The VCO Maximus

elmegil · Posted: Mon Nov 18, 2019 11:39 am Post subject:

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.

cslammy · Posted: Mon Nov 18, 2019 2:53 pm Post subject:

cslammy · Posted: Sat Nov 23, 2019 10:12 am Post subject:

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.

ixtern · Joined: Jun 25, 2018 Posts: 145 Location: Poland

matimatil · Joined: May 17, 2020 Posts: 2 Location: Argentina

does anybody by any chance have a sigle sided pcb layout for this?
if not i am probably gona give it a shot, but i am not very good.