I have a friend with an Antek AN 8225 transformer.
Would this be good to power an F5?
It is listed at 800VA
2 outputs
25V 16Amps
Thanks,
DB
P.S.
I found their info page... looks good to me but I'm no engineer.
Antek - AN-8225
Would this be good to power an F5?
It is listed at 800VA
2 outputs
25V 16Amps
Thanks,
DB
P.S.
I found their info page... looks good to me but I'm no engineer.
Antek - AN-8225
The voltage is high for the standard F5, but should work well for an F5 Turbo:
http://firstwatt.com/pdf/art_f5_turbo.pdf
http://firstwatt.com/pdf/art_f5_turbo.pdf
Even without cascoded j-fets. Risky, but Mr Pass says they will take close to 40 volts before breakdown....I am going to cascode mine however!
Russellc
I found one this... seems about right to me. Is that enough current?
Thanks,
DB
Electrical Characteristics
Outputs2x Power300VA Output VoltageCurrent 18V8.3A
Thanks,
DB
Electrical Characteristics
Outputs2x Power300VA Output VoltageCurrent 18V8.3A
I wuld go for the first one if you already have it
I have been runnung a 2 24 secondary on F5 since last August with no problem.
I will go for twin outputs and big bias if sinks let you
But is your personal choice so I would first find out what output volltagge you need and If you are going to be hapy with small ones you can send me the big traffos for disposall.
I have been runnung a 2 24 secondary on F5 since last August with no problem.
I will go for twin outputs and big bias if sinks let you
But is your personal choice so I would first find out what output volltagge you need and If you are going to be hapy with small ones you can send me the big traffos for disposall.
Now I am completely confused. My Pass schematic calls for rail voltages of 23-25v and 8amps of continuous current with peak current up to 10amps. I thought that the tranny my friend has looked like just the ticket but some think it's too high voltage???
I do have a solution though. My friend is a pro guitar amp constructor... perhaps I will have him build the power supply.
I do have a solution though. My friend is a pro guitar amp constructor... perhaps I will have him build the power supply.
Papa said, on the very first page of the F5Turbo article: "RTFM". That goes for both the original F5 and the F5T variants. Voltage options are explained in detail.
You HAVE to invest yourself into this whole DIY concept else the questions will go on exponentially. I really do not mean to offend, but 10 posts later, you are confused and pretty much giving up?
You HAVE to invest yourself into this whole DIY concept else the questions will go on exponentially. I really do not mean to offend, but 10 posts later, you are confused and pretty much giving up?
You're overlooking a basic rule-of-thumb for power supply design, and perhaps your buddy is, too......
For a properly designed DC power supply, the output (rail) voltage is 1.414 times the input voltage (i.e., the voltage supplied by the transformer secondary winding).
In your case, with a 25 VAC secondary:
25 x 1.414 = 35.35 VDC, per rail.
This is pushing the limit for a "plain vanilla" F5 amp.....which is what the chain of comments (above postings) are telling you.
A hint: If you are missing this simple power supply design point, building the F5 itself may be a challenge for you. You should really study the design topology (and understand it), and know what your bias settings do to the amp in practice. Read the First Watt articles, and browse the (long) F5 thread and F5 Turbo materials. It will help you quite a bit.
If you go with a simple F5, I'd recommend you scrap your current transformer. I'd also recommend you send it to me for proper disposal--but only, of course, if it has dual primaries I can be configured for 120 VAC mains.... 🙂
For a properly designed DC power supply, the output (rail) voltage is 1.414 times the input voltage (i.e., the voltage supplied by the transformer secondary winding).
In your case, with a 25 VAC secondary:
25 x 1.414 = 35.35 VDC, per rail.
This is pushing the limit for a "plain vanilla" F5 amp.....which is what the chain of comments (above postings) are telling you.
A hint: If you are missing this simple power supply design point, building the F5 itself may be a challenge for you. You should really study the design topology (and understand it), and know what your bias settings do to the amp in practice. Read the First Watt articles, and browse the (long) F5 thread and F5 Turbo materials. It will help you quite a bit.
If you go with a simple F5, I'd recommend you scrap your current transformer. I'd also recommend you send it to me for proper disposal--but only, of course, if it has dual primaries I can be configured for 120 VAC mains.... 🙂
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Cool.
I guess 18 x 1.4 puts me right in the voltage zone.
Thanks,
DB
P.S.
My F5 boards are heat sinked and up and running from my friend's bench power supply. He worked with me through the initial start up as per Pass's instructions.
I guess 18 x 1.4 puts me right in the voltage zone.
Thanks,
DB
P.S.
My F5 boards are heat sinked and up and running from my friend's bench power supply. He worked with me through the initial start up as per Pass's instructions.
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