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Old 11-20-2007, 07:01 PM #17
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Default Re: 220 volts...

Quote:
Originally Posted by lamborgini8
Awesome!

It didn't come with a power supply so I guess its to just connect it up to the same one as my scanner.
So did it come with a PSU or not? :-?


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Old 11-20-2007, 07:11 PM #18
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Default Re: 220 volts...

Quote:
Originally Posted by a_pyro_is
[quote author=lamborgini8 link=1195558894/0#5 date=1195568765]Awesome!

It didn't come with a power supply so I guess its to just connect it up to the same one as my scanner.
So did it come with a PSU or not? :-?[/quote]

No, just the cables that connect to the circuit board.
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Old 11-20-2007, 07:16 PM #19
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Default Re: 220 volts...

Definitely focus on the diode. AC power systems are dirty and quite variable so your input voltage is not a concern. When someone indicates line voltage they are generally discussing the RMS value of the AC voltage meaning that the voltage described is about .707 the peak voltage the line transmits. So you can see that the peak can be upwards of 312 volts. Line currents are passed through transformers in the power supply that are tapped, then rectified, and conditioned/regulated to provide clean DC voltage and current. Your internal circuitry never sees the AC voltage so you are good to go. Now you just need to make sure the DC voltage meets the operating range of the diode and the DC current is enough to allow lasing but low enough not to burn out the diode.

Diodes in a circuit will appear almost like a short circuit because there is very little resistance across the semiconductors when forward biased.
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Old 11-20-2007, 07:29 PM #20
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Default Re: 220 volts...

Quote:
Originally Posted by FrothyChimp
Definitely focus on the diode. AC power systems are dirty and quite variable so your input voltage is not a concern. When someone indicates line voltage they are generally discussing the RMS value of the AC voltage meaning that the voltage described is about .707 the peak voltage the line transmits. So you can see that the peak can be upwards of 312 volts. Line currents are passed through transformers in the power supply that are tapped, then rectified, and conditioned/regulated to provide clean DC voltage and current. Your internal circuitry never sees the AC voltage so you are good to go. Now you just need to make sure the DC voltage meets the operating range of the diode and the DC current is enough to allow lasing but low enough not to burn out the diode.

Diodes in a circuit will appear almost like a short circuit because there is very little resistance across the semiconductors when forward biased.
Hmm thanks.

My dad, who is an electronics engineer, has had a look at it. Apparently it will be find connecting it to the power supply my scanner uses as it does from 110 to 240 volts. Slight problem however... The circuit board it is all connected to hasn't actually been designed very well. It will take the 220 volts straight and use it in the circuit, that whole circuit has the whole 220 volts running through it and doesn't even have housing around it, touch that and im dead.

Another trip to maplin to get some housing for it and then I will test it out.
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Old 11-20-2007, 08:26 PM #21
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Default Re: 220 volts...

...
That ebay item specifically does come w/ a driver / PSU and it does say exactly what you need to make it work. It looks to me like a switchmode power supply which works, essentially, like taking whatever power is input, and always converting to one output.
However, any AC psu will obviously have some AC running through it... duh.
So a housing would probably not be a bad idea.
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Old 11-20-2007, 08:39 PM #22
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Default Re: 220 volts...

Quote:
Originally Posted by BlueFusion
...
That ebay item specifically does come w/ a driver / PSU and it does say exactly what you need to make it work. It looks to me like a switchmode power supply which works, essentially, like taking whatever power is input, and always converting to one output.
However, any AC psu will obviously have some AC running through it... duh.
So a housing would probably not be a bad idea.
Yeah, I found this on maplins. All will fit in there well and will still fit inside my scanners housing.

http://www.maplin.co.uk/module.aspx?...doy=20m11#spec (MB2)
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Old 11-20-2007, 10:33 PM #23
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Default Re: 220 volts...

220V or 240V in mains power terms thats the same voltage.

it makes no odds if you put 240v to something that only says 220v
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