For Class AB amps they don’t get hot at all and no heatsink needed. For Class A you can calculate the heat using voltage drop. For example, a Class A amp drawing 2.5A would be 0.7v x 2 diodes x 2.5A = 3.5W.
Hello, here is a newbie question. According to the values, you could also drive the NP AB100, right?
What's the deal with what look to be redundant components on the BOM & schematic, one in SMT and one in thru-hole? We're just supposed to populate one of them, right?
Does one offer better performance, or why are there 2 options for so many of the capacitors and a few resistors?
Does one offer better performance, or why are there 2 options for so many of the capacitors and a few resistors?
Yes, use just one. It’s supposed to offer flexible stuffing options. Often we use whatever we can find for scraps on our bench drawers to make PSU’s like this. X7R MLCC SMT caps are very good for low ESR bypass applications. However, they can be piezoelectric (that is, mechanically vibrate if exposed to to high amplitude AC signals). So for bypass caps directly exposed to AC before rectification, I would use film caps.
These were built with scraps from the bench. The only items I bought specifically were the large 15,000uF caps.
These were built with scraps from the bench. The only items I bought specifically were the large 15,000uF caps.
Maybe I'm missing it, but what value should R101 and R102 be? The BOM and schematic just say "TBD" for the resistance value
Cool, thanks bloqhed.
Xrk (or anyone else), does that one actually need to be 0.1% 50PPM?
Or is 1% 100PPM ok?
Xrk (or anyone else), does that one actually need to be 0.1% 50PPM?
Or is 1% 100PPM ok?
Where did the 0.1% spec come from? On a PSU, even 5% is fine.
Basic 1% tolerance is good enough for 99% of projects.
The only place where 0.1% is needed are resistors that set precise gain on a preamp or buffer, etc.
Basic 1% tolerance is good enough for 99% of projects.
The only place where 0.1% is needed are resistors that set precise gain on a preamp or buffer, etc.
Thought so. Sorry, I misspoke a bit. The Excel BOM calls for 1%, 50PPM.
The 0.1% spec came from post 361 of the FH9HVX thread as referenced above. Likely because the only 50PPM version of that resistor that's available on Mouser is 0.1%.
I'll just go with the 1% 100PPM version.
The 0.1% spec came from post 361 of the FH9HVX thread as referenced above. Likely because the only 50PPM version of that resistor that's available on Mouser is 0.1%.
I'll just go with the 1% 100PPM version.
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Hi Forum members,
Looking for some feedback from more experienced builders as I plan a PSU for my FH9HVX build. I have already populated the amplifier boards with the intent of sticking with the amplifier as originally designed. I'm a beginner so I don't want to "mess with success." I will attach the schematic for the amplifier to this post.
My goal for this PSU is simplicity and economy of space. I was thinking along the lines of an Antek AN-3232 paired with one All Cees board, then split between the two amplifier boards. I don't know if this is 1. Functionally practical or 2. The best way to achieve my goal. Advice totally appreciated here. Power supplies confuse me. Once I decide on transformer and pcb layout I can move on to the BOM for the All Cees board regarding any needed modifications to the components. Thanks everyone.
Dave M.
Looking for some feedback from more experienced builders as I plan a PSU for my FH9HVX build. I have already populated the amplifier boards with the intent of sticking with the amplifier as originally designed. I'm a beginner so I don't want to "mess with success." I will attach the schematic for the amplifier to this post.
My goal for this PSU is simplicity and economy of space. I was thinking along the lines of an Antek AN-3232 paired with one All Cees board, then split between the two amplifier boards. I don't know if this is 1. Functionally practical or 2. The best way to achieve my goal. Advice totally appreciated here. Power supplies confuse me. Once I decide on transformer and pcb layout I can move on to the BOM for the All Cees board regarding any needed modifications to the components. Thanks everyone.
Dave M.
I totally forgot to include the specs on the transformer. Sorry!
Heres the data sheet. Thanks again.
Heres the data sheet. Thanks again.
Nice work so far Dave!
