Depends on your voltages - I recall this amp was Class A and +/-16v and maybe 2A? Thats 64w per amp. I don’t think that heatsink is enough for 128w. But a 120mm PWM Noctua running around lowest silent speed will cool it just fine.
Looks a big enough and thick enough piece of aluminum to me.
The DLH circuits I looked at are way below 64 Watts .
The DLH circuits I looked at are way below 64 Watts .
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No chance. those 2 ch will have about 50W total dissipation i would guess.
+/-15Vdc rails and about 0.8A bias. Mudushop's 3U300mm heatsink would do the job.
+/-15Vdc rails and about 0.8A bias. Mudushop's 3U300mm heatsink would do the job.
Try it and see if the sink is 55C or less after a couple of hours of warm up.
If it's too hot, use an impingement fan (or two) on the fins. Use mica or better insulators.
If it's too hot, use an impingement fan (or two) on the fins. Use mica or better insulators.
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Approximately 1200 cm ^ 2. Depends on permissible temperature and power.
One channel may be enough. (Or one transistor).
See recommendations and calculations for your option DLH.
One channel may be enough. (Or one transistor).
See recommendations and calculations for your option DLH.
Thanks.I'll probably just try it and see. This version of the DLH amp is rated at pretty low wattage. 3.88 at 8 ohms, 7.76 at 4 ohms and 15.52 at 2 ohms. I haven't kept up with all the different versions but this one is from the first four or five pages of the thread.
DLH Amplifier: The trilogy with PLH and JLH amps
DLH Amplifier: The trilogy with PLH and JLH amps
Attachments
The wattage it puts out doesn’t matter. Just look at the notes for the voltage and bias current. It’s +/-15.6v, call it +/-16v. 2 amps.
That’s power = current x voltage.
Watts of dissipation into heatsink = 16v x 2 x 2A = 64W. That’s about what a 4U x 300mm Class A heatsink on the typical DIY store chassis can do per side.
If you find a heatsink with a dissipation rating say, 0.55C/W. Take 64W x 0.55C/W = 35C rise. Add that to ambient temp, say 22C for typical N American home w AC and you get 57C. Which is just a tad above the usual 55C “acceptable” norm. That’s basically the temp where you feel like it can burn you if you hold it for more than a few seconds.
That’s power = current x voltage.
Watts of dissipation into heatsink = 16v x 2 x 2A = 64W. That’s about what a 4U x 300mm Class A heatsink on the typical DIY store chassis can do per side.
If you find a heatsink with a dissipation rating say, 0.55C/W. Take 64W x 0.55C/W = 35C rise. Add that to ambient temp, say 22C for typical N American home w AC and you get 57C. Which is just a tad above the usual 55C “acceptable” norm. That’s basically the temp where you feel like it can burn you if you hold it for more than a few seconds.
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Thanks X. Ya know, I feel a little embarrassed. I know about power dissipation and I completely ignored it. You even pointed it out in your first response of this thread. Your answer smacked me in the head and said wake up. This down time has got me messed up. Again, thanks for the explanation.
Hi Ripcord,
No need to feel embarrassed and did not mean to make you feel that. Just explaining the way to estimate your heatsink requirements. Yes, the SLB is perfect for this application. If you want 16v, you need to account for 3v drop in SLB cap multiplier and about 3v or so sag in trafo under a Class A load. Assuming you go with dual mono setup and Antek I would size it 3x rated capacity. So 3x64W is about 200VA. And need 16v plus 3v drop plus 3v sag for 22vdc no load. 22v/1.41 = about 16v. Given a choice of 15v or 18v. Depending on your heatsink go 18v if a big heatsink and 15v if smaller.
No need to feel embarrassed and did not mean to make you feel that. Just explaining the way to estimate your heatsink requirements. Yes, the SLB is perfect for this application. If you want 16v, you need to account for 3v drop in SLB cap multiplier and about 3v or so sag in trafo under a Class A load. Assuming you go with dual mono setup and Antek I would size it 3x rated capacity. So 3x64W is about 200VA. And need 16v plus 3v drop plus 3v sag for 22vdc no load. 22v/1.41 = about 16v. Given a choice of 15v or 18v. Depending on your heatsink go 18v if a big heatsink and 15v if smaller.
The DHL does not accept large thermal variation cold /hot . The adjustments made at hot, the amp doesn't bias itself at cold. See the post 545 DLH Amplifier: The trilogy with PLH and JLH amps .