Dumb question: What's a Zen V4 Q Pack?

relder · 19th September 2002, 08:00 PM

At pass diy they have the Zen v4 PCB's for sale and also a Zen v4 Q Pack. What's the Q Pack consist of? Haven't heard that term.

Thanks

harvardian · 19th September 2002, 08:02 PM

Transistors.

Standard reference designator for transistors in schematics...

Nelson Pass · 19th September 2002, 08:47 PM

Actually the "Q" pack is all the semiconductors, with
IRFP044N for Q1 and IRFP240's for the other two
power Mosfets, and includes the diodes.

miguel2 · 20th September 2002, 09:06 AM

So it is better to use IRF240's for Q2 and Q5 and a IRFP044 for Q1? If Q5 dissipates around 20W and Q2 the same as Q1 why is this change? More bias? What is the package of Q2 and Q5 in the Q Pack, are they T03?

Miguel

Nelson Pass · 20th September 2002, 06:17 PM

Not better. For the current source and supply
regulator, we don't need the high transconductance
of the 044, and we have tons of 240's.

The pacakges are the "TO-3P" plastics.

jag · 26th September 2002, 03:47 PM

Pl excuse my ignorance, but I read in several threads that MOSFETs do not need to be matched for Zen4

Why is pass labs offering the Q pack then

Karen · 26th September 2002, 04:09 PM

We want to make it easy for you to complete your projects. Just for convenience. No hidden agenda, the mosfets do not need to be matched in Zen 4. The Q pack also includes the "sil-pads" needed to insulate the T0-3P's.

relder: That term was just made up, I thought it was rather clever.

Petter · 26th September 2002, 04:47 PM

When I bought SilPad 2000 a while back I had to do a minimum order from Bergqvist which was a little ridiculous ...

This is once again a very good service from Pass Labs. I wish others would be 10% as forthcoming

Petter

jag · 26th September 2002, 06:19 PM

Thank you! Thank you! Thank you!

I had already sent in my check for the Q pack, was just curious as to why (should Pass Labs) take all the botheration when components are readily availavle on digikey. This explains everything.

Thanks again!

till · 26th September 2002, 06:26 PM

jag, this components arent that easy avaiable everywhere in the world; and DIY community seems to be a very very international one.

19th September 2002, 08:00 PM	#1
relder diyAudio Member Join Date: Jan 2002 Location: Tucson, AZ Blog Entries: 14	Dumb question: What's a Zen V4 Q Pack? At pass diy they have the Zen v4 PCB's for sale and also a Zen v4 Q Pack. What's the Q Pack consist of? Haven't heard that term. Thanks

19th September 2002, 08:02 PM	#2
harvardian diyAudio Member Join Date: Dec 2001 Location: Austin, TX	Transistors. Standard reference designator for transistors in schematics... __________________ doing my part to Keep Austin Wierd.

26th September 2002, 04:09 PM	#7
Karen diyAudio Member Join Date: Sep 2001 Location: Foresthill, CA	We want to make it easy for you to complete your projects. Just for convenience. No hidden agenda, the mosfets do not need to be matched in Zen 4. The Q pack also includes the "sil-pads" needed to insulate the T0-3P's. relder: That term was just made up, I thought it was rather clever. __________________ ..K

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19th September 2002, 08:47 PM	#3
Nelson Pass The one and only Join Date: Mar 2001	Actually the "Q" pack is all the semiconductors, with IRFP044N for Q1 and IRFP240's for the other two power Mosfets, and includes the diodes.

20th September 2002, 09:06 AM	#4
miguel2 diyAudio Member Join Date: Jun 2002 Location: Portugal	So it is better to use IRF240's for Q2 and Q5 and a IRFP044 for Q1? If Q5 dissipates around 20W and Q2 the same as Q1 why is this change? More bias? What is the package of Q2 and Q5 in the Q Pack, are they T03? Miguel

20th September 2002, 06:17 PM	#5
Nelson Pass The one and only Join Date: Mar 2001	Not better. For the current source and supply regulator, we don't need the high transconductance of the 044, and we have tons of 240's. The pacakges are the "TO-3P" plastics.

26th September 2002, 03:47 PM	#6
jag diyAudio Member Join Date: Aug 2002 Location: TX	Pl excuse my ignorance, but I read in several threads that MOSFETs do not need to be matched for Zen4 Why is pass labs offering the Q pack then

26th September 2002, 04:47 PM	#8
Petter diyAudio Member Join Date: Jan 2001 Location: Scandinavia	When I bought SilPad 2000 a while back I had to do a minimum order from Bergqvist which was a little ridiculous ... This is once again a very good service from Pass Labs. I wish others would be 10% as forthcoming Petter

26th September 2002, 06:19 PM	#9
jag diyAudio Member Join Date: Aug 2002 Location: TX	Thank you! Thank you! Thank you! I had already sent in my check for the Q pack, was just curious as to why (should Pass Labs) take all the botheration when components are readily availavle on digikey. This explains everything. Thanks again!

26th September 2002, 06:26 PM	#10
till Banned Join Date: Apr 2002 Location: Germany, Clausthal	jag, this components arent that easy avaiable everywhere in the world; and DIY community seems to be a very very international one.

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