Official M2 schematic

[flocchini]

M2 up and running
Thanks Tea Bag
@0+20V transformer CLC built on Tea Bag PSU
Bias 1.3A per channel; DC offset about 1mV per channel
Initial impression - smooth

 

[Tea-Bag]

flocchini, what kind of binding posts are those?
The wood looks very nice.

 

[flocchini]

From memory the posts are Gaofei.
The wood is ambrosia.

 

[schubert]

Very nice - where are the chokes?

 

[Bones13]

Very nice - where are the chokes?

Looks like you can see one to the back left of the power toroid in the first picture.

 

[flocchini]

As Bones13 noted

Thanks

Bob

 

[schubert]

What type/size are they, and where can you get them? Thanks

 

[flocchini]

from Amazon site

https://www.amazon.com/dp/B0002ZPR10/ref=sr_ph_1?ie=UTF8&qid=1465578490&sr=sr-1&keywords=erse

Best

Bob

 

[schubert]

Great, thanks! These appear a bit less bulky than the ones I used. I'll post pics of my build when I finish it, hopefully next week. Also - where did you get those great heat sinks?

 

[propitious]

ERSE also makes a Super Q inductor in 14 ga. You might have to check their website erseaudio.com

 

[Zen Mod]

boyz

there is a gift for you , logical thing for M2

Iron Pre | Zen Mod Blog

 

[flocchini]

Great, thanks! These appear a bit less bulky than the ones I used. I'll post pics of my build when I finish it, hopefully next week. Also - where did you get those great heat sinks?

I've had those heat sinks for 25 years 😀

 

[WalterW]

boyz

there is a gift for you , logical thing for M2

Iron Pre | Zen Mod Blog

Nice !

 

[nicoch58]

ZN nice trick the pot jacket 😉

 

[Despearce]

Anybody able to help?

I built the M2 using Teabags board but made an error on one and blew a few components. I put the optocoupler in the wrong way round and set fire to R12, R13 and R14. I have spare optocouplers and resistors but after replacing them R13 blew again.

What other components need checking and can I do this with basic equipment (I have a decent multimeter and a transistor checker from ebay)?

 

[Zen Mod]

just replace everything right from xformer ,meaning on resistors and semis

you can leave caps

 

[Despearce]

including transformer?

 

[Zen Mod]

I said - right from the xformer 🙂

ref to schm in #1 , I would replace Q1 ,Q2,Q5,Q6,Q7,D1,D2,D3,R6,R7,R8,R9,R10,R11,R12,R13,R14,P1

now seriously - I would check them and find which part is kaput , but you must suffer , to drew reminder for future , to triple check before powering up
besides that , I can't know precisely what else you done ..... 😉

 

[Despearce]

My first costly mistake, hopefully my last, thanks for the advice.

 

[Zen Mod]

My first costly mistake, hopefully my last....

I'm repeating that every other day ........