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spenceraxani / CosmicWatch-Desktop-Muon-Detector-v2

The CosmicWatch Desktop Muon Detector supplementary material
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HC4050 VDD Question #53

Open abehnke opened 5 years ago

abehnke commented 5 years ago

I noticed that on the schematic - circuit.pdf - pin 1 VDD of the HC4050 is connected to 5V. Is that correct? I would expect that VDD should be connected to 3.3V from the regulator. With 5V for the HC4050, it would appear that the output logic levels from the HC4050 would be too high for the micro sd card. I found a similar circuit "micro sd card breakout board tutorial - Adafruit pdf" that shows 3.3V for pin 1 of the HC4050. Thanks for this fine project.

spenceraxani commented 5 years ago

Hi,

I think you are correct, good catch. It should be 3.3V rather than 5V. I’ve never ran into issues with the SDCard, so I hope it should be fine for now and add it to my list of updates.

Thanks,

Spencer

On Oct 15, 2019, at 6:40 AM, abehnke notifications@github.com wrote:

I noticed that on the schematic - circuit.pdf - pin 1 VDD of the HC4050 is connected to 5V. Is that correct? I would expect that VDD should be connected to 3.3V from the regulator. With 5V for the HC4050, it would appear that the output logic levels from the HC4050 would be too high for the micro sd card. I found a similar circuit "micro sd card breakout board tutorial - Adafruit pdf" that shows 3.3V for pin 1 of the HC4050. Thanks for this fine project.

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