After a couple of email exchanges with Peter Daniels, he says he doesn't have them in stock; though no further info on when the new boards (if any) will be ready. Let's sit tight and wait patiently
Cheers~
Cviller just posted he has a few up for sale, I've only built with Peter's, but many I know have also used Cviller's boards. Similarly, Tech-DIY is supposed to be offering kits soon....Peter did tell me he still had plenty of power supply boards.
russellc
I am building a pair of F5 monoblocks. Each one with a transformer, a full diode bridge for each rail, and four 22.000uF caps with the 4x 0.1r 3w each full dual rail board.
Only one quick question: Is it ok if I put jumpers as in the way shown on the attached picture? These pads will be unused, so I am guessing that placing 3 of them could be better for making a dual supply PSU. I don't think it will make a ground loop.
Power will be taken to an F5 board from the marked outputs. These are your F5 boards. There is a wire from the F5 ground pad to the marked pad on the picture. The return of the speaker will go where marked in the picture.
Can anyone give it a quick look and check if it is alright?
FYI, it will carry all caddock MK132, and Mills for the power resistors. Capacitors are Mundorf MLytic SI, Schottky TO-247 rectifiers
I don't think I will place the thermistor and the current limiter circuitry on the F5. I want that bunch of small Hi-Q resistors and pairs of caps sounding at their bests. Adding more stuff get close to double the amount of components in the circuit.
Thanks, regards
Regi
Only one quick question: Is it ok if I put jumpers as in the way shown on the attached picture? These pads will be unused, so I am guessing that placing 3 of them could be better for making a dual supply PSU. I don't think it will make a ground loop.
Power will be taken to an F5 board from the marked outputs. These are your F5 boards. There is a wire from the F5 ground pad to the marked pad on the picture. The return of the speaker will go where marked in the picture.
Can anyone give it a quick look and check if it is alright?
FYI, it will carry all caddock MK132, and Mills for the power resistors. Capacitors are Mundorf MLytic SI, Schottky TO-247 rectifiers
I don't think I will place the thermistor and the current limiter circuitry on the F5. I want that bunch of small Hi-Q resistors and pairs of caps sounding at their bests. Adding more stuff get close to double the amount of components in the circuit.
Thanks, regards
Regi
Attachments
Yes, Andrew, they are connected on the underside.
Teabag, I understand that you are joining both rail's grounds between the two gnd pads under and above the marked v+/v- output pads? Then, in which pads are you soldering the ground from the F5 board and the return from the speaker?
I'll do the same drawing in the underside, it should be clearer for you guys.
Sorry for a minor mistake. I wrongly drawed the connections from the diode bridges on the previous post. Not important for the matter.
Teabag, I understand that you are joining both rail's grounds between the two gnd pads under and above the marked v+/v- output pads? Then, in which pads are you soldering the ground from the F5 board and the return from the speaker?
I'll do the same drawing in the underside, it should be clearer for you guys.
Sorry for a minor mistake. I wrongly drawed the connections from the diode bridges on the previous post. Not important for the matter.
Attachments
When you actually say "it", what are you referring to?
Can I use some pads for the task of connecting spk return, signal ground, earthing...?
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And is there an elegant way of performing it? I am afraid the only solution to be a bunch of flying cables soldered to a copper jumper. That couldn't be an option with such a nice board
Can you post a picture of yours?
I haven't yet found an elegant way to hook up grounds. Its a pity doing that way having so many holes on the PSU board.
On another matter, I've seen that the recommended transformers are around 250VA or 300VA ratings. I know these are recommended values for long term stability, lower heat, constant current class A consumption, bla bla bla...
But in practice, if my maths are right, one F5 channel would consume 1.3A times 36v (2x18vac voltage swing), which is around 47VA.
Now my question is not wether is it recommended a 47VA trafo (I know it isn't), but if one F5 channel just consumes 47VA.
Does one F5 channel needs just 47VA?
On another matter, I've seen that the recommended transformers are around 250VA or 300VA ratings. I know these are recommended values for long term stability, lower heat, constant current class A consumption, bla bla bla...
But in practice, if my maths are right, one F5 channel would consume 1.3A times 36v (2x18vac voltage swing), which is around 47VA.
Now my question is not wether is it recommended a 47VA trafo (I know it isn't), but if one F5 channel just consumes 47VA.
Does one F5 channel needs just 47VA?
it's mainly due to the heating effect in the primary and the secondary depending on I^2 rather than simply I.
The current pulses that charge up a capacitor input filter demand that the transformer be de-rated according to the manufacturer's data.
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