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 Forum index » DIY Hardware and Software » Thomas Henry designs
Improving VCO-1
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Arda Eden



Joined: Nov 14, 2020
Posts: 10
Location: Turkey

PostPosted: Mon Dec 14, 2020 6:40 am    Post subject: Improving VCO-1
Subject description: Possibility of adding sawtooth output to VCO-1
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Hi there,
I have 2 of Thomas Henry's VCO-1 in my modular and I am very happy with those guys. The only thing missing is a sawtooth output. Is it possible to improve this circuit by adding sawtooth out?

https://www.birthofasynth.com/Thomas_Henry/Pages/VCO-1.html
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gabbagabi



Joined: Nov 29, 2008
Posts: 651
Location: Berlin by n8
Audio files: 23

PostPosted: Tue Dec 15, 2020 12:22 am    Post subject: Reply with quote  Mark this post and the followings unread

May you have a look here

https://electro-music.com/forum/topic-27934.html
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gabbagabi



Joined: Nov 29, 2008
Posts: 651
Location: Berlin by n8
Audio files: 23

PostPosted: Tue Dec 15, 2020 7:13 am    Post subject: Reply with quote  Mark this post and the followings unread

totaly unexpected i got access to a real computer,
not that fcking phone,
so i was able to draw something


tri2saw.png
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Arda Eden



Joined: Nov 14, 2020
Posts: 10
Location: Turkey

PostPosted: Sat Nov 13, 2021 12:01 am    Post subject: Reply with quote  Mark this post and the followings unread

I was not around for a while and haven't seen your reply. Now I am back and thank you so much for the schematic. I will add this improvement.

Another question is that:
The tempco on the original schematic is 3500ppm. I haven't got one but few 3300ppms. Will they also work? Can I use 3300ppm?
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gabbagabi



Joined: Nov 29, 2008
Posts: 651
Location: Berlin by n8
Audio files: 23

PostPosted: Fri Nov 19, 2021 10:50 am    Post subject: Reply with quote  Mark this post and the followings unread

Glad you are back!

i have no experience with tempc0s

why dont you just try it
and if you see that you cant life with the 5,71% error-
change it

good luck!
Keep well!
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Arda Eden



Joined: Nov 14, 2020
Posts: 10
Location: Turkey

PostPosted: Fri Nov 19, 2021 11:06 am    Post subject: Reply with quote  Mark this post and the followings unread

Thanks. Actually, I realized that the schematics says it is 3300ppm. But on the website it is written as 3500ppm. Maybe a typo ... I used the 3300 and it works great. Now it is time to add the saw converter you drew.
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Gingoism



Joined: Feb 01, 2017
Posts: 23
Location: Singapore

PostPosted: Wed Nov 24, 2021 12:06 am    Post subject: Reply with quote  Mark this post and the followings unread

IMO a "tempco" is usually a luxury and not a necessity unless you are a stickler for rules. Some of my poorly made VCO(s) which all use basic 0.1% resistors in place of "tempcos" are functionally solid with very few pitch drifts in different ambient temp settings.
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