DHT Heater Group Buy notes.

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Andrew
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Re: DHT Heater Group Buy notes.

Post by Andrew » Mon Jun 17, 2019 11:30 am

I should add that I have not had any reports of the non-epoxy cap breaking on the PCBs in the field. Doesn't mean it hasn't happended but I've not heard about it....if it has.
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Mike H
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Re: DHT Heater Group Buy notes.

Post by Mike H » Mon Jun 17, 2019 12:09 pm

Fascinating.

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izzy wizzy
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Re: DHT Heater Group Buy notes.

Post by izzy wizzy » Fri Jun 21, 2019 8:29 am

The diodes DSB10I45PM are hard to get or on long back order from Farnell
https://uk.farnell.com/ixys-semiconduct ... w%2Fsearch.

I found these
https://uk.farnell.com/stmicroelectroni ... dp/2325859

I know they're duals so I figured I could use 3; the common cathode being used for the positive leg of the bridge and use them as singles for the negative leg. I thought they were close in spec to the originals if I'm looking at the right things; a low Vf fer instance.

These are a small signal schottky like the originals. What is the difference between a small signal schottky and a schottky rectifier?

If these were OK, they have a low Vf and I'm using only 5VAC in for 2.1V out to 4P1L
https://uk.farnell.com/stmicroelectroni ... dp/9803360

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Nick
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Re: DHT Heater Group Buy notes.

Post by Nick » Fri Jun 21, 2019 8:45 am

I use these all the time

https://uk.farnell.com/stmicroelectroni ... t=STPS1045

Slightly higher Vf, but don't know if 60mv matters.
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izzy wizzy
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Re: DHT Heater Group Buy notes.

Post by izzy wizzy » Fri Jun 21, 2019 9:33 am

Nick wrote:
Fri Jun 21, 2019 8:45 am
I use these all the time
https://uk.farnell.com/stmicroelectroni ... t=STPS1045
Slightly higher Vf, but don't know if 60mv matters.
Thanks Nick. I've gone with these,

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Re: DHT Heater Group Buy notes.

Post by Andrew » Fri Jun 21, 2019 11:44 am

Yep, Nick's suggestion should be fine :)
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Ray P
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Re: DHT Heater Group Buy notes.

Post by Ray P » Sun Dec 27, 2020 9:10 pm

Andrew wrote:
Tue Jan 12, 2016 12:11 pm
The parts that that are best not substituted include the 470nF surface mount caps and the carbon comp resistors, please get the exact ones listed in the BOM.

It looks as though the carbon comp resistors listed in the BOM are now obsolete - I substituted similar of good quality.

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