Help identifying this car audio amplifier IC - Page 1
Forum section: electronics / repair

author: cellularmitosis
author_rank: Unknown
timestamp: July 07, 2015, 04:02:38 am
content: Hi,I'm trying to add a line-in jack to an old car stereo (which has a busted tape player and radio), like the post-apocalyptic-inventor does here:I'm trying to track down a datasheet for what appears to be a pair of main power amplifier chips.They have the following markings:(Philips logo)TAIWAN04652713N62013HSH9627 1I've attached a photo as well.Anyone have any idea how to construct a part number out of those markings?

author: cellularmitosis
author_rank: Unknown
timestamp: July 07, 2015, 04:06:21 am
content: This is out of a 1997 Dodge Ram, so "HSH9627" is probably 27th week of 1996.

author: cellularmitosis
author_rank: Unknown
timestamp: July 07, 2015, 04:10:26 am
content: I also see a 16-DIP chip from ST micro with part number 4652715, so "465271X" is probably a series house part numbers.

author: mikerj
author_rank: Super Contributor
timestamp: July 07, 2015, 09:17:14 am
content: Quote from: cellularmitosis on July 07, 2015, 04:10:26 amYep, if this is an OEM headunit (i.e. factory fitted by Dodge) then it's almost certain to be a Dodge part number. The device itself will be a standard part, you just need to hit the Philips datasheets and see if you can match up the pinout (it will almost certainly be a TDAxxxx).

author: BennVenn
author_rank: Regular Contributor
timestamp: July 07, 2015, 10:57:50 am
content: Just probe around in there with a tone generator till you find a suitable injection point?

author: cellularmitosis
author_rank: Unknown
timestamp: July 07, 2015, 01:55:26 pm
content: Good ideas ok both counts guys!

author: Deathwish
author_rank: Unknown
timestamp: July 07, 2015, 04:36:57 pm
content: what is the make and model of the ICE if it isnt a stupid question, do dodge make their own ?

author: cellularmitosis
author_rank: Unknown
timestamp: July 08, 2015, 03:37:42 am
content: Quote from: Deathwish on July 07, 2015, 04:36:57 pmBy ICE, do you mean Internal Combustion Engine? Dodge doesn't make it, they buy diesel engines from Cummins (it's a Cummins 6BTA). The truck is a 1997 Dodge Ram 2500.

author: Deathwish
author_rank: Unknown
timestamp: July 08, 2015, 06:37:58 am
content: ICE = In Car Entertainment. The stereo, the head unit or whatever you like to call it your way.

author: cellularmitosis
author_rank: Unknown
timestamp: July 09, 2015, 02:45:16 am
content: Welp, I probed the pins of the amplifier IC's with an oscilloscope, then poked around with a capacitively coupled signal generator. I was able to get an amplified tone out of one of the channels, but then accidentally shorted two pins and it appears I have taken out the entire amp...I've ordered a cheap class D amplifier board from china, have gutted the original electronics out of the stereo unit, and will hack the class D amp (with a line-in jack) into the stereo unit when it arrives.

author: coromonadalix
author_rank: Super Contributor
timestamp: July 28, 2015, 03:43:46 am
content: check for tda1552 tda1558 etc .... since it is your audio amp outputThose are rebranded numbers chips to camouflage the real numbers.

author: coromonadalix
author_rank: Super Contributor
timestamp: July 28, 2015, 03:47:19 am
content: The best way to add input is near the volume control circuit, take an 3.5 mm jack with cut off switches, and you have to connect this before the volume control circuit, maybe add some capacitors in line for isolation and or add trimpots to adjust it to a convenable volume.

author: Richard Crowley
author_rank: Super Contributor
timestamp: July 28, 2015, 04:27:53 am
content: Quote from: coromonadalix on July 28, 2015, 03:47:19 amYes, absolutely. It makes no difference what kind of amplifier IC the gadget uses.The insertion point is well BEFORE the power amp chip.