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

[relder]

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]

Transistors.

Standard reference designator for transistors in schematics...

 

[Nelson Pass]

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]

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]

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]

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]

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]

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]

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]

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

 

[moses]

Not to mention that the TO-3 parts aren't really easy to come by, compared to the TO-220 parts. And now for a dumb question, on the order site, it states $50 for a pair of PCBs and $50 for a pair of Q-Packs, I assume that means the PCBs and transistors todo a stero amp?


Thanks.

 

[Luke]

Is TO 3P different to To247 package? And is there a difference between IRF240 and IRFP240?

 

[herm]

I clicked on the search tab at the top of the page and typed in

difference irf240 irfp240

and among others it gave me this thread:

http://www.diyaudio.com/forums/showthread.php?s=&threadid=1867&highlight=difference+irf240+irfp240

typing in

to-247 to-3p

gave this thread:

http://www.diyaudio.com/forums/showthread.php?s=&threadid=3269&highlight=to247+to3p

 

[moses]

Err, my bad. I assumed that the TO-3P was similiar to a TO-3, which it isn't, sorry. This semiconductor site even lists the part as the exact thing, sorry for the confusion if I caused any.

 

[Karen]

$50.00 for two boards, $50.00 for one "Q" pack which includes the semi's for both boards. Stereo....

 

[Luke]

Herm,

thanks for the search, answered my question
I got confused bout this cos Ive seen the same looking packages called TO247 and TO3P, The one and only states they are the same.

 

[jag]

The Q pack also includes the "sil-pads" needed to insulate the T0-3P's.

Okay, now I have the sil-pads (part of Q pack). Do you need to apply thermal grease to sil-pads?

Thanks.

 

[pjkunz]

No, they're meant to be used as is, no grease.

 

[Karen]

Absolutely correct, sir!

 

[Coulomb]

$50.00 for two boards, $50.00 for one "Q" pack which includes the semi's for both boards. Stereo....

So another dumb question, that means $100 for boards and semis for stereo operation?

I think this last question should really nail it down.

Anthony