pcb/reflow-oven-control-pcb
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fa6782c21d
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14 Commits

Author SHA1 Message Date
Mario Hüttel
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
Mario Hüttel
ae4c0afbf9 Improve layout, change color of B.Silk and improve schematic 2020-01-12 14:56:58 +01:00
Mario Hüttel
dda1209659 Remove INA126 because it doesn't work in this configuration. Replace by old subtractor circuit 2020-01-11 20:22:02 +01:00
Mario Hüttel
b529535ae8 Schematic: Re-annotate everything 2020-01-03 20:05:39 +01:00
Mario Hüttel
6546664939 Revert "Schematic: Redo component annotations" 
This reverts commit 458f3d9769.

* Changing annotations and propagating the changes to the board are not possible anymore
 2020-01-03 18:42:32 +01:00
Mario Hüttel
458f3d9769 Schematic: Redo component annotations 2020-01-03 18:38:16 +01:00
Mario Hüttel
cff848f02f Small fixes and improvements 
* Card detect pin used
* Fix SD card slot
* Improve routing and via placement
 2020-01-03 18:34:21 +01:00
Mario Hüttel
2c4c15e72b Replace custom opamp circuit with INA126 instrumentation amp 2020-01-02 00:08:09 +01:00
Mario Hüttel
0559a624bc Moved stuff 2019-12-27 21:36:56 +01:00
Mario Hüttel
a307557a41 Improved layout, Add QR code, Add external ADC option for 22 bit ADC 2019-12-26 18:01:55 +01:00
Mario Hüttel
fe646769e7 Schematic beautify and layout improvments, Length matching for SDIO 2019-12-25 19:15:32 +01:00
Mario Hüttel
a698e0b0e5 Add temperature sensor to PCB for compensation calculation. 2019-12-25 00:20:13 +01:00
Mario Hüttel
c211cf659b Newest changes in schematic and a preliminary complete layout 2019-12-23 22:25:38 +01:00
Mario Hüttel
93ec69fa19 Fisrt draft. Will be reworked 2019-09-22 18:42:43 +02:00