| rulezzz |
| if i take tda7293 ,tda1514 bridge and lm3886 what chip would sound better at 80w?And what chip's circuit is easiest to make for 4ohm driver? |
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| rulezzz |
| i heard that lm3886 don't like's 4 ohm and about tda7293 i don't know where to connect mute and standby connection.:mad::smash: :smash: |
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| miguel2 |
TI's OPAs have quite some current drive. Maybe the OPA541 (a bit edgy) or the 549 (more laid back).
BTW, which is the maximum current of the LM3886?
Miguel |
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| soundNERD |
The LM3886 is a pretty good sounding chip.
It has no problems driving a 4-ohm speaker. In fact, although it isn't designed for it, I have been able to run a 2-ohm speaker from it. It heated up more, though.
Never tried the other chips. Who makes them? |
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| Hybrid fourdoor |
| These guys will probably put out 80W no problem..... |
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| macboy |
| quote: | | BTW, which is the maximum current of the LM3886? |
The 3886 is spec'd for a maximum current output of 11 A. This is stated in the datasheet under Application Information. Note also the Safe Operating Area curve. which shows the maximum cureent for various collector-emitter voltages (basically the difference between the power supply voltage and the output voltage at any given instant). |
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| macboy |
| quote: | | heard that lm3886 don't like's 4 ohm |
To the contrary, the 3886 is practically designed for 4 ohms. It is rated to put out more power into 4 ohms than into 8 ohms. The 3875/3876 on the other hand, have a much lower current limit (4 A vs. 11 A for the 3886) and a lower maximum power (heat) dissipation (100 W vs. 135 W for the 3886). The 3886 is a much more robust device than the 3875, and for high-power 4 ohm applications is a better choice. |
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| rulezzz |
this is tda7294 circuit
but is it possible to use it with tda7293? |
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| rulezzz |
| i looked to lm3886's pdf and found that it can output around 90w at +/- 35 with 4ohm .If somebody used configuration like this please write how it worked(sound,heat output). |
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| markp |
| quote: | Originally posted by Hybrid fourdoor
These guys will probably put out 80W no problem..... |
At $100+ each they better!!! Why not parallel a few plastic units at $12 each? |
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| abid_rehan |
TDA 1514 is by PHILIPS, it is an astounding soundind chips with very low THD, drawback it ll blow up so easily and for reasons unknown perhaps even to PHILIPS that after a few blowouts you will be cursing the idea of making am amp by this chip at current excahge rate it is worth about 4.5$ a chip.
TDA729x series manufactured by ST microelectronics although chips and output power is good, THD is alright but drawback this chip too Blows up but better tolerability than 1514. at current exchange Rates we could get 729x chip at around 2.8$ a piece not bad.
LM3886 by National Semiconductors too is a good chip sounds good THD slightly high but doesn't blowup as easy as 1514 or 739x series but then again it sounds better than both.
Its your choice how much you could compromise? |
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| rulezzz |
| is lm3886 less powerful that tda7293? |
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| rulezzz |
finaly i built tda7294 amp but now i need to know is this circuit is good
one week ago i built tda1514 bridge ,but i asked is my tda1514 bridge circuit is good everyone wrote that it was fine ,but after when i built amp i realized that it wasn't working then somebody wrote that in that circuit pins were mixed and tda1514's fried :smash: :smash: :mad:
now i want to build bridged tda7294 please look at this circuit carefully.I'm new in electronics ,but i think that everything is fine here ,but it would be very nice to know that professionals think so too:D |
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| abid_rehan |
| LM3886 is rated at 68 Watts, whereas 729x is rated at 100 watts, be very very careful with the bridge chips will blow up short to ground, short to supply etc and u ll be mourning like frying up of 1514, but it sounds good. |
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| abid_rehan |
LM3886 is rated at 68 Watts, whereas 729x is rated at 100 watts, be very very careful with the bridge chips will blow up short to ground, short to supply etc and u ll be mourning like frying up of 1514, but it sounds good.
Try Attached one. |
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| rulezzz |
| ok, if i make this tda7294 bridge circuit would i need more things like higher power preamp or something else.And about the circuit is it realy good???????Pins realy aren't mixed????????????????????? |
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| abid_rehan |
| I dont think so that u need a higher power pre, i m working on the PCB of the same circuit but one channel and intend to use it for powered subwoofer. |
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| rulezzz |
| in this bridge/parallel configuration is MODULE1 is realy needed or it can be built without it? |
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| peranders |
| If you have a good signal source with low output impedance I think it should work. |
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| peranders |
| quote: | Originally posted by abidr
LM3886 is rated at 68 Watts, whereas 729x is rated at 100 watts, be very very careful with the bridge chips will blow up short to ground, short to supply etc and u ll be mourning like frying up of 1514, but it sounds good.
Try Attached one. |
abidr , could you email me a bigger picture, please?
You will find the email address at my homepage.
Thanks. |
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| abid_rehan |
| I ve mailed u the PDF file hope u find time to make a PCB of the same, coz I am very very very very very busy these days and can't make the PCB, If u however do make the PCB plz don't forget to mail it to me. |
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