Author Topic: Speaker and TDA7502 getting warm  (Read 2635 times)

bartleph

  • Jr. Member
  • *
  • Posts: 11
    • View Profile
    • Email
Speaker and TDA7502 getting warm
« on: November 16, 2013, 04:04:59 PM »
Hi,
I have my two boards built now and all appears to be working fine apart from sound and sound recording. I have noticed that the speakers and TDA7052s on both boards are getting uncomfortably hot.  Any ideas please?

berk

  • Veteran
  • *****
  • Posts: 387
    • View Profile
    • funwithelectrons.blogspot.com
Re: Speaker and TDA7502 getting warm
« Reply #1 on: November 18, 2013, 04:12:13 AM »
Hi bartelph
  If you are using Jims ready made boards then all should be OK. Try checking the orientation of the ISD1790 and the TDA chips.
Post a pic of the component side of the board.

radm

  • Full Member
  • **
  • Posts: 60
    • View Profile
Re: Speaker and TDA7502 getting warm
« Reply #2 on: November 18, 2013, 06:44:21 AM »
Hi bartelph

It's important to check that the PIC is the TDA7502A (with "A"), as the TDA7502 (without "A"), hasn't volume control, and one of the contacts is useless, but he would be receiving power, which causes the warming.

bartleph

  • Jr. Member
  • *
  • Posts: 11
    • View Profile
    • Email
Re: Speaker and TDA7502 getting warm
« Reply #3 on: November 26, 2013, 02:57:23 PM »
Bingo radm,
That was it.... I have used the wrong version of the TDA7502... and I also didnt bother with an IC socket on that chip...
I managed to break the old chip up on the board, just leaving the eight legs still soldered into the board. After pulling them all out managed to get a new IC socket in and the new chips work fine. Many Thanks.