When the night comes, it’s a good time to listen some musics while summing up today’s work 😉
So here is the shoot of ASUS Xonar Essence One DAC section. It could be my final call for now.
I use only my Nokia Lumia 920 which is (not) surprisingly produces decent image quality. A bit over exposure on the white section (my mistake as I adjusted the exposure compensation on this shoot).
LME 49720 surprisingly good on LPF section, although running a bit hot – sound improves when it’s hot actually rather then when it’s cool. I think no oscillation there – need to confirm with my scope later. And the final stage is still my favorite, AD825.
The I/V has been changed to LME 49860 which is also quite interesting sound opamp.
Don’t ask me about that white rounded stuff.
Some more opamps to go perhaps, later…
Agus
May 31, 2013 07:18Pagi Ko,
Mantep banget. kalau pengalamanku, kaleng biasa di suhu 55-60 C ok… ga ada masalah sudah lebih dari 2 tahun
Salam 🙂
Quaintative
June 1, 2013 01:18Looks amazing! Wonder what it sounds like!
Auw Jimmy
June 1, 2013 05:21Good! But I will put some more mods before it’s ready to go to the real battle.
Thanks.
triodethom
June 2, 2013 21:18Have you tried heat sinking the lme 49720 yet ?
Auw Jimmy
June 2, 2013 22:49Not yet, but I like them when they are hot so far. Sounds bad when it’s cold.
So far their temperature is under control. Need to bring my thermometer to get exact value. I can touch it without feeling any burning sensation. Yes, finger is a bad measurement tool, but I can live with it.
Thanks.
triodethom
June 3, 2013 00:39Touch will put you in the range of ok temp . How long can you touch it before it feels hot? Five to ten second no need for heat sink. However the heat sink should help stabilize temp long term . With solid state devices I have found that the heat is from bias and to a point always sound better warm to very warm rather than cold. The bias reduces 2rd,3rd,4th order harmonic to level very low.
anonym
June 3, 2013 02:26Hi all … sorry to interrupting
I had a pairs of lme49720ha on my asus xonar essence STX sound card opamp.
Believe me or not it might get temperature about 70 – 80 or more degrees celsius which I can’t touch it more than 1 second. It really hot and burning my thumb
But it still working perfectly after more than 3 years ago I put it in. So I think its hot temperature is normal for this kind opamp.
triodethom
June 3, 2013 06:30Call me one who errors on the side of safety but above 55c is in needs to be using a heat sink for really long life. On sound cards five years is about 2 life times . Regards
Auw Jimmy
June 3, 2013 11:00Hi,
If you see 70-80 degrees, I think something must be done wrong there. Oscillation, perhaps?
I don’t really like something too hot like that (except when eating soup), as surely that temperature will impact the lifetime.
Thanks.
anonym
June 3, 2013 13:51From its datasheet said it can handled range -40c to 85c degrees … so I think it must be still in its normal operational range.
It might an oscillation or other causes but what I did just swap its opamp like others change theirs too with same type I had.
Ha ha ha … I know I’m wrong in this story side. But I’m too lazy too find out what’s wrong with my sound card just because it still operate normally and sounds so good … for so long time already.
Thanks for your opinion
triodethom
June 4, 2013 08:18That is very close to the edge of the SOA . Let us know how long it lasts.
Ahmad Audi
June 13, 2013 12:40MantapPakJimmy
itu yang di dekat opamp music snap bukan ?
Auw Jimmy
June 13, 2013 14:29Benar, Pak Ahmad…
Felix
June 29, 2013 11:06Bro, di milis ada nyari heatsink, ane ada beberapa buat to99 nih. Ane beli juga buat lme49720ha wkwk..
Kalo minat contact ane aja, di 081234527149
Thanks.
Auw Jimmy
June 30, 2013 22:11Thanks Bro… Saya uda pesen juga, tinggal nunggu sampe nya aja.