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 Forum index » DIY Hardware and Software » Thomas Henry designs
The VCO Maximus
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elmegil



Joined: Mar 20, 2012
Posts: 2117
Location: Chicago
Audio files: 16

PostPosted: Mon Nov 18, 2019 11:39 am    Post subject: Reply with quote  Mark this post and the followings unread

Are you sharp or flat?

If you're sharp, your HF trim is probably providing too much trim, and you need to turn it down and start over.

I don't know off the top of my head which way (cw vs ccw) is "turn it down", unfortunately.

The idea of the HF trim is that, as a VCO gets higher frequency, it tends to go flat, and the HF trim gives a little bit more juice back to the control to bring it up to being in tune.
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cslammy



Joined: Apr 27, 2018
Posts: 188
Location: USA

PostPosted: Mon Nov 18, 2019 2:53 pm    Post subject: Reply with quote  Mark this post and the followings unread

elmegil wrote:
Are you sharp or flat?

If you're sharp, your HF trim is probably providing too much trim, and you need to turn it down and start over.
.


Going flat.
Hi Freq trim does almost nothing--I can turn it so it clicks either way, which in my mind means it has gone as many turns as it can go--with very little impact. Maybe a few cents sharp or flat for a 7K triangle, that's it.

Q: For other users, does the HF trim "do a lot"? For the 13700 TH VCOs I built the HF trim was far more effective--but having never put my hands on the maxiums design, I am not sure what to expect here. If the HF trim is impactful on other VCO's I might have another issue somewhere.

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cslammy



Joined: Apr 27, 2018
Posts: 188
Location: USA

PostPosted: Sat Nov 23, 2019 10:12 am    Post subject: Reply with quote  Mark this post and the followings unread

I replaced the trimmers (12 turn cheapos) with bourns 25 turn for normal and HF trim. Seems to have fixed it. I think I just wasn't able to dial in my settings with enough specificity.
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ixtern



Joined: Jun 25, 2018
Posts: 143
Location: Poland

PostPosted: Thu Nov 28, 2019 12:16 am    Post subject: Reply with quote  Mark this post and the followings unread

cslammy wrote:

Hi Freq trim does almost nothing--I can turn it so it clicks either way, which in my mind means it has gone as many turns as it can go--with very little impact. Maybe a few cents sharp or flat for a 7K triangle, that's it.

Q: For other users, does the HF trim "do a lot"? For the 13700 TH VCOs I built the HF trim was far more effective--but having never put my hands on the maxiums design, I am not sure what to expect here. If the HF trim is impactful on other VCO's I might have another issue somewhere.

Don't know if you still have a problem with HF tracking but yesterday I was tuning my VCO Maximus again and HF trims works as intended. I can see tracking change from about 1000 Hz and up. It's not a big change - a few Hz for a few trim turns but still noticeable.
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