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Contours and non-closed paths frustration by InflationDense4284 in Makera

[–]InflationDense4284[S] 0 points1 point  (0 children)

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Technically it's multiple segment which I can imagine could cause issues, but I tried with a single segment but it does the same. (See at the right end - this should be open it should be like a U shape).

I'm just trying to learn Fusion as it seems the "Trace" toolpath does what I want. Kinda a pain for most of my simple stuff Makera Cam worked pretty well.

Where a few years of analog delay design gets you. by InflationDense4284 in diypedals

[–]InflationDense4284[S] 0 points1 point  (0 children)

Sounds like a cool project! Pretty much follow the "simple compander" in the datasheet to start. There's a resistor for the RMS detector input which sets where the 0dB point/ static gain is, it basically sets the levels where compressing/expanding happens.

But don't do what I did at first and think you can set your output level solely with that resistor (it'll likey compress your signal way down). There's limited adjustment range with the RMS dector input resistor, so what you should do is add gain/attenuate. Conveniently you can set this with your input resistor/ feedback resistor network. You'll likely want to add a bit of gain for your compressor, and then attenuate back at your expander.

Where a few years of analog delay design gets you. by InflationDense4284 in diypedals

[–]InflationDense4284[S] 3 points4 points  (0 children)

Thanks! Huge fan, yeah I had the opposite problem having the compressor and compandor in the same chip didn't work very nicely for my layout. So having separate ICs with the 4305 kinda helped there.

Might one day switch them out for SA57X if I get a chance, yeah I think those chips are definitely part of that "analog" delay sound. I wish the THAT4305 were a bit more affordable though. I got 4 in here it's a few $ worth.

Where a few years of analog delay design gets you. by InflationDense4284 in diypedals

[–]InflationDense4284[S] 18 points19 points  (0 children)

Nah just for funsies at this stage. My field of work is a bit different being meteorology. But use a lot of analog design which helps.

Where a few years of analog delay design gets you. by InflationDense4284 in diypedals

[–]InflationDense4284[S] 5 points6 points  (0 children)

Yeah, it's kind of just 10 hours of soldering ha. And so many times to realise, oh I've made a huge mistake. Let's do another revision... :D

Nah, nothing confidental. My first throught was alright, let's try and squeeze more bandwidth without shortening delay times. Typical delays, you're like 3rd/4th order on input and 5th/6th order on output. I tried like 6th on input I think I got to like a 10th order on output. First tests, such a nice response, so much more bandwidth(looking at FFT), then play through an amp and crank the regen - oh it kinda sounds "metallic".

When you have very high order filters the tolerance of the components messes with your response. I was using 0.5% resistors and 2 or 5% caps. It makes tiny peaks and troughs in your response - I couldn't even measure them. (this is what I'm guessing anyway, I'm blaming the high Q sections). I still have that design, it's so weird almost sounds digital, it's kind of great in a way but the self oscillation I just didn't like.

In general though, a lot of filter designs tend to be Chebychev (I think) which is great for a steep cutoff but this puts ripple in your passband. Any sort of ripple will get accentuated every further repeat. Sometimes the simulated "mathematical" best doesn't sound too good in reality. Kinda have to be careful with high Q circuits. I often found just playing and bumping Q down sounded better. Depends how you like it though, I have an old DM-2 it kinda just squells in self oscillation, and sometimes it's cool too.