Lm4702

Ipanema · 24th October 2005, 08:01 AM

Hi,

Is this any good?

http://www.national.com/pf/LM/LM4702.html

A new toy for christmas, boy!

AmA · 24th October 2005, 10:03 AM

... wow ...

MikeLewis · 24th October 2005, 02:42 PM

holy crap..... I found my next project when I'm done with my 10 channel 3886 NIGC.

MikeLewis · 24th October 2005, 02:44 PM

cr@p is a blocked word?

jaudio · 24th October 2005, 04:11 PM

"I found my next project" Me too. I was thinking of using mosfet instead of darington.

Gcollier · 24th October 2005, 05:44 PM

There a bit of a lead time on these little puppies. I have had a few on order for a couple of weeks now. Anyone have suggestions as to what to use for the darlingtons on the source/sink pins. This will give me an excuse to use those XFO's that I have sitting around that put out too much voltage for a GC. Should be F.U.N!

G.

pinkmouse · 24th October 2005, 06:15 PM

That does look very interesting.

However, this looks much more fun!

MikeLewis · 24th October 2005, 09:19 PM

From the Spec Sheet:

POWER DISSIPATION AND HEAT SINKING
When in “play” mode, the LM4702 draws a constant amount
of current, regardless of the input signal amplitude. Consequently,
the power dissipation is constant for a given supply
voltage and can be computed with the equation PDMAX = Icc
* (Vcc – Vee). For a quick calculation of PDMAX, approximate
the current to be 25mA and multiply it by the total supply
voltage (the current varies slightly from this value over the
operating range).

Constant power draw? This sounds like it's going to be a real hog. Is this Class A?

Gcollier · 24th October 2005, 11:06 PM

Quote:

Originally posted by MikeLewis
From the Spec Sheet:

POWER DISSIPATION AND HEAT SINKING
When in “play” mode, the LM4702 draws a constant amount
of current, regardless of the input signal amplitude. Consequently,
the power dissipation is constant for a given supply
voltage and can be computed with the equation PDMAX = Icc
* (Vcc – Vee). For a quick calculation of PDMAX, approximate
the current to be 25mA and multiply it by the total supply
voltage (the current varies slightly from this value over the
operating range).

Constant power draw? This sounds like it's going to be a real hog. Is this Class A?

Sounds that way. can't wait until I get my samples. I could use a little help with some suggestion for the Darlingtons.

G.

aletheian · 24th October 2005, 11:56 PM

HOLY COW! I'm ordering a pair right now...and maybe bye bye bridged 4780...

24th October 2005, 08:01 AM	#1
Ipanema diyAudio Member Join Date: Jun 2004 Location: KL	Lm4702 Hi, Is this any good? http://www.national.com/pf/LM/LM4702.html A new toy for christmas, boy!

24th October 2005, 05:44 PM	#6
Gcollier diyAudio Member Join Date: Mar 2003 Location: Windsor	There a bit of a lead time on these little puppies. I have had a few on order for a couple of weeks now. Anyone have suggestions as to what to use for the darlingtons on the source/sink pins. This will give me an excuse to use those XFO's that I have sitting around that put out too much voltage for a GC. Should be F.U.N! G. __________________ If you take something apart and put it back together again enough times, eventually you will have two of them.

24th October 2005, 06:15 PM	#7
pinkmouse diyAudio Moderator Join Date: Apr 2002 Location: Chatham, England	That does look very interesting. However, this looks much more fun! __________________ Al I conceive of nothing, in religion, science or philosophy, that is more than the proper thing to wear, for a while. Charles Fort

24th October 2005, 11:56 PM	#10
aletheian diyAudio Member Join Date: Apr 2004 Location: Philly	HOLY COW! I'm ordering a pair right now...and maybe bye bye bridged 4780... __________________ Heghlu'meH QaQ jajvam!

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24th October 2005, 10:03 AM	#2
AmA diyAudio Member Join Date: Feb 2005 Location: Lille	... wow ...

24th October 2005, 02:42 PM	#3
MikeLewis diyAudio Member Join Date: Aug 2005	holy crap..... I found my next project when I'm done with my 10 channel 3886 NIGC.

24th October 2005, 02:44 PM	#4
MikeLewis diyAudio Member Join Date: Aug 2005	cr@p is a blocked word?

24th October 2005, 04:11 PM	#5
jaudio diyAudio Member Join Date: Oct 2004	"I found my next project" Me too. I was thinking of using mosfet instead of darington.

24th October 2005, 09:19 PM	#8
MikeLewis diyAudio Member Join Date: Aug 2005	From the Spec Sheet: POWER DISSIPATION AND HEAT SINKING When in “play” mode, the LM4702 draws a constant amount of current, regardless of the input signal amplitude. Consequently, the power dissipation is constant for a given supply voltage and can be computed with the equation PDMAX = Icc * (Vcc – Vee). For a quick calculation of PDMAX, approximate the current to be 25mA and multiply it by the total supply voltage (the current varies slightly from this value over the operating range). Constant power draw? This sounds like it's going to be a real hog. Is this Class A?

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