912c709c97
Finalize v1.3.1
2021-10-23 19:57:56 +02:00
ba7c416b31
Prepare corrected version
2021-10-03 18:42:27 +02:00
c0f3b502cc
Update PCB a little to contain correct 3d models
2021-01-16 21:59:38 +01:00
d1638154a6
Merge Earth and GND nets
2021-01-07 00:02:41 +01:00
27083b6825
Change capacitor types to higher rated voltage because the bigger input transformer has a very high voltage due to the low load.
2021-01-06 23:40:29 +01:00
e0fe68342c
Add additional VDD monitoring
2020-12-07 00:44:25 +01:00
aeb30f0e8b
Change 5V regulator to cheaper type
2020-12-06 20:18:50 +01:00
3ce57d6c53
Change components
2020-12-06 17:46:38 +01:00
c8b7802314
v1.3 finished preliminary layout
2020-12-05 18:58:28 +01:00
1375a5c914
Reannotate components
2020-11-27 22:26:34 +01:00
c932da7d41
First draft of v1.3 schematic and layout
2020-11-27 22:22:05 +01:00
a0e6691255
Schematic finished for v1.3
2020-11-23 18:05:27 +01:00
13ba733671
Merge branch 'master' into v1.3-dev
2020-11-17 19:08:11 +01:00
07e0ea3191
Change schematic for v1.3
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* Use DCDC buck converter for digital 3V3 supply.
* Add shielding for OPAmp section
* Change frontend amplifier to an instrumentation amplifier design
2020-11-17 18:59:20 +01:00
be3c30d734
Rescue symbol
2020-11-08 19:58:10 +01:00
e6905a50d2
remove onewire Temp sensor
2020-07-05 18:24:38 +02:00
ff81a12896
Make 230V port wider and add eeprom for config
2020-04-14 21:23:59 +02:00
d6eaf980c9
Add current date and revision to schematic
2020-02-18 20:52:50 +01:00
9da3edbf16
Re-enumerate components. This finilizes draft version for V1.2
2020-02-18 20:19:59 +01:00
adf0a2afb9
Improve ESD protection of DIGIO Pins
2020-02-17 20:40:35 +01:00
d894012b73
Re-annotate components
2020-02-05 18:58:36 +01:00
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
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
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
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
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
