e60811b49b
add GND points near test points to get good ground connection
2020-02-18 20:37:26 +01:00
9da3edbf16
Re-enumerate components. This finilizes draft version for V1.2
2020-02-18 20:19:59 +01:00
f1897d8342
Improve schematic and corresponding layout
2020-02-16 00:10:01 +01:00
a67ada8ddf
Rework stability compensation of opamp
2020-02-06 21:36:27 +01:00
20780781e9
Replace all MCP6V31U with MCP6V34. It's cheaper.
2020-02-06 19:49:54 +01:00
d894012b73
Re-annotate components
2020-02-05 18:58:36 +01:00
fa6782c21d
Prepare for v1.2
...
* Remove voltage buffer Opamp after TL431PK because it may oscillate
* Replace TL431PK with TL431LI. Stabilized by very large capacitance (> 10uF)
* Add panic passives to differential amplifier in order to avoid oscillaton. Values as they are now should work.
* Remove external ADC. Tests with version v1.1 show that the precision of the STM's ADC is sufficient, (once all oscillations are damped by modifying the circuit)
* Power whole OpAmp circuit with 3.3 volts in order to eliminate the need for the clamping diode at the ADC pin. This diode showed a high reverse current over temperature, which affected the measurement.
2020-02-05 18:30:34 +01:00
ae4c0afbf9
Improve layout, change color of B.Silk and improve schematic
2020-01-12 14:56:58 +01:00
dda1209659
Remove INA126 because it doesn't work in this configuration. Replace by old subtractor circuit
2020-01-11 20:22:02 +01:00
b529535ae8
Schematic: Re-annotate everything
2020-01-03 20:05:39 +01:00
6546664939
Revert "Schematic: Redo component annotations"
...
This reverts commit 458f3d9769
2020-01-03 18:42:32 +01:00
458f3d9769
Schematic: Redo component annotations
2020-01-03 18:38:16 +01:00
cff848f02f
Small fixes and improvements
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* Card detect pin used
* Fix SD card slot
* Improve routing and via placement
2020-01-03 18:34:21 +01:00
2c4c15e72b
Replace custom opamp circuit with INA126 instrumentation amp
2020-01-02 00:08:09 +01:00
0559a624bc
Moved stuff
2019-12-27 21:36:56 +01:00
a307557a41
Improved layout, Add QR code, Add external ADC option for 22 bit ADC
2019-12-26 18:01:55 +01:00
fe646769e7
Schematic beautify and layout improvments, Length matching for SDIO
2019-12-25 19:15:32 +01:00
a698e0b0e5
Add temperature sensor to PCB for compensation calculation.
2019-12-25 00:20:13 +01:00
c211cf659b
Newest changes in schematic and a preliminary complete layout
2019-12-23 22:25:38 +01:00
93ec69fa19
Fisrt draft. Will be reworked
2019-09-22 18:42:43 +02:00
