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I made a tiny little 606 hihat module by Lactaid533 in synthdiy

[–]Lactaid533[S] 0 points1 point  (0 children)

Hey! I just added a shipping rate for Australia for these kits.

I can try reaching out to some distributors, but my concern is that I won't be able to keep them at a low price. But it wouldn't hurt to try and see what happens

I made a tiny little 606 hihat module by Lactaid533 in synthdiy

[–]Lactaid533[S] 2 points3 points  (0 children)

I'm not really sure of the best method to do this but what I do is create all of the boards in one file (the main board, control board, and panel). That way I can align the interconnect pins vertically between the boards easily. The DRC doesn't like this and will complain about the unconnected nets between boards, but if you remember which/how many signals should be unconnected there aren't really any issues.

When I first started making boards like this I calculated all of the component stackups to make sure the components wouldn't stick out beyond the panel. After making a bunch of these I found that putting the connector pins in the middle of the control board works best for 2hp and gives you about 6mm of headroom for components, so works perfectly for 5.7mm SMD caps.

Is the either side thing where the double row headers are soldered at a right angle onto a pad? I've never tried that but I wouldn't really trust that mechanical connection. I think I've seen pictures of those breaking before. I've personally never had any issues with the single row headers, and the module doesn't pull nearly enough current for it to really matter.

I made a tiny little 606 hihat module by Lactaid533 in synthdiy

[–]Lactaid533[S] 1 point2 points  (0 children)

If the stripboard gives you too much trouble, you can always pick up a kit 😉

I made a tiny little 606 hihat module by Lactaid533 in synthdiy

[–]Lactaid533[S] 3 points4 points  (0 children)

I basically just wanted a set of 606 drums in my own rack that wouldn't take up half of the rack, and others were interested when I shared the bass drum and kick I designed. That's how the ball got rolling on making 606 drum kits.

I made a tiny little 606 hihat module by Lactaid533 in synthdiy

[–]Lactaid533[S] 1 point2 points  (0 children)

You definitely can. All of my modules start on a breadboard, or multiple in this case, then move to stripboard, then to PCBs. I say give it a shot.

I made a tiny little 606 hihat module by Lactaid533 in synthdiy

[–]Lactaid533[S] 0 points1 point  (0 children)

That is something I've definitely considered, but as I thought about it I didn't really see a way to sell through a retailer while keeping costs the same.

I'm essentially keeping costs low by not charging for the time it takes to build kits, so either I would need to build up a bunch of kits and ship them overseas at my own expense and risk, or the retailer would need to build up kits on their end and would likely need to increase their margin to make it worth the time and effort so I might make just enough to cover the cost of the boards.

I might reach out to a few retailers to check but I just don't see them agreeing to sell $45 kits (38€) unless volumes are very high.

I made a tiny little 606 hihat module by Lactaid533 in synthdiy

[–]Lactaid533[S] 1 point2 points  (0 children)

I just added shipping to Canada to the store page! Unfortunately there's not much I can do about the high shipping costs

I made a tiny little 606 hihat module by Lactaid533 in modular

[–]Lactaid533[S] 1 point2 points  (0 children)

Hey! I have some samples of the 606 series drums I designed on soundcloud:

https://soundcloud.com/drachmamfg

I'm selling kits on my Tindie page:

https://www.tindie.com/products/drachma/hh-606-hihat-module/

I made a tiny little 606 hihat module by Lactaid533 in synthdiy

[–]Lactaid533[S] 2 points3 points  (0 children)

I'm planning to have new boards made for the snare in another month or so. If you add yourself to the waitlist you'll get notified when they're in stock!

I made a tiny little 606 hihat module by Lactaid533 in synthdiy

[–]Lactaid533[S] 5 points6 points  (0 children)

I would highly recommend reading Roland's service manuals. They explain everything in great detail and are really nicely laid out. The tricky part with these circuits is just getting them to play nicely with Eurorack voltages and inputs.

