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Chip Amps Amplifiers based on integrated circuits

lm3386 parallel
lm3386 parallel
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Old 1st September 2019, 09:53 AM   #1
rookiesparks is offline rookiesparks  Guernsey
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pcb board only hifi jeff rowland two parallel btl mold lm3886 2 parallel Jeff Rowland mono amplifier board lm3886 amplifier-in Amplifier from Consumer Electronics on Aliexpress.com | Alibaba Group


please see the link above ,(no instructions as usual) this has probably been debated many times , but could some one clarify on how to set up the bias + dc offset ect on this board? you have 2 test points v1 and v2 , i am presuming you connect the speaker outputs to a 8ohm resistor and using a multi meter on volt setting connect the (-) of multimeter to (ground or power -)???? and the (+) multimeter probe on v1 and reduce the voltage to as close to 0 volts as possible , and then the same to v2 and ultimately match the voltage between v1 and v2 to the lowest voltage ???? if you can confirm thanks
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Last edited by rookiesparks; 1st September 2019 at 10:45 AM.
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Old 1st September 2019, 10:26 AM   #2
JonSnell Electronic is offline JonSnell Electronic  United Kingdom
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There is no 'bias' setting to be done, R7 & R8 help to avoid a DC offset. The two pots only decrease the resistance from the +ve non inverting input to ground and according to the manufacturer, Texas Instruments, they have no appreciable affect. If the potentiometers wiper was connected to the +ve input and one end went to a positive potential and the other end to a negative potential, it would allow DC trimming of the outputs on pin 3.
Not a good idea in my opinion.
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Old 7th September 2019, 02:51 PM   #3
Fast Eddie D is offline Fast Eddie D  United States
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Originally Posted by JonSnell Electronic View Post
Not a good idea in my opinion.
Most of the parallel chip amp circuits I've seen are not a good idea.

TI has a tutorial on paralleling and bridging the 3886. It addresses the actual, real world issues and is a good starting point.
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Old 7th September 2019, 02:54 PM   #4
Fast Eddie D is offline Fast Eddie D  United States
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And here it is.

http://www.ti.com/lit/an/snaa021b/snaa021b.pdf

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