6 channel power supply

[kuldeepsingh]

LM1875 costs only Rs.50 and is easily available in market. 3886 & 4780 i couldn't get any local supplier so i got a few piece as samples.

 

[ranjitraj]

Which is better option for subwoofer LM3886 or TDA7294 ?????????

 

[kuldeepsingh]

TDA7294 for Sub

 

[ranjitraj]

hi , Kuldeep sir,
Is in bridge or single tda7294 ????????????????????/

 

[AndrewT]

If you bridge any amps then each amp of the bridged pair sees a load that is effectively half the impedance of the speaker you connect.
Connect an 8ohms speaker and each amp sees 4ohms.
Connect a 4ohms speaker and each amp sees 2ohms.

 

[availlyrics]

LM1875 costs only Rs.50 and is easily available in market. 3886 & 4780 i couldn't get any local supplier so i got a few piece as samples.

I went to Lamington rd. last week , price for Chinese stuff(?) LM1875 Rs 20/- & genuine Rs 60/-. Lm3886T Rs 120/- (fake) LM3886TF Rs210/-(genuine). As for the free samples program by TI/ National, they will entertain request having corporate/ company email ids only. BTW Kuldeep do you have any geniuine LM 3886 left? You can PM me.

 

[ranjitraj]

I bought LM1875T in Rs35/- in Patna. How can i check , is it fake or genuine ?????????

 

[ranjitraj]

What is the price of TDA7294 in INDIA ???????

 

[kuldeepsingh]

1875 for 35 looks ok. is it working? just see the serial number on it and try to match it with LM1875 available online or on NS website. see if you get any similarity.
TDA7294 costs approx 120-150

 

[kuldeepsingh]

Is in bridge or single tda7294 ????????????????????/

it again depends on your woofer driver. If you plan to make an 10-12" big sub then u can go for bridge/parallel operation.

since a single tda7294 can give good amount of 80W power in 4 Ohm, even a single chip will do a good job with an 8"or 10" woofer. May be u can add another IC later if u feel less power. But i personally feel a sub of 10" with single TDA will do a good job.

and take care in woofer selection, an 8 ohm will give only 50W whereas 4 Ohm u'll get approx 80 W. so kindly consider views of Mr. Andrew.

 

[ranjitraj]

Where can i find circuit diagram for TDA7294 ????????????????

 

[kuldeepsingh]

Have you heard of google.com

 

[ranjitraj]

In TDA7294 , i am not understanding some pin like pin 4,10(mute),9(stand by) and 6 (bootstrap) in figure 1. What should i do with these pins ?http://www.st.com/internet/com/TECHNICAL_RESOURCES/TECHNICAL_LITERATURE/DATASHEET/CD00000017.pdf

 

[kuldeepsingh]

these pins are for mute and standby functions. Better search for this "DIY Kit 106. 50W Hi-Fi Audio Amplifier Module .pdf " online. or give me ur email is i'll email u

 

[ranjitraj]

tda7294

Hi , Kuldeep Sir, My email Id is ranjitraj0207 at gmail dot com

 

[ranjitraj]

Hi, Kuldeep Sir, Thanks for email, but already i have this PDF,my problem is still what to do with these pins. Should I put a switch there ?

 

[kuldeepsingh]

See page 1 last line. The mute & standby switch should be closed or should be shorted by wire link if you always want sound from the amplifier.

And if u want to incorporate mute & standby in your system, put 2 push-to-on switch there and you can get mute functionality in your amplifier.

 

[AndrewT]

Many of our Members refuse to read.

 

[ranjitraj]

Thanks Kuldeep sir,
I have just completed my amp (tda7294) , but i am little afraid to test it, because i connected pin 9 and 10 with Vs+(pin 13) and my friend suggested me to connect them (pin 9 and 10) with GND. What should i do ??????
PLZ HELP ME , I DESPERATLY WANT TO TEST IT,
PLZZZZZZZ..............

 

[kuldeepsingh]

just connect it to v+ and it should work
and plz don't call me sir