Hi Stefan,

I've sprinted through ~30 SMD populated builds from CalSynth in the last 6 weeks so I've got a few different cleanup tasks, but this is the first:

I built two Alstadens, and both exhibit the exact same vibrato. I can't suss it. I used tempos from Modular Addict in the US (https://modularaddict.com/akaneohm-tempco-3300ppm)

Here's a video showing the behavior on both modules.

https://photos.app.goo.gl/3Ehrnx1nxFNmjukAA

Thanks!

Hey guys,

I was banned by Mouser from buying silicone-based components (diodes, ICs etc) last year as they thought I was an unauthorized reseller. After I explained that I was just an enthusiastic hobby soldering guy they unbanned me and flagged my profile as non-business.

But now I'm affected by the ban of AD (Analog Devices) components for non business customers - Mouser cancelled the respective components from my last order with that exact reason. As I suspect all other vendors (Digikey, TME, etc ) will also not sell me AD components I started to look for alternatives. I was able to find something for almost every AD part, except the LT1931 inverting boost converter.

@Stefan : are you aware of any other inverting boost converter I could use instead of the LT1931? I currently have the PCBs for a workbench on order but the POW! does use the same…

Can I use a 100k trimmer instead for the gain trimpot? Thank you

Hello, I am about to finish the Euphoria Synth. Most of the pcbs are working fine, except the envelope PCB for which I have a missing CD4001. I am also missing the tertiary oscillator pcb. Xan those be bought separately?

However, my problem concerns the Primary oscillator, which is very high pitched even at the lowest primary oscillator frequency level. I tried changing the C34 to a lower value, which indeed allows me to set a lower frequency, but then the slider has only a limited action. And as I read from the CEM3340 datasheet usually that capacitor is fixed to 1.5nF, so I guess this is only a bad solution. There is probably a wrong value somewhere, but rather than desoldering everything, maybe there could be a hint at which components to check first, or a hint on some voltage's I could measure on some pins. Most IC's seem…

Hello,

I picked up a Chiasso V2 with the SMD pre-soldered and am having a strange issue with the triggers. The left trigger iis the only trigger that will work, and only if I have something plugged into the right trigger jack. The right side will only make sound if I adjust the back potentiometer to allow it to drone. Any triggers in the right side do nothing regardless of settings and the LED does not light. Any help would be appreciated.

Hi folks,

Once again may I get the resistors that control LED brightness for the Sum V2? All I had were ultra brights unfortunately and they are way to bright with the default resistance value. Thanks!

Greetings

I've acquired a SMD populated Natural State and the left channel doesn't work at all.

I've replaced all ICs with the exception of the TL072 op-amps and reflowed every component in the board. (in the left channel area).

I see that the left CTRL LED dimly cycles following the LFO rate at times, but that's about it for what activity I can see when the module is powered up.

Unfortunately I have not been able to use my multimeter because the power cables in my case are pretty short.

Apart from replacing the TL072 op amps. Any other ideas of what could cause the left channel to not work at all?

Hi folks,

I got the presoldered PCB for the Serial module and my LEDs are super high brightness which usually need around 4.7k - which resistors would be correct to replace for lowering LED brightness?

Any quick tips for improving Radio's reception? Usually it's fine when using a long patch cable (1.5m), but in some basement live settings, picking up any stations is difficult.