| sparkle |
Hi guys...
My girlfriend had an Panasonic SA-AK20 stereo system with cd changer... This unit died yestarday after 9 years of working. Cd changer went dead. So I have a problem - to make an amplifier out of it. Problem is not making an amplifier but that I don't know what is the chip inside it.
On chip it says:
BC
POWER MODULE
RSN 3502 A
020601
Does anyone knows where to find datasheet for that chip or some schematics. I have to use the same transformer from the stereo system and some of the parts but I don't like to take the schematic from the pcb board... Maybe it could be easier...
Thanks in advance
daniel |
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| sparkle |
| :bawling: :bawling: :bawling: :bawling: :bawling: :bawling: :bawling: :bawling: :bawling: :xeye: :confused: |
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| Netlist |
This is all I have. It's the B version, can't find the difference with the A-version.
Hope this helps.
Greetings
/Hugo |
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| sparkle |
Hi guys!
Ropie,
I can't build Gainclone because my tranfo from stereo system is not good (29,7V-0V-29,7V and 13,0V-0V-13,0V all in all aproximatelly 100VA-120Va transfo). The voltages and VA are not good for gainclone :)- only if You ment with this chip- the chip is aprox 80$ brand new and I would not like to buy some chips instead I would like to rather use this chip because I simply have it and for LM1875 and LM3875 (as I have said) the voltage is not good:) - but it would be in gainclone style if I could find some datasheets
Netlist,
thanks man- I will see what to do with it- I must turn on my brain cells and see what will come out (hopefully not something +'%&/$"3215%) ;)
It is perfect for a start- thanks again.
I hope I'm free to ask You something if I would have any questions?:cannotbe: ;)
best regards
daniel |
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| sparkle |
| found picture on net.....:xeye: |
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| JOE DIRT® |
| That looks similar to the STK 4042 modules I have...I bet that the circuit would be similar |
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| Netlist |
Daniel
SVI3102D and RSN3502 are about the same or at least interchangeable. The datasheet of the STK4042 has a totally different pinout.
IMHO it shouldn't be too difficult to derive something from the next picture. (SVI3102D)
/Hugo :) |
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| sparkle |
Yes , on the other thread in forum (part with components) I asked also this question an mention that this chip is practically the same as one Zou have mentioned- but I forgot to post it here- so somebody might have shematic that You posted- THAKNS A LOT - my girlfriend will be very happy (hopefully- I will post something in here when it is finished:) ):bigeyes: :D ;) :rolleyes: :cool: :) :clown: :) :smash:
thanks |
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| Netlist |
| quote: | Originally posted by sparkle
my girlfriend will be very happy (hopefully- I will post something in here when it |
Yes, make some nice amp with it!! ;)
/Hugo - would do anything to make girlfriends happy :cool: |
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| sparkle |
| :D :D :D :D :D :D |
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| sparkle |
| :bigeyes: :bigeyes: :bigeyes: :xeye: :eek: |
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| sparkle |
O.K.
Hi!
I didnt do it.....:) He said....
Well if I get this right the schematic might look like down below for it. Please correct me if I am wrong (especially the red marks).... Thanks...
Also say what could be done like in Gainclone style if it would be possible because this amp looks like it could...
Also I have found some differences on the original board of the sound system so that would be the second schematic.
I have a question.... My friend heard about my amplifier problems ( I was asking him if he knows where to find datasheets etc.) and he gave me for a couple of cap's a pcb from an old Revox amplifier with an toroid transfo. The pcb contains 2 chips TDA1514A. What should I do. Which amplifier is better?
TDA1514A is mono 50W amplifier but it is very cheap (6$ or so) and RSN is not so cheap (70$ or so). Which one would sound better that is the question :) now.
Ofcourse there are some sentimental reasons to use RSN chip because my girlfriend says:" What have You done to my stereo :) she didn't saw what I did to mine.... :) :) |
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| sparkle |
| and the another one- from the old stereo:rolleyes: |
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| Netlist |
| quote: | Originally posted by sparkle
It just fell off |
10 X LOL
What a nice picture
I never saw a big chip open like this. Quite impressive.
You might take care, something tells me strange chemicals could be exposed now. :eek:
I could try and dig a bit deeper to find more info on that chip but looking at the present state I got the feeling it became quite useless.
Here's one advice: Find the beautiful Gainclone threads, print the nicest pictures (on high glossy paper of course), sit down, relax and show them to your girlfriend, let her choose a model and promise her to build one. ;)
Warning: You could have a hard time with Peter’s art.