The limitation with the All Cee’s for two channels is total capacitance that will fit on the pcb. 30mm diameter is max size which cuts down your selection of 63V capacitors.
Does your chassis have enough room for possible dual mono psu? (two trafos and two All Cee’s boards)
Also, pick an ‘AS’ Antek transformer model, 400va and lower all have a magnetic shield wire. (AN models don’t)
The limitation with the All Cee’s for two channels is total capacitance that will fit on the pcb. 30mm diameter is max size which cuts down your selection of 63V capacitors.
Does your chassis have enough room for possible dual mono psu? (two trafos and two All Cee’s boards)
Also, pick an ‘AS’ Antek transformer model, 400va and lower all have a magnetic shield wire. (AN models don’t)
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Thank you for your insights Vunce. I appreciate it. I'm not fundamentally opposed to dual mono. It just sounded more complicated and I was trying to keep the size of the chassis down.
On the other hand, I've heard much positive commentary on the soundstage of dual mono. Additionally, I've not yet purchased a chassis so I have flexibility in that area. I will do some reading of the All Cees thread (and anything else I can find) so that I can gather my thoughts. I have to say that as a HiFi hobbyist, it's hard to resist the temptation of an approach that "improves the sound." Cheers. Dave M.
On the other hand, I've heard much positive commentary on the soundstage of dual mono. Additionally, I've not yet purchased a chassis so I have flexibility in that area. I will do some reading of the All Cees thread (and anything else I can find) so that I can gather my thoughts. I have to say that as a HiFi hobbyist, it's hard to resist the temptation of an approach that "improves the sound." Cheers. Dave M.
Hello Forum members,
I'm planning the power supply for my FH9HVX. I have decided to go dual mono for a number of reasons. I tried to find a data sheet for the transformers I'm looking at, but was unable to. Here are the vitals: Antek AS-2238. 200 VA toroidal transformer with dual secondaries rated at 38v and 2.8A.
Does that sound like a suitable trafo for this application? It does have the internal shielding as noted by the AS prefix.
My second question is: Do I need to make any changes to the All Cees BOM for dual mono (besides doubling the number of components). Thank you.
Dave M.
I'm planning the power supply for my FH9HVX. I have decided to go dual mono for a number of reasons. I tried to find a data sheet for the transformers I'm looking at, but was unable to. Here are the vitals: Antek AS-2238. 200 VA toroidal transformer with dual secondaries rated at 38v and 2.8A.
Does that sound like a suitable trafo for this application? It does have the internal shielding as noted by the AS prefix.
My second question is: Do I need to make any changes to the All Cees BOM for dual mono (besides doubling the number of components). Thank you.
Dave M.
Hi Dave,
That’s a good trafo for dual mono. There’s no changes to the BOM needed for a dual mono.
That’s a good trafo for dual mono. There’s no changes to the BOM needed for a dual mono.
Hey Forum members,
Don't know if anyone else ran into this but when I click on the link for the All Cees Digi Key shopping cart I get sent to an empty cart. Anyone have a saved copy they could forward to me? If not, it's not the end of the world I will choose my components individually. I was just hoping to save a step. Thanks folks.
Don't know if anyone else ran into this but when I click on the link for the All Cees Digi Key shopping cart I get sent to an empty cart. Anyone have a saved copy they could forward to me? If not, it's not the end of the world I will choose my components individually. I was just hoping to save a step. Thanks folks.
Hi UM,
Check out post #406 and #408 in the FH9HVX thread for a Mouser link. Create your own project rather than editing the original. I have also attached a file that includes an excel sheet of components for the All C's, the schematic, and a stuffing guide. Fairly complete except for the big electrolytic caps. Hope it helps a bit. Happy building.
Check out post #406 and #408 in the FH9HVX thread for a Mouser link. Create your own project rather than editing the original. I have also attached a file that includes an excel sheet of components for the All C's, the schematic, and a stuffing guide. Fairly complete except for the big electrolytic caps. Hope it helps a bit. Happy building.