This post is from a suggested group
hey there, I`ve built a Duck, checked for cold joints, right orientated components and so on. But no matter what I try I cannot get audio out of this module.. the yellow led is constently on. red led works with gates and settings.
Any idea, what do to check first?
This post is from a suggested group
Hi Stefan,
Could I trouble you for the schematic for LFOT? I have three pcb sets. Built the first one and it's all good except the PWM control doesn't work via pot or CV.
Many thanks
Thank you for the schematic. Instanteously realized that I fundamentally misunderstood the PW jack is an output not a CV input, and the Pulse Width pot affects that output.
Did not RTFM to see it has three outputs. ugh.
This post is from a suggested group
Hello folks!
Hello folks!
After having some self-soldered ST modules sitting on the shelf for years, I am now seeking professional help.
I don't know what else to do.
I have a Tryfelo and a Singer here, but they don't seem to be doing anything.
No LED lights up, there's no flickering and no sound is coming through either.
Hey,
On Singer, the offset VCA trimmer is missing. Is there any particular reason for that?
As for Tryfelo, are you getting +12 V and -12 V on all IC power pins?
Thanks,
Stefan
This post is from a suggested group
Is there a way to modify the Cion so that in envelope mode, it has a faster attack? I love the attack available when using it in OSC mode as an envelope, but I'd love to have longer decays, hence using ENV mode.
Hi Julian,
Yes, but there is a trade-off. In ENV mode an additional 47 nF timing capacitor is switched in, which makes both attack and decay much longer than in OSC/Audio mode.
You could reduce C2 from 47 nF to, for example, 22 nF for a faster ENV range. However, this will also shorten the maximum decay.
Getting the very fast OSC attack while keeping the long ENV decay would require a more involved modification, since both share the same timing capacitor. Thanks, Stefan
This post is from a suggested group
Hi! I built a Chiasso and I'm having a lot of fun with this module! But I noticed that the noise volume is quite low, even when turned up all the way. Is there a resisitor value I can change in order to increase the volume? Or should I change the noise transistor, I hear they can be quite different regarding the noise output...
Thank you in advance!
Hi Herr Fetz,
great to hear you're enjoying the Chiasso! 😀
Yes, the noise level can vary between individual transistors. However, the easiest and most predictable way to increase it is to change R8 from 1.5M to 2.2M. This increases the gain of the noise amplifier without changing the noise generator itself.
If that's still too quiet, you could try 3.3M. Changing Q7 may also affect the level, but the result is less predictable.
Best,
Stefan
This post is from a suggested group
Hi Stefan,
I just bought the panel/pcb for the the DII One however on trying to order the components, I'm struggling to find the USB C connector you specify (USBC1-AF-046). It only seems to be via JLCPCB, presumably ony for assembly by them. I can't find it anywhere else online :( Do you think the following would fit? USB4930-00-A
Hi Martin,
I checked the datasdheets more closely.
Unfortunately, the GCT USB4930-00-A will not fit the DII·ONE PCB. It is a top-mounted connector and uses a different footprint and mounting-tab arrangement.
A suitable replacement is the Molex 216990-0001 (Manufacturer number: 2169900001)
The Molex connector is available from distributors such as DigiKey and Mouser. DigiKey also offers it as a cut-tape component, so it should be possible to order a single piece instead of a complete reel.
Please use the Molex 216990-0001 instead of the USB4930-00-A.
Best regards, Stefan
This post is from a suggested group
Got a Midi Thru that won't power when conncted to any USB-C power supplies and cables. I run most of my equipment with USB-C using the Myvolts Silent Alchemist. Plus I have Apple power supplies too. Nothing powers the Midi Thru.
I even had a replacement sent and had the exact same issue. I powered it first with an Apple iphone power supply and nothing. No signs of anything burning out, smell etc.
Genuinely baffled. Any help would be appreciated ✌️
Hi Stefan, this worked a treat, powering from a USB-A port. Thanks so much!! Loving the MID Thru, such a neat solution 🙌
This post is from a suggested group
Just finished building a Krakong and I honestly can't tell if it's working right or how to calibrate it, even after reading the manual a dozen times. Is there any sort of video online showing how to use it and how to properly calibrate it?
I also don't think my right-side serial sequencer is working right. I'm not getting any CV out of the CV OUT of it, and I'm also not getting anything out of the NOISE output.
Also, is there a way to get the oscillators to track 1v/oct?
Thanks!
Stefan,
Thank you for the incredibly detailed reply. I will be checking all that out over the next day or 2. I took photos of my PCB, too, in case you notice any glaring issues, or if anyone else wants to see it. If necessary, I will also make a video of issues as I go through it.
One thing I noticed about the right serial sequencer is that the 4 gate outputs are always in sync, whereas the left side is obviously doing some sort of sequential thing.
I also find that even with the volume turned down on all knobs, it still outputs sound from both oscillators quietly.
Be well!
Quick update: moving the jitter calibrator provided noise at the noise output, but no change to the sequencer. I'll toy with it more and check those solder spots.
Julian
This post is from a suggested group
Hello! I built a Cause & Effect module from Calsynth. It came with all SMD components presoldered. The remaining LEDs, thonkiconns, switch, and pot seemed relatively straightforward to finish assembling,
Every time I power on the module, the two LEDs start pulsating at a regular pace, maybe 100 BPM or so. None of the subsections seem to work properly. The output on the S&H, for instance, doesn’t hold a stored voltage, and it produces a clock-like output at the same pace that the LEDs are always strobing,
I have no idea why it’s acting like this, Any ideas?
I'm not sure which mode is T&H vs S&H. But in both cases, the LEDs continue to flash at their internal rate, not at the rate set by the signal received at HOLD GATE when patched. In one mode, no signal is output at HOLD OUT regardless of whatever is patched at HOLD IN and HOLD GATE. In the other mode, the pulsating continues at the HOLD OUT regardless of whatelse is patched - the is mostly at zero except for the regular pulses.
Hey Nys, I would start with the VCA/main board:
Reflow suspicious solder joints, start with the ICs.
Check the board connections with the headers
Check the supply rails: +12 V / -12 V at TL074 and LM13700 (U2), and the +10 V reference around LM4040 (IC6) and U1 (Pin 1).
With no audio connected, measure VCA_OUT DC (lower pad of R31) voltage. It should be close to 0 V. If it is strongly positive, negative or near a rail, check U1B, R31, R32 and LM13700 (U2), especialy for solder bridges or bad joints.
Apply a gate and measure CV_TO_VCA (left pad of R15). The voltage should clearly change with the envelope. If it does, continue through U1C → Q2 → LM13700 pin 1. This is the VCA control-current path.
The constant yellow LED is especially interesting because its driver monitors VCA_OUT. So I would measure the DC voltage at VCA_OUT first. If you send me that voltage plus the voltage at CV_TO_VCA with and without a gate, we can narrow it down quickly. Thanks,
Stefan