How to parallel P3A output transistor?

Jay · 25th March 2011, 03:21 PM

I'm using small package transistors for my P3A, and I want to add another pair. How can I parallel these transistors?

Thanks

jaycee · 25th March 2011, 06:16 PM

0.1 ohm 3W resistors in the emitters of both pairs.

Bone · 25th March 2011, 06:32 PM

Look at Rod's P27 power amplifier.

lineup · 25th March 2011, 07:16 PM

Jay · 26th March 2011, 12:56 AM

Like this? Or?

Will there any increase in power?

ReiMomo · 26th March 2011, 03:04 AM

R13s goes to emitter side.

Ian Finch · 26th March 2011, 07:08 AM

Guys, you are all but publishing Rod's schematics here. It might make it easy to teach with the full, unpublished diagrams and make it easy for cloners but it's his business and not your IP.

lineup · 26th March 2011, 08:13 AM

I think he is glad anyone is interested in his his amplifiers.
Image is just a link to his site.

lineup · 26th March 2011, 08:48 AM

Quote:

Originally Posted by Jay

Like this? Or?

Will there any increase in power?

You have confused emitter and collector.
Best use 0.470 or 0.330 Ohm

Ian Finch · 26th March 2011, 10:15 AM

Apologies guys, you are right Lineup, as Rod now shows part values on his designs.

25th March 2011, 03:21 PM	#1
Jay diyAudio Member Join Date: Feb 2003 Location: Jakarta	How to parallel P3A output transistor? I'm using small package transistors for my P3A, and I want to add another pair. How can I parallel these transistors? Thanks

25th March 2011, 07:16 PM	#4
lineup diyAudio Member Join Date: Dec 2005 Location: the north	__________________ lineup

26th March 2011, 07:08 AM	#7
Ian Finch diyAudio Member Join Date: Apr 2010 Location: Coffs Harbour, on the east coast	Guys, you are all but publishing Rod's schematics here. It might make it easy to teach with the full, unpublished diagrams and make it easy for cloners but it's his business and not your IP. __________________ regards

26th March 2011, 08:13 AM	#8
lineup diyAudio Member Join Date: Dec 2005 Location: the north	I think he is glad anyone is interested in his his amplifiers. Image is just a link to his site. __________________ lineup

26th March 2011, 10:15 AM	#10
Ian Finch diyAudio Member Join Date: Apr 2010 Location: Coffs Harbour, on the east coast	Apologies guys, you are right Lineup, as Rod now shows part values on his designs. __________________ regards


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

25th March 2011, 06:16 PM	#2
jaycee diyAudio Member Join Date: Apr 2004 Location: Norwich, UK	0.1 ohm 3W resistors in the emitters of both pairs.

25th March 2011, 06:32 PM	#3
Bone diyAudio Member Join Date: Jun 2004 Location: Dorset, UK	Look at Rod's P27 power amplifier.

26th March 2011, 03:04 AM	#6
ReiMomo diyAudio Member Join Date: Apr 2008 Location: Puerto Rico	R13s goes to emitter side.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Transistor choice for P3A	ChrisJennings	Solid State	14	10th July 2011 05:00 AM
Parallel output transistor matching	AW-tech	Solid State	8	29th November 2009 02:42 AM
Parallel or Transistor assisted chip amp ?	ashok	Chip Amps	39	15th September 2008 12:41 AM
Can bias transistor mount on top(body) of output transistor??	Leolabs	Solid State	23	16th February 2008 12:35 AM
LM317 with a parallel transistor for current?	Progg70	Power Supplies	2	31st August 2005 05:01 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read