PC Engine (original) power adapter voltage output

Can anybody tell me the exact voltage that the official PC Engine power supply outputs (not what it says it does, but the actual voltage)?

 

If you are measuring it and confused, its because its unregulated.

Measuring it with no load is completely pointless and wont give you the correct value.

Edit:

Explanation: https://www.sparkfun.com/tutorials/103

 

I am aware of that but I just want to know the value. I don't have an official power supply for my PC Engine, I am using a multi-voltage supply. Do you know the values from the adaptor and under load?

 

The value from the adapter is completely useless. Value under load should be whats on the PSU. All you need to do is match the value that it says on the label.

Info you need is here: http://www.gamesx.com/wiki/doku.php?id=repair:pcepowersupplies

 

I have seen that chart before, I knew it used 9v and 650mA. I wanted to make sure I was giving the console the same/similar voltage as the original power adapter due to my using a multi voltage adapter.

 

I really dont get what else you want. You need to supply 9v and at least 650mah, there is nothing else you need to know.

What the original adapter supplies without load is completely useless information. Set the multi adapter to 9v and as long as its rated for at least 650ma you are good.

 

I tested the input voltage on the regulator using the multi voltage adapter set to 9v and it gave a reading of over 11v. I just want to know if the official adapter gives a similar reading.

 

Thats exactly what an unregulated PSU will do when there is no load.

 

As Bad_Ad84 is trying to point out measuring an unregulated power supply won't give you the information you're after. The only way to get what you're sorta after is to measure the output while the brick is plugged into a PC-Engine.

Grab yourself a 9v regulated supply capable of pushing an amp and you'll probably be fine.

 

This is what I did. I measured it on the voltage regulator input on the PC Engine.

 

So you got 11v on the INPUT pin of the 7805? you did measure that with the PCE powered ON , right? If it was ON and you got 11v then toss it and a better one.
I use a multi-psu as well, one that outputs 9v/1A and all is working great. Just get a good one, set it on 9v and enjoy the machine.

 

This is why "when plugged in" isnt very helpful. Must be a load on the power supply for it to be correct.

To be fair, even if it was 11v with load, its still within spec of the 7805 anyway.

 

^ sure it's within specs, but would you trust a PSU that when set to 9v outputs 11v?

 

It wont be, its unregulated. Its supposed to be like that.

 

The 7805 takes whatever and makes it 5V anyway doesn't it?

I use a PlayStation 2 slim PSU (8.5V) on my Duo R. Different polarity to other PCE though.

 

If by "a load" you mean switched on then yes, the console was on. I am aware that most electronics have a higher (or lower) tolerance level but I just wanted readings on the original power supply as a comparison.

 

^ Well then, since under load the PSU instead of 9v delivered 11v, I would toss it and use another ... just get a good 9v/1A one and call it a day

 

I have recently acquired a Core Grafx II with official power supply. I tested it under load on the input of the voltage regulator and got a reading of 14.18v.
I'm sure some people (if anyone decides to reply) will say so what, but I just thought I would write a conclusion to my original question.

 

It's not a conclusion, because it is an UNREGULATED supply. Another OFFICIAL supply could give you 12V because.... IT'S UNREGULATED! In fact, measure it again - it may well be another voltage! Why? BECAUSE IT'S UNREGULATED! Likewise, the voltage will change depending on the load - no load (the machine is off) will give a different voltage from when it is under load... and it will vary depending on the load (plugging in a device that runs off the console's power, for example). Also, your meter only measures the mean DC voltage.

I'm not sure why you're unable to grasp this concept. Most PSUs for games consoles ARE unregulated. This means there is NO fixed output voltage. The console has a regulator in it. As long as the regulator gets an input within its operating specifications, it will regulate that voltage to the required voltage (usually 9 volts) and keep it there. A 7805 has an absolute maximum input voltage of 35 volts. Now do you see why it's completely irrelevant?

 

I STILL don't understand. Could you explain it as though you are talking to a lobotomised pigeon?