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 Forum index » DIY Hardware and Software » Thomas Henry designs
The VCO-555
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fonik



Joined: Jun 07, 2006
Posts: 3760
Location: Germany
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PostPosted: Sat Sep 22, 2012 1:38 pm    Post subject: Reply with quote  Mark this post and the followings unread

so i finally got around finishing this build. it is the old prototype PCB. i left off the PMW of the front panel (it is on the board, though).
therefor i added a feature that is not part of the circuit/PCB. i added a VCO/LFO switch that switches a larger cap in parallel to the original timing cap, and connects a LED to the core saw.

will have to calibrate it still.

TH 555 VCO 01

TH 555 VCO 02

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matthias
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ungleichklang



Joined: Dec 03, 2011
Posts: 83
Location: East-Belgium

PostPosted: Sat Sep 22, 2012 1:53 pm    Post subject: Reply with quote  Mark this post and the followings unread

the build looks good ..
waiting for soundsamples Smile

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mcop



Joined: Apr 27, 2012
Posts: 32
Location: Brighton UK

PostPosted: Sat Sep 22, 2012 2:00 pm    Post subject: Reply with quote  Mark this post and the followings unread

Nice build.

Is the extra range capacitor going to be included on the final board?
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fonik



Joined: Jun 07, 2006
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PostPosted: Sat Sep 22, 2012 2:37 pm    Post subject: Reply with quote  Mark this post and the followings unread

mcop wrote:
Is the extra range capacitor going to be included on the final board?

good question, however, i would prefer to keep this a pure thomas henry design. actually i don't want to change it.

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mcop



Joined: Apr 27, 2012
Posts: 32
Location: Brighton UK

PostPosted: Sat Sep 22, 2012 2:46 pm    Post subject: Reply with quote  Mark this post and the followings unread

I can understand that. Adding a range switch would be easy anyway. I just wondered as I like the idea of being able to use it as an LFO as well. I like the idea of building modules to be as flexible as possible.
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J3RK



Joined: Jun 05, 2006
Posts: 99
Location: Seattle

PostPosted: Mon Oct 15, 2012 10:03 am    Post subject: Reply with quote  Mark this post and the followings unread

Your board/panel look great! Nice work! Interesting thermal coupling on the transistors (is that what I'm seeing?) Do you have a closer shot of this? What did you use there?
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telbonic



Joined: Jan 08, 2010
Posts: 38
Location: uk

PostPosted: Mon Oct 15, 2012 10:18 am    Post subject: Reply with quote  Mark this post and the followings unread

Samples or it didn't happen Very Happy
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fonik



Joined: Jun 07, 2006
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PostPosted: Mon Oct 15, 2012 9:41 pm    Post subject: Reply with quote  Mark this post and the followings unread

so i just made a VERY simple demo, just to proof it's amazing quality. the tracking is awesome:

Thomas Henry's 555-VCO from fonitronik on Vimeo.


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matthias
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elmegil



Joined: Mar 20, 2012
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PostPosted: Mon Oct 15, 2012 10:35 pm    Post subject: Reply with quote  Mark this post and the followings unread

You're determined to eat up all my budget aren't you? Very Happy

i was planning on the LFO, but now I think I will have to get this PCB too!
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fonik



Joined: Jun 07, 2006
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PostPosted: Tue Oct 16, 2012 3:31 am    Post subject: Reply with quote  Mark this post and the followings unread

you are welcome Laughing

anyways, i think i am at the lower end in regards to PCB prices, no?

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elmegil



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PostPosted: Tue Oct 16, 2012 5:15 am    Post subject: Reply with quote  Mark this post and the followings unread

Definitely, but there are so MANY good ones Wink
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ashleym



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

PostPosted: Tue Oct 16, 2012 2:14 pm    Post subject: Reply with quote  Mark this post and the followings unread

A few points

Fonik, I cant cope, I really cant. Thanks for doing what your are doing!!

Ian
Quote:
Unfortunately, that's not how things work any more. Good luck.

Here's what I recently spent the better part of nine months battling.


I cant imagine how annoying this all is. The vast majority of us are completely reliant on people like you to enable us to enjoy/love this SDIY thing. We rely on your genius because we dont have it. I am very happy to pay for this as this is the best and fairest way to do things. Ask Fonik, he is getting more and more of my money Exclamation Exclamation

Thomas- as we say in England- ta everso

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synthcube



Joined: Dec 21, 2011
Posts: 37
Location: boston

PostPosted: Tue Oct 16, 2012 5:19 pm    Post subject: Reply with quote  Mark this post and the followings unread

Yeah, me too. Lots of talented people who don't get enough money for their creativity or hard work.
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stahlblau



Joined: Jan 24, 2008
Posts: 14
Location: Herford / Germany

PostPosted: Mon Oct 22, 2012 10:43 pm    Post subject: Reply with quote  Mark this post and the followings unread

Wow... great work. Are the PCBs available?

