TDA 7293 power supply?

[FLS]

I purchased a TDA 7293 amp off ebay. It say's it needs 12 to 32 volts AC. I want to try it in automotive application. From the input block it goes directly to a bridge rectifier. Could I remove rectifier and use DC? If so,the input block is labeled AC O AC,would it be wired + - +,or +DC G -DC? Is there a conversion table for AC to DC or DC to AC power requirements? Any help would be greatly appreciated.Thanks

 

[Arouse1973]

Yes you can run from DC after all that's what the bridge circuit does. Can you take a picture of the circuit including the bridge rectifier? Welcome to EP BTW
Adam

 

[kellys_eye]

If the input shows AC- ZERO and AC then you need a centre-tapped transformer.

You can connect DC if you know the correct voltage required - it would wire (basically) across the main smoothing capacitors and would (presumably) need to be a 'split-rail' supply.

 

[Bluejets]

Split supply requirement pretty much rules out use in auto. Not to mention that although it operates @ 12v-+ min it really is a high voltage amp up to 50v-+. I think you will find plenty of ready made amp modules on Ebay, most modules being close to or less than the cost of individual amp chip.

 

[davenn]

Any help would be greatly appreciated.Thanks

As Adam asked in post #2 ... please supply a photo or 2 of the board and if possible a circuit diagram


(also ... I deleted you last post as it was empty other than your own quote, making it a pointless post)

 

[FLS]

I keep getting a error when I try to up load pics

 

[FLS]

It is a amp module.trying to upload pics now keep getting error message.It is item #272693120983 since I can't seem to upload pics.Iam new to the site .This is a little background on me.lm a journeyman electrician that dabbles in electronics.I pretty much know the different comp.and if I can physically see a issue I can soldier a new component in and it works a lot of the time.But I am trying to learn electronics and coding.Thank you

 

[kellys_eye]

OK, I've seen the eBay pictures and, as suspected, the supply is indeed AC-0-AC and therefore a 'spit-rail' requirement that cannot be found in an automotive system.

You only option using this board would be to use an inverter to derive the AC and feed that to a suitable transformer which then powers the amplifier - clearly an unsatisfactory method.

Personally I'd look around for another amplifier module that operates on a single rail supply like this class-D module:

http://www.ebay.co.uk/itm/TPA3116-D...635957?hash=item4d51e7edb5:g:8p0AAOSwdzVXux8Y

You could also look for a SMPS module that has a 12V DC input and a split rail output - but I've only seen schematics for those at the currents you'll require. You'd have to build your own.

 

[davenn]

I keep getting a error when I try to up load pics

use .jpg files
resize to a maximum of 1024 x 768 and a max of around 100 kb

 

[FLS]

Well it sounds like maybe I will head in another direction.Maybe a pair of powered bookshelf speakers. Split rail? That's + and --.Thankyou everyone! If any other suggestions( projects or learning literature)fill free to let me know.I'm all ears!