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Official M2 schematic
Official M2 schematic
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Old 25th October 2015, 11:44 AM   #21
Zen Mod is offline Zen Mod  Serbia
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Official M2 schematic
I drew that , just to emphasize that diode and transistor are within same part - 4N35 , which is optocoupler

Papa stumbled on using them in Yore Treshold days

Clever Chap , he is ....... using optocouplers when I was still in Spielhosen ....
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Old 25th October 2015, 12:10 PM   #22
wdecho is offline wdecho  United States
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Official M2 schematic
I do hope someone designs boards and the store decides to stock them. I have been intrigued by the M2 being a horn speaker owner. I would like to place the M2 boards inside one of my 2 complete Firstwatt clone amps. I will keep the F6 the one I am currently enjoying.
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Old 25th October 2015, 12:14 PM   #23
Danger Mouse is offline Danger Mouse  Germany
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Christmas is a Little bit earlyer this year

Thank you Mr. Pass
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Old 25th October 2015, 12:22 PM   #24
Zen Mod is offline Zen Mod  Serbia
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after several years of having that schematic , also having amp in my living room , I'm still flabbergasted

I remember , from dusty papers , amps similar in both simplicity and execution

however , uniqueness of this one is fact that is brought in this era , both in spite and due to modern era parts and habits of how to use them

you'll hardly find both simpler (or even "just" equally simple) and more capable of doing what is made for

True Papa's Koan , isn't it .
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Old 25th October 2015, 01:13 PM   #25
Dennis Hui is online now Dennis Hui  Canada
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Official M2 schematic
I've used one on and off for about 18 months. I can only compare it to
a diy Aleph 30 and I find the M2 more lively. Very enjoyable.

Thank you Papa for making this available.

Dennis
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Old 25th October 2015, 01:35 PM   #26
wdecho is offline wdecho  United States
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Official M2 schematic
I have tried to find the Edcor PC600/15K transformer with no luck. I can only guess it was made specifically for Firstwatt. What transformer did you use Zen Mod?
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Old 25th October 2015, 01:53 PM   #27
2 picoDumbs is offline 2 picoDumbs  Australia
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Quote:
Originally Posted by wdecho View Post
I have tried to find the Edcor PC600/15K transformer with no luck. I can only guess it was made specifically for Firstwatt. What transformer did you use Zen Mod?
Just use a Jensen with the right turn ratio.
I think voltage gain of amp is around 6
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Old 25th October 2015, 02:02 PM   #28
Zen Mod is offline Zen Mod  Serbia
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it is on Edcor site , PC series
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Old 25th October 2015, 02:31 PM   #29
wdecho is offline wdecho  United States
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After much head scratching on my part this is the transformer I came up with. You will have to change the type in the box to 600 ohm to 15 K ohm.

https://www.edcorusa.com/pc_series

Last edited by wdecho; 25th October 2015 at 02:34 PM.
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Old 25th October 2015, 02:43 PM   #30
Zen Mod is offline Zen Mod  Serbia
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et voila!

expensive , though

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