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Official M2 schematic
Official M2 schematic
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Old 15th May 2018, 07:43 AM   #2641
kbergsson is offline kbergsson  Iceland
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Or bend slightly, if its only a couple of mm.
Mpmarino, In the Norwegian Oil business they use the term "sledge mechanic" for those that dont posess the finer mechanical skills.
In Iceland the approach used to be different as the skills where there but availability of parts was poor so you fixed things with what you had In the late 70s i ordered a set of parts for a 66' Oldsmobile my father gave me. 3 years later I got only one part and it was the wrong termostat

Last edited by kbergsson; 15th May 2018 at 07:55 AM.
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Old 18th May 2018, 06:29 PM   #2642
kbergsson is offline kbergsson  Iceland
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Got the Edcors today. They are the wrong ones ie 15k:600.
As the pins are of soft metal I tryed bending them so I can mount them rotated 180deg in the PCB. Seems ok. No I just need to wait for the PCBs
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Old 18th May 2018, 07:43 PM   #2643
Zen Mod is offline Zen Mod  Serbia
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Official M2 schematic
swell!
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Old 18th May 2018, 09:29 PM   #2644
zman01 is online now zman01  Bangladesh
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Official M2 schematic
Quote:
Originally Posted by kbergsson View Post
Got the Edcors today. They are the wrong ones ie 15k:600.
As the pins are of soft metal I tryed bending them so I can mount them rotated 180deg in the PCB. Seems ok. No I just need to wait for the PCBs
Well, the parts are coming in... good luck with your build kbergsson! And keep us posted.
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Old 19th May 2018, 09:26 AM   #2645
kbergsson is offline kbergsson  Iceland
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Thanks zman01, I will
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Old 20th May 2018, 02:21 AM   #2646
mpmarino is offline mpmarino  United States
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Quote:
Originally Posted by kbergsson View Post
Got the Edcors today. They are the wrong ones ie 15k:600.
As the pins are of soft metal I tryed bending them so I can mount them rotated 180deg in the PCB. Seems ok. ........

Excellent! So you only needed a chisel

Don't feel bad. I ordered the wrong ones as well. Fortunately i think better while I'm asleep - woke up in a cold sweat and immediately sent an email asking for a change

Looking forward to hearing my M2 when it's done. Assuming it works at all
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Old 20th May 2018, 08:14 AM   #2647
kbergsson is offline kbergsson  Iceland
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Originally Posted by mpmarino View Post
Excellent! So you only needed a chisel

Don't feel bad. I ordered the wrong ones as well. Fortunately i think better while I'm asleep - woke up in a cold sweat and immediately sent an email asking for a change

Looking forward to hearing my M2 when it's done. Assuming it works at all
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Old 22nd May 2018, 01:34 AM   #2648
mpmarino is offline mpmarino  United States
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Default I'm a screw up :)

Went to power the M2 up.

I totally messed it up. Never went back to check the board layout in relation to components. Used a footprint for the p-Mos with swapped source and drain AND used the wrong pin-out for the LM385 - DOH!

Serves me right for rushing. Did a swaperoony on the bottom of the board for the P -IRFPs and my LM385s now look like they are doing the twist

Now she biases up beautifully! What an elegant design - bias is so accurate and consistent.

Uses a 'universal' +/- 24V external PSU. It's still out in the shop, haven't heard it, nor done the finishing touches yet. Attached is a crappy pic (crappiness is intentional). Any similarities to a Big Boy Pass amp are purely intended
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Old 22nd May 2018, 02:09 AM   #2649
zman01 is online now zman01  Bangladesh
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mpmarino,

Good to know that you have your M2 clone powered up. You need to give it a listen! I think you'll be delighted.

One question - are those custom PCBs?

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Old 22nd May 2018, 03:02 AM   #2650
mpmarino is offline mpmarino  United States
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All in due time - actually, I'm a bit worried there are more mistakes

Yes, the PCBs are unique and home etched.
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