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Old 26th May 2013, 07:40 PM   #1021
Stefanoo is offline Stefanoo  Italy
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Can we please stop rate this post terrible???

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Old 26th May 2013, 08:23 PM   #1022
merlin el mago is offline merlin el mago
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Done
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Old 26th May 2013, 09:27 PM   #1023
Stefanoo is offline Stefanoo  Italy
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Thankssss
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Old 28th May 2013, 03:59 PM   #1024
Stefanoo is offline Stefanoo  Italy
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Joachim....I was looking at simulation and BCP53/56 and it seems that we could improve noise performance by choosing different parts there.

I know you guys use the BC parts however these don't come as SMT parts.

Do you have any recommendation as far as SMD (TO261) is concerned?
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Old 28th May 2013, 04:19 PM   #1025
Joachim Gerhard is offline Joachim Gerhard  Germany
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Yes, the BCs come in SMD. I forgot how they are called but i can find them.
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Old 28th May 2013, 04:20 PM   #1026
Joachim Gerhard is offline Joachim Gerhard  Germany
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here we go..
http://www.nxp.com/documents/data_sh...817W_BC337.pdf
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Old 28th May 2013, 04:22 PM   #1027
Joachim Gerhard is offline Joachim Gerhard  Germany
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here is the PNP...
http://www.nxp.com/documents/data_sh...807W_BC327.pdf
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Old 28th May 2013, 04:43 PM   #1028
buzzforb is offline buzzforb  United States
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Dual Die
BCM847BS, BCM857BS
SSM2212 and SSM2220

individuals

BC846B/C, BC856B/C (65V)
BC850B/C, BC860B/C (45V)
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Old 28th May 2013, 04:54 PM   #1029
Stefanoo is offline Stefanoo  Italy
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interesting.
Thank you to you both.
Which one is better?

Also I have a question: some of the BJTs on the mirror have to dissipate 250mW, do you think that a SOT 23 package would be suitable for that?
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Old 28th May 2013, 04:58 PM   #1030
Joachim Gerhard is offline Joachim Gerhard  Germany
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You can any time parallel two transistors. Hfe stays the same and you can dissipate double.
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