WD Phono III Clone Questions!
- pre65
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#16
And it gives you the 9V to feed the heater circuit 5V regulator.
I just happen to have some 9V transformers, two toroids and two frame.
Choices /decisions.
I just happen to have some 9V transformers, two toroids and two frame.
Choices /decisions.
The only thing necessary for the triumph of evil is for good men to do nothing.
Edmund Burke
G-Popz THE easy listening connoisseur. (Philip)
Edmund Burke
G-Popz THE easy listening connoisseur. (Philip)
- Mike H
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#17
pre65 wrote:And it gives you the 9V to feed the heater circuit 5V regulator.
We assume the power isn't a lot for that
"No matter how fast light travels it finds that the darkness has always got there first, and is waiting for it."
#18
3 * ECC83Mike H wrote:pre65 wrote:And it gives you the 9V to feed the heater circuit 5V regulator.
We assume the power isn't a lot for that
Whenever an honest man discovers that he's mistaken, he will either cease to be mistaken or he will cease to be honest.
- pre65
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#19
Pre 3 is two ECC82, so 0.6A in total.Mike H wrote:pre65 wrote:And it gives you the 9V to feed the heater circuit 5V regulator.
We assume the power isn't a lot for that
The only thing necessary for the triumph of evil is for good men to do nothing.
Edmund Burke
G-Popz THE easy listening connoisseur. (Philip)
Edmund Burke
G-Popz THE easy listening connoisseur. (Philip)
- pre65
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#21
I think Nick is talking about the Phono 3 but I want a PSU for Pre 3. They both share the same HT (ie 250V)
The only thing necessary for the triumph of evil is for good men to do nothing.
Edmund Burke
G-Popz THE easy listening connoisseur. (Philip)
Edmund Burke
G-Popz THE easy listening connoisseur. (Philip)
- pre65
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- Posts: 21400
- Joined: Wed Aug 22, 2007 11:13 pm
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#23
Normally, the World Designs modular pre amp (Pre3) and phone pre amp (Phono3) share a common power supply (PSU3) which has two outlets.Mike H wrote:It's all beyond me
Seems that if you have a separate PSU for each pre there is a performance gain.
Savvy ?
The only thing necessary for the triumph of evil is for good men to do nothing.
Edmund Burke
G-Popz THE easy listening connoisseur. (Philip)
Edmund Burke
G-Popz THE easy listening connoisseur. (Philip)
#25
Looks like 1K resistor is required to drop the voltage to 250VMike H wrote:That's the $65,000 question! Offhand no idea, Duncan's PSU designer might give you a clue, otherwise means experimenting. Whatever it is will depend on the total current drain. Do we know what that will be?
Will dig it out tomorrow and have a play with it to see if I can get it to the voltage I want using the resister before the bridge.
Cheers
#26
So i guess the 2 9v secondary tx's are used mainly because its cheaper?
Just wondered if it was done that way because it had other benefits over a transformer with 2 secondaries, or using 240-240 and a 240-9 (which is what ive done)
I think the old TX i used in mine is WAY over rated, its bigger than the TX for my kel84
Just wondered if it was done that way because it had other benefits over a transformer with 2 secondaries, or using 240-240 and a 240-9 (which is what ive done)
I think the old TX i used in mine is WAY over rated, its bigger than the TX for my kel84
#27
Well, lets assume I don't know what I am talking about, I was just going by the topic of the thread and the fact my circuit for a phono II clone was linked to.pre65 wrote:I think Nick is talking about the Phono 3 but I want a PSU for Pre 3. They both share the same HT (ie 250V)
Whenever an honest man discovers that he's mistaken, he will either cease to be mistaken or he will cease to be honest.
#28
Mainly because its what I had, it does provide a bit more isolation as well.So i guess the 2 9v secondary tx's are used mainly because its cheaper?
Whenever an honest man discovers that he's mistaken, he will either cease to be mistaken or he will cease to be honest.
#30
Well, maybe it will avoid confusion if you start your own thread, this one started about the phono III as far as I can see.pre65 wrote:I think Nick is talking about the Phono 3 but I want a PSU for Pre 3. They both share the same HT (ie 250V)
Whenever an honest man discovers that he's mistaken, he will either cease to be mistaken or he will cease to be honest.