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Old 11th December 2012, 01:44 PM   #501
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It eats batteries for breakfast. I put wires to the outside and supply it with my lab PSU.
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Old 11th December 2012, 01:47 PM   #502
miepa is offline miepa  Austria
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guys,
i wasnt part of the GB, so, low current leds are recommanded, right?
thank you.
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Old 11th December 2012, 02:17 PM   #503
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yes, 2mA types.
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Old 12th December 2012, 07:25 AM   #504
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Dubai, can you read german? Nothing against ATLAS,
I ordered according to HB:
Paradise Transistor matching | Holger Barske

Quote:
Originally Posted by dubai2000 View Post
I am new to transistor matching so the question might be silly, but would a device such as the following be useful?

Found at Reichelt: ATLAS DCA55

Your feedback will be appreciated - thx.

dubai2000
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Old 12th December 2012, 08:02 AM   #505
FdW is offline FdW  Netherlands
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Quote:
Originally Posted by FdW View Post
I will, tonight, have a look at them. At first glance it seems the V(be Q102) is a bit low, and that this is debit of the current unbalance.
Yesterday I did not manage to do this, I will try to do it this evening
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Old 12th December 2012, 05:00 PM   #506
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Thanks for all the feedback - including for the link to Holger's page.

dubai2000
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Old 12th December 2012, 05:19 PM   #507
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The Hfe tester that Holger found works well but it does nave have the much higher functionality of the Atlas. If you do only want to select BJTs for the Paradise it is sufficient.
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Old 12th December 2012, 07:52 PM   #508
beetle is offline beetle  Germany
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Quote:
Originally Posted by FdW View Post
Yesterday I did not manage to do this, I will try to do it this evening
No problems. Take your time.
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Old 14th December 2012, 08:22 AM   #509
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Joachim, I'm worried about transistor matching how close do they actually have to be?

Is it more important to have a good balance between 327 and 337 or more important to have them matched within each quad, ie 4 327 with the same value as each other?

I can get good quads, ie 4 x 327 with identical values, or I can get a good balance with a looser match yielding a combined HFe that matches between 327 and 337. But I can't get closely matched for both...


Failing that does anyone have 8 337 with an HFe of 400?

I will put my list up later today
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Old 14th December 2012, 08:40 AM   #510
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After matching approx. 800 each still trying.
I will order again 300 each from a reliable source...
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