rhing said:
Sorry I forget to mention about that. I add 100kohm resistors. At this topic people wrote that bass are better with those than 22kohm, next I try 47kohm.
Here is bigger picture from inside.
Black cable that is the ground cable.
And I forget to mention that the caps are 4.7uf.
Hi bequerel, yes that means that the output impedence is 10k.
So far, have not experienced any problems with this - sound wise.
Is there a possibility that this may cause problems with some amplifiers?There is no problem with placing a larger value resistor in paralell as long as the total impedence is optimised for your equipment.
Oh, by the way, I also have used a Denon moiving coil step up transformer unit and that works as well - even greater output level(most likely due to greater step up ratio).
So far, have not experienced any problems with this - sound wise.
Is there a possibility that this may cause problems with some amplifiers?There is no problem with placing a larger value resistor in paralell as long as the total impedence is optimised for your equipment.
Oh, by the way, I also have used a Denon moiving coil step up transformer unit and that works as well - even greater output level(most likely due to greater step up ratio).
Ziggy said:
I do not think that the output impedance is a problem with tube amps, but with a normal transistor amp it could be.
Anyhow I would think that the high output impedance would lead to rolled off treble if you do not use extremely short cables since it will make a filter together with the cables and input impedance of the preamp. However, I am not an expert on this.
Can't say that I have noticed any reduction in high frequencies unless they are way past 16khz or so.
I can confidently say that the sound of the Sony Playstation has reached a new level with these transformers directly on the output.
The sound has a live organic presence that is hard to describe.
I can confidently say that the sound of the Sony Playstation has reached a new level with these transformers directly on the output.
The sound has a live organic presence that is hard to describe.
With output transformers in place, shouldn't you be able to remove the blocking caps? Should improves the sound even more.
--Buckapound
--Buckapound
Buckapound......maybe. Only thing is that then there will be an injection of DC voltage through the transformers which may cause saturation problems - or is the voltage too low for this to occur?
Anyone else like to comment on this?
Anyone else like to comment on this?
output caps
What value blocking caps and resistors would be recommended if I have a 100k input to my preamp? Thanks!
What value blocking caps and resistors would be recommended if I have a 100k input to my preamp? Thanks!
Getting back on track.............anyone like to comment on my output transformers implementation to increase the output level without active amplification????
The sound is truly special and worth further discussion 😉
The sound is truly special and worth further discussion 😉
Stop, please, what do you want us to say?
I think the main thing about transformers is that they operate on AC. DC shouldn't go through them, and I've seen them used as a substitute for blocking caps.
Anybody know if DC voltage can cause core saturation? In theory it sounds reasonable enough, but is this actually a problem in practice?
--Buckapound
I think the main thing about transformers is that they operate on AC. DC shouldn't go through them, and I've seen them used as a substitute for blocking caps.
Anybody know if DC voltage can cause core saturation? In theory it sounds reasonable enough, but is this actually a problem in practice?
--Buckapound
Thanks buckapound.
My question is.........can I do away with the large cap directly after the dac chip and just connect the input side of the transformer?
As my Gainclone amp does NOT have an input cap, will this be dangerous?
My question is.........can I do away with the large cap directly after the dac chip and just connect the input side of the transformer?
As my Gainclone amp does NOT have an input cap, will this be dangerous?
My reading of a few other conversations around here is that you can. It's easy enough to just put a wire temporarily shorting out each cap and taking them out of the signal path, and then check the DC offset at output. No DC, no problem, at least as far as your amp is concerned. Then, hook it up and see how it sounds.
--Buckapound
--Buckapound
I measure 2.3 - 2.4 volts dc at the output of the DAC before the capacitor.
After the capacitor - o volts.
However, something weird is going on, if I short the capacitor with a length of wire, or connect the transformer direct to the DAC output - no sound - nada!I may have made a mistake in haste last night, but did a check and was still puzzled why this was happening.
Attached is a wiring diagram of the transformer.
At the moment I have the red wire attached as positive and the green connected to earth. The black C.T. is left unconnected.
On the other side yellow is positive and blue is ground.
After the capacitor - o volts.
However, something weird is going on, if I short the capacitor with a length of wire, or connect the transformer direct to the DAC output - no sound - nada!I may have made a mistake in haste last night, but did a check and was still puzzled why this was happening.
Attached is a wiring diagram of the transformer.
At the moment I have the red wire attached as positive and the green connected to earth. The black C.T. is left unconnected.
On the other side yellow is positive and blue is ground.
Are you sure that signal ground is tied to Earth? They may have separate signal and Earth grounds.
I know that the output of the DAC definately is. It's what's happening after that is what's weird.
I'll have to check all the connections tonight again, but I'm not sure that I have a wiring problem when bypassing the caps connected to the DAC.
Wonder what the hell is going on?How can it all work with the transformers connected as is, but not when removing the caps
Could it be that the DAC sees a 600ohm impedence and a gross mismatch is the result, producing no sound?
I'll have to check all the connections tonight again, but I'm not sure that I have a wiring problem when bypassing the caps connected to the DAC.
Wonder what the hell is going on?How can it all work with the transformers connected as is, but not when removing the caps
Could it be that the DAC sees a 600ohm impedence and a gross mismatch is the result, producing no sound?
Found the reason for the problem last night.
The input side of the transformer has a D.C. resistance of only 25 ohms. The DAC will see this as a short circuit to ground, hence the need for a capacitor.
Secondly, as a high pass filter is created, the 20uf caps I have been using are way TOO BIG. They will be substituted tonight for a 1.0uf or less.😉
The input side of the transformer has a D.C. resistance of only 25 ohms. The DAC will see this as a short circuit to ground, hence the need for a capacitor.
Secondly, as a high pass filter is created, the 20uf caps I have been using are way TOO BIG. They will be substituted tonight for a 1.0uf or less.😉
are the PS1's still classed as good quality? in todays market, are they alot better than PS3 xbox etc?
I actually asked this before, but I still don't know. I actually bought a new ps1, but have the same problems, it won't play any cd-r's. I did all the adjustments, but it's just not helping. So I think I need to buy a new laser. I bought one already from richpsxparts, and it as faulty. I emailed them several times, and got no response, so...Can anyone recommend a place to buy a replacement laser assembly other then richspsxparts? Also, what would be the best replacement laser for for the scph-1001(ACM, ADM, BAM, AEM)?
I was considering ordering from http://cnn.cn/shop/sony-playstation-c-259_512.html but I don't know which one to order. Will the BAM work with the 1001? I just want to be able to play my cd-r's! lol
Thank you
Joe
I was considering ordering from http://cnn.cn/shop/sony-playstation-c-259_512.html but I don't know which one to order. Will the BAM work with the 1001? I just want to be able to play my cd-r's! lol
Thank you
Joe