DIY 100kHz VCO - Build & Test

RE: DIY 100kHz VCO - Build & Test

shabaz — Mon, 23 Aug 2021 14:53:20 GMT

I tried experimenting over the weekend with a low-cost scriber, to see if it could become a more useful tool for copper clad.

I think the results were just average, and probably the perspex cutter tool you mention may be better. Anyway, it kind of works.

Basically I took a Dremel grinder wheel to it, but that had zero effect, so then a diamond-coated slitting wheel was attempted (with it partially in water so that it wouldn't overheat the scriber tip). It was all handheld dremelling so there's no accuracy, but I managed to make a groove in the scriber.. seems to scoop out copper+FR2, good enough for the few times I need to do it.

I don't know what the optimal shape is.

Anyway, the workflow with this is to either first cut a line into the copper using a craft knife, or just skipping that and just using the grooved scriber in a single step.

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RE: DIY 100kHz VCO - Build & Test

colporteur — Wed, 11 Aug 2021 00:46:38 GMT

Great video resource links. Enjoyed the techniques.

RE: DIY 100kHz VCO - Build & Test

shabaz — Tue, 10 Aug 2021 21:01:11 GMT

Hi Navadeep,

Nice prototyping! It seems like a very useful way of creating VCO capability for this frequency range. There is LM331 but it's really expensive in comparison, making LM331 often impractical : (

I have trouble cutting the copper too, good idea about that perspex cutting tool!

RE: DIY 100kHz VCO - Build & Test

DAB — Tue, 10 Aug 2021 18:22:44 GMT

Nice post.DAB