Google triple point of water, even at home you can get better than .1C with a little care. It is considered the reference standard for thermometry and NIST has instructions for getting .001C. We did all this to qualify AD590's for the space shuttle. Review the history of the heat shield on the shuttle and you will get a harsh lesson on the value of obsessive measurement.
T4A on a 220Vac mains supply allows a 900VA transformer to be used. What size of transformer did you buy?
Spec was 2x 600VA.
Gnd connection depends on you total system.
But you can take a look at this :
Earthing (Grounding) Your Hi-Fi - Tricks and Techniques
And of course the article from Bruno.
The G word: How to get your audio off the ground | EDN
(Read the entire article consisting of multiple parts.)
Patrick
Gnd connection depends on you total system.
But you can take a look at this :
Earthing (Grounding) Your Hi-Fi - Tricks and Techniques
And of course the article from Bruno.
The G word: How to get your audio off the ground | EDN
(Read the entire article consisting of multiple parts.)
Patrick
If that is what Pmc bought then Pmc needs two T3.1A mains fuses. Fuse each transformer separately. You can choose to have a single mains fuse earlier in the power circuit and the single common fuse should be around T6A, or T8A.
Input ground > amp ground > disconnecting network or CL-60 or similar > chassis/earth ground.
(-) and (+) outputs might be connected to amp ground via 220Ω (R21 & R22), if you chose to use it.
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Yes, I used the R21 and R22 resistors. Should I remove these or should I just remove the CL-60 thermistors?
> Yes, I used the R21 and R22 resistors.
No, they have nothing to do with your problem.
Everyone, including me, used them and we have no problems.
> Should I remove these or should I just remove the CL-60 thermistors?
None of the above.
You have a short of your output to Gnd, according to you.
I would first check that, e.g. whether the Drains of your MOSFETs are touching the heatsink electrically.
> I just noticed there are 2 smd capacitors between the trim pots.
Optional, and you should not have soldered the electrolytic cap if you are not using cascode, as shown in your photo.
I suggest you do your testing with lab power supplies with current limit.
And you should short the inputs to Gnd during testing.
Patrick
No, they have nothing to do with your problem.
Everyone, including me, used them and we have no problems.
> Should I remove these or should I just remove the CL-60 thermistors?
None of the above.
You have a short of your output to Gnd, according to you.
I would first check that, e.g. whether the Drains of your MOSFETs are touching the heatsink electrically.
> I just noticed there are 2 smd capacitors between the trim pots.
Optional, and you should not have soldered the electrolytic cap if you are not using cascode, as shown in your photo.
I suggest you do your testing with lab power supplies with current limit.
And you should short the inputs to Gnd during testing.
Patrick