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My MOSFET amplifier designed for music.
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Old 29th November 2012, 02:10 PM   #381
Ian Finch is online now Ian Finch  Australia
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Since you introduced a MOSFET output relay as an option, could you not also delay its switch-on, as with an electromechanical output relay?
(or otherwise disable until the amp. has settled)
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Old 29th November 2012, 05:35 PM   #382
Mooly is offline Mooly  United Kingdom
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My MOSFET amplifier designed for music.
Hi Ian,
Yes that could easily be done. The only reason I didn't push the solid state relay this time was that it introduces another diy aspect to the amp. To keep it simple they need the photovoltaic couplers, to do it without and it becomes more complex such as Pavels' design here,
Output Relays

The solid state relays are linked to in "item 3" on post #1 of this thread.
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Old 1st December 2012, 01:40 PM   #383
alex mm is offline alex mm  Romania
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..... some missing files attached .
Alex.
Attached Files
File Type: pdf PCB BOTTOM B&W.pdf (60.1 KB, 388 views)
File Type: pdf PCB SILK MIRROR.pdf (72.4 KB, 316 views)
File Type: pdf PCB ALL GREY.pdf (104.3 KB, 392 views)

Last edited by alex mm; 1st December 2012 at 01:47 PM.
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Old 1st December 2012, 02:10 PM   #384
Mooly is offline Mooly  United Kingdom
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My MOSFET amplifier designed for music.
Many thanks for those Alex. They look great.
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Old 1st December 2012, 07:53 PM   #385
Preamp is offline Preamp  Germany
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Alex, keep up the great work! You're truly a master!

Here's an example for the feedback takeoff point Mooly mentioned. Maybe you can move the affected components a little?

Best regards,
Lasse
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File Type: png new-1.png (328.9 KB, 816 views)
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Old 4th December 2012, 06:56 AM   #386
gmphadte is offline gmphadte  India
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Last edited by Mooly; 25th November 2012 at 01:08 AM. Reason: Index to relevant areas in the thread.

The post #1 in this thread has been edited recently and is a nice thinking.
I wish this was the case for other enormous length threads.

Gajanan Phadte
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Old 4th December 2012, 10:15 AM   #387
AndrewT is offline AndrewT  Scotland
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post385
R14, the NFB upper leg resistor, can be soldered onto the Ro lead as it comes out of the output rail trace.
That ensures it reads the output voltage.
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Old 4th December 2012, 12:28 PM   #388
Mooly is offline Mooly  United Kingdom
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Quote:
Originally Posted by AndrewT View Post
post385
R14, the NFB upper leg resistor, can be soldered onto the Ro lead as it comes out of the output rail trace.
That ensures it reads the output voltage.
That would be ideal.
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Old 4th December 2012, 12:29 PM   #389
Mooly is offline Mooly  United Kingdom
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My MOSFET amplifier designed for music.
I've done a "sort of simple" universal speaker delay circuit here as I often mention the need... but never show a circuit.

Simple Universal Speaker Delay Using A Triac
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Old 8th December 2012, 12:53 PM   #390
JohnGeneva is offline JohnGeneva  Switzerland
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Hi Guys, I went over Alex PCB design and schematic and R10 looks like inadvertently it was put on signal ground instead of -45v. Was this a mistake?

I made a bom and will upload if others are interested. If so, what value should I put for the feedback resistor as per post 385.

Alex, you willing to review? It would be hard for me to build without pcb as I have never built amp without pcb.

Best to all, John
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