Lm4702

[jackinnj]

Originally posted by monkey29
new LM4702 + SAP15

I've been trying to get the replacement for the SAP15 which is rendered obsolete by the manufacturer.

[ttan98]

jackinnj ,

any difference in sound quality between mosfet and sanken, sap(I presume)? or just for individual taste?

I ask you this question in my last email, so far no response from you.

thanks

[jackinnj]

I was at a graduation in Pittsburgh -- I don't know how you can describe it in words as I am not a reviewer for Stereophile -- the MOSFET version is really excellent -- I stopped working with the SAP devices when they were discontinued -- and I haven't been able to source samples in the U.S. If and when I get some samples I will do more work with the Sanken products.

I've been playing around with a totem driver for the less expensive IRF-Vishay HexFETS -- works as a prototype so I had some burned.

[monkey29]

Originally posted by jackinnj


I've been trying to get the replacement for the SAP15 which is rendered obsolete by the manufacturer.

Different output stage and have different voice colors, Different people have different interpretations.

[ttan98]

monkey59,

I agree with, maybe someone write a summary on the comparison. It would be interesting.

[monkey29]

Different voice characteristics, composition of the wonderful world of voice.
I understand that this is a DIY audio spirit. Thanks.

[SpittinLLama]

Looks like this appeared on the 28th but I just noticed it today:

http://www.national.com/pf/LM/LME49810.html

LME49830, mono driver, same 200V ability but with 60mA output current, a Baker clamp and a clip indicator. I'm not sure what exactly a Baker clamp is (besides reading a wiki). Clip indicator might be nice for DIY or I guess you could use it for some sort of control. Wonder how this sounds compared to the LM4702.

Also found a new LM4702 app note (May 24th): Found it here:

http://www.national.com/apnotes/Audi..._150V__v1.html

Since some are using are trying to use FETs with the LM4702 it might be of interest.

-SL

[jackinnj]

These two articles are well worth reading...will anxiously await the forthcoming article on compensating the LM4702.

...and again, I don't want the LM4702 heatsinked on the same piece of aluminum as the output devices.

[Nordic]

Can't wait to test one of these...

General Description

--------------------------------------------------------------------------------

The LME49810 is a high fidelity audio power amplifier driver designed for demanding consumer and pro-audio applications. Amplifier output power may be scaled by changing the supply voltage and number of power transistors. The LME49810¡¯s minimum output current is 50mA. When using a discrete output stage the LME49810 is capable of delivering in excess of 300 watts into a single-ended 8§Ù load.

Unique to the LME49810 is an internal Baker Clamp. This clamp insures that the amplifier output does not saturate when over driven. The resultant ¡°soft clipping¡± of high level audio signals suppresses undesirable audio artifacts generated when conventional solid state amplifiers are driven hard into clipping.

The LME49810 includes thermal shutdown circuitry that activates when the die temperature exceeds 150¡ÆC. The LME49810¡¯s mute function, when activated, mutes the input drive signal and forces the amplifier output to a quiescent state.

[glennb]

Originally posted by SpittinLLama
Looks like this appeared on the 28th but I just noticed it today:
http://www.national.com/pf/LM/LME49810.html

(sic) LME49830, mono driver, same 200V ability but with 60mA output current, a Baker clamp and a clip indicator. I'm not sure what exactly a Baker clamp is (besides reading a wiki). Clip indicator might be nice for DIY or I guess you could use it for some sort of control. Wonder how this sounds compared to the LM4702.
-SL

I started a new thread on the LME49810 at LME49810 - a new cousin for LM4702