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Old 19th September 2012, 06:32 AM   #251
rellum is offline rellum  France
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Hi Rudi,

Count me in for:

4 x Shunt psu PCBs
4 x 0.1R resistors
2 x NJLs matched transistors

Thanks,
Francis
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Old 19th September 2012, 07:46 AM   #252
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Joshvi,

I prefer the NJL0 to the NJL1/3 due to their lower COB (400pF vs. 600pF).

I have attached an image showing the result of the values of the transistors that Mihai used after having matched them.
Mihai matched his transistors at 100mA Ic and 20Vce.
I will match the transistors at 350mA Ic and 12Vce. (OnSemi does at 1A Ic and 5Vce, ...)
I will not measure Vbe nor will I do "cross-matching", but I will measure Vf of the integrated diodes and group the NPN- and PNP - triples in a way
that I "combine" the NPN- and PNP triples according to their Hfe values.

For example: I will take the NPN- and PNP-triple with the lowest Hfe values and mark the transistor whose TT-diode has the highest Vf.
These 6 transistors shall be soldered on a PCB and the TT-diode of the marked transistor shall be bypassed by means of the on-board jumper.

Find enclosed the current order EXCEL sheet.

Best regards - Rudi_Ratlos

P.S. @JethroTull: can you please give me your address (by PM)? I did not find it in your PAYPAL transfer sheet.
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Old 19th September 2012, 08:08 AM   #253
AndrewT is offline AndrewT  Scotland
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You don't need to match the transistors at 350mA.

You do need to match the outputs at the operating quiescent bias, i.e. 170 to 180mA.
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regards Andrew T.
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Old 19th September 2012, 08:46 AM   #254
roender is offline roender  Romania
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Quote:
Originally Posted by AndrewT View Post
You don't need to match the transistors at 350mA.

You do need to match the outputs at the operating quiescent bias, i.e. 170 to 180mA.
It's enough at 100mA, even lower at 50mA, because beta is constant after this point till over 2A.
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Old 19th September 2012, 08:57 AM   #255
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Thank you Andrew, Mihai.
I will decrease Ic to about 140mA (arithmetic mean of your advices ) then.

Best regards - Rudi_Ratlos
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Old 19th September 2012, 10:52 AM   #256
jszjsz is offline jszjsz  Hungary
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Quote:
Originally Posted by zsaudio View Post
I use their R-Core trafos. Those trafos look marvellous.

I know them but
- what about small transformer with the 2*34V secunder? They do not have it.
- the 120W-size seems to be small and do not have mounting plate,
- the 300W-size is big and expensive.

(Again: I`m to build two monoblocks.)
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Old 19th September 2012, 01:18 PM   #257
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Fabrizio: I received your PAYPAL transfer! It was easy, wasn't it?

JSZJSZ: some of the German DIYers of round 1 and I ordered a "customer specific wound toroidal" rated at 4 x 34VAC, 50W from BADEL:

produkte der badel gmbh, ringskerntransformatoren

The price was <20; the lead-time was about 4 weeks. Minimum amount to order is 5, as I remember.
You can even ask BADEL to shield the transformers, put them into a case, ...

Maybe there is some interest of the EUROPEAN participants and you can arrange a "transformer - group-buy"?

Best regards - Rudi_Ratlos
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Old 19th September 2012, 02:52 PM   #258
jszjsz is offline jszjsz  Hungary
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Thank you, Rudi, the toroidal is not a problem. I would like to stay with the R-core. If I find a good source then I will post it to the list.
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Old 19th September 2012, 05:51 PM   #259
zsaudio is offline zsaudio  Europe
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Quote:
- what about small transformer with the 2*34V secunder?
I connect two small ones in serial.
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Old 19th September 2012, 06:20 PM   #260
joshvi is offline joshvi  India
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Rudi,

please change my count as follows

AMP - 4Nos.
shunt - 4Nos.
LS Pro - 2Nos.
Soft PO- 2Nos.
0R1 Res- 4Nos.
NJL Pair- 0
Mkp1839-4Nos.

Best regards
Joshvi
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