Naah, not too off-topic, its just that most of us never get around to building a yacht for our playstations...
Hi @all,
again the question i posted before.
I have a question about the Gain and Bias adjust some of you've done. I've adjusted about 5 PS1 with different laserunits and if i take the value of Bias 1,7 V and Gain 1,85 Volt most of the CD don't started. My values with all laserunits are : Bias 1,54 V and Gain 1,75 V. I wonder why with Mick values my PS don't read all CD `s.
Any experiences ?
Dommi
again the question i posted before.
I have a question about the Gain and Bias adjust some of you've done. I've adjusted about 5 PS1 with different laserunits and if i take the value of Bias 1,7 V and Gain 1,85 Volt most of the CD don't started. My values with all laserunits are : Bias 1,54 V and Gain 1,75 V. I wonder why with Mick values my PS don't read all CD `s.
Any experiences ?
Dommi
Laser unit SCPH1002
Hi Dommi,
I set up the bias and gain as Mick described and it works. The laser unit seems to very sensitive to abrasion ans sometimes when I start the machine it is not able to read a CD and hangs-up. The only cure is to reset.
Peter
Hi Dommi,
I set up the bias and gain as Mick described and it works. The laser unit seems to very sensitive to abrasion ans sometimes when I start the machine it is not able to read a CD and hangs-up. The only cure is to reset.
Peter
Dommi said:
Sorry for my late answer. I didnt notice that the thread was going on .....
Good question. I have those values from a site for PS1 players. It works fine with most of my CDs, and I have used to for adjusting all of my PS1s up to now. Maybe your values are even better...?!? I will try it on occasion.
Mick
Werner Rem said:
Very nice boat, Werner. I grew up in Holland (close to Leiden) and our neighbour also had such a boat. I remember very nice and relaxing boat trips during summer........
Mick
@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
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
Dommi said:
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
Mick_F said:
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.
PS1 Tech Award
Hi Mick and Dommi,
For your research I nominate you for the PS1 DIY Tech Award 2006!
Peter
Hi Mick and Dommi,
For your research I nominate you for the PS1 DIY Tech Award 2006!
Peter
back said:
Hi back,
did you use the pinning as posted by Dragon Master (Post 80, 26.11.05))?
Peter
back said:
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
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
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
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?
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?