You are right. Not good to have unsmoothed rectifier outputs mixed with clean GND (after CLC) and to keep the wires from / to the rectifiers short. The stupid wiring caused nasty current flows also I guess.
Instead of 8 big capacitors I have used many many many small (ø18mm) caps. This allowed me to put 2 big DC chokes, transformer and power supply in a only 300 mm deep chassis. But I must admit after assembling the M2 the supply looked a bit oversized, but it will not harm.😀
@JohnnyCanuck,
my midclass dmm says 0,0mV AC arrive at the amp-pcbs
good enough for me
even the 1mV AC at output doesn't do anything to my ears
best amp i have ever build
not yet mentioning the sound...!!!
cheers
A.
my midclass dmm says 0,0mV AC arrive at the amp-pcbs
good enough for me
even the 1mV AC at output doesn't do anything to my ears
best amp i have ever build
not yet mentioning the sound...!!!
cheers
A.
@Attila I,
Thanks for measuring - that is an excellent result.
With luck perhaps I can do as well.
-K-
Thanks for measuring - that is an excellent result.
With luck perhaps I can do as well.
-K-
I built a M2 used Teabag's boards, the Edcor trannies, the standard diyaudio store chassis, and the standard power supply using the store boards. I followed instructions and did NOT have to shield the transformers. I love this amp and it's been my main amp in my setup for over a year now. Quiet as a mouse on my >100dB horns. I have parts to build a second M2.
In fact, while on this topic, I will say that I preferred this amp to an F6 I also built and a Pass built J2.
Jim
Last edited:
Thanks for the pics, 1543.
I like that you mounted the rectifiers to the faceplate. Good idea. 😀
.
I like that you mounted the rectifiers to the faceplate. Good idea. 😀
.
First rate.
Many thanks for your kind feedback.
Yes, the transformer is a Toroidy TTSAS0400 400VA 2x18V. They are of very good quality, highly recommended.
The mounting of rectifiers to faceplate helps a lot when space on baseplate is limited. Also access is much easier when mounting the recifiers on the faceplate.
I have shielded the edcors with Teko 3710.16 enclosures. It is easy to make them fit to teabags M2 clone boards with solder tails which can be screwed to the board.
Attachments
Wow thats impressive! Some nice details there, I also like the rectifiers mounted on the faceplate. What l bracket did you use for the transformer?
Many thanks for your kind feedback.
Yes, the transformer is a Toroidy TTSAS0400 400VA 2x18V. They are of very good quality, highly recommended.
The mounting of rectifiers to faceplate helps a lot when space on baseplate is limited. Also access is much easier when mounting the recifiers on the faceplate.
I have shielded the edcors with Teko 3710.16 enclosures. It is easy to make them fit to teabags M2 clone boards with solder tails which can be screwed to the board.
Yes I really like their transformers. I used a 2x20, 300VA in a recent build but didn’t realize I’d have to mount it vertically to fit the chassis. I had a friend weld L brackets to the mounting plate so was curious how much extra space the 400VA would take for future builds.
1543, nicely done!
That pretty transformer shield could start a fad! So... 117,500uF + 220,000uF PER RAIL in psu filter capacitance, is that right? It sure looks cool. May I ask what inductance you're using in there?
That pretty transformer shield could start a fad! So... 117,500uF + 220,000uF PER RAIL in psu filter capacitance, is that right? It sure looks cool. May I ask what inductance you're using in there?
Just finished my second M2 build. This time with higher class current using two pairs of output mosfets. Up power transformer to 1KVA and power supply capacitance to 176,000uF / channel. Overall saw an improvement in low end and immersive sound stage.
Attachments
Who is the manufacturer of the yellow colored 600:20K transformers, in photo 4 of post #2697? Does their sonic character duplicate that of the Edcor 600:15K transformers in the original M2?
