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Old 19th December 2012, 05:52 PM   #1
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Exclamation Need help with 4400 ic pinouts

Hi friends,

i am using sanyo 4400 IC's kit. the kit had no instruction manual and the vendor had no idea how to use the kit... can anyone please help me find that what the marked spacers used for in the circuit? i'd be really thankful

(strange irony pin number 11 which is vcc has been left blank in the circuit.. how am i supposed to give voltage to it? or do the ic have to be soldered facing away from the board so that pin number 11 actually becomes pin number 4 and vice versa?)

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Old 19th December 2012, 06:14 PM   #2
Mooly is offline Mooly  United Kingdom
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Unless someone knows specifically... then we are going to need a lot more info.

What is the unit ? And what is this IC kit ? Are they some kind of audio output IC ?

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Old 19th December 2012, 06:15 PM   #3
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Here is a guess work from me .
Please double check
Pin 10and 12 are for out put via 1000uFd e-caps as per datasheet.
May be you need to a a Filter cap to the circuit at c19 too if you notice any hum.
All the very best.
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Last edited by csom; 19th December 2012 at 06:22 PM.
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Old 19th December 2012, 06:40 PM   #4
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Typical mounting style of LA4440 in car stereos
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Old 19th December 2012, 06:57 PM   #5
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The 3 points which you have marked red might be for signal input as they are connected to input Electrolytic caps with a biasing of 15k to the buffer amp using transistors I guess .
Upon first power up you can check them by touching at the input with a screw driver .
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Last edited by csom; 19th December 2012 at 07:03 PM.
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Old 19th December 2012, 07:02 PM   #6
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As I can see after studying the PCB layout, it is actually pin 4 that is left blank. Pin 11 is connected to the positive rail with two jumpers --- J1 and J2.
( reference: my mod of your two photos)
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Last edited by csom; 19th December 2012 at 07:05 PM.
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Old 19th December 2012, 07:15 PM   #7
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thank you csom for sharing your valuable knowledge! why are the transistors used? a minor pre-amp?
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Old 19th December 2012, 07:20 PM   #8
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I tried to explain the mounting procedure in 3d Hope this helps
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Old 19th December 2012, 07:27 PM   #9
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Quote:
Originally Posted by csom View Post
The 3 points which you have marked red might be for signal input as they are connected to input Electrolytic caps with a biasing of 15k to the buffer amp using transistors I guess .
Upon first power up you can check them by touching at the input with a screw driver .
according to datasheet input is pin number 2 which is directly connected from the first pin in the board(5 empty connectors)
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Old 19th December 2012, 07:28 PM   #10
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Quote:
Originally Posted by godslayer View Post
thank you csom for sharing your valuable knowledge! why are the transistors used? a minor pre-amp?
You are more than most welcome

Usually this type of amp kits uses a bass and treble control. So I presume these two transistors are used here as buffer amplifiers.
And regarding the number of passive components there might be bass and treble controls too. I will look more and post my observation
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