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Mezmerize B1 Buffer Preamp
Mezmerize B1 Buffer Preamp
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Old 13th February 2020, 03:12 PM   #451
glennjarrett is offline glennjarrett  United Kingdom
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mounted on a 4mm ally sheet with the heat sinks glued .
going for r /set single 10R per side
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Old 13th February 2020, 05:42 PM   #452
Junebugvinyl is offline Junebugvinyl  United States
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Very nice! What did you use for the rectifier diodes?

Also, though I haven't mounted my irfp9240's yet, I have assumed until seeing your photo that they would be mounted the opposite way given the drawing on the PCB. Glad I saw your photo!
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Old 13th February 2020, 07:38 PM   #453
Salas is offline Salas  Greece
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Mezmerize B1 Buffer Preamp
Quote:
Originally Posted by freebee View Post
Maybe it's the photo, however one of the irfp9240's could perhaps do with a bit more solder? (bottom left, middle pin)
Indeed. Maybe there is a fillet underside though. But he better touch it up with a bit of solder on the top side too.
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Old 14th February 2020, 09:28 AM   #454
glennjarrett is offline glennjarrett  United Kingdom
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I lost that pad moving the irfp's from top to bottom but the underside is good
BYW29E-200 diodes i think
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Old 2nd March 2020, 11:05 AM   #455
glennjarrett is offline glennjarrett  United Kingdom
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Just removed the 2x 68r per side (34R)
and replaced with 1x 10R per side
was getting 2.042v & 1.957v across the 2x 68R per side but only getting 1.739v & 1.628v with the 10R resistors is this ok as i was expecting more voltage with the 10R per side
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Old 2nd March 2020, 01:22 PM   #456
Salas is offline Salas  Greece
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Mezmerize B1 Buffer Preamp
Its counter-intuitive but its right. Has to do with increased VGS (due to more current) reaching nearer to the three LEDS combined VF. That VF-VGS difference is what you measure across the setting resistor. Despite ~0.3V Vref loss you went from 60mA to 163-174mA now.
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Old 4th March 2020, 02:28 PM   #457
glennjarrett is offline glennjarrett  United Kingdom
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seeing i have adequate cooling should i lower the resistors to 3R for more mA or would there be no improvement
i also only have a 50va 2 x 15v transformer
regards Glenn
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Old 4th March 2020, 03:59 PM   #458
Salas is offline Salas  Greece
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Mezmerize B1 Buffer Preamp
Most builders were historically happy enough where you now stand as it was discernibly better than with 60mA when further on it just gets gradually better. That was with bigger transformer and Hypnotize single input version which had more reservoirs. With your transformer and a Mezmerize try down to 5 Ohm I would say and judge for yourself. Piggy back another 10 Ohm on each Rset is the easy way. Monitor your rectifier diodes temperature also.
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Old 5th March 2020, 04:39 AM   #459
LATB is offline LATB  United States
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Hi -- I'm also building the Mez B1, and just got to listen to music through it for the first time today! Beautiful.

Here's a quick picture of where I got today. As you can see, there's space for an internal DAC streamer which will go in there next, as soon as I get the PSU boards from Teabag. I'll post more/better pictures when I'm done.

I could not have gotten this far without this forum and all your advice, so thank you all for that, and thank you to Salas for designing this beautiful piece.
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Old 5th March 2020, 06:35 AM   #460
Salas is offline Salas  Greece
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Mezmerize B1 Buffer Preamp
Very nice. Congratulations. What other gear completes your audio system?
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