Input Transistors...

hawkfeather · 24th January 2006, 12:34 PM

Could a TO225/Case 77 type transistor such as the BD135-139 types be used as input trannies in a general 50-80V design, or must the wattage remain in the 1W range of TO92 packages?

Stocker · 24th January 2006, 01:18 PM

Input transistors are usually chosen for their electrical performance, not the packaging. If a transistor performs suitably for your design, use it.

You will quite possibly catch some flak for using those particular devices though.

quasi · 24th January 2006, 02:02 PM

No reason why you couldn't and the amp will work. In almost all cases though the lower noise - higher gain transistors are only available in the smaller packages.

Cheers

24th January 2006, 12:34 PM	#1
hawkfeather diyAudio Member Join Date: Dec 2005 Location: PA	Input Transistors... Could a TO225/Case 77 type transistor such as the BD135-139 types be used as input trannies in a general 50-80V design, or must the wattage remain in the 1W range of TO92 packages? __________________ Is it not better to burn out, than to fade away?

24th January 2006, 01:18 PM	#2
Stocker diyAudio Member Join Date: Dec 2003 Location: Austin	Input transistors are usually chosen for their electrical performance, not the packaging. If a transistor performs suitably for your design, use it. You will quite possibly catch some flak for using those particular devices though. __________________ Jesus loves you.

24th January 2006, 02:02 PM	#3
quasi diyAudio Member Join Date: Sep 2004 Location: Adelaide, Australia	No reason why you couldn't and the amp will work. In almost all cases though the lower noise - higher gain transistors are only available in the smaller packages. Cheers __________________ http://sites.google.com/site/quasisdiyaudiosite/

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