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Old 30th November 2005, 04:08 PM   #151
back is offline back  Greece
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i used an external 13.8volt 7A psu and used 2 LM 317K to take out
7.6v and 3.6v.
it didn`t work.
the LM317K can`t handle the current.
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Old 30th November 2005, 04:16 PM   #152
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Quote:
Originally posted by jives11
Thanks back, but I thought the second set of caps were for AV, while the first and third were for the RCA ?
i can`t tell you about that because mine have only one pair i just quess that the first pair is common and after that we have two paths.

mine have two more caps (c5,c5)
but they connect from the output to the ground don`t be confused with them.
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Old 30th November 2005, 04:17 PM   #153
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Hi, I don't really know, if this helps...found it in dah web.

I think it's the output-stage.

C423 and C424 are 10F (I think so)
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Old 30th November 2005, 04:20 PM   #154
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Thanks

I think that is for the AV output. Mine also has RCA outputs which use a single JRCOpamp as a buffer. My previous understanding is that the of the two rows of 2 10uF caps, the middle ones are C424 & C423 in your diagram.

The outer two pairs are can be seen in an earlier post by dragonmaster showing the RCA circuit.

I guess the safe bet would be to remove all and short all ?
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Old 30th November 2005, 04:26 PM   #155
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Quote:
Originally posted by jives11
Thanks

I think that is for the AV output. Mine also has RCA outputs which use a single JRCOpamp as a buffer. My previous understanding is that the of the two rows of 2 10uF caps, the middle ones are C424 & C423 in your diagram.

The outer two pairs are can be seen in an earlier post by dragonmaster showing the RCA circuit.

I guess the safe bet would be to remove all and short all ?
it`s easier to do what i told you have to keep the mute or else you will have noises when you press stop,play etc. from the dc offset.
i have noise only when i turn it off and on but i turn down the amps volume first and i am ok.
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Old 30th November 2005, 07:57 PM   #156
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Hi, recieved my spch-1002 in the mail today and thought of something. When using a remote, how do you get past the initial "choose memorycard or Audio"-screen if the TV isn't connected?
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Old 30th November 2005, 09:04 PM   #157
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Quote:
Thanks back, but I thought the second set of caps were for AV, while the first and third were for the RCA ?
Yup!

Quote:
i can`t tell you about that because mine have only one pair i just quess that the first pair is common and after that we have two paths.
Nope, the first and second pair inputs are connected in parallel. Then the first pair's output goes to the opamp and the second pair goes to A/V out.


Quote:
mine have two more caps (c5,c5)
but they connect from the output to the ground don`t be confused with them.
These are also there on the 100x's A/V connector. I haven't found any for the RCA jacks.

Quote:
Hi, I don't really know, if this helps...found it in dah web.

I think it's the output-stage.
It was posted by Mick a couple of pages before.
Here: http://www.diyaudio.com/forums/showt...749#post774749
But this one is just for A/V MULTI OUT like jives11 stated.

I also DIYed the schematic for the RCA plugs here:
http://www.diyaudio.com/forums/showt...664#post776664

Quote:
how do you get past the initial "choose memorycard or Audio"-screen if the TV isn't connected?
Put a CD in it. If it doesn't work while it's powered on, put the CD before starting the unit or press reset when inserting it.


Quote:
it`s easier to do what i told you have to keep the mute or else you will have noises when you press stop,play etc. from the dc offset.
i have noise only when i turn it off and on but i turn down the amps volume first and i am ok.
And what about the muting transistors? Maybe we should just put some relays at the output that are activated by the same trigger as the current ones?

Quote:
i used an external 13.8volt 7A psu and used 2 LM 317K to take out
7.6v and 3.6v. it didn`t work. the LM317K can`t handle the current.
Have you tried with LM338? It's a 5A version of the 317.
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Old 30th November 2005, 09:29 PM   #158
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Quote:
Originally posted by DragonMaster


And what about the muting transistors? Maybe we should just put some relays at the output that are activated by the same trigger as the current ones?


Have you tried with LM338? It's a 5A version of the 317.

you think it we`ll gain something by replacing the transistors with relays?

no i didn`t try 338 because i couldn`t find it.
actualy i couldn`t find anything adjustable stronger than 317
so i will add two 2N3055 tomorrow driven by the LM317`s
we will know tomorrow how it sounds.

i think the original psu is not stabilised it just have two big caps
one 820 uf and one 560 uf
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Old 30th November 2005, 09:47 PM   #159
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Quote:
you think it we`ll gain something by replacing the transistors with relays?
I thought it was a well-known mod for CD players.

Well, the transistors are supposed to add more distortion to the sound.

Replacing by relays should not be requiered, just preventing pops. Disconnecting the first and 3rd pair and putting a jumper wire should do the job easily.

You could try multiple LM317s in parallel also.

Something that would be helpful to know would be how much current each lines draw.

Most SMPSes don't have a lot of filtering at the output as far as I know.
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Old 30th November 2005, 11:01 PM   #160
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Quote:
Originally posted by DragonMaster


I thought it was a well-known mod for CD players.

Well, the transistors are supposed to add more distortion to the sound.

Replacing by relays should not be requiered, just preventing pops. Disconnecting the first and 3rd pair and putting a jumper wire should do the job easily.

You could try multiple LM317s in parallel also.

Something that would be helpful to know would be how much current each lines draw.

Most SMPSes don't have a lot of filtering at the output as far as I know.
after i finish the psu i will try the dac output leg`s 15 and 16
straight to the rca`s to see if i will have noise because removing them is one way road.

i will add two 2N3055 to finish with it (15A max)

i think the 1.5A of 317 is enough but the peak current of the motor when it starts is big
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