with the primaries properly wired up for the voltage supply you have the transformer is a 550VA.
If you wire the two 100Vac primaries in series and connect them to a 115Vac supply you reduce the transformer to ~300VA.
DON'T.
Fair point. I was applying Nelson's advice to get the right voltage without thinking about the power capacity of the primary windings. I guess I could use it that way with fewer transistors per side...maybe three or four?
Perhaps an alternative would be to series regulate it down to the required voltage? It would require a pretty hefty series transistor, I guess.
Can I raise the power supply voltage of BA-1?
I'm going to keep my BA-3 with its own power supply, so I'm only concerned about power to the output stage and bias boards.
I want to use my 27+27V transformer, which yields about 38V DC.
It seems that the extra voltage would not burn the power transistors, but I'm not so sure about the bias boards.
Any thoughts?
I'm going to keep my BA-3 with its own power supply, so I'm only concerned about power to the output stage and bias boards.
I want to use my 27+27V transformer, which yields about 38V DC.
It seems that the extra voltage would not burn the power transistors, but I'm not so sure about the bias boards.
Any thoughts?
The output stage of BA1 works in pure single-ended.
With 0.58 A per MOSFET (6), the BA1 provides, with ± 32V, 50 watts into 8 ohms, 25 watts into 4 ohms but only 12 of 2 ohms, ...
Is there a "small" circuit that could push the output stage in class AB (in the style of the Aleph 0, 0s and 1), for at least 50 watts into 4 ohms and 2.
Regards
Darry
With 0.58 A per MOSFET (6), the BA1 provides, with ± 32V, 50 watts into 8 ohms, 25 watts into 4 ohms but only 12 of 2 ohms, ...
Is there a "small" circuit that could push the output stage in class AB (in the style of the Aleph 0, 0s and 1), for at least 50 watts into 4 ohms and 2.
Regards
Darry
Hi Zen,
I am building a BA 1 I have the front end together and tested out ok,now I am confused at how to WIRE the output I got 2 identical boards for ba 1 output stage ,I don't know how to wire them up ,the diagram has 12 fets post#4 my boards have places for 6 so 1 board is N and the other is P correct so far ?can the outs from both boards be connected ? the way it looks they are jumper-ed over in the diagram ,maybe that's where I'm confused.
I would like a diagram or drawing of how to connect/wire them together,I am trying not to live up to my nick,lol Cheers!
Thanks,
No Smoking( a joke on burning up perfectly good parts.)
I am building a BA 1 I have the front end together and tested out ok,now I am confused at how to WIRE the output I got 2 identical boards for ba 1 output stage ,I don't know how to wire them up ,the diagram has 12 fets post#4 my boards have places for 6 so 1 board is N and the other is P correct so far ?can the outs from both boards be connected ? the way it looks they are jumper-ed over in the diagram ,maybe that's where I'm confused.
I would like a diagram or drawing of how to connect/wire them together,I am trying not to live up to my nick,lol Cheers!
Thanks,
No Smoking( a joke on burning up perfectly good parts.)
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no no
its true for Nelson's original 'idea', and schematic
I reckon he had some very huge heatsink cooling in mind😀
meaning, any big ordinary stereo box with big double heatsinks could be used for a mono amp
but forum version in the store are designed differently
1 output board holds both N and P devices for a mono amp
a very practical solution for bridged setup where you need a complete stereo amp
looking at my own BA2 output boards from the store, outputs are clearly marked with either 'N' or 'P'
Hi T,
So how is the store boards populated with the fets?they are all 240's right?🙂🙂
I will check that out and see if that's where I went astray,thanks!
So how is the store boards populated with the fets?they are all 240's right?🙂🙂
I will check that out and see if that's where I went astray,thanks!
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UPS !
BA1 have 'N' outputs only 😕
or else I guess you would have BA2 boards 😕
nosmoking, quit smoking, you are confusing me 😀
Hi Tinitus,
All N boards but that should be right if it uses all 240's ,I will put one in place and wire it up and see how it does,LOL.
All N boards but that should be right if it uses all 240's ,I will put one in place and wire it up and see how it does,LOL.
that would be BA1 boards
seems like it could also be used for BA3, if you want a SE BA3
each board designed/wired to build a mono amp, one output board for 1 mono amp
Hi Tinitus,
I went back and read the whole thread ,you were right Ba1 boards all 240's with N on them and the BA 2 boards with alternating locations for N and P ,I fired it up and all is swell so far,lol. Thanks for the help!!!!!!!! no smoking today,LOL.
I went back and read the whole thread ,you were right Ba1 boards all 240's with N on them and the BA 2 boards with alternating locations for N and P ,I fired it up and all is swell so far,lol. Thanks for the help!!!!!!!! no smoking today,LOL.
hey, that is😎 thanks Nelson
me like to hardwire that one 🙄
man you are fast 😱
We really should all make a Burning Amp with both kinds of output stages. Then we'd know what we're talking about vis a vis single ended vs. complementary sounds-wise.
kinda.....
kinda.....
Hi Variac,
I will order the boards for a BA 2 output stages soon so I can hear both worlds and see! Thanks for your input,
I hope to make BA this year ,I hope to stay a few days and see the city!
I will order the boards for a BA 2 output stages soon so I can hear both worlds and see! Thanks for your input,
I hope to make BA this year ,I hope to stay a few days and see the city!
Great that you're coming.
And that wasn't a sales pitch- I had forgotten just how cool the Burning Amp family is.
Mark
And that wasn't a sales pitch- I had forgotten just how cool the Burning Amp family is.
Mark
1ohm 3w resistors in ba-1
Hello everyone,
Just a quick question about the 1ohm 3w resistors in ba-1 (for with use with ba-3b)
Can I use wirewound resistors
Do they have to be matched
Your advise is very much appreciated
Hello everyone,
Just a quick question about the 1ohm 3w resistors in ba-1 (for with use with ba-3b)
Can I use wirewound resistors
Do they have to be matched
Your advise is very much appreciated
yes , you can
match them if you can
one of possibility is with small precise CCS (5-10mA , small Jfet or anything what you already have in drawer) measuring voltage across resistor; then all you need is to compare voltage readings
match them if you can
one of possibility is with small precise CCS (5-10mA , small Jfet or anything what you already have in drawer) measuring voltage across resistor; then all you need is to compare voltage readings
mathing resistors amp layout etc
Thanks,
How precise does matching have to be done? Would within 2 percent be sufficient?
Heres's another question
the idea is to build balanced version of ba3 to serve as frontend with powerstage of ba1 (thats the single ended version).
I will build two mono chassis. Each chassis has heatsinks on left and right side.
Am I correct saying that al upper side mosfets (from in fact two ba-1 powerstages) go together on one heatsink and al downside mosfets go together on the other heatsink?
Your advice is again much appriciated
Thanks,
How precise does matching have to be done? Would within 2 percent be sufficient?
Heres's another question
the idea is to build balanced version of ba3 to serve as frontend with powerstage of ba1 (thats the single ended version).
I will build two mono chassis. Each chassis has heatsinks on left and right side.
Am I correct saying that al upper side mosfets (from in fact two ba-1 powerstages) go together on one heatsink and al downside mosfets go together on the other heatsink?
Your advice is again much appriciated
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let's just say thjat you'll have them matched more tightly , if you buy 50% more than you need
regarding heatsinking/grouping - make them in a way which leads to tidier wiring
regarding heatsinking/grouping - make them in a way which leads to tidier wiring