Folsom's great little 7297 Chip Amp

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bentconvert

Re: Folsom's great little 7297 Chip Amp
« Reply #20 on: 5 Nov 2015, 07:36 pm »
Maybe it should be obvious but are the amp and PSU boards stereo or mono? Trying to determine if I need to order one or two of each for stereo.

Thanks,
Steve

Folsom

Re: Folsom's great little 7297 Chip Amp
« Reply #21 on: 5 Nov 2015, 07:42 pm »
The amp is stereo. You only need one of each.

lacro

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Re: Folsom's great little 7297 Chip Amp
« Reply #22 on: 5 Nov 2015, 09:04 pm »
Yes it does! I'll show you. Here's the parts for just the amplifier section (not including the capacitor multiplier, voltage regulator section)

Amp parts: Mouser      # of parts
TDA7297                                    511-TDA7297   1
330uf                                    667-25SEPF330M   12
47kohm                                    CFR16J47K   2
Vishay/Sprague 10uf                    75-515D106M035JA6AE3   1
input cap recommended            80-PHE426KF7150JR6L2    2
input bypass cap recommended   MKP1837322161G     2


What's the deal with the capacitor multiplier, voltage regulator section ? Is that populated on the same board?


Folsom

Re: Folsom's great little 7297 Chip Amp
« Reply #23 on: 5 Nov 2015, 09:11 pm »
What's the deal with the capacitor multiplier, voltage regulator section ? Is that populated on the same board?

Yes. You can see it at the bottom before the capacitor array.





Mmaxed

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Re: Folsom's great little 7297 Chip Amp
« Reply #24 on: 5 Nov 2015, 10:04 pm »
Ordered both.  Sounds like a fun project with good or better results, plus I felt a need to support a fellow Montanan even if he is in Missoula.


Folsom

Re: Folsom's great little 7297 Chip Amp
« Reply #25 on: 5 Nov 2015, 10:24 pm »
Ordered both.  Sounds like a fun project with good or better results, plus I felt a need to support a fellow Montanan even if he is in Missoula.

I must moved :oops: , but I've always wondered if there was anyone in Montana! If you're going to Missoula anytime PM me, I might be able to get you a little audition with a system that's got this amp in it.

Peter J

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  • Hmmmm
Re: Folsom's great little 7297 Chip Amp
« Reply #26 on: 5 Nov 2015, 10:58 pm »
Peter, you can buy several thousands of them from another place that carries NOS.

You have to have the transistor. I include it for free! Maybe I should check because I mean for it to not sound optional. It's from my personal stash (I have a lot, maybe 1000 or so). There's lots of replacements, but the one I have has better specifications.

I hope the future holds more DIY, for those that can't lay down real big stacks of cash on gear, but want to have something truly good.

Duh, I guess I should have looked a little closer at the offering, it is indeed spelled out.  Anyway, I'm in for both boards, looks like the Antipole is somewhat behind amp board in funding.

mikeeastman

Re: Folsom's great little 7297 Chip Amp
« Reply #27 on: 5 Nov 2015, 11:20 pm »
How do I order an antipole board?

Mmaxed

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Re: Folsom's great little 7297 Chip Amp
« Reply #28 on: 5 Nov 2015, 11:43 pm »
I must moved :oops: , but I've always wondered if there was anyone in Montana! If you're going to Missoula anytime PM me, I might be able to get you a little audition with a system that's got this amp in it.

Sorry, had to rib a little.  Thanks for the offer but don't get that way often except heading to ID to see the inlaws.  Usually a quick trip each way.  I will hear the amp when I get mine built.

By the way, what is the power of the amp?

Folsom

Re: Folsom's great little 7297 Chip Amp
« Reply #29 on: 5 Nov 2015, 11:56 pm »
15w , Danny Richie told me he thinks it sounds like 30w, maybe more. I'll confirm it sounds more like 15 tube watts.
« Last Edit: 6 Nov 2015, 07:41 am by Folsom »

Peter J

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Re: Folsom's great little 7297 Chip Amp
« Reply #30 on: 6 Nov 2015, 12:01 am »
How do I order an antipole board?

https://www.indiegogo.com/projects/antipole-pcb-filtered-psu#/

If you're ordering both, it looks like you should choose less expensive option and they'll ship together. That I read after pulling the trigger on the option including shipping.

Man, I just keep bumbling along here, hope that's not a harbinger of things to come...

mikeeastman

Re: Folsom's great little 7297 Chip Amp
« Reply #31 on: 6 Nov 2015, 12:32 am »
Thanks.

lacro

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Re: Folsom's great little 7297 Chip Amp
« Reply #32 on: 7 Nov 2015, 08:59 pm »
Yes. You can see it at the bottom before the capacitor array.





shadowlight

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Re: Folsom's great little 7297 Chip Amp
« Reply #33 on: 7 Nov 2015, 10:14 pm »
Is there a pcb available for power supply?

Folsom

Re: Folsom's great little 7297 Chip Amp
« Reply #34 on: 7 Nov 2015, 10:32 pm »


The transistor that feeds the DC to the supply capacitors and chip, controlled by the other transistor and TL431 for voltage regulation. The numbers and letters there punched into Mouser would have led you to one. It also requires a small heatsink on it.

Is there a pcb available for power supply?

shadowlight, yes, the Antipole that's posted in this thread.

Folsom

Re: Folsom's great little 7297 Chip Amp
« Reply #35 on: 7 Nov 2015, 10:54 pm »
Here's one in Ireland. I'll link to comments if he posts them publicly. (He says it's much more impressive than his Amp Camp Amp)



jtwrace

Re: Folsom's great little 7297 Chip Amp
« Reply #36 on: 8 Nov 2015, 02:50 am »
What's the excitation of the board requirement?

Folsom

Re: Folsom's great little 7297 Chip Amp
« Reply #37 on: 8 Nov 2015, 03:16 am »
What's the excitation of the board requirement?

?

jtwrace

Re: Folsom's great little 7297 Chip Amp
« Reply #38 on: 8 Nov 2015, 03:58 am »

Folsom

Re: Folsom's great little 7297 Chip Amp
« Reply #39 on: 8 Nov 2015, 06:57 am »
Battery power use 24v, SMPS can be as low as 21v, and transformer should be 16v to get rectified around 23-24v.