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A guide to building the Pass F4 amplifier.
A guide to building the Pass F4 amplifier.
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Old 2nd December 2019, 04:09 PM   #1591
ItsAllInMyHead is online now ItsAllInMyHead  United States
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@Belmondo - Follow the advice provided. I made the error of ordering a close, but not quite part. TLV431ILPR... This wonderful community helped me realize and correct the error of my ways after my MOSFETs wouldn't kick in. Low Voltage version ... nope... nope... nope. Oops
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Old 2nd December 2019, 04:34 PM   #1592
Zen Mod is online now Zen Mod  Serbia
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A guide to building the Pass F4 amplifier.
well , in your case prefix was culprit, not suffix
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Old 2nd December 2019, 05:34 PM   #1593
Belmondo is offline Belmondo
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Thanks again for all the advice, much appreciated, especially by ItsAllInMyHead. I did read about you prefix problem which is why I started paying attention to the types of TL-431. 6L6ís recommended part is now in my BOM

Iím now at the last hurdle with my BOM. Trim-pots. Bourns has different pin configuration - straight and offset - all have 3 pins but there are 4 holes on the pcb for the trim pots. Little things like this completely throw a beginner!

Are there 4 holes so I can use trim pots with either the 3 pins in-line or those with the pins off-set? I donít want to buy the wrong ones as they are relatively expensive and then thereís the carriage cost on top for a re-order if I'm wrong! Iím looking to buy this: 3296W-1-502LF Bourns | Mouser Российская Федерация
and the 500 ohm version. Thanks again for your help. Iíd be lost and pulling out whatís left of my hair without it!
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Old 2nd December 2019, 05:37 PM   #1594
Shawnstium is offline Shawnstium  United States
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The extra hole is to allow the use of both in-line and off-set pin trim pots.
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Old 2nd December 2019, 05:44 PM   #1595
Belmondo is offline Belmondo
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Thanks Shawnstium
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Old 2nd December 2019, 06:55 PM   #1596
ItsAllInMyHead is online now ItsAllInMyHead  United States
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@belmondo - if you're so inclined. If I had it to do over again, I'd have put in the pots with the adjustment on the side. I can't remember if the F4 boards have both in-line and Y configuration, but something like this makes it so much easier to adjust the bias and offset. I couldn't find the exact part I was looking for, but someone with better Mouser-Fu skills may be able to jump in with the exact part number for both pots.

Screen Shot 2019-12-02 at 12.44.58 PM.png
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Old 2nd December 2019, 07:00 PM   #1597
Zen Mod is online now Zen Mod  Serbia
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A guide to building the Pass F4 amplifier.
boyz

use tweezers , if pins are different than holes line-up

I would do it even for medical instruments, I did it zillion times repairing money-making gadgets ......

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Old 2nd December 2019, 07:20 PM   #1598
Blk Dynamite is offline Blk Dynamite  United States
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I need to build this one. Think ill give my dad my M2x and build this for myself
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Old 2nd December 2019, 08:39 PM   #1599
Belmondo is offline Belmondo
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@ItsAllInMyHead: I've found a top adjusting trim pot on Mouser(Bourns call it vertical adjusting) and the Y-version is available so that's what I'll go for as long as the values are available.
Thanks again.
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Old 2nd December 2019, 09:15 PM   #1600
Belmondo is offline Belmondo
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@ItsAllInMyHead:Here are the Mouser part numbers should you fancy a change

652-3296Y-1-502LF
652-3296Y-1-501LF
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