Playstation as CD-player

[phn]

I'm not quite sure. And after frying the SMPS I don't really look forward to play around with it at all.

In the schematic I posted here some time ago, there are just 3 leads following the transformer. I thought that was great. For me, 3 leads are a lot better than 7. Then it turned out you need 5. Not as interesting anymore.

Well, I like the idea of keeping the transformer and especially the voltage regulator away from the PSX. But I also like to keep the power button as well as keeping the PSU close to the board.

If this is a good idea, I don't know. I'm not the engineer here. So Greg, you know better than me about any inductance. But I just ordered an SMPS and will report here once I have tried it. Again, after my mishap, I'm not that overly confident.

I have more reasons for this. Those are farfetched. So until I know I won't tell. If it does work, I'll let you in on it. Otherwise there's nothing to know.

[weng]

hi,

can someone teach me here how to convert a 110v PS1 to 220v? in my place the shops are charging US$20 (equiv) for the conversion. maybe it is cheaper to diy if it ain't difficult. what are the parts needed to be replaced?

cheers

[phn]

Get a new PSU. Try eBay.de.

Or get a SCPH-1002. Since you only need the PSU, the condition of the console doesn't matter.

[Mick_F]

In that case, it is better to get a SCPH500X or 550x. These are cheaper and you can be sure that you get one of the more modern types of SMPS. Keep in mind that the first batches of SCPH100x were sold with SMPSs having very high heat dissipation and rectification by an IC.

Mick

[weng]

thanks for the replies guys.

i have heard from the shop (rumors from the by-standers)
that they had changed the cap and a transistor only

i may borrow one of my friends converted PS1 and take a peek on the inside. then i can compare what is new vs my 110v unit.

[Greg Stewart]

Originally posted by phn
<SNIP>

If this is a good idea, I don't know. I'm not the engineer here. So Greg, you know better than me about any inductance. But I just ordered an SMPS and will report here once I have tried it. Again, after my mishap, I'm not that overly confident.

<SNIP>

Actually I didn't, it was a good educated guess, but I spent a little time learning a bit more about SMPS's today. Figure 4 on this site looks to describe a SMPS scheme that 's very close to the SCPH-7500 PSU schematic posted a few pages back:

http://www.steve-w.dircon.co.uk/flea...il/history.htm

Based on how that functions, you're extending the path for the regulator's feedback loop... it might cause problems, honestly I am not sure here, but DO have a good fuse in the unit and if it blows, trust that it is telling you something you don't want to ignore.

Let us know the outcomes!

Greg in Minneapolis

[DragonMaster]

and rectification by an IC.

My 1001 has the old-type gray transformer, but diodes for rectification...

[phn]

Greg, nice link. Yeah, I like figure 4. Now the only thing that remains is to find out what the inductance will do to the circuit.

I can't say I like this: "The linear is also preferred where a virtually noiseless supply is required." Does that mean a traditional PSU could be an alternative? You don't have to answer that. It's just that I was really banking on the SMPS. To me it seems like the choice between SMSP and linear PSU isn't that clear cut as I hoped. This isn't necessarily a bad thing. Transformers may be costly, but at least they are simple to work with.

[DragonMaster]

I can't say I like this: "The linear is also preferred where a virtually noiseless supply is required." Does that mean a traditional PSU could be an alternative? You don't have to answer that. It's just that I was really banking on the SMPS. To me it seems like the choice between SMSP and linear PSU isn't that clear cut as I hoped. This isn't necessarily a bad thing. Transformers may be costly, but at least they are simple to work with.

Which is why I suggested a linear supply from the start and not to bother with the SMPS.

Not the only thing, SMPSes make more than line noise, they also make RFI. Turn on your PlayStation near an AM tuner on ~890kHz...

They also act strange when you play with them.

A transformer for the PlayStation would not need a lot of power / would be cheap. The 1001's SMPS uses 17w. (And I'm sure a lot of them are waisted in heat)
A small 20-30VA toroid is cheap.

[Greg Stewart]

Originally posted by Mick_F
<SNIP>
... the first batches of SCPH100x were sold with SMPSs having very high heat dissipation and rectification by an IC.
<SNIP>

Originally posted by DragonMaster

My 1001 has the old-type gray transformer, but diodes for rectification...

I keep forgetting to mention... that IC is just 4 diodes in a bridge configuration, exactly the same as the four individual diodes in the other PSU's.

The high heat dissipation is another thing, but having the diodes in a monolithic bridge (as opposed to 4 individual diodes in a bridge) is not a bad thing for those early PSU's.

Greg in Minneapolis