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 Forum index » DIY Hardware and Software » fonik's place
PCB offer: Thomas Henry's 555-VCO
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lucid



Joined: Dec 03, 2012
Posts: 19
Location: Slovakia, EU

PostPosted: Mon Mar 04, 2013 3:26 am    Post subject: Reply with quote  Mark this post and the followings unread

elmegil wrote:
Do you have 2 150Ks?

Idea this
thanks
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logicgate



Joined: Mar 02, 2013
Posts: 5
Location: brazil

PostPosted: Mon Mar 04, 2013 6:50 am    Post subject: Reply with quote  Mark this post and the followings unread

Hello guys!

Can I get away by using 1,87K 3500ppm tempcos for this project???

Cheers!
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Gaetano_AU



Joined: Oct 08, 2011
Posts: 48
Location: Australia

PostPosted: Tue Mar 05, 2013 3:59 am    Post subject:  Boards Arrived Matthias, nicely packed, thanks :) Reply with quote  Mark this post and the followings unread

Boards Arrived Matthias, nicely packed, thanks Smile
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fonik



Joined: Jun 07, 2006
Posts: 3721
Location: Germany
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PostPosted: Tue Mar 05, 2013 2:14 pm    Post subject: Reply with quote  Mark this post and the followings unread

logicgate wrote:
Hello guys!

Can I get away by using 1,87K 3500ppm tempcos for this project???

Cheers!

w/o doing the maths: i don't believe you will achieve the 1V/oct using the 1k87...

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matthias
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fonik



Joined: Jun 07, 2006
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PostPosted: Tue Mar 05, 2013 2:18 pm    Post subject: payment details Reply with quote  Mark this post and the followings unread

i sent out PMs/emails to all who ordered PCBs/panels. please check you PM's, i am missing the response of quite a few people.
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matthias
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LektroiD



Joined: Aug 23, 2008
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PostPosted: Wed Mar 06, 2013 5:53 am    Post subject: Reply with quote  Mark this post and the followings unread

I'm assuming the farnell pots I linked won't fit this project?

Any other sources (that are not wildly expensive)?

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fonik



Joined: Jun 07, 2006
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PostPosted: Wed Mar 06, 2013 2:11 pm    Post subject: Reply with quote  Mark this post and the followings unread

LektroiD wrote:
Banzai seem quite expensive for their pots. Would this fit?
http://uk.farnell.com/jsp/search/productdetail.jsp?id=1191742&_requestid=24555

they would fit the footprint, buuuut:
they are not high enough.
farnell offers other alps with a longer shaft, but alas, these are D-shaft, too. and D-shaft would not be cool with the LFO, since not all potentiometers are mounted with the same orientation...
BTW i built two modules with the alps (get them cheap here in germany , and with a full shaft), and they don't have enough tension IMHO. doesn't feel right to me.

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matthias
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fonik



Joined: Jun 07, 2006
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PostPosted: Wed Mar 13, 2013 2:42 am    Post subject: Re: payment details Reply with quote  Mark this post and the followings unread

fonik wrote:
i sent out PMs/emails to all who ordered PCBs/panels. please check you PM's, i am missing the response of quite a few people.


Very Happy

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matthias
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ungleichklang



Joined: Dec 03, 2011
Posts: 70
Location: East-Belgium

PostPosted: Wed Mar 13, 2013 3:02 am    Post subject: Reply with quote  Mark this post and the followings unread

sorry Mathias, my 4 boards arrived, all is fine
.....
......
btw. do I really have to use tempco's??

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fonik



Joined: Jun 07, 2006
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PostPosted: Thu Mar 14, 2013 12:54 am    Post subject: Reply with quote  Mark this post and the followings unread

the tempco's are to reduce drift due to temperature changes. this gets more important the longer the takes are you recording, and if you are interested in more precise tuning between the tracks.
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cheers,
matthias
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diablojoy



Joined: Sep 07, 2008
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PostPosted: Fri Mar 15, 2013 12:24 am    Post subject: Reply with quote  Mark this post and the followings unread

boards received in OZ all good
thanks again Matthias.

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jp1971



Joined: Mar 07, 2013
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Location: Brooklyn, NY

PostPosted: Wed Mar 20, 2013 9:55 am    Post subject: PCB offer: Thomas Henry's 555-VCO Reply with quote  Mark this post and the followings unread

Sorry for coming to this thread late. Are there any PCBs left? If so, I would like to order:

1x circuit PCB
1x eurorack PCB
1x front panel

Thanks,
jp1971
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fonik



Joined: Jun 07, 2006
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PostPosted: Thu Mar 21, 2013 8:11 am    Post subject: Reply with quote  Mark this post and the followings unread

there are quite a few open orders, and i actually wanted to keep a few spares just in case something gets lost in the mail. but i will put you on the waiting list.
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doobedy



Joined: Jan 12, 2009
Posts: 19
Location: Los Angeles

PostPosted: Fri Mar 22, 2013 12:38 pm    Post subject: Reply with quote  Mark this post and the followings unread

Man I just noticed the prototype had an LFO switch and LED. I wish those had made it to the panel as well.

