Hi everyone, I'm new to this forum. I've search an "introduce yourself" section with no luck so I'll first do that :
I'm french so my English may be strange sometimes. I'm 44.
I've started audio electronics DIY in 2010 with no electronics knowledge. I've built dozen of stomboxes and started synth stuff in 2017/2018 with the MFOS Soundlab Ultimate,with success !
I've also started designing my own PCBs layouts with KiCAD around 2014. I'm a Free Software enthusiast.
Since, I've built more than 20 eurorack modules, most of them self-design PCBs from MFOS, YuSynth and other projects. Also did some modules on perfboard...
I've design 2 complete standalone synths, very much clone of the Soundlab, for friends.
If you want to check some of this work go here https://zombiesonore.fr
Lately, I've found new joy with SMD soldering by building the Per|former sequencer.
I'm happy to join this forum and thanks everyone in advance for there help and friendliness.
---
Now, the main topic of this thread.
I've designed a 2 boards (stacked) clone of Mutable Instruments Kinks, and there is a fault in the S&H section. It sample but doesn't hold long, only for a few ms. The voltage quickly goes up or down to GND level.
The design is mostly SMT components (0603). I've used TH components for the 22µ capacitors and for the tantalum caps. I've used the same references from Mouser for the ICs (TL074, OPA4171AIPW, LM321). And same Mouser reference for the "voltage memory" cap (10n COG). Same thing for the 1N4148 diodes.
For the FET, I've used MMBFJ309LT1G. Also tried MMBF5457 with same result.
I've found 2 errors in my schematic, and corrected it on the board = same result.
I've tested the circuit on breadboard with basic components (TL074, 2N5457, 10n film cap) and it's working perfectly.
I came to the conclusion that my PCB design was not good.
All my trace were 10 mils and the components were wildly spaced and sometimes not in a very logical place. So I've done a new layout, using 10 mils and mostly 19 mils traces. Components more close to each other, and only one GND pour on the bottom (top is for the components and traces).
With this new version, it work a little bit better but really not good enough.
This really behind my electronics knowledge. Bad PCB design ? Bad components choosing for resistors (but they are working well in the other section) ?
Here's a link to pictures and schematic:
https://zombiesonore.fr/mi-kinks-clone-bad-sh/
Thank you to everyone who has read this. Any ideas are welcome!
I'm french so my English may be strange sometimes. I'm 44.
I've started audio electronics DIY in 2010 with no electronics knowledge. I've built dozen of stomboxes and started synth stuff in 2017/2018 with the MFOS Soundlab Ultimate,with success !
I've also started designing my own PCBs layouts with KiCAD around 2014. I'm a Free Software enthusiast.
Since, I've built more than 20 eurorack modules, most of them self-design PCBs from MFOS, YuSynth and other projects. Also did some modules on perfboard...
I've design 2 complete standalone synths, very much clone of the Soundlab, for friends.
If you want to check some of this work go here https://zombiesonore.fr
Lately, I've found new joy with SMD soldering by building the Per|former sequencer.
I'm happy to join this forum and thanks everyone in advance for there help and friendliness.
---
Now, the main topic of this thread.
I've designed a 2 boards (stacked) clone of Mutable Instruments Kinks, and there is a fault in the S&H section. It sample but doesn't hold long, only for a few ms. The voltage quickly goes up or down to GND level.
The design is mostly SMT components (0603). I've used TH components for the 22µ capacitors and for the tantalum caps. I've used the same references from Mouser for the ICs (TL074, OPA4171AIPW, LM321). And same Mouser reference for the "voltage memory" cap (10n COG). Same thing for the 1N4148 diodes.
For the FET, I've used MMBFJ309LT1G. Also tried MMBF5457 with same result.
I've found 2 errors in my schematic, and corrected it on the board = same result.
I've tested the circuit on breadboard with basic components (TL074, 2N5457, 10n film cap) and it's working perfectly.
I came to the conclusion that my PCB design was not good.
All my trace were 10 mils and the components were wildly spaced and sometimes not in a very logical place. So I've done a new layout, using 10 mils and mostly 19 mils traces. Components more close to each other, and only one GND pour on the bottom (top is for the components and traces).
With this new version, it work a little bit better but really not good enough.
This really behind my electronics knowledge. Bad PCB design ? Bad components choosing for resistors (but they are working well in the other section) ?
Here's a link to pictures and schematic:
https://zombiesonore.fr/mi-kinks-clone-bad-sh/
Thank you to everyone who has read this. Any ideas are welcome!
Statistics: Posted by zombiesonore — Sat Jul 13, 2024 4:05 am — Replies 1 — Views 36