50-ish should be OK with these FETs. My mini-Aleph is at high 50's in summer, and it has survived 2 summers.
45C is good for life. 55-60C sustainable but precarious. Does your Ref C pass DC if it gets it in the input?. Because your only fear would be to lose one supply and get full DC of the working supply on DCB1's output. If not, the most trouble would be to exchange a burned Mosfet, but unlike at 53C in a month's use.
Yes up to 50C I would not worry for long term reliability with the 240's. If they were TO-220s maybe.
Read voltage across 10R Rset resistors, and divide by 10. The number is in Ampere.
Thanks Salas,
the MyRef at the moment is DC-coupled too since I'm experimenting with components change and the input cap can mask a lot of differences...
The amp has a DC protection but... I'll think about it...
Install a proper value input cap regarding REF C's input impedance. Russian K40Y bypassed with FT1 22nF. Its a cheap and effective combo. That will guard your speakers in any case (except main amp's failure) in the future. Don't forget sources failures and experiments that can give something bad too. Unless that REF C's DC guard is bomb proof, better be safe than sorry for the years to come.
It will not make any real difference, but you can parallel a 75R 1W resistor to the one resistor already installed on the 197mA side at a point, and get them currents almost the same. But don't lose sleep over it. Is the negative polarity the 197mA running one?
I see. No, the 197mA is on the positive...
thanks for your patience. i've learned a lot w/ this build.
Its due to VGS variations between PMOS-NMOS and their batches if the LEDS are exactly the same. Natural. They also change VGS a little depending on current and voltage scale they work. Nothing to think about twice. Enjoy you integrated. See ya.🙂
Huh. Well since this entire enclosure is the heatsink maybe I'll be the first. I don't know if I can fit a 12w Mills in there though. Maybe 2 7R 5w in parallel for 3.5ohm?
Hey, anyone deciding to up your bias, dont forget that not only do you need a big heatsink, but you need a transformer that can handle it.
I dunno what you will bias to, but you need to figure the draw of the entire circuit and get one that will cover that much power. Since you wont be worrying about taking care of big transients or increases in music draw I would multiply your bias by the number of devices by the voltage and perhaps double that. You dont want to push your transformer to the point of getting hot and saturating.