TDA3875 and TDA3886 and TDA 4780 Single Supply Biasing

abid_rehan · 22nd February 2004, 05:13 PM

Well I want to make a Subwoofer using mentioned chips, I have already made the main amplifier using TDA7386 which happens to be a superrrrrr chip 4 channel 45 watts each, now for subwoofer I have the choice of above mentioned chips but does anyone have the idea how to operate them with 13.2 Volts of Car bettery, as the data sheet of these chips do give a hint of single supply biasing but required voltages to bring the chips into ACTION are not,
CAN ANY ONE PROVIDE HELP???

SpaBlauw · 22nd February 2004, 06:01 PM

LM3875 LM3886 ?

Take 2 batteries and bind 2 different poles together, this is your GND. Now you have - 12 / + 12 v if you measure from ground to the other posts.

abid_rehan · 23rd February 2004, 01:54 AM

Guess I messed up things please read as LM3875, LM3886, and LM47xx, joining two batteries is a good idea, I knew it already as u all know its kinda difficult to place an extra battery in the car even if u put it how would it be charged, so any other solutions...............
Any one with some other solution?

abid_rehan · 28th February 2004, 05:21 PM

Are there any bright minds out here in this formu who could solve this problem of biasing an LM3875 or LM3886 with 13.2 volts of car bettery?

22nd February 2004, 05:13 PM	#1
abid_rehan diyAudio Member Join Date: Mar 2007	TDA3875 and TDA3886 and TDA 4780 Single Supply Biasing Well I want to make a Subwoofer using mentioned chips, I have already made the main amplifier using TDA7386 which happens to be a superrrrrr chip 4 channel 45 watts each, now for subwoofer I have the choice of above mentioned chips but does anyone have the idea how to operate them with 13.2 Volts of Car bettery, as the data sheet of these chips do give a hint of single supply biasing but required voltages to bring the chips into ACTION are not, CAN ANY ONE PROVIDE HELP???

23rd February 2004, 01:54 AM	#3
abid_rehan diyAudio Member Join Date: Mar 2007	I Messed up things Guess I messed up things please read as LM3875, LM3886, and LM47xx, joining two batteries is a good idea, I knew it already as u all know its kinda difficult to place an extra battery in the car even if u put it how would it be charged, so any other solutions............... Any one with some other solution?

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22nd February 2004, 06:01 PM	#2
SpaBlauw diyAudio Member Join Date: Apr 2003 Location: Genk / Belgium	LM3875 LM3886 ? Take 2 batteries and bind 2 different poles together, this is your GND. Now you have - 12 / + 12 v if you measure from ground to the other posts.

28th February 2004, 05:21 PM	#4
abid_rehan diyAudio Member Join Date: Mar 2007	Are there any bright minds out here in this formu who could solve this problem of biasing an LM3875 or LM3886 with 13.2 volts of car bettery?

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