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Old 11th February 2014, 03:07 PM   #191
Kram is offline Kram  United Kingdom
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What should the specifications of the LED be? The BOM just mentions the lead pitch.

Thanks
Mark.
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Old 11th February 2014, 03:16 PM   #192
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Quote:
Originally Posted by Mark Johnson View Post
D'oh! Why not put all three on the same graph? So here they are.
  • Green trace = BJT (D44H11)
  • Blue trace = old MOSFET (IRFP240) that Jack simulated
  • Red trace = new MOSFET (IRF2805L) that I recommend
Magnitude plot only, sorry. For phase, perform eyeball extrapolation on graphs in previous post.
That's quite interesting Mark! Wish I knew how good the various models really are. Maybe there's no way around actually measuring one.

Jan
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Old 11th February 2014, 03:18 PM   #193
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Originally Posted by Kram View Post
What should the specifications of the LED be? The BOM just mentions the lead pitch.

Thanks
Mark.
I normally use a green LED because I have loads of them. I think any of the 2-3V LEDs are OK. There will be a variation in the current source but unless you want to push it up to 1A load I don't think it will matter.

Jan
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Old 11th February 2014, 03:24 PM   #194
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Originally Posted by jackinnj View Post
Nice transistor -- IRF2805 -- had a little trouble getting the model to work
Indeed, quite high transconductance, very low Ron, etc. Good catch Mark, this may be a viable alternative for a BJT in high-current applications.
Maybe I should add a few to my next parts order. Farnell has them at $ 4 one off.

Jan
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Old 11th February 2014, 03:29 PM   #195
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Originally Posted by jackinnj View Post
Here's a simulation bode plot of the SR with the MJD44H11 pass transistor and an IRFP240 mosfet pass device, AD825AR error amplifier
Jack how did you bias the opamp, did you put a zener in series with the opamp output?

Jan
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Old 11th February 2014, 03:34 PM   #196
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Originally Posted by jan.didden View Post
... this may be a viable alternative for a BJT in high-current applications.
Maybe I should add a few to my next parts order. Farnell has them at $ 4 one off.

Jan
Play with the infineon/NXP devices whose .MODELs are presupplied with LTSPICE; some of them perform still better in the Jung/Didden SuperRegulator. But since Jack and I can't get those in the USA , I mentioned the IR device instead. You may be able to get better MOSFETs, cheaper, purchasing from Netherlands.
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Old 11th February 2014, 06:42 PM   #197
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Quote:
Originally Posted by jan.didden View Post
Indeed, quite high transconductance, very low Ron, etc. Good catch Mark, this may be a viable alternative for a BJT in high-current applications.
Maybe I should add a few to my next parts order. Farnell has them at $ 4 one off.

Jan
Mouser has irf44rpbf at about 2 dollar each with .o28 ohm on and 15s forward trans min. driving it is only a little harder than irf240 with a magnitude of on res. lower . 60 volt rated . Just throwing out another pass transistor .
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Old 13th February 2014, 11:25 AM   #198
Kram is offline Kram  United Kingdom
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Quote:
Originally Posted by jan.didden View Post
I normally use a green LED because I have loads of them. I think any of the 2-3V LEDs are OK. There will be a variation in the current source but unless you want to push it up to 1A load I don't think it will matter.

Jan
Thanks, I think Ive sorted out my BOM now
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Old 14th February 2014, 07:43 AM   #199
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Default Newbee question for superreg.

Sorry to jump in with a basic question this far in the thread.. but I just discovered the thread today and wanted to implement the super reg as my first real DIY " newbee audio project" (with no magic smoke if possible)

I would like to replace my squeezebox touch PSU (1.5A) and the +5v on my CD Pro 2 Drive (1.5A)......

a. I have some AD797AN available..is a good choice for U1?

b...Also.... as I only require 2 +5 v PSUS can the negative side of the PCB be adapted for positive operation? (save buying 2 sets of PCBS?)

c... and..I also have to hand some BC550C but I don't think that's up to the pass transistor job is it?

Thanks for putting up with the questions this late on...I tried doing the math's by looking at the past threads but my results way off (I think?)

regards

Johnny
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Old 19th February 2014, 03:04 PM   #200
eddyvb is offline eddyvb  Belgium
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- It's possible to use the negative PS board, but you have to invert all polarized components on the board. Also you have to cut all the tracks to the opamp en swap input pins, and also voltage pins.
- For 1.5 amps output, most likely you have to tweak the current source (R1). Be careful not to overload the opamp. I've increased to current source from 4mA to 7.5mA to get 1A out with some margin. A larger heatsink could be necessary.
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