diyAudio

diyAudio (http://www.diyaudio.com/forums/)
-   Chip Amps (http://www.diyaudio.com/forums/chip-amps/)
-   -   Need help with 4400 ic pinouts (http://www.diyaudio.com/forums/chip-amps/226050-need-help-4400-ic-pinouts.html)

godslayer 19th December 2012 06:52 PM

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?)

http://img198.imageshack.us/img198/4...1219213614.jpg
http://img685.imageshack.us/img685/9...1219213625.jpg

Mooly 19th December 2012 07:14 PM

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 ?

:)

csom 19th December 2012 07:15 PM

1 Attachment(s)
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. :)

csom 19th December 2012 07:40 PM

1 Attachment(s)
Typical mounting style of LA4440 in car stereos :)

csom 19th December 2012 07:57 PM

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 .

csom 19th December 2012 08:02 PM

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)

godslayer 19th December 2012 08:15 PM

thank you csom for sharing your valuable knowledge! why are the transistors used? a minor pre-amp?

csom 19th December 2012 08:20 PM

1 Attachment(s)
I tried to explain the mounting procedure in 3d :) Hope this helps :)

godslayer 19th December 2012 08:27 PM

Quote:

Originally Posted by csom (Post 3291715)
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)

csom 19th December 2012 08:28 PM

Quote:

Originally Posted by godslayer (Post 3291744)
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 :)


All times are GMT. The time now is 10:44 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio


Content Relevant URLs by vBSEO 3.3.2