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Old 12th September 2012, 05:29 PM   #21
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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.
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Old 13th September 2012, 02:00 PM   #22
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Which is better option for subwoofer LM3886 or TDA7294 ?????????
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Old 13th September 2012, 02:02 PM   #23
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TDA7294 for Sub
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Old 13th September 2012, 03:01 PM   #24
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hi , Kuldeep sir,
Is in bridge or single tda7294 ????????????????????/
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Old 13th September 2012, 03:07 PM   #25
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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.
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Old 13th September 2012, 06:34 PM   #26
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Quote:
Originally Posted by kuldeepsingh View Post
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.
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Old 14th September 2012, 06:21 AM   #27
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I bought LM1875T in Rs35/- in Patna. How can i check , is it fake or genuine ?????????
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Old 14th September 2012, 06:22 AM   #28
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What is the price of TDA7294 in INDIA ???????
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Old 14th September 2012, 07:40 AM   #29
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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
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Old 14th September 2012, 07:47 AM   #30
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Quote:
Originally Posted by ranjitraj View Post
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.
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