[A1200] Let's change those capacitors!

[8bitbubsy]

Having sound problems or other weird "coming and goes" issues with your A1200?
So do I, so let's exchange those old capacitors to see if it solves the issues. It's healthy for her!

I don't advice you to do it if you have no experience soldering on SMD components! Be extremely careful when lifting the SMDs off from their pads - I take no responsibilities.
"Also remember to observe polarity when taking old caps off. The new ones have to go back the same way." - Eclipse



Most of the parts can be found at http://www.futurlec.com/

[rkauer]

3. 10uF x 35V (no need for, any above 16V will do)
4. 100uF x 65V (same remarks as above)
5. 22uF x 25V *
6. 47uF x 16V

*notice that the pair very near the audio connector need to be no-polarized units instead the original (AND WRONG) polarized pair Commodore used in that place.

[8bitbubsy]

Originally Posted by rkauer

*notice that the pair very near the audio connector need to be no-polarized units instead the original (AND WRONG) polarized pair Commodore used in that place.

Does it make any difference?

[Shadowfire]

Yes.

[8bitbubsy]

Originally Posted by Shadowfire

Yes.

What difference does it make? I'm curious.

[illy5603]

This thread looks useful but now I can't tell where everything goes.

@RKAUER,

Using your advice form a similar thread I bought a strip of the 22uF 25V caps from digi-key to replace my audio caps. What about the other caps listed here, where do they go?

Thanks!

[8bitbubsy]

Originally Posted by rkauer

3. 10uF x 35V (no need for, any above 16V will do)
4. 100uF x 65V (same remarks as above)
5. 22uF x 25V *
6. 47uF x 16V

*notice that the pair very near the audio connector need to be no-polarized units instead the original (AND WRONG) polarized pair Commodore used in that place.

Time to buy these !!

15-pack 10µF 16v SMD:
http://cgi.ebay.com/SMD-Electrolytic...d=p4999.c0.m14
$1.50

10-pack 100µF 16v SMD:
http://cgi.ebay.com/SMD-Electrolytic...d=p4999.c0.m14
$1.50

10-pack 22µF 25v SMD:
http://cgi.ebay.com/SMD-Electrolytic...d=p4999.c0.m14
$1.50
(What about the no-polarize thingie here? )

10-pack 47µF 16v SMD:
http://cgi.ebay.com/SMD-Electrolytic...d=p4999.c0.m14
$1.50

Are these okay?
All from the same seller, and super cheap!

[prowler]

Thanks for restoring your opening post, 8bitbubsy!

[rkauer]

Originally Posted by 8bitbubsy

What difference does it make? I'm curious.

The audio out circuit is an alternate voltage circuit, requiring no-polarized capacitors (it uses + & -12V). Commodore did use ordinary polarized units to cut costs since the current who flows through the capacitors is very low and so the ordinary capacitors will last some time.

Of course, they are the first ones who "suffers the penalty" when the capacitors starts to decay.

[NovaCoder]

Good old Commodore, cutting costs to the last

[illy5603]

So will these work for the 2 audio capacitors? I have 25 of em' here so I am hoping they are correct.

[Cosmos]

Please, post the bill of materials (capacitors) for all other Amiga Classics


Thanks,

[Eclipse]

Hi,
So actually it's:
3 x 22uf 25v electrolytic
2 x 22uf 25v non-electrolytic

I would actually list those 2 caps on their own, some people may get confused.

Also remember to observe polarity when taking old caps off. The new ones have to go back the same way.

[rkauer]

Originally Posted by Eclipse

Hi,
So actually it's:
2 x 22uf 25v non-electrolytic

Almost right (but still wrong): 2 x 22uF 25V electrolytic non-polarized.

[rkauer]

Originally Posted by illy5603

So will these work for the 2 audio capacitors? I have 25 of em' here so I am hoping they are correct.

Those are the same polarized units used on the circuit. And with the same short lifespan (1000 hours).

Look for something better. They are some mini-capacitors with same capacitance and even smaller body with a way longer lifespan out there.

[illy5603]

Originally Posted by rkauer

Those are the same polarized units used on the circuit. And with the same short lifespan (1000 hours).

Look for something better. They are some mini-capacitors with same capacitance and even smaller body with a way longer lifespan out there.

Thanks... I ordered those capacitors from recommendations in another thread, bummer that they are not 100% correct. Not being familiar with these components, I have no idea how to tell a polarized capacitor from a non polarized one. I don't see any mention of polarization in the description of the part I purchased. Maybe it is there but I am not familiar with all of the notation and terminology.

I think what a lot of us are hoping for is "Capacitors to replace on your Amiga for Dummies" even if it is just for the parts needed. I am having a professional do the install.


:-)

[rkauer]

The black mark over the top is the negative side. Also on the bottom side you'll notice the rubber pad is not square: the narrow side is the positive lead.

Of course, in no-polarized units there is no such indications, since there are no positive nor negative side.

[8bitbubsy]

Originally Posted by rkauer

Those are the same polarized units used on the circuit. And with the same short lifespan (1000 hours).

Look for something better. They are some mini-capacitors with same capacitance and even smaller body with a way longer lifespan out there.

Hey..
Do you happen to know where I can buy these 'better ones'..?
Ebay would be fine, or something.. Shipping and "pickup job" is usually super expensive on eletronics stores online

[rkauer]

Futurlec is a very good option for UK and european citizens.

Look for SMD capacitors first then on non-polarized units. Top service with fast delivery and good prices.

[EDIT] SMD no-polarized units page: http://www.futurlec.com/CapElectroNonPolar.shtml

[8bitbubsy]

Thanks for that site, cheap shipping!

EDIT: I can only find 16v, 35v and 50v for the 25v 22µF polarized ones. What to choose?
And the non-polarized ones are 100v