gkasprow commented on pull request sinara-hw/kirdy#23
Kirdy Revision 0_3I meant using tantalum caps at the SET pin of LT304x. This is the most sensitive pin. LT304x has quite good PSRR, but every noise on SET pin is amplified and present at the output.
gkasprow commented on issue sinara-hw/kirdy#13
sch/pcb review> > reference grounding is done on purpose? > > Yes. It is done on purpose for a continuous reference plane for critical analog signals. I meant strange connections of GND in voltage…
gkasprow commented on issue sinara-hw/kirdy#13
sch/pcb reviewif you want to keep the noise low, avoid X7R/X5R capacitors in the current source circuit due to microphonic effect. related parts: C69, C70, C192, C13 (!), C172, C173, C152
gkasprow commented on issue sinara-hw/kirdy#13
sch/pcb reviewreference grounding is done on purpose?
gkasprow commented on issue sinara-hw/kirdy#13
sch/pcb reviewadd dual footprint for LTC6655 as we do in Stabilizer/Sampler etc, it solves issue with component availability
gkasprow commented on issue sinara-hw/kirdy#13
sch/pcb reviewadd LEDs for critical power rails, just use 1mA current add testpoints with labels for cricital power rails
gkasprow commented on issue sinara-hw/kirdy#13
sch/pcb reviewadd legend to the DIP switches
gkasprow commented on issue sinara-hw/kirdy#13
sch/pcb reviewFB8,FB9 have very low impedance in kHz region. They are good do decouple RF. I'd replace them with standard inductor; make sure you place lossy capacitor ( poor tantalium or series RC) after the…
gkasprow commented on issue sinara-hw/kirdy#13
sch/pcb reviewyou are using a lot of tantalium caps; the low ESR ones are expensive, I'd replace some of them by ceramic ones. If you need some non zero ESR, just add 0.5Ohm resistor in series.
gkasprow commented on issue sinara-hw/kirdy#13
sch/pcb reviewpls make 3D model of the laser module and install on top of Kirdy to make sure there is no conflict.
gkasprow commented on issue sinara-hw/kirdy#13
sch/pcb reviewthere are grounding resistors close to the panel fixing holes. PLS add 3D model and check if they aren't too close. The USB may not be well positioned and may not protrude through the panel the…
gkasprow commented on issue sinara-hw/kirdy#13
sch/pcb reviewthere is MCU extension connector, do you plan some mezzanines in the future? I'd route 12V as well and add some mounting holes
gkasprow commented on issue sinara-hw/kirdy#13
sch/pcb reviewI plan to make DIOT version of it sooner or later :)
gkasprow commented on issue sinara-hw/kirdy#13
sch/pcb reviewI'd add mounting holes for laser module. At least 4, with soldered Wurth standoffs. Look how I did in Thermostat EEM
gkasprow commented on issue sinara-hw/kirdy#13
sch/pcb reviewif you need 3d models, you can simply unpack Altium pcbdoc file. It's container. I use 7 zip to extract all step files.
gkasprow commented on issue sinara-hw/kirdy#13
sch/pcb reviewI meant this by talking about ground loops https://www.analog.com/en/analog-dialogue/articles/reducing-ground-bounce-in-dc-to-dc-converters.html
gkasprow commented on issue sinara-hw/kirdy#13
sch/pcb review- there are still no clearances between primary and secondary side of Ethernet / PoE. Keep at least 1mm clearance
gkasprow commented on issue sinara-hw/kirdy#13
sch/pcb reviewFor most of the via under pads situations yes, but for the thermal vias under power hungry chips I think it is still better to have via under thermal pad. Yes, you also need the vias to…
gkasprow commented on issue sinara-hw/kirdy#13
sch/pcb reviewAD5680 is NRD Yes, but one of the design goals was to reuse the thermostat ADC (also hard to source) and DAC to minimise software development effort. One can use DAC in…
gkasprow commented on issue sinara-hw/kirdy#13
sch/pcb reviewJust asking what's the requirement. For monitoring it's fine. For stabilisation it may be not sufficient. This reminds me there are some telecom butterfly modules with…