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Old 22nd December 2005, 09:23 AM   #431
Mick_F is offline Mick_F  Germany
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Quote:
Originally posted by Dommi



Hi Mick,
where can i get the connectors you used ? I found only connectors with a pin power rating of 1 Amp. Or is 1 Amp. sufficient ?
Thanks
Dommi

I confess that I built these in before I heard of backs finding that the PS1 draws such high currents. I bought them at an ordinary local electronics store and I have no idea about their current rating. They may well be underrated...

I must say that I am still not absolutely convinced that the PS1 draws currents as high as 5 amperes, and I resolve to make a measurement myself.

Mick
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Old 22nd December 2005, 09:26 AM   #432
Mick_F is offline Mick_F  Germany
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Quote:
Originally posted by Dommi
@mick and pieroh
Yes, please try it, but the Gain Adjust is 1,75 Volt, not 1,65 as i discribed in my first post. The most important think is imho to adjust the Laserintensity first, and than the bias and than the gain.

BR Dommi
How do you adjust the laser intensity?

Mick
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Old 22nd December 2005, 09:47 AM   #433
Dommi is offline Dommi  Germany
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Quote:
Originally posted by Mick_F


How do you adjust the laser intensity?

Mick
You have to adjust the Laser at 11,4 mV for short connection cable and 24,4 mV for long connection cable. Turn on the PS, push the cover close switch, you have to messure while the laser moves up and down.
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Old 22nd December 2005, 12:26 PM   #434
back is offline back  Greece
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Quote:
Originally posted by Mick_F



I confess that I built these in before I heard of backs finding that the PS1 draws such high currents. I bought them at an ordinary local electronics store and I have no idea about their current rating. They may well be underrated...

I must say that I am still not absolutely convinced that the PS1 draws currents as high as 5 amperes, and I resolve to make a measurement myself.

Mick
hey mick i didn`t measure ps1`s current draw i just made
the first psu with lm3172AMPS and it couldn`t start.
then i added the 2n 3055 and it works ok.

the original psu`s rectifiers are rated 6 AMPS.
my guess is it`s somewhere between 3.5-4.5 AMPS and most of it
goes to the transports motor.
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Old 22nd December 2005, 12:32 PM   #435
pieroh is offline pieroh  Germany
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Wink PS1 Tech Award

Hi Mick and Dommi,
For your research I nominate you for the PS1 DIY Tech Award 2006!
Peter
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Old 22nd December 2005, 01:33 PM   #436
pieroh is offline pieroh  Germany
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Quote:
Originally posted by back


hey mick i didn`t measure ps1`s current draw i just made
the first psu with lm3172AMPS and it couldn`t start.
then i added the 2n 3055 and it works ok.

the original psu`s rectifiers are rated 6 AMPS.
my guess is it`s somewhere between 3.5-4.5 AMPS and most of it
goes to the transports motor.

Hi back,
did you use the pinning as posted by Dragon Master (Post 80, 26.11.05))?
Peter
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Old 22nd December 2005, 01:48 PM   #437
Mick_F is offline Mick_F  Germany
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Quote:
Originally posted by Dommi


You have to adjust the Laser at 11,4 mV for short connection cable and 24,4 mV for long connection cable. Turn on the PS, push the cover close switch, you have to messure while the laser moves up and down.

Thanks Dommi, that was new to me!

Mick
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Old 22nd December 2005, 01:50 PM   #438
Mick_F is offline Mick_F  Germany
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Quote:
Originally posted by back


hey mick i didn`t measure ps1`s current draw i just made
the first psu with lm3172AMPS and it couldn`t start.
then i added the 2n 3055 and it works ok.

the original psu`s rectifiers are rated 6 AMPS.
my guess is it`s somewhere between 3.5-4.5 AMPS and most of it
goes to the transports motor.
Back, I know you didnt measure it, thats why I am so bold to have my doubts.

I will make measurements and let you know what I found.

Mick
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Old 22nd December 2005, 08:03 PM   #439
Mick_F is offline Mick_F  Germany
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Ok, here is the latest research report from the workshop:

I have measured the currents from the PSU to the Mainboard.

Pin 1 (7.6 V): 0.3 - 0.5 mA when running, 0.2 mA when stopped. Peak current when the motor starts is about 0.6 mA.

Pin 3 (3.6 V): 0.5 mA when running and when stopped.

Pin 5 (3.6 V): Could not measure any current.

Back, I am sure that the currents are not higher. I have measured with my DMM set in the mV range and the fuse did not blow. Btw, that of course is also a means to test the upper limit of the current. Just connect the PSU through a low-amp fuse and see if it blows.
Maybe something else was wrong with your first PSU approach....


I have also measured the Voltage on the solder blob on the flat cable to the laser unit. I found 12.7 mV. I guess the cable I use is the short one, so I may lower it a little bit.

Mick
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Old 22nd December 2005, 08:11 PM   #440
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0.3 milliamps??? A LED is 21mA...

How have you measured the amps? Have you put your DMM in series with the cable, and have you plugged the red test lead in the good socket?
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