fa6782c21d
Prepare for v1.2
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* 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
7b0e516c1e
v1.2 gerber output
2020-01-12 16:09:39 +01:00
0bf2bfe5f0
generate gerbers fpr V1.2
2020-01-12 16:02:03 +01:00
561c984ba9
Finalize layout and make smaller component value changes
2020-01-12 16:00:29 +01:00
ae4c0afbf9
Improve layout, change color of B.Silk and improve schematic
2020-01-12 14:56:58 +01:00
103550b2da
Layout opamp changes. Remove INA126 and put in 3 standard opamps instead
2020-01-11 20:58:21 +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
f895e84418
fix sym lib table and refill zones
2020-01-04 20:52:22 +01:00
3c9929bcd6
Finalize version v1.0
2020-01-03 21:26:29 +01:00
6806a29e54
Add solder jumpers for connection between Earth and GND
2020-01-03 20:39:53 +01:00
b529535ae8
Schematic: Re-annotate everything
2020-01-03 20:05:39 +01:00
4e5bc3bae7
Schmatic: Improve layout in schematic
2020-01-03 20:04:57 +01:00
ea05b0885b
Add references for components
2020-01-03 18:45:37 +01:00
6546664939
Revert "Schematic: Redo component annotations"
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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
3bba68b615
Improve layout
2020-01-02 00:17:38 +01:00
2c4c15e72b
Replace custom opamp circuit with INA126 instrumentation amp
2020-01-02 00:08:09 +01:00
f415c9b838
Update transformer footprint
2019-12-29 23:40:30 +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
c8e420bd08
Played around
2019-12-25 01:19:01 +01:00
971a1e7c1a
Include light guides for LEDs
2019-12-25 00:36:35 +01:00
34c84c6cf8
Add prozessorkern's Kicad libraries for Light guide for LEDs
2019-12-25 00:21:00 +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
585ef85fab
PCB rework started
2019-10-02 14:12:33 +02:00
93ec69fa19
Fisrt draft. Will be reworked
2019-09-22 18:42:43 +02:00
