometer a little bit in order to make it stay where it is and not to move back into the detent. alas, you need linear pots (actually, read below), and thus you will be very interested in the area near the center for control voltages.

2nd, anytime the potentiometer goes back to the center detent the resistance is slightly different.

actually we needed a center taped potentiometer with detent, which has a log response CW from center, and an antilog response CCW from center. this could only be a custom potentiometer with a MOQ of 10.000pcs.

however, YMMV Cool

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ashleym



Joined: Aug 20, 2009
Posts: 181
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PostPosted: Tue Oct 02, 2012 1:59 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thanks for those tips. I understand exactly what you are saying, I couldnt have put it better either. Even all the Fonik-fans couldnt raise an order for 10,000 pieces.... Sad

I will try a could and see what results I get

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ashleym



Joined: Aug 20, 2009
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PostPosted: Tue Oct 09, 2012 10:27 am    Post subject: Reply with quote  Mark this post and the followings unread

ashleym wrote:

I will try a could and see what results I get


I will try a couple and see.....

The Attenuverter boards arrived today in London. Thank you very much. They are tiny, I didnt think I had all the boards I asked for when I looked at the envelope!! The size means they will fit anywhere.

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Danno Gee Ray



Joined: Sep 25, 2005
Posts: 1343
Location: Telford, PA USA

PostPosted: Tue Oct 09, 2012 2:18 pm    Post subject: Reply with quote  Mark this post and the followings unread

Got the PCBs today. Thanks
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keithwin



Joined: Jul 20, 2007
Posts: 83
Location: uk

PostPosted: Tue Oct 23, 2012 1:18 am    Post subject: Reply with quote  Mark this post and the followings unread

Late as usual, any of these left?
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fonik



Joined: Jun 07, 2006
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PostPosted: Tue Oct 23, 2012 3:31 am    Post subject: Reply with quote  Mark this post and the followings unread

i will re-order soon (together with the TH LFO). how many?
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dave_3283



Joined: Jan 30, 2009
Posts: 28
Location: Dallas TX

PostPosted: Tue Oct 23, 2012 11:03 am    Post subject: Reply with quote  Mark this post and the followings unread

10, please.
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keithwin



Joined: Jul 20, 2007
Posts: 83
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PostPosted: Wed Oct 24, 2012 4:01 am    Post subject: Reply with quote  Mark this post and the followings unread

25 please Smile
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marvkaye



Joined: Mar 14, 2011
Posts: 225
Location: Fla

PostPosted: Wed Oct 24, 2012 9:47 am    Post subject: Reply with quote  Mark this post and the followings unread

Put me down for 10 (to ship with my other stuff, of course)... thanx

<marv>
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kkissinger



Joined: Mar 28, 2006
Posts: 1221
Location: Kansas City, Mo USA
Audio files: 29

PostPosted: Mon Nov 05, 2012 2:40 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hi! Last weekend, I installed an attenuverter on a new module and it works perfectly! Look forward to adding it to some of my existing modules.

Thanks!

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fonik



Joined: Jun 07, 2006
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PostPosted: Mon Nov 05, 2012 2:48 pm    Post subject: Reply with quote  Mark this post and the followings unread

hey kevin. i am glad you liked it.

what ype of potentiometer do you use?

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kkissinger



Joined: Mar 28, 2006
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PostPosted: Mon Nov 05, 2012 3:05 pm    Post subject: Reply with quote  Mark this post and the followings unread

fonik wrote:
hey kevin. i am glad you liked it.

what ype of potentiometer do you use?


I used a 100K linear pot and a 100K trimpot. All the other values are as you specified on the schematic (all 1% resistors).

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fonik



Joined: Jun 07, 2006
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Location: Germany
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PostPosted: Mon Nov 05, 2012 3:12 pm    Post subject: Reply with quote  Mark this post and the followings unread

Embarassed
i meant what brand of potentiometer... 16 alpha, 9mm burnes...

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kkissinger



Joined: Mar 28, 2006
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PostPosted: Mon Nov 05, 2012 3:17 pm    Post subject: Reply with quote  Mark this post and the followings unread

fonik wrote:
Embarassed
i meant what brand of potentiometer... 16 alpha, 9mm burnes...


I used an Alpha -- I'll have to get the part number to you when I get back home.

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prscrptn



Joined: Oct 21, 2008
Posts: 30
Location: Chicago,IL

PostPosted: Tue Nov 27, 2012 12:40 pm    Post subject: Reply with quote  Mark this post and the followings unread

... any spares available???
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ke10g



Joined: Dec 04, 2012
Posts: 1
Location: montreal

PostPosted: Tue Dec 04, 2012 4:03 pm    Post subject: Reply with quote  Mark this post and the followings unread

I want some too please, if there are any left. 10 or so would be fine.
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henrikgo



Joined: Jul 05, 2008
Posts: 40
Location: sweden

PostPosted: Wed Dec 05, 2012 1:52 pm    Post subject: Reply with quote  Mark this post and the followings unread

I'll take 10 if there's any left or you'll do a new run.
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fonik



Joined: Jun 07, 2006
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PostPosted: Fri Dec 07, 2012 3:17 am    Post subject: Reply with quote  Mark this post and the followings unread

all check PM regarding payment and orders, please...
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numbertalk



Joined: May 05, 2008
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Location: Austin, TX
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PostPosted: Tue Dec 11, 2012 12:26 pm    Post subject: Reply with quote  Mark this post and the followings unread

Sorry for being delinquent - payment sent. Thanks!
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keithwin



Joined: Jul 20, 2007
Posts: 83
Location: uk

PostPosted: Thu Dec 13, 2012 4:45 pm    Post subject: Reply with quote  Mark this post and the followings unread

Chick lets arrived yesterday,

Great stuff
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Uncle Krunkus
Moderator


Joined: Jul 11, 2005
Posts: 4760
Location: Sydney, Australia
Audio files: 52
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PostPosted: Thu Dec 13, 2012 5:54 pm    Post subject: Reply with quote  Mark this post and the followings unread

fonik wrote:
alas, you need linear pots (actually, read below), and thus you will be very interested in the area near the center for control voltages.


Couldn't you add a 1M fixed from the wiper to each end of the pot, thus putting a 'hump' in it's response? Or are we looking at the reverse effect here? Just an idea.

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Paradigm X



Joined: Feb 15, 2011
Posts: 286
Location: Null and void

PostPosted: Sat Dec 15, 2012 4:46 pm    Post subject: Reply with quote  Mark this post and the followings unread

Im sorry if this is a basic question but can you put audio signals thru this to flip the phase?

Embarassed

Thanks Smile
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