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Old 12th March 2013, 07:51 AM   #431
syklab is online now syklab  Hong Kong
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Quote:
Originally Posted by KlipschKid View Post
Otto 2 looks like the same thing (which IC ?) so I'd use that if you have it.
Click the image to open in full size.
http://www.fairchildsemi.com/ds/FS/FST3257.pdf

Last edited by syklab; 12th March 2013 at 08:12 AM.
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Old 12th March 2013, 08:22 AM   #432
DQ828 is offline DQ828  Australia
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Originally Posted by syklab View Post
What are the things above & below the IC chip? In the R1, R2 & R3 locations, my Otto doesn't have anything in those locations just holes

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Old 12th March 2013, 08:29 AM   #433
qusp is offline qusp  Australia
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resistor networks, massive PTH resistor networks
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Old 12th March 2013, 09:17 AM   #434
DQ828 is offline DQ828  Australia
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Originally Posted by qusp View Post
resistor networks, massive PTH resistor networks
What do they do?

It so happens I may have fried the IC chip on my OTTO, the picture & my chip says it is FST3257G, but that chip, with the "G" on the end, is not listed in the data sheet or at Digi key or Mouser, I assue I should buy the FST3257M? to see if I can replace the otto chip, can anyone confirm I have this right?

Actually it'll have to be the MX

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Old 12th March 2013, 09:40 AM   #435
syklab is online now syklab  Hong Kong
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Originally Posted by DQ828 View Post
What do they do?

It so happens I may have fried the IC chip on my OTTO, the picture & my chip says it is FST3257G, but that chip, with the "G" on the end, is not listed in the data sheet or at Digi key or Mouser, I assue I should buy the FST3257M? to see if I can replace the otto chip, can anyone confirm I have this right?

Actually it'll have to be the MX
FST3257G datasheet and application note, data sheet, circuit, pdf, cross reference | Datasheet Archive
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Old 14th March 2013, 03:44 PM   #436
Eric06 is offline Eric06  France
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Quote:
Originally Posted by DQ828 View Post
What do they do?

It so happens I may have fried the IC chip on my OTTO, the picture & my chip says it is FST3257G, but that chip, with the "G" on the end, is not listed in the data sheet or at Digi key or Mouser, I assue I should buy the FST3257M? to see if I can replace the otto chip, can anyone confirm I have this right?

Actually it'll have to be the MX
I haven't checked all the characteristics but I assumed OnSemi and Fairchild FST3257 devices are indeed fully compatible/exchangeable.
FYI: in the Onsemi part datasheet, the symbo for the SOIC16 is "FST3257G".
(Mouser p/n: 863-74FST3257DR2G).
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Old 14th March 2013, 03:51 PM   #437
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What do they do?
Introducing OTTO2
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Old 14th March 2013, 03:52 PM   #438
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Originally Posted by Eric06 View Post
I haven't checked all the characteristics but I assumed OnSemi and Fairchild FST3257 devices are indeed fully compatible/exchangeable.
FYI: in the Onsemi part datasheet, the symbo for the SOIC16 is "FST3257G".
(Mouser p/n: 863-74FST3257DR2G).
They are functionally equivalent.
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Old 14th March 2013, 04:13 PM   #439
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btw Brian why did you use large ones, easier soldering for the DIYer? because mostly the small SMD ones are leadless and easy to screw up without hot-air or reflow?
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Old 14th March 2013, 04:58 PM   #440
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btw Brian why did you use large ones, easier soldering for the DIYer? because mostly the small SMD ones are leadless and easy to screw up without hot-air or reflow?
Easier soldering for me, actually. I pre-mount the chips, and didn't want to have to get a stencil and deal with micro-alignment. Still pretty small when it's the only chip on the board.
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