I think i would take 2 or three of them Wink
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fonik



Joined: Jun 07, 2006
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PostPosted: Tue Oct 23, 2012 3:36 am    Post subject: Reply with quote  Mark this post and the followings unread

no PCBs yet. will have to order another prototype PCB for the frontpanel components...
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stahlblau



Joined: Jan 24, 2008
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Location: Herford / Germany

PostPosted: Tue Oct 23, 2012 3:39 am    Post subject:   Reply with quote  Mark this post and the followings unread

ok, thank you
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marvkaye



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

PostPosted: Tue Oct 23, 2012 4:57 am    Post subject: Reply with quote  Mark this post and the followings unread

fonik wrote:
no PCBs yet. will have to order another prototype PCB for the frontpanel components...


Is this going to be like the LFO controller, with a separate board for the panel components? If so, does that mean that the actual circuit PCB is locked in already? Just thinking out loud, but if there's a chance that this PCB could be completed and available anywhere near the same time as the LFO I'd like to combine my orders for obvious reasons...

<marv>
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ungleichklang



Joined: Dec 03, 2011
Posts: 83
Location: East-Belgium

PostPosted: Tue Oct 23, 2012 12:02 pm    Post subject: Reply with quote  Mark this post and the followings unread

fonik wrote:
so i just made a VERY simple demo, just to proof it's amazing quality. the tracking is awesome:

Thomas Henry's 555-VCO from fonitronik on Vimeo.



woowwww, WANNA HAVE Smile

nope,

MUST HAVE Smile

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dave_3283



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

PostPosted: Tue Oct 23, 2012 12:07 pm    Post subject: Reply with quote  Mark this post and the followings unread

Yeah, ditto. It sounds amazing, is a simple build, and sounds amazing. Also, it sounds AMAZING. I'm in for 2.
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fonik



Joined: Jun 07, 2006
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PostPosted: Tue Oct 23, 2012 12:36 pm    Post subject: Reply with quote  Mark this post and the followings unread

marvkaye wrote:
fonik wrote:
no PCBs yet. will have to order another prototype PCB for the frontpanel components...


Is this going to be like the LFO controller, with a separate board for the panel components? If so, does that mean that the actual circuit PCB is locked in already? Just thinking out loud, but if there's a chance that this PCB could be completed and available anywhere near the same time as the LFO I'd like to combine my orders for obvious reasons...

<marv>

yes, additional PCB for front panel components. however, i had to make some changes on the original circuit board to accommodate the front panel PCB nicely. so i will have to order new prototypes and build them to be sure. and the front panel PCB is not even finished yet (however, i will be finished soon).

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diablojoy



Joined: Sep 07, 2008
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PostPosted: Tue Oct 23, 2012 5:32 pm    Post subject: Reply with quote  Mark this post and the followings unread

That does sound really good, sync works well.
did note the sine level is quite a bit down though.
still i think i will have to buy a couple at least.

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fonik



Joined: Jun 07, 2006
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PostPosted: Wed Oct 24, 2012 12:57 am    Post subject: Reply with quote  Mark this post and the followings unread

diablojoy wrote:
did note the sine level is quite a bit down though.

on the scope it looked quite fine! i will re-check this.

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diablojoy



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PostPosted: Wed Oct 24, 2012 3:02 pm    Post subject: Reply with quote  Mark this post and the followings unread

Quote:
on the scope it looked quite fine!

hmm maybe just the patch used then.
Is it possible to bundle up with the controller LFO boards
I would ask for 2 of these and 4 of the lfo boards if the timing suits
I do not need panel pcb's
cheers

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Thomas_Henry



Joined: Jul 24, 2009
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Location: N. Mankato, MN

PostPosted: Wed Oct 24, 2012 5:37 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hi all,

Yes, the redoubtable Kansan, Scott Stites, and I spent a huge amount of time getting the amplitudes right on the various outputs (including an interesting trick along the way). If you check my measurements in the original post, you'll see that only the triangle is off by several tenths, but the other signals are dead on. (Or at least they were on the breadboards for Scott and me).

So, I wouldn't worry about it, unless Fonik turns up something we missed entirely.

Thomas Henry
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fonik



Joined: Jun 07, 2006
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PostPosted: Fri Oct 26, 2012 12:31 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thomas_Henry wrote:
So, I wouldn't worry about it, unless Fonik turns up something we missed entirely.

i'd rather turn up something I missed, hehe.

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