Paradise Builders - Page 28

Bksabath · 17th November 2012, 09:51 AM

Quote:

Originally Posted by dBudBu

I'm noticing my boards are labeled Paradise R2 and all the documentation is for Paradise R3. Are there any differences that I should be aware of?

Thanks,
Mark

I have not recivied my R3 boards so far but no rush there as I have R2 running

As far as I know same foot print for J fets have changed (easier to solder on R3) and Imput off set is now on board I have soldered those components on botom of my R2 boards.

brozatus · 19th November 2012, 08:48 AM

As we have lots of leds on the pcb I ask if it
is allowed to use one of them as a power on
indicator on the front of the case, cabeled to
the front.
We have green leds, but for this one I will have
a red led.

Does this matter or bring any harm to the circuit?

Thanks,
Christoph

RCruz · 19th November 2012, 09:13 AM

Quote:

Originally Posted by brozatus

As we have lots of leds on the pcb I ask if it
is allowed to use one of them as a power on
indicator on the front of the case, cabeled to
the front.
We have green leds, but for this one I will have
a red led.

Does this matter or bring any harm to the circuit?

Thanks,
Christoph

IMO it would be better to place a led (with a 10k resistor in series) connected to your raw DC psu, after the rectifying diodes and before the smoothing caps.

FdW · 19th November 2012, 09:25 AM

Quote:

Originally Posted by brozatus

As we have lots of leds on the pcb I ask if it
is allowed to use one of them as a power on
indicator on the front of the case, cabeled to
the front.
We have green leds, but for this one I will have
a red led.

Does this matter or bring any harm to the circuit?

Thanks,
Christoph

No that is not allowed, this would influence the HF performance of the PSU in a very bad/averse way.

brozatus · 19th November 2012, 09:42 AM

Ok,
no go from you.

I will not do it this way.

Thanks for helping,
Christoph

LouderIsBetter · 21st November 2012, 07:13 PM

I’m having trouble finding BC337-40 and BC327-40 transistors with HFE in the same ballpark between NPN and PNP types. It appears only Fairchild is available here in the US. I ordered 250 of each in ammo pack from Mouser. I get lots of good matches with BC337-40 with HFE in the 490 to 525 range. And lots of good matches with BC327-40 in the 340 to 360 range. But no BC327-40 with HFE higher than 360. So no High HFE BC327-40 to match with the BC337-40. Would it be a good idea to order some more BC327-40 from another supplier such as DigiKey in hopes to get a batch with higher HFE or will that prove to be futile? If not what to do next to get some high HFE BC327-40?

Thanks,
Mark

Bksabath · 21st November 2012, 07:34 PM

Got mine from Fairchild direct

was about £20 for 1000 + A very large ammountof £ for P&P (to embarasing to say) and another £38 for Custom &exices

You can get much beter deal if you are in the US
HFE from those vas prety hi and avveraged at about 540

AVWERK · 22nd November 2012, 03:29 PM

Louder did get his from Fairchild Via Mouser.
Bk, are you saying buying directly has something to do with closer matching HFE for both?
How would that be possible? It would be nice to not throw money away in our search

Regards
David

hesener · 22nd November 2012, 03:41 PM

That was just luck. Difficult to tell from which wafer the transistors came....

Bksabath · 22nd November 2012, 03:49 PM

No not saing closer matching
Just that I had my direct and that if you are in the States it became competitive to go that way
About HFE I am saiing that that particulr batch of Fairchild was prety hi
Different batches may be different
Yes kissed by lady luck this time....

Mine where loose in big bag, ammo pack normaly is beter for matching.

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19th November 2012, 08:48 AM	#272
brozatus diyAudio Member Join Date: Dec 2006 Location: Berlin	As we have lots of leds on the pcb I ask if it is allowed to use one of them as a power on indicator on the front of the case, cabeled to the front. We have green leds, but for this one I will have a red led. Does this matter or bring any harm to the circuit? Thanks, Christoph

19th November 2012, 09:42 AM	#275
brozatus diyAudio Member Join Date: Dec 2006 Location: Berlin	Ok, no go from you. I will not do it this way. Thanks for helping, Christoph

21st November 2012, 07:13 PM	#276
LouderIsBetter diyAudio Member Join Date: Jan 2008	I’m having trouble finding BC337-40 and BC327-40 transistors with HFE in the same ballpark between NPN and PNP types. It appears only Fairchild is available here in the US. I ordered 250 of each in ammo pack from Mouser. I get lots of good matches with BC337-40 with HFE in the 490 to 525 range. And lots of good matches with BC327-40 in the 340 to 360 range. But no BC327-40 with HFE higher than 360. So no High HFE BC327-40 to match with the BC337-40. Would it be a good idea to order some more BC327-40 from another supplier such as DigiKey in hopes to get a batch with higher HFE or will that prove to be futile? If not what to do next to get some high HFE BC327-40? Thanks, Mark

21st November 2012, 07:34 PM	#277
Bksabath diyAudio Member Join Date: Dec 2007	Got mine from Fairchild direct was about £20 for 1000 + A very large ammountof £ for P&P (to embarasing to say) and another £38 for Custom &exices You can get much beter deal if you are in the US HFE from those vas prety hi and avveraged at about 540

22nd November 2012, 03:29 PM	#278
AVWERK diyAudio Member Join Date: Jan 2004 Location: OC,Calif.	Louder did get his from Fairchild Via Mouser. Bk, are you saying buying directly has something to do with closer matching HFE for both? How would that be possible? It would be nice to not throw money away in our search Regards David

22nd November 2012, 03:41 PM	#279
hesener diyAudio Member Join Date: Mar 2005 Location: Munich, Germany	That was just luck. Difficult to tell from which wafer the transistors came....

22nd November 2012, 03:49 PM	#280
Bksabath diyAudio Member Join Date: Dec 2007	No not saing closer matching Just that I had my direct and that if you are in the States it became competitive to go that way About HFE I am saiing that that particulr batch of Fairchild was prety hi Different batches may be different Yes kissed by lady luck this time.... Mine where loose in big bag, ammo pack normaly is beter for matching.