matched pair?
Hi,
where can I get a matched pair Q1 & Q2's?
I'm filling out my order @ digikey and can't find the 2sk370 or 2sj108 (let alone get them matched.)
I've found all the other parts on digikey no problem ( a bit more than I thought I would spend on parts for one channel.)
Any suggestions?
Hi,
where can I get a matched pair Q1 & Q2's?
I'm filling out my order @ digikey and can't find the 2sk370 or 2sj108 (let alone get them matched.)
I've found all the other parts on digikey no problem ( a bit more than I thought I would spend on parts for one channel.)
Any suggestions?
Re: matched pair?
www.tech-diy.com - very good outlet for little parts.
I still dont understand on F5, if we are matching q1 to q1 (other channel) or q1 to q2 on same channel. I assume the later.
merlin2069er said:
www.tech-diy.com - very good outlet for little parts.
I still dont understand on F5, if we are matching q1 to q1 (other channel) or q1 to q2 on same channel. I assume the later.
chrismercurio said:
Tried them, they refunded my $$$. 🙁 (I'm in Canada, and they won't ship to an unconfirmed paypal address.)
Anywhere else?
Re: Re: matched pair?
As others have noted, it's not really practical to match N- and P-channel devices. (ie. impractical to match q1 to q2) Also, since we don't match q1 to q2 or q3 to q4, there wouldn't seem to be much point to match left and right channel q1s. One completely unmatched set should be as good as any other completely unmatched set.
-j
Tea-Bag said:
As others have noted, it's not really practical to match N- and P-channel devices. (ie. impractical to match q1 to q2) Also, since we don't match q1 to q2 or q3 to q4, there wouldn't seem to be much point to match left and right channel q1s. One completely unmatched set should be as good as any other completely unmatched set.
-j
Re: Re: Re: Re: matched pair?
it's IDSS not Vgs, so I am still not sure of the answer to my question.
merlin2069er said:
it's IDSS not Vgs, so I am still not sure of the answer to my question.
Re: Re: Re: Re: matched pair?
Not entirely true. You would want to have the idss in the same range on n and p types - the variation is quite large.
Save yourself a lot of time and get your address confirmed on paypal.
Diomedian said:
Not entirely true. You would want to have the idss in the same range on n and p types - the variation is quite large.
merlin2069er said:
Save yourself a lot of time and get your address confirmed on paypal.
I agree. Tech-Diy had my stuff to me in less than a week. About as fast as Mouser or Digikey via usps and it was well packed.
Here is a ? for Nelson or others:
Nelson,
One of the most peculiar and interesting things about the F5 to me is that it is void of capacitors in the signal path. Have you considered (perhaps for a different Fx amplifier) creating a similar amplifier that is SETransistor in nature (capacitorless)? Almost like a DC SET tube amp (without the OPT and the tubes of course)?
Chris
Re: Re: Re: Re: Re: matched pair?
hmm - guess that makes sense. Thanks for the tip cviller.
-j
cviller said:
hmm - guess that makes sense. Thanks for the tip cviller.
-j
try to get Idss of Q1 & Q2 to match within a few percent.
Both pass the same current and matching Idss gets both devices onto similar parts/slopes of the transconductance curve.
I think it will difficult to set up a matching jig to try to match the transconductance as well as the Idss of Nchannel to Pchannel.
It's relatively easy, but very labour intensive to match Idss AND transconductance over a small range of Id with all Nchannel OR all Pchannel.
The yield from this supermatching is very low with small batches (say 25 off) and still not great with 100 off batches.
Both pass the same current and matching Idss gets both devices onto similar parts/slopes of the transconductance curve.
I think it will difficult to set up a matching jig to try to match the transconductance as well as the Idss of Nchannel to Pchannel.
It's relatively easy, but very labour intensive to match Idss AND transconductance over a small range of Id with all Nchannel OR all Pchannel.
The yield from this supermatching is very low with small batches (say 25 off) and still not great with 100 off batches.
Re: Re: Re: Re: Re: matched pair?
I called paypal, they can't confirm any Canadian address. 🙁
cviller said:
I called paypal, they can't confirm any Canadian address. 🙁
Re Paypal
Hi there,
I purchased 2x F5 kits from Tech-DIY on Dec 12th 2008.
I live in New Zealand and paid via Paypal with unconfirmed address, so your situation seems a bit strange ??
Cheers,
Les.
Hi there,
I purchased 2x F5 kits from Tech-DIY on Dec 12th 2008.
I live in New Zealand and paid via Paypal with unconfirmed address, so your situation seems a bit strange ??
Cheers,
Les.
AC LINE CAPS
What kind of AC line capacitor is the correct, X1 or X2? Can I choose a 0,0047uF X1 cap.
Thanks
What kind of AC line capacitor is the correct, X1 or X2? Can I choose a 0,0047uF X1 cap.
Thanks
Re: AC LINE CAPS
X2 will do as far as I know. X1 is rated up to something like 2500V.
-j
juluska said:
X2 will do as far as I know. X1 is rated up to something like 2500V.
-j
for domestic/house systems you can use either X1 or X2 across the lines.
Similarly use either Y1 or Y2 between Earth and Line.
Similarly use either Y1 or Y2 between Earth and Line.
Re: Re Paypal
After Nelson mentioned the webstore I got a flood of orders, and a number of flakes...and attendant chargebacks. It's just wonderful as a vendor to see someone who filed a chargeback proclaim how wonderful their F4 or F5 sounds.
PayPal is awful for vendors. Even with USPS proof of delivery you can get hit with a charge-back. I am thinking of shutting the webstore down, or just selling PCB's for the National Semi Overture series.
Lesp said:
After Nelson mentioned the webstore I got a flood of orders, and a number of flakes...and attendant chargebacks. It's just wonderful as a vendor to see someone who filed a chargeback proclaim how wonderful their F4 or F5 sounds.
PayPal is awful for vendors. Even with USPS proof of delivery you can get hit with a charge-back. I am thinking of shutting the webstore down, or just selling PCB's for the National Semi Overture series.
Re: Re: Re Paypal
Jack, your too nice and don't charge enough to cover that....
Anyways, if these guys on the list are ripping you off. I say call them out and have then banned.
We don't need crooks here.😡
jackinnj said:
Jack, your too nice and don't charge enough to cover that....
Anyways, if these guys on the list are ripping you off. I say call them out and have then banned.
We don't need crooks here.😡