Question About Transistor Matching

SSDIY · 24th October 2009, 02:40 AM

Hi I am new to this forum. I got the following transistor matching circuit from the internet it is quite simple and easy to build but the upper section (for NPN measurement) of the circuit has one 10K resistor connected between the two transistors while the lower section (for PNP measurement) has none. Would anyone please tell me is this a drawing mistake? Which one is correct? Thanks.

fritz39 · 24th October 2009, 04:49 AM

Your picture is too small to see.

SSDIY · 24th October 2009, 06:12 AM

Try again

planet10 · 24th October 2009, 06:35 AM

That is still the same size as the last posted image.

dave

sandyK · 24th October 2009, 07:57 AM

Planet10
I now have the same problem when posting images here, that are hosted by ImageShack. Even though the original picture may be quite large, since the DIYAudio upgrade, it is the thumbmail that is being used , instead of being able to use the clickable option for a large image. Perhaps as a Moderator, you may be able to find out why the original option no longer works.
It certainly still functions in other forums.
Regards
SandyK

SSDIY · 24th October 2009, 09:52 AM

The original image is a Jpeg 100k file. It has been compressed when uploading to the thread. Could anyone help to post it with a bigger size if I send him the file?

Jan Dupont · 24th October 2009, 11:31 AM

Make a PDF file and attach that or email it to me.....

SSDIY · 24th October 2009, 12:22 PM

Quote:

Originally Posted by Jan Dupont

Make a PDF file and attach that or email it to me.....

Hi Jan

Thank you for your help. I am pleased to attach a pdf file of the circuit.

Thanks
Albert

peranders · 24th October 2009, 12:50 PM

First of all, why do you want to match transistors? The question is for leading you to something else. Maybe you don't need to match at all?

jackinnj · 24th October 2009, 01:24 PM

Quote:

Originally Posted by peranders

First of all, why do you want to match transistors? The question is for leading you to something else. Maybe you don't need to match at all?

Perhaps he's using them for a current source -- nice to have them matched.

24th October 2009, 02:40 AM	#1
SSDIY diyAudio Member Join Date: Oct 2009 Location: Hong Kong	Question About Transistor Matching Hi I am new to this forum. I got the following transistor matching circuit from the internet it is quite simple and easy to build but the upper section (for NPN measurement) of the circuit has one 10K resistor connected between the two transistors while the lower section (for PNP measurement) has none. Would anyone please tell me is this a drawing mistake? Which one is correct? Thanks.

24th October 2009, 06:35 AM	#4
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 4	That is still the same size as the last posted image. dave __________________ community sites t-linespeakers.org, frugal-horn.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA

24th October 2009, 07:57 AM	#5
sandyK diyAudio Member Join Date: Apr 2007 Location: Sydney	Image size Planet10 I now have the same problem when posting images here, that are hosted by ImageShack. Even though the original picture may be quite large, since the DIYAudio upgrade, it is the thumbmail that is being used , instead of being able to use the clickable option for a large image. Perhaps as a Moderator, you may be able to find out why the original option no longer works. It certainly still functions in other forums. Regards SandyK

24th October 2009, 11:31 AM	#7
Jan Dupont diyAudio Member Join Date: Apr 2003 Location: Copenhagen, Denmark	Make a PDF file and attach that or email it to me..... __________________ Free Schematic and Service Manual downloads www.audio-circuit.dk, Company: www.dupont-audio.com, Joint venture: www.DupontMantra.com

24th October 2009, 12:50 PM	#9
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4	First of all, why do you want to match transistors? The question is for leading you to something else. Maybe you don't need to match at all? __________________ /Per-Anders (my first name) or P-A as my friends call me


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24th October 2009, 04:49 AM	#2
fritz39 diyAudio Member Join Date: Mar 2008 Location: Maple Valley, WA	Your picture is too small to see.

24th October 2009, 06:12 AM	#3
SSDIY diyAudio Member Join Date: Oct 2009 Location: Hong Kong	Try again

24th October 2009, 09:52 AM	#6
SSDIY diyAudio Member Join Date: Oct 2009 Location: Hong Kong	The original image is a Jpeg 100k file. It has been compressed when uploading to the thread. Could anyone help to post it with a bigger size if I send him the file?

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