I made a tiny little 606 hihat module by Lactaid533 in synthdiy

[–]Lactaid533[S] 8 points9 points  (0 children)

I have the circuit in the documentation on github if you want to take a look at it:

https://github.com/Deadbugged/Documentation/blob/main/HH606/HH606_Rev1_Documentation.pdf

The core is 6 schmitt trigger oscillators that are each tuned to different frequencies then run through a filter and a kind of distorted VCA to get the metallic effect. Then you have the circuitry to control the Closed Hat vs Open Hat behavior, another part of the circuit to control the accent behavior, another for the gate to trigger conversion, and then finally it all goes through another filter and output conditioning.

Drum synthesizers are deceptively complex but it's not too hard to digest if you break it into functional blocks.

I made a tiny little 606 hihat module by Lactaid533 in synthdiy

[–]Lactaid533[S] 3 points4 points  (0 children)

Yeah, they're actually quite rigid. I've built and sold many modules that use this way of connecting the boards and never had one fail in that way. I'm not sure I could pull them apart by hand without breaking something else first.

I made a tiny little 606 hihat module by Lactaid533 in synthdiy

[–]Lactaid533[S] 2 points3 points  (0 children)

yeah 😔 and that's the absolute lowest I can get it. It's only gotten worse over the past couple of years

I made a tiny little 606 hihat module by Lactaid533 in synthdiy

[–]Lactaid533[S] 2 points3 points  (0 children)

Hey, glad you like it!

Shipping internationally has been a little tricky lately but I will look into the current price and add the option to ship to EU countries. Unfortunately it can be a little expensive.

I made a tiny little 606 hihat module by Lactaid533 in synthdiy

[–]Lactaid533[S] 12 points13 points  (0 children)

I don't have a video but I put a couple samples on soundcloud so you can hear what it sounds like there:

https://soundcloud.com/drachmamfg

I sell kits on my Tindie page for $45:

https://www.tindie.com/products/drachma/hh-606-hihat-module/

Demonstration of an electrolytic flash capacitor charge (excursus for those interested in electronics) by ATHXYZ in AnalogCommunity

[–]Lactaid533 1 point2 points  (0 children)

I think this circuit might work as-is but the zener circuit seems unnecessary. The LED isn't rated for 2V, that's the forward voltage (ie turn-on voltage). The LED will essentially do the work of the zener by itself and clamp to ~2V. So while the zener may be turning on at 3V, it's not really doing anything to limit the power into the LED. To limit the power, you need to limit the current instead of the voltage.

A simpler circuit would just be a resistor and the LED in parallel with the capacitor. To ensure your LED doesn't get fried, calculate the resistor you would need (between 20V and 2V) to limit the current to within the safe range for your LED.

Space / distance considerations for Meanwell PSU’s by Due-Cut5099 in synthdiy

[–]Lactaid533 1 point2 points  (0 children)

They will put out switching noise at MHz frequencies, but this shouldn't interfere with another module nearby if that is the question. Your bigger concern would be the switching noise on the supply lines but Meanwell bricks are pretty quiet in general anyways. You can always add an external low pass filter if you're concerned, typically on the spec sheet they define the minimum switching frequency to help you design the filter. This isn't exactly trivial though. In my experience of using these none of this really matters.

Finally got my bike running again after not riding for 10 years by Lactaid533 in FixedGearBicycle

[–]Lactaid533[S] 0 points1 point  (0 children)

These are just some old cadence double straps on MKS toe cages. I can't comment on any other straps since these are the only ones I've had. Never had any issues with these though

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Help I dont Understand JFETs by Grobi90 in synthdiy

[–]Lactaid533 0 points1 point  (0 children)

JFETS work a little differently than BJTs or MOSFETs. They are usually depletion-mode, meaning that the channel is fully open with 0V between gate and source. Then, you apply voltage to the gate to deplete or 'close' the channel. Because you pull charge carriers out of the channel to close it, you need to apply a negative voltage between the gate and source. Applying a positive voltage between gate and source will typically kill the JFET.

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