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Old 8th June 2018, 05:32 PM   #301
Nelson Pass is offline Nelson Pass  United States
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The diyAudio First Watt M2x
There is not yet a definitive pin designation.

I figure that the dual inline connector will use two adjacent pins for
each connection by way of redundancy, so 20 pins = 10 connections,
26 pins = 13 connections.

26 pins is the other common value, especially since it is popular with
current computer parallel cables.

Let's assume the amp uses an output follower stage and further
assume that the bias circuit is on the output stage board:

At a minimum the interface needs to address V+, V-, Gnd, +Input and
+Drive. That's five.

Also, how about -Input, -Drive, +Speaker, -Speaker.

That makes nine.

Other possibilities are Aux Gnd, Output current Sense,
Aux V+, Aux V-.

That makes 13.

What alternative or additional connections do you think you might want?

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Old 8th June 2018, 10:29 PM   #302
gwrskien is offline gwrskien  Norway
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Can you use one of these? Mouser 517-4832-6004-CP or 517-4828-3004-CP . 32 or 28 pins. 26 pin gives 1 option at Mouser, 28 pins gives 92 options and 32 pins gives 42..
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Old 9th June 2018, 06:49 AM   #303
Juntuin is offline Juntuin  Finland
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Is this right transformer?

EDCOR - PC Series
and there 600ohm to 15kohm (1:5 ratio)?
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Old 9th June 2018, 09:47 AM   #304
coolnose is offline coolnose  Europe
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Yes, thats the right one.
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Old 10th June 2018, 04:12 PM   #305
coolnose is offline coolnose  Europe
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I had to read up on "lagniappe"
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Old 12th June 2018, 08:48 PM   #306
stablgr is offline stablgr
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Quote:
Originally Posted by 6L6 View Post
For those who missed out on the pre-production PCB, don't worry! PCB sets will be available in the diyAudio store in the near future.


Just when I got all the parts I need for building an F5.... it's time to start shopping again!


Can't wait for the boards to appear in the shop, but at least I have the Whammy in progress to keep me busy until they arrive.


Please, please, please don't make me wait too long though!
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Old 14th June 2018, 11:14 PM   #307
Mark Johnson is offline Mark Johnson  United States
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Default June M2x orders were shipped today

Today I shipped all M2x boardsets that were
ordered in June; buyers please check your
Private Messages to find the Customs Number
or the domestic Tracking Number.

Thanks to everyone!
Mark Johnson
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Old 15th June 2018, 11:09 AM   #308
Mixi is offline Mixi  Europe
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I've been following this thread with great interest and (as soon as the boards are available) I think this might well be the next project for me.

I do have a few questions: This would be my first Pass Amp. Would the M2 be a good place to start this journey? Better than an F6 or F5 maybe?

I'm looking for a design that is rather beginner friendly and doesn't take a lot of tweaking or tuning to get it right.

This might seem odd, but it's important for me: is it quiet? Is there any noise floor to be expected or any hum / buzz issues? I know it's a bit odd but it drives me crazy if there's noise from the speakers when the music is off.

Thanks!
Michi
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Old 15th June 2018, 03:52 PM   #309
MEPER is offline MEPER  Denmark
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My experience with amplifiers is that it is up to the "builder" to get the amp quiet. If you take care of PSU, wiring etc. you can get all amps "dead quiet". I just built the ACA and it is "dead quiet". Before that I had a project with making a tube amp silent. I used some of the same philosophy when building the ACA and it worked. You need to make a plan for how you place components, short wiring for input, signal ground, PSU ground, low ripple, magnetic stray fields etc. etc...….
ACA is probably the best "beginner amp".....it was made for that purpose as I understand it......and it sounds good! …..there is also a PSU for it if you don't want to built one yourself.
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Old 15th June 2018, 04:17 PM   #310
Juntuin is offline Juntuin  Finland
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Quote:
Originally Posted by MEPER View Post
My experience with amplifiers is that it is up to the "builder" to get the amp quiet. If you take care of PSU, wiring etc. you can get all amps "dead quiet". I just built the ACA and it is "dead quiet". Before that I had a project with making a tube amp silent. I used some of the same philosophy when building the ACA and it worked. You need to make a plan for how you place components, short wiring for input, signal ground, PSU ground, low ripple, magnetic stray fields etc. etc...….
ACA is probably the best "beginner amp".....it was made for that purpose as I understand it......and it sounds good! …..there is also a PSU for it if you don't want to built one yourself.
I'm interested how sensitive speakers you have? I have build some amps as well, they have been dead quiet also..usually after some troubleshooting . But when you connect them to 106db sensitive horns, things might turn out different
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