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 Forum index » DIY Hardware and Software » Thomas Henry designs
T.Henry VCO1 goodness
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Wobuse



Joined: Dec 07, 2011
Posts: 26
Location: Lyons,il

PostPosted: Tue May 28, 2013 3:09 pm    Post subject:  T.Henry VCO1 goodness Reply with quote  Mark this post and the followings unread

Just powered up my Thomas Henry VCO1,works great.
Here is a pic of the front panel...
Posted Image, might have been reduced in size. Click Image to view fullscreen.

Here is the triangle wave...
Posted Image, might have been reduced in size. Click Image to view fullscreen.

The pulse wave....

Posted Image, might have been reduced in size. Click Image to view fullscreen.

And the almighty sine,after a lil tweaking...

Posted Image, might have been reduced in size. Click Image to view fullscreen.

Here is the T Henry sine on top & my function gennys on the bottom..

Posted Image, might have been reduced in size. Click Image to view fullscreen.

I still need to get it mounted to its back plate & then epoxie the tempco & matched transistors (expo pair)together before I tune it up for equal temper... :

...also have a MFOS calibrator that is almost assembled ,to aid in that processs.

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forbin



Joined: Jan 29, 2009
Posts: 115
Location: Fremantle, Australia

PostPosted: Thu May 30, 2013 6:43 am    Post subject: Reply with quote  Mark this post and the followings unread

Actually out of all my VCO's (ans there are a LOT) I think that the VCO1 still has the sweetest sinewave of them all...
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Wobuse



Joined: Dec 07, 2011
Posts: 26
Location: Lyons,il

PostPosted: Thu May 30, 2013 9:04 am    Post subject: Reply with quote  Mark this post and the followings unread

forbin wrote:
Actually out of all my VCO's (ans there are a LOT) I think that the VCO1 still has the sweetest sinewave of them all...

Hey ,,this is good to know! Surprised

Here is the artwork for my next VCO...
Tom Henry's 4066 VCO...

Posted Image, might have been reduced in size. Click Image to view fullscreen.

I have sum more compact knobs on the way.
Will prolly switch the knobs on the VCO1 ,aswell.

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www.retrosonik.com
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oculus



Joined: Oct 30, 2011
Posts: 29
Location: Iceland, Reykjavik

PostPosted: Thu Jul 11, 2013 9:07 pm    Post subject: Reply with quote  Mark this post and the followings unread

hi i just breadboarded a VCO-1, and using thomas henry 15volt powersupply i just finished to power it up.
the vco it seems to work, but the only thing is that, when i increase the pulsewith the pitch also seems to go a little bit up
along with the pulsewith, does this happen to you guys also ?

the pitch drops almost a semitone from almost full left to almost fully right
on the pw knob.



btw i don´t have a tempco in the VCO-1 yet im waiting for it to arrive
but don´t think this should affect this problem,(in fact it track quite well without the tempco)
thanks kind regards
Oculus
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Wobuse



Joined: Dec 07, 2011
Posts: 26
Location: Lyons,il

PostPosted: Fri Jul 12, 2013 4:21 pm    Post subject: Reply with quote  Mark this post and the followings unread

I don't have my VCO online,as I have yet to build a new power supply ,for my modular.If its still on a bread board ,with no tempco, the heat of your body ,could well change the pitch as you adjust it.
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