dubtoms wrote: ↑

Fri Jan 22, 2021 1:22 pm

I guess I know why I've had issues with recent builds... Probably not a good idea to source op-amps from Aliexpress

Yeaaah.. definitely a minefield on that site man. Some good, some bad, some absolutely awful.

This is a pretty nice writeup on this topic:

https://northcoastsynthesis.com/news/un ... apacitors/

Yikes. COVID delay/ripple effect I assume? A little but not the main cause. On average Semiconductor usage grows by about 5% per year so you need to build new fabs every year. But it's definitely boom and bust. The memory people feel this the most as their fabs are the most expensive, but building ...

I just ordered a bunch of 74s from Tayda at the start of this week. Glad I saw this, I'm gonna giive them a close look over just to make sure. I have a giant batch of TL072s from Tayda. I'll take a look too. I had been buying 074s from them, but then realized in bulk (100+), Mouser was cheaper than...

Should we be worried about 074s and 072s going scarce for some reason? All ICs will be going scarce for at least the next year. Current semiconductor demand far exceeds supply, as the automotive industry is discovering and having to cut back vehicle production significantly. Most fabs are already a...

Should we be worried about 074s and 072s going scarce for some reason?

Thanks h0wser! I'm working on the build documentation right now, probably 75% done. Just have to knock out the final BOM and get panels in and we should be golden.

thanks. the kick and hats sit really well in the mix. a complete 606 in euro would be sweet I'm working on basically what is a DR110 with all voices in euro right now. The DR110 is very similar to 606. This would be just the voices, no sequencer. Figured I'd mention it though! Any news on this? :pa...

You could just use a BJT or JFET to drain the cap (C3) when issued with the reset pulse.

Heck yeah, I was wanting a full size analog oscope module for my rack!

Does transition time refer to the steepness of the rising edge, or the delay in responding to changes on the inputs? Either way, I'm only using it to clock a sequencer at "musical" rates, so I doubt the sort of lag this might cause would matter much here. yeah, the former. The capactive load seen b...

As guest mentioned, the transition speed will increase with a lower pullup, but will draw more current in the off state. 150k is pretty huge. That will make a pretty miserably slow transition, but for this maybe it is OK? The LM339 is not a particularly high speed comparator, but for example the tra...

^Exactly. JLC and such are used to doing films and custom silks all day, but batch your PCBs on a huge piece of stock with other customers...that's part of their efficiency. There's really nobody doing that with metal work AFAIK. So, most shops, even if they are not outsourcing for the silkscreen wi...

...Some sort of JLCPCB/PCBway equivalent but for aluminium panels, ideally with options for anonoized aluminium and brushed aluminium. Thanks! This does not exist. I used to use Chinese vendors for getting panels anodized and then laser etched, but it's not particularly cheap per so. In resonable v...

There's a whole thread on this already. https://www.muffwiggler.com/forum/viewtopic.php?f=17&t=235904&hilit=cnc A couple of us are successfully making prototypes on cheap CNC routers, but more like in the $500-$800 range. The REALLY cheap ones are essentially worthless for doing metal. They are flim...

Pretty soon I think. I'm requoting some of my production panels right now and this is in the mix.!

Yeah, a OTA such as the LM13700, CA/AS3280 or a current-output VCA like the 2164 are probably the most common and least exotic.

Love it. So is that 303_98 as in 1998? You've been at this a hot minute eh?!! (Label me completely not shocked at that fact if it is true due to your depth of knowledge!)

Brad s wrote: ↑

Tue Jan 12, 2021 7:32 pm

I'm right there with you, my friend.

Let's have another, shall we?

Whipped out a demo video tonight. I'm slowly getting the hang of doing these, but still suck at it. lolz.

Man, I've been binging on Doom hard for the past week. My god that guy was good. RIP.

Nice one! Harald reigns as the productivity champ here on Muffs diy!

Oh, I didn't know you wanted more than 1 signal. You CAN add signals with a non-inverting configuration, but it is more complicated, and you would add feedback resistors. But, things are not as clean cut. So, yeah, that's why it's easiest to add with an inverting summer, at the virtual ground point....

If you don't want any gain, the simplest thing would be to just use a buffer (since that seems like what you are trying to do is buffer the high pass filter you have created with the 1u cap right? So that first part would be like this:

Hahah, goddamn. That's pretty funny