I know very little about Gainclones, but who says those trafo's are no good? LM3875: Supply: 20-84V. Looks like any trafo could be used.
/Hugo :) |
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| sparkle |
What about TDA1514A chip. I have 2 of them in an old revox and I could dig them out.....
Yes yes- the LM3875 or LM1875 was my second choice- well maybe the LM1875 was my second choice...:)
The RSNxxxxx chip was working until the stereo went dead (I meen CD changer went dead).... I think I would give it a try and connect it in the air and see what happens.... I will let You know....
IF You wish I could send You some more pictures I have in greater resolution from that chip........:)
p.s. picture is from revox board
edit: I found some informations about TDA1514A - don't bother :)) |
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| sparkle |
by the way - I have started (after some thinking) to work on a RSN module....
BC mannufacturer was buyed buy Vishay and new owner turned down all the semiconductor production so thats why there are no datasheets- among all other reasons :)
have fun
daniel |
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| Alex S |
sparkle,
very nice pics you've posted! Much appreciated. |
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| sparkle |
More to come when I'm finished- unfortunately my time is very short for DIY audio these days:bawling: :bawling: ........
regards
daniel |
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| sparkle |
Hello again!
Well - finally I have finished it few days ago. Triple checked everything- everything was o.k. but when I power it up, nothing happened. The chip was dead- probably when the cover fell of something happened.
My girlfriend was very sad and I was not very happy because of the time put in..... Well back to the old drawing board. I have two TDA1514 chips so it is half way done now- hope this will work. TDA is easier to find if anything goes wrong- so, again, we'll be in touch.
:bawling: |
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| sparkle |
I didn't finish what I have started here.....
Te amp for my girlfriend was finished a week from the last post on this thread... it was made with TDA1514 like I said I will do....I will post some pictures.....
I managed to disconnect the part of the board of that old amplifier that was only amplifier itself so the logis went into my junk-yard...I used the amplifier part of the board and it worked instantly and very good. Unfortunately the voltage was little bit low but it works now also.... nothing happened till now.... everything fine....
sorry for the delay .... hope that You all that read this will foget me
daniel |
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| sparkle |
another (the old board that i cut in half to remove the amplifier part)
my girlfriend says that she is very happy with the amp :)
ps.s my friend Carlos .... i will tell You everything .....mp3...don't worry |
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| Netlist |
Now, that's one of a kind. :nod:
Congratulations.
/Hugo :) |
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| sparkle |
thank you - i am sorry that it is a little bit late... i had probably another worries so i simply forgot to post feedback... i hope that everybody will forgive me :cannotbe:
daniel |
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| destroyer X |
Not exactly the same...but a near cousin.
Mine is RSN3502N ..... well this "N" create a power supply voltage difference, this one can hold 40 volts simetrical and goes very easy to 60 watts undistorted each channel, when both are simultaneously driven.
Heat is big... bias current is high, and heatsink need to be very big...something alike 20 heatsink fins having 10 square centimeters each fin.
The internal protection is more kind than many others chips...as do not limit current...so...you have some twice this power instantaneous peak power, and this produces a very nice effect!
Quality is very nice, having worst midranges than LM3875 and better trebles and better dinamics.
Deep bass reproduction is almost the same of LM3875 not modified to increase of bass in extreme low frequencies.
We have to search for 15 volts somewhere or produce this negative 15 volts to feed pin 8.
The Chip uses a very strange AC information in the pin 6...maybe sensing voltage variations....it capture the signal from one of the power transformer secondary AC output (around 22 to 29 AC Volts)..... find a voltage divider that reduce the amplitude to 15 percent and feed the low impedance input in the pin 6.
Very interesting is that the chip is big...so, as a result, the input and output are not near.... this avoid a lot of compensations that normally result not good...also the enormous aluminium panel it has in its back (never flat, have to sand over a glass!) have area enougth to transfer a little bit more than 300 watts of heat...this way, produce 75 watts continuous each channel will not destroy the unit...voltage can be increased, input condenser increased and feedback line condenser can be increased too, resulting in 10 hertz reproduction without any loss of power.
Good luck to you....if want better sound...change to Mika.......as Mika sounds great!
ahahahaha!
Carlos |
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| sparkle |
Nice... I am happy that it is working with someone.... this chip gave me a headache..... the chip is nice.. it looks nice ... but I have a better solution now with my girlfriends home.... YEEES, Mika is nice... and it sound very nice to.... when it is burned in... must you must burn it good otherwise it doesn't work good.... :)
regards
I am happy for you
daniel |
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