as long case is having enough but not too much ventilation slots (as when being without covers) , temperature uniformity inside case as one entity is sufficient
probably only in case of something really buggered, it wouldn't be enough, but in that case I believe problems would arise in other area, not current hogging of just one part
probably only in case of something really buggered, it wouldn't be enough, but in that case I believe problems would arise in other area, not current hogging of just one part
Thanks for the feedback ZM. I’m also thinking the thicker aluminum panels will help bridge a bit between sinks. If I need to I can also add additional aluminum or copper bar stock to bridge even more. And I will be sure not to over ventilate. 🙂
What Zen Mod said.
I built a 12" wide chassis using 1/8" aluminum plate and it is plenty strong, even with ventilation holes.
25W Single Ended Hammond 193V Choke Loaded 2SK180 L'Amp
I built a 12" wide chassis using 1/8" aluminum plate and it is plenty strong, even with ventilation holes.
25W Single Ended Hammond 193V Choke Loaded 2SK180 L'Amp
I built monoblocks using the 4U deluxe chassis and temperature at equilibrium is about 52 C with a babysitter
Thanks Zen and Ben. I will have no fear with my current build plans.
Good to know asphalt. I‘m using the equivalent of a 5U with 300mm depth sinks. So I‘m hoping I can get away without a babysitter. We’ll see.
Good to know asphalt. I‘m using the equivalent of a 5U with 300mm depth sinks. So I‘m hoping I can get away without a babysitter. We’ll see.
I got PCB's in for making my buddy's amp. Botte's concept with some tweaks. I made extras assuming some of you may want some.
If you're interested, head over the GB forum for details.
GB: Singing Bush Power Supply PCB Kit
If you're interested, head over the GB forum for details.
GB: Singing Bush Power Supply PCB Kit
Attachments
in an effort to keep everything neat and tidy they make these transformers:
https://www.antekinc.com/content/AN-8450.pdf
with dual 50 V and aux 12v and 18v.
Could I weasel my way into using the 12v and 18v aux secondaries for bias and get away with no addtl iron in the case? It needs -12V so I suspect the 12V maybe result in a little dirty ripple and the 18 would make the LM317 run a little hot. Any suggestions?
https://www.antekinc.com/content/AN-8450.pdf
with dual 50 V and aux 12v and 18v.
Could I weasel my way into using the 12v and 18v aux secondaries for bias and get away with no addtl iron in the case? It needs -12V so I suspect the 12V maybe result in a little dirty ripple and the 18 would make the LM317 run a little hot. Any suggestions?
that one perfect for stereo Singing Bush
though, you'll need proper big case, to get rid of heat of both channels
regarding aux windings, you got it right - if 12V sec result in little dirty regged rail, change to 18Vac and put smalllllllll heatsink on LM reg
current consumption is smidge above buffer Iq, so 20mA roughly plus some 10mA in reg itself...... so dissipation increase, ref to prescribed 15Vac secondary is just 90mW
though, you'll need proper big case, to get rid of heat of both channels
regarding aux windings, you got it right - if 12V sec result in little dirty regged rail, change to 18Vac and put smalllllllll heatsink on LM reg
current consumption is smidge above buffer Iq, so 20mA roughly plus some 10mA in reg itself...... so dissipation increase, ref to prescribed 15Vac secondary is just 90mW
So I’m starting to plan and gather parts for a monoblocks SIT version of Singin’ Bush. I’m looking at this 400VA, 45V Antek trafo (x2), which will give me the current I need when I parallel the two 45V secondary’s. My question - is it better to parallel the two AC lines and rectify together, or rectify each secondary separate and parallel the DC output?
AS-4445 - 400VA 45V Transformer - AnTek Products Corp
AS-4445 - 400VA 45V Transformer - AnTek Products Corp
50Vac secondary is more likely to get you where needed ...... expecting multiplier in range of 1.25 to 1.3 ..... with usual CRC or CLC filtering jobbie
ZM is Chicken- directly paralleling windings only when I'm sure they're bifillary wound
if not, each secondary getting own Graetz bridge, then connecting them in parallel, after bridges
ZM is Chicken- directly paralleling windings only when I'm sure they're bifillary wound
if not, each secondary getting own Graetz bridge, then connecting them in parallel, after bridges
Ok, that makes sense. Thanks! I may look for something out there with a single 50V and the 15V winding. Otherwise, may get small donut for the 15.
ZM, I believe I read in one of the SB posts that on power down the PSU caps drain very quick. Assuming that’s the case, think I can forgo bleeder R’s in my PSU’s?
The bleeder resistors aren't just for when the PSU is connected to the channel boards. They are really nice to have when testing the supply before the channel boards have been connected.
For sure. I was gonna use them throughout the testing procedure. Just haven’t decided if I’ll make more permanent provisions.
I'm not using them, no need in regular operation of A Class amps, while I'm never forgetting to whack them (powered off) with dummy load, when testing PSU