Thoughts on the Sanyo STK3102III amp chip?

[Adrian]

Provided Link: sanyo chip at MCM (http://mcm.newark.com/NewarkWebCommerce/mcm/en_US/endecaSearch/partDetail.jsp;jsessionid=NU2SZEAWJDZBWCXFEOESFGAK 2URYWIV1?SKU=STK3102III&N=0)


I ran across this chip and it does 100W per channel. Its 2 channel and it is tempting to play with for the price. So, has anyone played with it and have any oninions?

Adrian

[Adrian]

<A HREF="http://alfa.iele.polsl.gliwice.pl/elenota/Sanyo/stk3102iii.pdf">http://alfa.iele.polsl.gliwice.pl/elenota/Sanyo/stk3102iii.pdf</A>

[envisionelec]

> I ran across this chip and it does 100W per
> channel. Its 2 channel and it is tempting to
> play with for the price. So, has anyone
> played with it and have any oninions?

> Adrian

"STICK" chips in general sound very good with the right implementation. I used to play with them when "chipamps" weren't popular. They key to good sound with them is correct compensation (RF blocking) and appropriate gain. To little gain, I've found, and you increase your chances for oscillation. Weird, but I've seen corroborative evidence for this at the DIYAudio site.

Don't be tempted to run them in high biased Class AB mode, as Technics did for years (new Class A). They'll just get hot and burn up faster.

Good stuff, though, I'm interested to see what you come up with!

[wg_ski]

> "STICK" chips in general sound
> very good with the right implementation. I
> used to play with them when
> "chipamps" weren't popular. They
> key to good sound with them is correct
> compensation (RF blocking) and appropriate
> gain. To little gain, I've found, and you
> increase your chances for oscillation.
> Weird, but I've seen corroborative evidence
> for this at the DIYAudio site.

Not weird at all - true for ANY feedback amplifier. Too little closed loop gain (too much signal fed back) and it will sing. True of discretes, op-amps, and the popular gainclone chips too.

> Don't be tempted to run them in high biased
> Class AB mode, as Technics did for years
> (new Class A). They'll just get hot and burn
> up faster.

Lots of recievers from that vintage used STK modules for the low-level stages and discrete output transistors. These amps were more reliable and could be called "discrete" in the day when that was a selling point. STK3062 and its variants were widely used.