Is that just a switch changing capacitor values? How is the LED done? Not that I see room on the panels to fit anything on there. I was thinking of a wave folder to go between my two VCOS, maybe I could add an LED and LFO switch to that as a custom panel.

Did TH specifically ask you not expand his circuit in any way?
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modulardoom



Joined: Mar 13, 2013
Posts: 5
Location: portugal

PostPosted: Mon Apr 01, 2013 5:04 pm    Post subject: Reply with quote  Mark this post and the followings unread

if it would be still possible i would like to order
1 circuit pcb
1 eurorack pcb
1 front panel
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Constantin



Joined: Aug 08, 2011
Posts: 2
Location: Berlin

PostPosted: Sun Apr 07, 2013 3:58 am    Post subject: Reply with quote  Mark this post and the followings unread

If there are still some pcbs available, I would be in for
4 circuit PCB

thanks
Constantin
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fonik



Joined: Jun 07, 2006
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PostPosted: Thu May 30, 2013 10:44 pm    Post subject: Reply with quote  Mark this post and the followings unread

interest in more of the PCBs/front panels?

i will gather/gain interest until 21 JUN 2013 and re-order what is needed...

for the front panels i would need to order at least 30pcs, though. the price for a single front panel would be 10.-EUR/13.-USD now.

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jackdamery



Joined: Apr 26, 2010
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PostPosted: Fri May 31, 2013 2:11 am    Post subject: Reply with quote  Mark this post and the followings unread

3 main boarde PCBs please and 4 euro pcbs
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Boerge



Joined: Sep 02, 2009
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Location: Germany

PostPosted: Fri May 31, 2013 3:08 am    Post subject: Reply with quote  Mark this post and the followings unread

I would take 1 main PCB too.

regards

Boerge

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TheAncientOne



Joined: Dec 26, 2006
Posts: 146
Location: United Kingdom

PostPosted: Fri May 31, 2013 9:06 am    Post subject: Reply with quote  Mark this post and the followings unread

fonik wrote:
LektroiD wrote:
Banzai seem quite expensive for their pots. Would this fit?
http://uk.farnell.com/jsp/search/productdetail.jsp?id=1191742&_requestid=24555

they would fit the footprint, buuuut:
they are not high enough.
farnell offers other alps with a longer shaft, but alas, these are D-shaft, too. and D-shaft would not be cool with the LFO, since not all potentiometers are mounted with the same orientation...


I know Rean do knobs for D shafts in all 4 compass points of orientation. If you've mounted the pot at an angle, you're out of luck. The Rean's are nice and slim too.
http://reanknobs.com/forums.html?id=26

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TheAncientOne



Joined: Dec 26, 2006
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PostPosted: Fri May 31, 2013 9:30 am    Post subject: Reply with quote  Mark this post and the followings unread

Oh, and I forgot: Another two are alive! A smooth build, once I found the errata notes. I used 100K trimmers for sine round, and got an easy +/-5V

One though for Fonik - could you think of leaving a larger footprint area, with perhaps multiple pinouts, (as the late Jurgen Haible did on his PCBs), for the timing caps. I have a lot of High quality 2n2 polystyrenes, (and yes - I will give batches of then out for postage), but I couldn't get them to fit. I just squeezed some 2n2 polypropylenes I had in stock into place, and I will try the COG's in future, but I think a little more flexibility in the capacitor area would be a good idea. There was plenty of PCB real-estate left. The capacitor footprint Jurgen used is no way unique or copyright, so there would be no problem in just 'lifting' it. I'm sure the man would be smiling down his approval if you did, anyway.

A minor point really. My thanks again to Thomas Henry and Fonik for a really nice VCO with a massive range., and a very easy build.

Note for other builders on transistor matching: I tested 2n3906's from a bag of 100 bought from 'Rapid' I was able to get 4 with gains identical out of 20 or so tested, and the maximum gain variation I read was +/- 10 on a nominal 230 median value. I think just using two from the same manufacturer and date code would be fine.


TH555VCO_test.jpg
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First test on 555 VCO
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TH555VCO_test.jpg



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jackdamery



Joined: Apr 26, 2010
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Location: UK

PostPosted: Fri May 31, 2013 9:32 am    Post subject: Reply with quote  Mark this post and the followings unread

TheProf, I see you're in the UK too. Where did you get your 2k 3500ppm tempcos?
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Skrog Productions



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PostPosted: Fri May 31, 2013 1:24 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hi Matthias.

2nd order interest, could i please order.

4 - Main pcb.


Thanks.

Dave

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TheAncientOne



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PostPosted: Fri May 31, 2013 2:36 pm    Post subject: Reply with quote  Mark this post and the followings unread

I got one batch from 'Magic Smoke Eectronics' and the others from Farnell, but it seems they only have the 2K ones in SMT, now. I future I will be using the SMT ones because it's easier to get a closer bond the to the transistor package. The could even be mounted inside an IC socket to get a close contact with a socketed dual pair, and to avoid the effects of drafts.
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JasonMichener



Joined: Jun 02, 2013
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Location: Seattle

PostPosted: Sun Jun 02, 2013 2:42 am    Post subject: Reply with quote  Mark this post and the followings unread

I would like:
2 x circuit
2 x euro
2 x panels

Thanks!
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