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Chip Amps Amplifiers based on integrated circuits

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Old 23rd February 2011, 03:04 AM   #1
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Smile I just need a approval.

OK this is base on this Amplifier...

Low Voltage Audio Amplifier Module, Based on NJM386 - eBay (item 130490036997 end time Feb-23-11 10:08:35 PST)

If you're looking the amp with the potentiometer pointing to the left, ON CN1 that's would go the battery wires, the left dot would go the negative and the right dot would go with the positive. Rite

And on CN2 the audio Input left dot positive and right dot negative.

And the last one CN3 to the speakers with the negative on top and positive on the bottom.

is this all correct. Thank you so much in advance.
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Last edited by hobbyguy; 23rd February 2011 at 03:07 AM. Reason: Adding a picture.
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Old 23rd February 2011, 03:32 AM   #2
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Hm..hhmm!
Why do you need such ridicolous power ?
Is it for motorcycle ,like installing mics and speakers inside the helmets ?
I mean ...I used to play with those thingies .
If you start to call the 0 V 'Ground' and not 'negative' ,then you could be introduced
in higher power chips (such as the famous LM 3886 ) which utilizes dual power supply,which has a positive and negative potential ,both referred to ground = 0 V
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Old 23rd February 2011, 05:48 AM   #3
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Originally Posted by picowallspeaker View Post
Hm..hmm!
Why do you need such ridiculous power ?
Is it for motorcycle ,like installing mics and speakers inside the helmets ?
I mean ...I used to play with those thingies .
If you start to call the 0 V 'Ground' and not 'negative' ,then you could be introduced
in higher power chips (such as the famous LM 3886 ) which utilizes dual power supply,which has a positive and negative potential ,both referred to ground = 0 V
Well I'm just new to all this so i tough this was good to start but i guess not, but was everything correct about the connection.
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Old 23rd February 2011, 05:53 AM   #4
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Yes.Those are the same connections you would find in any amp ,from 0.1 to 100000 W
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Old 23rd February 2011, 05:57 AM   #5
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Originally Posted by picowallspeaker View Post
Yes.Those are the same connections you would find in any amp ,from 0.1 to 100000 W
OK thank you so much, just didn't want to blow up the thingie, well after this one ill move up to the amp with the chip that you mentioned earlier. Thank you if i need any help can i send you a PM.
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Old 23rd February 2011, 09:34 AM   #6
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Oh hey this question is for any body that comes in this page is there any danger putting this amp to a big speaker and turning the whole volume all up. Thank you.
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Old 23rd February 2011, 10:10 AM   #7
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Here I go again !! If I remember well ,that chip should provide less than 1W ,and with high distortion rates . As I said ,it's good for other purposes ( it's one of the oldest audio ICs ),such battery powered radios ,hand held equipment etc. Hi-fi or at least medium-fi or even low-fi requires that a musical event or speech could be well perfectly understood as it was played originally , and even if 1W is an average level of listening ,but for reaching that level you'll have to cope with all the power losses in the system : efficiency for class AB amplifiers is about 70 % ,class B a little more ,class A being the more inefficient . Also speakers are rather inefficient ...1-3 %.......
Guess ...
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Old 23rd February 2011, 11:01 AM   #8
AndrewT is offline AndrewT  Scotland
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Originally Posted by picowallspeaker View Post
speakers are rather inefficient ...1-3 %.....
0.1% to 50%
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regards Andrew T.
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Old 23rd February 2011, 11:26 AM   #9
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VCC, the left side of CN1 is the positive side of the battery, GND the right side of CN1 is the negative side of the battery.

Hope this helps
-Tony
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Old 25th February 2011, 01:15 AM   #10
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Quote:
Originally Posted by picowallspeaker View Post
Here I go again !! If I remember well ,that chip should provide less than 1W ,and with high distortion rates . As I said ,it's good for other purposes ( it's one of the oldest audio ICs ),such battery powered radios ,hand held equipment etc. Hi-fi or at least medium-fi or even low-fi requires that a musical event or speech could be well perfectly understood as it was played originally , and even if 1W is an average level of listening ,but for reaching that level you'll have to cope with all the power losses in the system : efficiency for class AB amplifiers is about 70 % ,class B a little more ,class A being the more inefficient . Also speakers are rather inefficient ...1-3 %.......
Guess ...
Ok, thank you for giving me more info on this amplifier you think it would sound louder uF I use a 9V battery, I'm using three triple A. Thank you again.
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