Hello a question for those who's built one.
I've followed Ryohei Kusunoki's design pretty closely. I've used 6 TDA1543 instead of 4 in parallel, and changed i/v conversion resistor to 400ohms and Rref at 240 ohms according to TDA1543calc utility floating around, driving with 8.5V supply.
Sound comes out. but there is something fishy going on.
I thought I've wired the blasted thing properly but DC voltage of left and right channel are different. the utility suggests 4.55V, but I get 4.25V on one channel and 4.7 on the other.
The mismatch is far too great in my mind to brush off as a chip to chip performance variation. And too small to be a failure of one of the chip's output.
A question for those of you out there who's played around with this chip. Has anyone experienced this behavior?
-Cusa
I've followed Ryohei Kusunoki's design pretty closely. I've used 6 TDA1543 instead of 4 in parallel, and changed i/v conversion resistor to 400ohms and Rref at 240 ohms according to TDA1543calc utility floating around, driving with 8.5V supply.
Sound comes out. but there is something fishy going on.
I thought I've wired the blasted thing properly but DC voltage of left and right channel are different. the utility suggests 4.55V, but I get 4.25V on one channel and 4.7 on the other.
The mismatch is far too great in my mind to brush off as a chip to chip performance variation. And too small to be a failure of one of the chip's output.
A question for those of you out there who's played around with this chip. Has anyone experienced this behavior?
-Cusa
- Status
- This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.