Hey guys been trolling for awhile and just got up the guts to build my first chip amp.
I have a 150va with a 58 vct which means that I could have +/- 40 v rails? What could I use it for ?
I can use more than 1 transformer which means that I could have +/- 81.2 v rails?
I was thinking a lm4702 but is it a bit too low or too high?
What do you guys think that I could build?
Thanks in advance
-Cam
I have a 150va with a 58 vct which means that I could have +/- 40 v rails? What could I use it for ?
I can use more than 1 transformer which means that I could have +/- 81.2 v rails?
I was thinking a lm4702 but is it a bit too low or too high?
What do you guys think that I could build?
Thanks in advance
-Cam
i believe that's the max for TDA7293 (100W capable but if making a stereo Amp you wont get quite that high...)
you can also get some regulator's (LM338, LT1083 etc...and bring it down a bit
then you could use the lm3886 (68W chip, +/- 35 i think for 8 ohm)
or you can always wander over to the solid state crowd... with 80 volt rails you could really start doing some damage to speakers... 😉
just my 2 cents
Dave
you can also get some regulator's (LM338, LT1083 etc...and bring it down a bit
then you could use the lm3886 (68W chip, +/- 35 i think for 8 ohm)
or you can always wander over to the solid state crowd... with 80 volt rails you could really start doing some damage to speakers... 😉
just my 2 cents
Dave
If you use 8 Ohm speakers and invest in a good heatsink, you can run LM3886 from those transformers. The DC voltage will sag sufficiently to remain within the IC's specs, when loaded.
The TDA7293 or TDA7294 are a bit more demanding, when it comes to a good layout, while the LM3886 is quite forgiving in that regard.
The LM4702 is probably not a good choice for a first project. Even, if you make an exact copy of a proven project, you should have some experience in amplifier building. And you will need good and expensive measuring equipment, e. g. an oscilloscope, for the final tests before connecting a speaker to it.
The TDA7293 or TDA7294 are a bit more demanding, when it comes to a good layout, while the LM3886 is quite forgiving in that regard.
The LM4702 is probably not a good choice for a first project. Even, if you make an exact copy of a proven project, you should have some experience in amplifier building. And you will need good and expensive measuring equipment, e. g. an oscilloscope, for the final tests before connecting a speaker to it.
I use a 56v CT 200Va Transformer (Puts out +/-42v DC unloaded) with a TDA7293 in my DIY guitar amp , it works great and is freaking loud...
I just used the PCB design in the Datasheet and it worked fine , I bypassed the Anti-Turn on Thump feature so there is a small thump when you turn the amp on but it doesn"t bug me...
I also just bought a stereo or Bridged mono TDA7293 kit on e-bay , it was like $23 and comes with all the Parts and PCB for a Stereo amp board as well as a dual gang Conductive plastic pot...
He also sells PSU boards for like $5 that come with PCB and Bridge rectifier and terminal blocks but no filter caps but spaces for 4 large caps...
Check it out...
http://cgi.ebay.ca/TDA7293-Hi-Fi-Po...14&_trkparms=72:1215|66:2|65:12|39:1|240:1318[
Cheers
PS: he also has stereo LM3886 boards for about the same price..
I just used the PCB design in the Datasheet and it worked fine , I bypassed the Anti-Turn on Thump feature so there is a small thump when you turn the amp on but it doesn"t bug me...
I also just bought a stereo or Bridged mono TDA7293 kit on e-bay , it was like $23 and comes with all the Parts and PCB for a Stereo amp board as well as a dual gang Conductive plastic pot...
He also sells PSU boards for like $5 that come with PCB and Bridge rectifier and terminal blocks but no filter caps but spaces for 4 large caps...
Check it out...
http://cgi.ebay.ca/TDA7293-Hi-Fi-Po...14&_trkparms=72:1215|66:2|65:12|39:1|240:1318[
Cheers
PS: he also has stereo LM3886 boards for about the same price..
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