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Old 29th November 2017, 06:56 AM   #4121
FX200 is offline FX200  Germany
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My first step into the world of Nelson Pass amplifiers.

I made my own PCB with F5, capacitors, rectifiers and fuses. All in one.
The last days I built up and switched on. I am very impressed with the quality of the F5.

My first pass amplifier, but certainly not my last one.

Next comes the case.

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Old 29th November 2017, 07:00 AM   #4122
Zen Mod is offline Zen Mod  Serbia
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Pictures of your diy Pass amplifier
very nice

even if positioning of mosfets on heatsink isn't optimal , I believe it's not so important , due to increased heatspreader/heatsink size
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Old 29th November 2017, 07:09 AM   #4123
JANKAR is offline JANKAR  Finland
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Default F5

I have same idea on my F5 pcb, bought from Passclone.
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Old 29th November 2017, 07:13 AM   #4124
fdlsys is offline fdlsys  South Africa
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Wow! Meticulous work and top notch photography!

I agree about less then ideal placement of FETs but I don't think you'll have a problem there. You might have a problem with bridge rectifiers. In my (stereo) F5s they are the 2nd hottest component (after the inrush NTC) and I have them mounted on a separate heatsink.
However, you built mono-blocks so your rectifiers pass only 1/2 of total current - maybe you can get away with it without the heatsinks. I would consider them in any case, at least to pull the heat away from the PCB.

Beautiful work, keep it going!
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Old 29th November 2017, 11:55 AM   #4125
labjr is offline labjr  United States
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What are the film capacitors for?
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Old 1st December 2017, 08:16 AM   #4126
FX200 is offline FX200  Germany
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It's no big deal about the Mosfets. The Mosfets can also be mounted vertically on the PCB. And then mount the PCB crosswise to the heat sink.
I had this big used heatsink, it works so well. I have about. 42... 43C Heatsink temperature.


The rectifiers remain under the data sheet specifications, but it is also possible to mount them under the PCB and place them directly on the heat sink. Of course, cooler is always better.


@labjr:
The red Wima capacitors are parallel to the large capacitors. The one in the middle is for the line in - that's optional, I don't know typical for a pass amplifier. On the one hand I don't know if my preamplifier is DC free, on the other hand I wanted to provide the space on the board, a wire jumper can always be set.

Thank you for the positive answers.
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Old 2nd December 2017, 06:02 PM   #4127
mpmarino is offline mpmarino  United States
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Nice boards!!

( IRFP9240!? )
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Old 3rd December 2017, 01:29 AM   #4128
mrspis is offline mrspis
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Pass Labs Aleph 5 clone, Pass Labs preamp p1.7 clone with attenuator separate transformers for each channel and signal, and 192bit/24khz dac all diy paired with JBL L90 with upgraded crossovers cables audioquestmidnight also high end pioneer S-W1EX subwoofer. The first picture is of the upgraded crossover I'm searching for a picture of original to compare so if somebody has JBL L90 and is willing to open the woofer and take a picture i would be very grateful also planning to make a diy dd66000 with drivers from 4435 cheers

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jbl l90 with aleph and upgraded marantz cd40 upgrade includes lamps acoustically treated room all walls covered with plush curtains and carpets on the floor 2:35 perfect sound too bad the camera was bad quality audio recording and almost none bass phone samsung s3

Last edited by mrspis; 3rd December 2017 at 01:52 AM.
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Old 5th December 2017, 12:50 AM   #4129
mpmarino is offline mpmarino  United States
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Default another Aleph 5 coming up

Another Aleph 5 coming up - definitely next year at this rate.

Why an Aleph 5? Why such an old hunk of crap ?

Until I try the M2, I contend Alephs are the best to my ears on my Klipshchhe Fortes and Fortes are the best to my ears in a long time.

edit: and these things have no business sounding so good, using the same devices you'd probably find in an elevator motor controller or something.

I'm gutting my KSA Klone chassis. It just won't do.

Made some roomy boards.
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Last edited by mpmarino; 5th December 2017 at 01:10 AM.
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Old 5th December 2017, 12:43 PM   #4130
JeffYoung is offline JeffYoung  Ireland
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Pictures of your diy Pass amplifier
Nice looking boards, @mpmarino.
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