Yes for a regulated supply, it would be closer to 68V to 70V. It's possible you might get a little higher as the Antek transformers are 115V, so if you have 120V at your house you might have 72V.2picodumbs
in post #53-54 you recommended a 26v secondary, 500va Antek transformer.
Is the over voltage for a regulated supply where after the bridge the voltage would be 73v?
500VA would be the absolute bare minimum per channel, 600VA to 800VA per channel would be better.
I still haven't decided which way I am going to go with the supply.
Probably start with a switch mode supply first just to confirm the circuit operates correctly, then build up a regulated supply after that.
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I'm going linear. Today looked at pass transistor regulated supply schematics. I'm debating whether to go mosfet or bjt. Mosfet is sturdier, correct?
Try both.
The regulated supply I posted earlier is a decent "improvement" over the orginal but it still needs to be tested.
I had also thought about using a single IXTK140N20P in the supply instead of multiple devices.
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Been busy but I'll get my ar5e into gear soon.
Hi Pico & Diyers
Cool
Papa say on video BAF " is worst the efforts "
that mean for me little efforts
if compare to joy of use such single-ended giant amp
Next step i need huge psu transformers for planed monoblocks.
How is minimum transformer VA ratio for 50 watts rms = 600 VA mono ok ?
Have fun
I watched the video again today and Nelson said that the CCS is set by the 100Ohm resistor in the CCS; that sets up 1.1v across the .2 Ohm drain resistors. Do I have that correct?
I don't understand how the CCS works. How could I lower the draw from 3.2A to 1.6A?
I'm trying to figure it out with known values, but not getting it.
Maybe I should look at the original Zen amp article? It doesn't use an opto-coupler.
I don't understand how the CCS works. How could I lower the draw from 3.2A to 1.6A?
I'm trying to figure it out with known values, but not getting it.
Maybe I should look at the original Zen amp article? It doesn't use an opto-coupler.
Long story short, reason I'm asking is because I'd like to substitute IFRP240s instead of the mosfet pucks. If that works, then try SemiSouth R100 JFETs.
Short answer: yes.
Use some IRFP260s and get more power. They have a better (smaller) junction to case thermal resistance so they can dissipate more power. They're my go-to monster FET before I resort to anything exotic.
I still haven't found my monster IGBTs, but I found the original Ebay sale email, and I only got 3 of the pesky things, so I'm one short. On another note, I found a local source of the 500V version of Papa's Ixys monster, and I bought five (cheap, too). They'll get deployed sometime. They should be just as good as the 200V version for the uses discussed here so far....
I still haven't found my monster IGBTs, but I found the original Ebay sale email, and I only got 3 of the pesky things, so I'm one short. On another note, I found a local source of the 500V version of Papa's Ixys monster, and I bought five (cheap, too). They'll get deployed sometime. They should be just as good as the 200V version for the uses discussed here so far....
A single IRFP240 can handle 1.5A and 24v. It's 6x less than what it's spec'ed to do. I think it will be OK.
The long story is I don't want to re-task the 6w L'amp CCS SIT and F6 Jfet cases to build 50w mono blocks. I have a new (partially built) case waiting, so if I just take down the output requirement and dissipation, and try mosfets and the R100 jfet, it's a win-win. Then I can compare it to more amps.
The case should be able to dissipate 100w per channel.
Was reading the Sweet Spot article last night. If the device is locked to a voltage or current setting, one could still adjust other factors to play around with the sweet spot. At least that's what I took from the article. Just need a distortion analyzer. Lots of stuff on ebay for cheap, but some only have .1% capability.
The long story is I don't want to re-task the 6w L'amp CCS SIT and F6 Jfet cases to build 50w mono blocks. I have a new (partially built) case waiting, so if I just take down the output requirement and dissipation, and try mosfets and the R100 jfet, it's a win-win. Then I can compare it to more amps.
The case should be able to dissipate 100w per channel.
Was reading the Sweet Spot article last night. If the device is locked to a voltage or current setting, one could still adjust other factors to play around with the sweet spot. At least that's what I took from the article. Just need a distortion analyzer. Lots of stuff on ebay for cheap, but some only have .1% capability.
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