DHT Heater Group Buy notes.
Re: DHT Heater Group Buy notes.
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.
Analogue, the lost world that lies between 0 and 1.
- Mike H
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Re: DHT Heater Group Buy notes.
Fascinating.


"Entrenched convictions cannot be changed by facts." – Dick Francis
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- Old Hand
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Re: DHT Heater Group Buy notes.
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
Cheers,
Stephen
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
Cheers,
Stephen
Re: DHT Heater Group Buy notes.
I use these all the time
https://uk.farnell.com/stmicroelectroni ... t=STPS1045
Slightly higher Vf, but don't know if 60mv matters.
https://uk.farnell.com/stmicroelectroni ... t=STPS1045
Slightly higher Vf, but don't know if 60mv matters.
Resistance isn't futile it's V / I.
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- Old Hand
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Re: DHT Heater Group Buy notes.
Thanks Nick. I've gone with these,Nick wrote: ↑Fri Jun 21, 2019 8:45 amI use these all the time
https://uk.farnell.com/stmicroelectroni ... t=STPS1045
Slightly higher Vf, but don't know if 60mv matters.
Re: DHT Heater Group Buy notes.
Yep, Nick's suggestion should be fine 

Analogue, the lost world that lies between 0 and 1.
Re: DHT Heater Group Buy notes.
It looks as though the carbon comp resistors listed in the BOM are now obsolete - I substituted similar of good quality.