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Old 13th November 2004, 11:10 AM   #1
kinser is offline kinser  Israel
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Default lm3886 as driver + mjw21195/6

Hi guys,
i made this amp using the lm3886 chipamp and a pair of mjw21195/6 transistors... could someone chek the circuit and give me the go to test it? could someone simulate it?
it would help me alot.. i will post the schematic and some pics of the amp...
thaks
Kinser
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Old 13th November 2004, 11:51 AM   #2
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anyone?
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Old 13th November 2004, 12:00 PM   #3
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Default People here, seems to turn themselves shocked with chips.

This is some "second class" audio amplifiers for some purists...some hi level exigence audiophiles.

I think the have some reason, despite that the idea is very interesting.

If you want people to came fast....let some error....this way, many will be motivated to enter, as they will help you. If everything well made...they will see and think...hummmm, and go away.

regards,

Carlos
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Old 13th November 2004, 12:07 PM   #4
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carlos,
i didnt really understand what you wrote.... im only 14 years old.....
so i dont mean to be a bug but could you expane it in simple english?
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Old 13th November 2004, 12:11 PM   #5
Rudy is offline Rudy  Belgium
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the only question i have is "why"

becouse at 28v supply voltage, you really shouldn't have any problems off driving any load, at 35V, yes you can have problems.

Rudy
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Old 13th November 2004, 12:15 PM   #6
kinser is offline kinser  Israel
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rudy,
i am runnung it on 35 volt dc supply... and when i power it up the fuses on the power supply blew....
btw its for a 8 ohm speaker thats why i am running it at 35vdc.
so is the circuit ok?
thanks
Kinser
p.s.
sorry that i am so anoying.
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Old 13th November 2004, 12:26 PM   #7
Rudy is offline Rudy  Belgium
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the reason for the fuse is simple, the amp ( lm3886 ) has a quiesent current of 50mA, this is the current thrue the 220ohm resistors, the voltage over this resistors should be ~0.6V, but it is infakt 11V, so the whole circuit acts like a short circuit.

If you or only going to use a 8ohm load, just leave the transistors out, if you look at the datasheet of the chipamp you wil see the amp can perfektly handle 8ohm loads.

there is no need to make this hobby more difficult as it is

Rudy
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Old 13th November 2004, 12:32 PM   #8
kinser is offline kinser  Israel
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rudy,
the resone i added the transistors is because i only had 1 chip left and 50 transistors, second resone is i was thinking of getting +-100 watts. its for a subwoofer amp... is there any way to chang something so that the amp will work like i expected? 68watts(more like 50) is not enough for me at the moment....
Thanks,
Kinser
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Old 13th November 2004, 12:44 PM   #9
Rudy is offline Rudy  Belgium
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1. try using 12ohm resistors instead of the 220ohm
2. the 0.1ohm resistors should be located between the supply and the emitter off the transistors( not on the collector ), and you better use some higher values, like 0.22 or 0.47ohm

after this you should check the quiesing current off the whole amp, if it is still to mutch then lower the resistor of 12ohm.

but 1 thing i just have to mension, you cannot go with a higher supply voltage then 42V, or you will destroy the chipamp.

Rudy
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Old 13th November 2004, 12:56 PM   #10
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Rudy,
thanks for your help...
i will try what you told me to do!
and will post results on tusday of wensday
Thanks,
kinser
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