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Old 2nd December 2005, 09:38 PM   #201
Mick_F is offline Mick_F  Germany
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Hmmmmmm. I just come from my workbench. I was not able to verify the connection between the outer pads of the first set of caps with the opamp......
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Old 2nd December 2005, 09:44 PM   #202
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There's an 18k resistor between both.

http://www.diyaudio.com/forums/attac...?postid=776664
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Old 2nd December 2005, 09:45 PM   #203
Mick_F is offline Mick_F  Germany
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Back, could you give some more detail on the construction of your PSU? I understood you built a linear PSU with two regulators for 7.6 and 3.6 V, right? Then you connected the pins 1, 3, and 5 of the mainboard connector to the corresponding outputs of the PSU and 2, 4, and 6 to the 0 volt line? What did you do with pin 7 on the board?

Mick
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Old 2nd December 2005, 09:48 PM   #204
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There's a component between the 3.6v line and reset switch but the voltage going to that pin is 3.6v so I think that just connecting it to 3.6v should work.

We'll know when back will reply. but you could try with your dead board
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Old 2nd December 2005, 11:28 PM   #205
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OK so I've disconnected the muting transistors and the only difference is that there's humming when the PSX is off because my leads are long.

There is as much "popping" as when I bypassed the caps.

Since the DAC is always on with the PSX, the popping only happens when the unit is turned on and off. It's not even loud.

To disconnect the muting transistors:

You have to disconnect the ones that are the nearest to the RCA jacks. (The A/V ones are just next to them)
There are two sides to the transistors. One with one pin and one with two pins. The one you want to disconnect is the one with one pin.

Use your smallest flat screwdriver, heat the pin and slide it under the transistor. It should lift. Do the same with the other channel.

That's all!
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Old 2nd December 2005, 11:55 PM   #206
back is offline back  Greece
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Quote:
Originally posted by Mick_F
Back, could you give some more detail on the construction of your PSU? I understood you built a linear PSU with two regulators for 7.6 and 3.6 V, right? Then you connected the pins 1, 3, and 5 of the mainboard connector to the corresponding outputs of the PSU and 2, 4, and 6 to the 0 volt line? What did you do with pin 7 on the board?

Mick
that`s right.

leave the pin 7 disconnected.
if you want to reset turn off and back on the ps1.
if you want a separate reset add a button between no7 and ground.
when you push the button you short circuit the no7 which already have 3.6v and the ps1 resets
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Old 3rd December 2005, 12:02 AM   #207
back is offline back  Greece
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Quote:
Originally posted by DragonMaster
OK so I've disconnected the muting transistors and the only difference is that there's humming when the PSX is off because my leads are long.

There is as much "popping" as when I bypassed the caps.

Since the DAC is always on with the PSX, the popping only happens when the unit is turned on and off. It's not even loud.

To disconnect the muting transistors:

You have to disconnect the ones that are the nearest to the RCA jacks. (The A/V ones are just next to them)
There are two sides to the transistors. One with one pin and one with two pins. The one you want to disconnect is the one with one pin.

Use your smallest flat screwdriver, heat the pin and slide it under the transistor. It should lift. Do the same with the other channel.

That's all!
so you didn`t notice an improvement by disconnecteing the muting transistors?

the popping is the same to mine.
it`s small and only when you turn on-off and reset.
with play,stop,next,etc. there is no popping
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Old 3rd December 2005, 01:21 AM   #208
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Quote:
so you didn`t notice an improvement by disconnecting the muting transistors?
Well I was meaning that there was not more popping than when they are connected only. I didn't talk about the sound.

I can't tell much as I only brought a "The Who" album for testing.

Maybe tomorrow I'll get something better and the PSOne to compare.

The CDs, PSOne, good amp and speakers are at my mother's home and the soldering iron at my father's. I'm always moving between my father's and mother's home, that's the problem.
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Old 3rd December 2005, 10:23 AM   #209
jives11 is offline jives11  Europe
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Quote:
Originally posted by DragonMaster




I can't tell much as I only brought a "The Who" album for testing.

ONLY !

Hope it was "Whos Next" - I love that album

thanks for all the updates
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Old 3rd December 2005, 12:28 PM   #210
Dommi is offline Dommi  Germany
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Hy @all,
my english is not so good, but i hope you understand me. I dont' red all postings, but i use a PS1 1002 for listen CD. I modificate the output stage and the power supply, now i think abou building a tubestage. If you want to see some pictures of my PS1 you can visit my German homepage http://wwwhighend-info.de.
If you have any questions about sound or modification please contact me. I changed the output kapacitors and cuted the mutingstage.
Regards Dommi
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