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Old 1st November 2010, 11:30 AM   #551
Salomon is offline Salomon  Germany
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Hi Owen,

For me a set of 4 FETs FQA32N20C's = 10$ CAD ?
Resistors set 4 ohmite 400 ohms = 24$ CAD ?
PCB 20$ CAD ?
SMD parts 23$ CAD ?
Shipping to Germany 8$ CAD ?

Please let me know total amount with shipping expenses to Germany to do the Paypal payment


Cheers,
Horst

Last edited by Salomon; 1st November 2010 at 11:40 AM.
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Old 1st November 2010, 12:42 PM   #552
opc is offline opc  Canada
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Hi Guys,

It would really be worthwhile for someone to do a matched group buy for transistors. You could easily get the price down to $1.00 per fet, and then charge a little for the matching service. I have had a lot of interest, but I only have one rail of the fets, and I don't want to part with all of them.

I would be more than willing to help someone set up a matching circuit. Once set up, it just takes time to run each transistor through.

Matching my devices into pairs made a very measurable difference in this circuit.

Merlin:

The list has been updated to include you as paid.

Salomon:

I don't have any fets or resistors left to sell, only the board and the SMD parts. For Germany, that would be a total of $51.

Regards,
Owen
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Old 1st November 2010, 01:31 PM   #553
qusp is offline qusp  Australia
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right, yeah I was going to buy some more fets too, I have 10 here, but that may or may not be enough to get 2 matched pairs that are closely matched. I would love to get the thin film ohmites too, but I dont know anywhere that has both values in stock. does digikey carry them? from memory I saw them at mouser one time, but very limited range. I could do the matching for VGS if you can tell me optimum values, but I dont really have the spare coin to buy a crapload of fets till after the move, all my spare coin has gone into that for the moment.

speaking of coin, i'll send you another email in a sec mate.
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Old 1st November 2010, 03:42 PM   #554
Salomon is offline Salomon  Germany
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Hello,

@ Owen
It is ok, that I get only the PCB and the SMD Kit
I have send you the money for it with PayPal 1 hour before.

But it is very difficult to get the Caddock resistors (4x 400 Ohm and 4x 200 Ohm) in Germany. The PCB-Design is made for the Caddock or other good TO220 Resistors. I hope I will find them, because i will not solder in other resistors. It would not look good on the PCB.

best regards
Horst
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Old 1st November 2010, 04:12 PM   #555
qusp is offline qusp  Australia
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why dont you make mouser, digikey, or parts connection order? partsconnection.com also have LT1085/1033 drop in regulator upgrades and a good range of film caps
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Old 1st November 2010, 04:17 PM   #556
Salomon is offline Salomon  Germany
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The problem are the Caddock resistors. The other parts I will find easier.
In Germany it is easier to get the 500R value instead of the 400R. Is it possible in this circuit to take 200R and 500R instead 200R and 400R?
I think I get 25% more Output-Level.
Get I other problems?

Regards
Horst

Last edited by Salomon; 1st November 2010 at 04:19 PM.
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Old 1st November 2010, 04:40 PM   #557
opc is offline opc  Canada
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qusp:

I picked up my Ohmite thin film resistors from Mouser, but I bought the last 12 pcs they had.

There must be a few other distributors that have stock somewhere. It's a bit of a specialty part, but it is listed as standard on the datasheet.

Salomon:

If at all possible, I would stick with the 400R value. You can use any TO-220 style resistors in this position, so check out DK, mouser and any of the others to see if anyone has stock. A quick search on Mouser brought up at least 3 options from Ohmite and Bournes

resistor

Regards,
Owen
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Old 1st November 2010, 04:52 PM   #558
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I believe that Parts Connexion has 390 ohm Caddocks
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Old 1st November 2010, 05:10 PM   #559
qusp is offline qusp  Australia
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I havent tried the bournes to220 parts, do you have an opinion on them opc? do they have the mounting hole or just like ohmite? I have some other things on backorder at mouser, maybe i'll add the ohmite to that, depends on whether its a usual stock item or if I have to order 10000 of them
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Old 1st November 2010, 05:18 PM   #560
Salomon is offline Salomon  Germany
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Sorry, I have the next question:

Typical applications use the LM317 and the LM337 with a max. input voltage of 35V to max. 40V. In the Datasheet I also found the max. value 40V.

If we use a transformer with 40C AC we get over 50V DC on the Input of the regulators.
Maybe we should make with a little bit lower voltage.
Are 35V on the Output of the regulators not enough?
Plaese help me, if i think wrong.

The 400R from Caddock I will order and wait a little bit for them.It`s ok, I donīt need them tomorrow.

regards
Horst

Last edited by Salomon; 1st November 2010 at 05:20 PM.
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