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-   -   Lm4702 (http://www.diyaudio.com/forums/chip-amps/66593-lm4702.html)

Ipanema 24th October 2005 08:01 AM

Lm4702
 
Hi,

Is this any good?

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

A new toy for christmas, boy! :D

AmA 24th October 2005 10:03 AM

... wow ...:bigeyes:

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).


:bigeyes: 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).


:bigeyes: 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...


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