Further to my last post, or are you joining both takeup power sets at the chip and using only one 100nF cap there? This would look more like the spec sheet schematic.
http://www.tehnari.ru/attachments/f114/12015d1271223569-tda1557q.jpg
that is all you need.
I do not understand "2 power pickup" statement.
All i see is a single 12 volt rail, and a ground.
change only the input cap values to something bigger.
past 470 nF not much will change.
that is all you need.
I do not understand "2 power pickup" statement.
All i see is a single 12 volt rail, and a ground.
change only the input cap values to something bigger.
past 470 nF not much will change.
Plain and clear Arty, What I meant was that pin 3 and 5 form one pair and pin 10 and 8 the second pair of + and Gnd, if you see the schema I posted some pages back you will see what I mean.
Will try that configutation you linked on your last post.
Will try that configutation you linked on your last post.
ah, you connect those as the last posted setup shows.
i get it now.
just try to build it as the picture shows,
no pcb or other voodoo magic.
i allready told you once, first make it work.
then tune it.
i get it now.
just try to build it as the picture shows,
no pcb or other voodoo magic.
i allready told you once, first make it work.
then tune it.
TDA7297
After a while since my last post, this is what I have brewing at home lately… as before low wattage chipamps on a BTL configuration say 10 /15 W this time TDA7297 from STM for which I have made 2 slightly different PCB’s for a cleaner testing rig and planning for a third incarnation to include small implementation details that have been rising during testing. Also did another PCB for the supply almost identical as before on a CLC configuration which gives around 13.7V loaded.
Here is a pic of the actual implementation
After a while since my last post, this is what I have brewing at home lately… as before low wattage chipamps on a BTL configuration say 10 /15 W this time TDA7297 from STM for which I have made 2 slightly different PCB’s for a cleaner testing rig and planning for a third incarnation to include small implementation details that have been rising during testing. Also did another PCB for the supply almost identical as before on a CLC configuration which gives around 13.7V loaded.
Here is a pic of the actual implementation
Attachments
More or less a joke. Optimization of a circuit, that is 45 years old this year. After several small mods, it is far better than the original. I was just curious 🙂
The big question in all this, is how much better even a very basic piece of electronics can get, without radically altering its fundamental makeup? All my experimenting has demonstrated, providing you know exactly what you're aiming for, results vastly more impressive than most would expect - most certainly, highly satisfying sound can be achieved, usually far superior to the majority of "high end" audio setups ...
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same here.-
i usually just build a basic, well known to work version.
then, see what is wrong with it.
not hard to tweek them up a bit.
i usually just build a basic, well known to work version.
then, see what is wrong with it.
not hard to tweek them up a bit.
Yes it does, I’m up to the third generation with optimization details on the pcb and all in a box now and since it is a PC setup I have no input pot there.
Soundwise is good but not what I expected maybe the 1553 will bring the air at HF I’m longing for. Still pending is a working setup with the 1553.
Antonio
🙂
Lack of air at HF is often an interference artifact - have you done experiments where you shut off everything electrical near the unit, to give it clear air to breath in, so to speak - see if that makes a difference ... ?
over 3 watt output at 8ohm load, according to the datasheet,
the 7297 does not behave nicely , specialy as freq. increases.
the 7297 does not behave nicely , specialy as freq. increases.
Did check on that, but there is no change soundwise. Will see if other chips are better on this regard, still thinking on the 1553 could be the ansewer.
Which would be your take for an all-around chip which provides a good HF behavior?
Yes, it seems that the 7297 wasn’t a good pick.
hmm, let me see..
TDA7293 was a very good performer, not the typical 5 minute chipamp 😀
There are several tda7293/94 point to point guides on these forums with images 😀
TDA7293 was a very good performer, not the typical 5 minute chipamp 😀
There are several tda7293/94 point to point guides on these forums with images 😀
Gee man that’s a powerhouse!
Sorry my fault, should have been more specific with my question just wanting to drive my flimsy 4 or 8 Ohm spikas on the 2 to 3” dia as Fullranger close field arrangement. If single supply is possible better still.
Anyway, thanks for your input! 🙂
tda2052 is allso good up to 15 watts,
single supply ones.. well, i think it can be built for single supply.
http://www.diyaudio.com/forums/power-supplies/120401-power-supply-issue.html
like this.
depending on Your power needs, maybe some paralelled opamps could do the trick too,
but i would not shoot for that.
lm1875 comes to mind too,
and a class-H tda chip, but that would be rare to find, and darn expensive...
most probably if low power stuff is all You want, then You could try to force an opamp into class A with Jfet cascode, and add some more capable power stage, but that would not be a real chip amp 😀
single supply ones.. well, i think it can be built for single supply.
http://www.diyaudio.com/forums/power-supplies/120401-power-supply-issue.html
like this.
depending on Your power needs, maybe some paralelled opamps could do the trick too,
but i would not shoot for that.
lm1875 comes to mind too,
and a class-H tda chip, but that would be rare to find, and darn expensive...
most probably if low power stuff is all You want, then You could try to force an opamp into class A with Jfet cascode, and add some more capable power stage, but that would not be a real chip amp 😀
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