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Small typos

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Nis Wechselberg 2018-06-29 00:37:16 +02:00
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content/posts/2018-06-25-Saike-858D-Measurements.md
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@ -33,7 +33,7 @@ This means the transformer produces a voltage a bit higher than rated.
![10V Rail With Fan Running](/posts/images/858D/10VAC_Fan_Running.png) ![10V Rail With Fan Running](/posts/images/858D/10VAC_Fan_Running.png)
If the fan is running, the 10V rail degrades a bit more and slightly drops in voltage. If the fan is running, the 10V rail degrades a bit more and slightly drops in voltage.
Again, given the fact that it it fed through a rectifier and then a voltage regulator, that is almost fine. Again, given the fact that it is fed through a rectifier and then a voltage regulator, that is almost fine.
I don't really like that we use a voltage of about 12V as the input for the 7805 voltage regulator. We power the microcontroller, the display, the EEPROM and a bit of other stuff from the regulator so I would guess the current is not too high, probably in the few hundreds of mA. I don't really like that we use a voltage of about 12V as the input for the 7805 voltage regulator. We power the microcontroller, the display, the EEPROM and a bit of other stuff from the regulator so I would guess the current is not too high, probably in the few hundreds of mA.
@ -60,7 +60,7 @@ At the maximal position, the voltage rises to 28.2 volts, more than 4 volts over
I am not really happy with the transformer in the device. The rating is dodgy at best, and lots of energy is wasted in heat in regulation circuits. I am not really happy with the transformer in the device. The rating is dodgy at best, and lots of energy is wasted in heat in regulation circuits.
At the moment I tend towards replacing the transformer with a 24 volts switching power supply and a small buck converter for the 5 volts logic circuts. The fan regulation could then be done through simple PWM. At the moment I tend towards replacing the transformer with a 24 volts switching power supply and a small buck converter for the 5 volts logic supply. The fan regulation could then be done through simple PWM.
[1]: {{<relref "2018-06-20-Reverse-Engineer-a-Saike-858D.md">}} [1]: {{<relref "2018-06-20-Reverse-Engineer-a-Saike-858D.md">}}