Weird. I'm looking under "Power Transformers" and then through the various "Toroidal Transformers" sub-categories. Nothing I've found so far has an option for primaries - just secondaries. I guess I'll just email them.
I've built 3 different V3 Power Supplies with 300 VA, 400VA, and 500VA Antek transformers. All the other parts are common between the PSUs but I ordered whatever Antek was in stock at the time I built the PSU.
Now I am thinking about using two of the PSUs I have built to do a dual mono power supply for one of my First Watt amps. Will it matter that the transformers have different VA ratings? The easiest for me to build would pair the 300VA and 500 VA transformers so quite different.
Now I am thinking about using two of the PSUs I have built to do a dual mono power supply for one of my First Watt amps. Will it matter that the transformers have different VA ratings? The easiest for me to build would pair the 300VA and 500 VA transformers so quite different.
Thanks. I'm guessing that none of the First Watt amps based on 24V rails draws more than 300 VA especially in a dual mono version?
I am a complete novice (so I assume there is a reason why I don't see people doing it) but I'm just going to throw this out there and hopefully learn something.
Why not add a DC-DC constant voltage widget like this:
https://www.amazon.com/HiLetgo-Adjustable-Step-Up-Constant-Converter/dp/B07T137H2Y
to the output of the diyAudio universal PSU board and then have the ability to easily adjust the rail voltage?
Inefficient? Or problematic?
Why not add a DC-DC constant voltage widget like this:
https://www.amazon.com/HiLetgo-Adjustable-Step-Up-Constant-Converter/dp/B07T137H2Y
to the output of the diyAudio universal PSU board and then have the ability to easily adjust the rail voltage?
Inefficient? Or problematic?
@Minarai That device will take the very well smoothed and conditioned DC from the universal PSU, turn it into (very ugly and noisy) AC to boost or buck the voltage, then re-rectify back into (still noisy) DC, and filter it a teeny bit so the most egregious and nasty bits are smoothed a little, but all the work the universal board did to make beautiful and clean DC with the huge capacitors and filter resistors is now gone.
Well, I was thinking of using this chassis and PSU with various amp boards. Specifically right now, F5 and Modulus-86. The former wants 23v and the latter 30v. Is there a singe voltage point that would work ok for either? Probably.
But I am just curious if there is a design flaw with using that type of DC-DC circuit here. I believe the Universal PSU board is not a CC power supply. Maybe that's important and adding this bit is a bad idea (I am already out of my depth).
Any feedback on the implication of this configuration would be educational for me.
If it does no harm, other than increase the power consumption a little bit, I would probably be tempted to try it, at least for the early days of comparing various amp builds with their ideal input voltage.
But I am just curious if there is a design flaw with using that type of DC-DC circuit here. I believe the Universal PSU board is not a CC power supply. Maybe that's important and adding this bit is a bad idea (I am already out of my depth).
Any feedback on the implication of this configuration would be educational for me.
If it does no harm, other than increase the power consumption a little bit, I would probably be tempted to try it, at least for the early days of comparing various amp builds with their ideal input voltage.
Consider me fully warned off.
I asked without knowing how these 'buck boosts' work, which might be a little rude of me but its really helpful to hear it straight from the experts. I'm reading a little about it now and I see how the PWM signal created by that circuit board is a huge step back from the nicely smoothed DC coming from the universal PSU board.
Thanks for the help,
I asked without knowing how these 'buck boosts' work, which might be a little rude of me but its really helpful to hear it straight from the experts. I'm reading a little about it now and I see how the PWM signal created by that circuit board is a huge step back from the nicely smoothed DC coming from the universal PSU board.
Thanks for the help,
I plan on building the universal PSU for the Aleph J. I have 500 VA 2x22V transformer and two sets of capacitors, 8x15000 micF Elna (https://www.audiophonics.fr/en/cond...p-12662.html?search_query=elna&fast_search=fs) and 8x Cornell Dubilier 47000 micF 35V from Mouser ( 380LX473M035A082). I have two Qs
1. What is the best set of capacitors to use?
2. How many 0.47 ohm 3W resistors should I use?
1. What is the best set of capacitors to use?
2. How many 0.47 ohm 3W resistors should I use?