I don't see any reason you couldn't do this just feed each board a balanced signal.
Thanks, Wayne,
I suspected it will works, but it is nice to hear from its designer.
So there isn't any obstacles against it, other than that I need a second PCB.
Can you send me a new invoice, or I just simple send 55$ to you Pay-Pal account?
Regards,
Gyuri
I suspected it will works, but it is nice to hear from its designer.
So there isn't any obstacles against it, other than that I need a second PCB.
Can you send me a new invoice, or I just simple send 55$ to you Pay-Pal account?
Regards,
Gyuri
Could someone measure the primary and secondary DC resistance of the TALEMA PCB toroid transformer?
I´ve about 6 ohm for one secondary?
JP
I´ve about 6 ohm for one secondary?
JP
Regulators are FP type.
Mosfet becomes a condom, ordered for 2 hours.
Have big problems with inrush current: Toroidal death or filter cmc + toroidal blows 2A slow bow fuse!
JP
Mosfet becomes a condom, ordered for 2 hours.
Have big problems with inrush current: Toroidal death or filter cmc + toroidal blows 2A slow bow fuse!
JP
2 amp slow blow should work fine. I measured my secondaries at 4-6 Ohms depending on transformer VA.
230 Ohm primary and 6 Ohms secondary with 230V and 15VA.
2A blows! Will check without main filter...
JP
2A blows! Will check without main filter...
JP
I have 2x 25VA Talema and 0.5A slow blow for my F5-HA.
Never have had a problem.
So something else wrong.
Patrick
Never have had a problem.
So something else wrong.
Patrick
Hello Patrick,
do you use in your F5-HA main filter with CMC?
My Schurter main filter includes an 2x4mH CMC; main filter checked ok (removing middle point connexion of toroidal 230v side) with 2A SB fuse.
As always, I think something really stupid is going on (perhaps wrong fuse? Ordered new ones).
JP
do you use in your F5-HA main filter with CMC?
My Schurter main filter includes an 2x4mH CMC; main filter checked ok (removing middle point connexion of toroidal 230v side) with 2A SB fuse.
As always, I think something really stupid is going on (perhaps wrong fuse? Ordered new ones).
JP
I have two questions:
Are there any penalties (soundwise) if I would be used Fairchild FQP3N30/FQP3P20 pairs instead of Toshiba 2SK2013/2SJ313 pairs?
Need I change to something in the schematic?
Regards:
Gyuri
Are there any penalties (soundwise) if I would be used Fairchild FQP3N30/FQP3P20 pairs instead of Toshiba 2SK2013/2SJ313 pairs?
Need I change to something in the schematic?
Regards:
Gyuri
The Fairchild parts work just fine. Sound is very close between the two I can't tell the difference maybe some can.
Thanks guys,
I asked because I have two pairs of 2SK2013/2SJ313 for one PCB, and virtually countless pairs of FQP3N30/FQP3P20.
Then I will order missing parts for two boards.
(Wayne, have you got the money for second board?)
Another thought, can I raise power supply voltages?
Because if I can understand it well, with Fairchild pairs output voltage swing will be lower. Not if it count if I only drive headphones with it, perhaps I would drive my balanced F4 with it.
Any suggestion in this regard?
I asked because I have two pairs of 2SK2013/2SJ313 for one PCB, and virtually countless pairs of FQP3N30/FQP3P20.
Then I will order missing parts for two boards.
(Wayne, have you got the money for second board?)
Another thought, can I raise power supply voltages?
Because if I can understand it well, with Fairchild pairs output voltage swing will be lower. Not if it count if I only drive headphones with it, perhaps I would drive my balanced F4 with it.
Any suggestion in this regard?
Thanks Patrick,
Of course I know that there are limits for opamps PS voltages, despite I'm Wacky One. Although OPA2604 doc says to me max.+-24V operating voltage range.
Of course I know that there are limits for opamps PS voltages, despite I'm Wacky One. Although OPA2604 doc says to me max.+-24V operating voltage range.
> will severely limit your choice of opamp ....
So other than OPA2604, which other ones can you choose ?
Unless of course you already decided to use OPA2604, then by all means.
The MOSFET will take it with easy.
Patrick
So other than OPA2604, which other ones can you choose ?
Unless of course you already decided to use OPA2604, then by all means.
The MOSFET will take it with easy.
Patrick
You know Patrick, I haven't decided anything yet, except that it will be in balanced configuration.
