Over-current protection in Audio IC Output Buffers

ppl · 6th October 2002, 07:29 AM

I am sure members of this Fourm are well aware of the Sonic damage Current limiting an Audio Amplifiers Output stage. I am licking to use a Buffer HA-5002 that lackes output protection. The data sheet recomendations of resistors in series with the Output Transistors supply. This degrades the sound alot. Using Current sources also is not good. so I am thinking Rail fusing. This Buffer allows the Output and driver stages to be seoparatly powered. If in the event of only one rail fuse Blowing how would one asure not large amounts of DC upon the Output. Thanks guys

johnferrier · 21st October 2003, 06:35 AM

My plan is to use an audio quality relay on the output and power the coil with the rails. So, if either fuse goes, the relay opens. Other reasons for me to use a relay is for other DC protection and turn on/off muting. (Actually, thinking of a five minute warm-up timer before the relay actuates. Or maybe using a temp sensor to turn on after warm up.)

JF

6th October 2002, 07:29 AM	#1
ppl diyAudio Member Join Date: Apr 2001 Location: Seattle, WA U.S.A.	Over-current protection in Audio IC Output Buffers I am sure members of this Fourm are well aware of the Sonic damage Current limiting an Audio Amplifiers Output stage. I am licking to use a Buffer HA-5002 that lackes output protection. The data sheet recomendations of resistors in series with the Output Transistors supply. This degrades the sound alot. Using Current sources also is not good. so I am thinking Rail fusing. This Buffer allows the Output and driver stages to be seoparatly powered. If in the event of only one rail fuse Blowing how would one asure not large amounts of DC upon the Output. Thanks guys

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
SMPS Current protection	kasiss	Power Supplies	25	12th August 2007 08:56 PM
fuses for smps current protection	eltonseemann	Power Supplies	18	7th August 2007 12:11 AM
DC current protection for speakers	medogrizli	Solid State	2	22nd October 2006 09:03 PM
opamp buffers power output q	PederBass	Solid State	3	8th October 2004 09:32 PM
Aleph 5 inrush current protection	vossie	Pass Labs	33	6th December 2002 02:36 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


	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

21st October 2003, 06:35 AM	#2
johnferrier diyAudio Member Join Date: Sep 2003 Location: WA	My plan is to use an audio quality relay on the output and power the coil with the rails. So, if either fuse goes, the relay opens. Other reasons for me to use a relay is for other DC protection and turn on/off muting. (Actually, thinking of a five minute warm-up timer before the relay actuates. Or maybe using a temp sensor to turn on after warm up.) JF