Topic: TDA7294 amp

[rmpmla]

rmpla,

so the tda's will make good bass amps!

yes, kung ang comaprison eh OPA 549 o 541. mas madali kasing mag-distort yung sound ng OPA 541 sa loud volume then followed by OPA 549. but that's just me  .

[ATJr.]

the opa541 can take higher rails than the opa549, therefore can dish out more power.

[rmpmla]

the opa541 can take higher rails than the opa549, therefore can dish out more power.

not sure about the exact figure but based from TI's datasheet, OPA541 output current - 5A while OPA549 output current -10A

sir tony, are you still in the here o nasa russia na kayo?

[ATJr.]

not sure about the exact figure but based from TI's datasheet, OPA541 output current - 5A while OPA549 output current -10A

sir tony, are you still in the here o nasa russia na kayo?

the chip with the higher rail can put put more power in theory, but there are other things to consider, SOA limits the op541 to 5amps, but parralelling several devices will give more power into say 4 ohms, the ability of the opa549 to deliver more current stems from its lower rails.

operating the opa541 at rail levels same as the opa549 can give you the same output currents., the chipmaker just would like to make sure that the opa541 is not abused.

my trip to russia is delayed pending medical clearance issues, i may still be here for chrisstmas..

[khelo275]

ang hirap kc kpag nkabili ng sira, pag on ng power sunog agad. sunog agad ang P215    mabuti n ang cgurado...
 rmpmla,  how long  n ang serbisyo ng tda7294 amp mo,  nabugbug n ba yan? o bihira mo lng gmitin.  kc nkita ko mrami k na rin  gainclone project.  cguro hindi mo n rin nagagamit lahat
so far  ano pa ang pina project mo?    btw, may tone control b ung mga amp mo?

sir jojoD
bka nxt yir n ko ppunta jan senyo, busy p eh,  mag ppasko marami png binabalot

[ATJr.]

these small chips needs needs decent heatsinking if it is to survive usage at near full power. it is harder to fake ic's than transistors. i you want your 215 protected, do not skimp on the heatsink!

[JojoD818]

Tony's right, the bigger the heatsink the better. Download mo yun datasheet ng 7294 at may computation yun for sure ng heatsink requirements. That way protected ang investment mo sa pagkasunog.

As far as my GC projects are concerned I never use tone controls anymore - but can use one if desired of course, maybe others can share their "usual" input preamps wether active or passive.

Ok nxt yir na tayo magkita, dami ko din tatapusin ng hindi naman puro umpisa ang nagagawa ko. 

[ATJr.]

anybody for a group buy of conrad engineering heatsinks? those 150mm x 300mm and 150mm x 400mm heatsinks are yummy! maybe we can get a good price if purchased in bulk.

[khelo275]

thanks,  sir jojoD  /  sir 2ny. 
 your right, d bigger d better.   thats why im looking for a better aluminum casing.  i saw some thick aluminum pan  here in factory, cguro pede n rin yun   linis lng ng konte mukha nring bago..

is it true,  tda7294 can dissipates 100 watts of heat?  kc un ang nkalagay dun s datasheet.   so ang RMS nito mga 50 watts? 

conrad engineering heatsinks sir 2ny, mukhang heavygat yan ah?!!!

[ATJr.]

is it true,  tda7294 can dissipates 100 watts of heat?  kc un ang nkalagay dun s datasheet.

that rating is based on a case temp of 25*C, actually this is not realistic, you still have to mount that chip on a heatsink, so some derating is required, otherwise your chip will fry!

the 50watt output otoh, is based on rails of +/-35 volts with an 8 ohm load. more power can be achieved with higher rails and lower loads, but at the expense of higher heat, which is not healthy for your chip, or the protection circuit on the chip will be triggered.

[khelo275]

thanks  sir 2ny,
now i undrstand so d bigger heatsink  d better...  mas maganda sana  ung buong chasis  eh heatsink

[ATJr.]

mas maganda sana  ung buong chasis  eh heatsink

why not? this is doable!you can go to sulimco metals in aranque market and get this 1.5mm aluminum sheet , there are bending machine shops nearby that can make a chassis for you.

[rmpmla]

  mas maganda sana  ung buong chasis  eh heatsink

pwede na ba ito 

[khelo275]

wow! hanep  nmam nyang amp mo rmpmla,  alin b jan ang may TDA7294?
    picture nman nung internal, saka ung may TDA7294 ...

ang tindi nyo tlaga mga bosing!. si  sir jojoD, ang lu-lupit din ng mga project...   picture nman ng mga ampli mo sir tony ...
magkano mo nbili ang heatsink mo rmpmla?
sir tony magkano ang aluminum sheets?

[rmpmla]

khelo 275,
unfortunately both are OPA 549 amps but  TDA's can also fit inside of the chassis.

yung price yata nung heat sink para dun sa big GC amp ay P1,000.

check out the gainclone thread, naadun yung internals pati yung wooden chassis para sa TDA 7294.

goodluck 

[khelo275]

rmpmla,
wla k bng naging problema nung unang power on  mo s tda7294,  wla bng humming?

thanks, pasok nlng muna ko s gc thread

[rmpmla]

rmpmla,
wla k bng naging problema nung unang power on  mo s tda7294,  wla bng humming?

wala namang problema nung unang power up. TDA ang una kong assemble na GC at me faint humming sound nga. napansin ko ito nung about  1"~2" ang layo ng tenga ko sa speaker 

[khelo275]

Merry Christmas  and  Happy New Year  sa inyong lahat

kita kits nlng sa 2006

[Tube Pro]

yes, oriental can be trusted, i also buy from liamson, newport, hirose, eleshop.....you have to be carefull when buying form deeco....


rmpla,

so the tda's will make good bass amps!

this is almost a 4-year old quote from Sir TonyT.  
Anyways, correct ka po sir TonyT.
Share ko lang.
I have an AR Status Sub 25A (Acoustic Research powered subwoofer) and it uses a single TDA7294V with +/- 40v DC.
Ito po ung AR sub 25A:






Mura ko lang po nabili d2 sa Macau kc may sira ang amp. May -40v DC out, kaya naka trigger ung relay speaker protector.
Nakabili ako kanina nung TDA7294V sa HK, equivalent to Php 205 ang isa.
I bought 2 pcs, spare lang ung isa.
Dagdag ko lang para may idea po kayo sa current price: (GC)
LM3875TF = P 280
LM3886TF = P 300