Official M2 schematic

[grimberg]

BTW, what do you use to separate the transformers when you stack them
together? I'm may need to do that for a vfet2 build but am unsure what
works well in practice.
Dennis

Each Antek transformer comes with two rubber pads. I used one on the bottom, two in between the transformers and one on the top. I have stacked transformers in my Aleph J and F6 builds without any issues. As you can see in a photo in one of my previous posts, I can rest the amplifier on one of the heat sinks and the transformers remain in place.

 

[Dennis Hui]

Thanks Grimberg. Good to know no magic is required to keep the transformers in
place.

Cheers,
Dennis

 

[Soundhappy]

Received today few resistors for M2 Jfet stage.
They are like the labyrinth inside

 

[ta240]

I've just begun ordering parts for my M2 build. Thank you so much for the design and schematic.

 

[ta240]

Somehow I bookmarked two different BOMs for the M2 boards. Can someone skim through my list and make sure it looks correct for the tea-bag boards?

The IRFP240 and IRFP9240 are coming with the boards and the 2SK170BL and 2SJ74BL are coming from Spencer

An externally hosted image should be here but it was not working when we last tested it.

thanks!

Edit: the R10 and R12 should be quantity 4

 

[syyma]

R6, R7 need more other value to set the DC offset, at least for my built.

 

[ta240]

R6, R7 need more other value to set the DC offset, at least for my built.

Think I'd be safe adding optional 56.2K, 61.9K and 69.8K to the parts list to cover that?

 

[Zen Mod]

R7 usually need to be 56K

 

[ta240]

awesome, thanks!

Next question. On the power supply boards
http://www.diyaudio.com/forums/blogs/tea-bag/923-dual-rail-power-supply-power-amplifier.html

Here is what I have for the parts list for them. I'm planning to mount the LEDs in the front of the case (unless that isn't a good idea) next to a power switch.

An externally hosted image should be here but it was not working when we last tested it.

 

[ta240]

Thanks to everyone for their advise. Buying a few extra resistors with the order is much easier and cheaper than placing order after order for other values.

 

[ta240]

The tea-bag circuit boards just showed up. The pictures do not do those justice, they look great.

 

[zman01]

awesome, thanks!


Here is what I have for the parts list for them. I'm planning to mount the LEDs in the front of the case (unless that isn't a good idea) next to a power switch.

An externally hosted image should be here but it was not working when we last tested it.

ta240,

If you have listed the parts for both rails of the power supply, you will need to increase the following:

- 505-MKS2.1/63/5 - total 8 units required
- 625-FEP30DP-E3 - total 8 units required
- 271-100-RC - total 8 units required

 

[wtl]

ta240,

You will need to insulate the diodes (FEP30DP-E3) if mounting to the case.

 

[ta240]

thanks for the quantity corrections and the tip on the diodes. I've got nylon standoffs and screws on the list and now it makes sense why instead of metal.

 

[zman01]

Good point made by wtl. You will need thermal insulation material between the FEP30DP-E3 and the heat-sink you will be using (can be the case).

 

[ta240]

Good point made by wtl. You will need thermal insulation material between the FEP30DP-E3 and the heat-sink you will be using (can be the case).

So bolt the diodes to the bottom plate with an aluminum oxide pad with thermal grease on it?

 

[zman01]

Something like this should work:

http://www.mouser.com/ProductDetail/Aavid-Thermalloy/43-77-20G/

You will need these insulation pads for the IRFP240/IRFP9240 also.

 

[wtl]

ta240,

I use mica insulators and Wakefield 120 paste.

 

[Full Range]

I used the keratherm pads from the DIY shop
Prior to swapping them out for sealed units I fitted the boards on their own individual heat sinks

 

[ta240]

thanks for the help and pictures.

I'm starting to feel like I'm 7 and Christmas morning is just around the corner.