New to Chip Amps - Page 2

Juergen Knoop · 28th July 2007, 05:45 PM

Quote:

Originally posted by AndrewT

If you assume 24Vpk into a load from +-28Vdc supplies then the peak curent into 4r0 is 7A.

thats 100W peak power. Not enough?

AndrewT · 28th July 2007, 05:59 PM

Hi,
24Vpk into 4r0 is 50W.
A reactive speaker could have an effective impedance as low as 4*0.35=1.4ohms.
Now try sending that transient 24Vpk into 1.4ohms and the transient peak current could be as high as 17Apk. Except that National guarantees that spike protection has cut in long before then.

Juergen Knoop · 28th July 2007, 06:19 PM

Ho,
I used your 7A. P=7*7/2*4 A*A*Ohm=98W
with 24Vpk, P would be 24*24/(2*4) V*V/Ohm=72W not 50!
Neverless, by increasing the requirements at will and worstcasing everything, one could hunt every design down.
regards

AndrewT · 28th July 2007, 06:51 PM

obviously I can't even punch the right buttons on my calculator.

jackinnj · 28th July 2007, 07:15 PM

Quote:

Originally posted by AndrewT
obviously I can't even punch the right buttons on my calculator.

'hittin that thistle wine again, eehhhh?

28th July 2007, 05:59 PM	#12
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, 24Vpk into 4r0 is 50W. A reactive speaker could have an effective impedance as low as 4*0.35=1.4ohms. Now try sending that transient 24Vpk into 1.4ohms and the transient peak current could be as high as 17Apk. Except that National guarantees that spike protection has cut in long before then. __________________ regards Andrew T.

28th July 2007, 06:51 PM	#14
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	obviously I can't even punch the right buttons on my calculator. __________________ regards Andrew T.

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28th July 2007, 06:19 PM	#13
Juergen Knoop diyAudio Member Join Date: Jan 2007 Blog Entries: 3	Ho, I used your 7A. P=77/24 AAOhm=98W with 24Vpk, P would be 2424/(24) V*V/Ohm=72W not 50! Neverless, by increasing the requirements at will and worstcasing everything, one could hunt every design down. regards

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