Can the two people that have left to pay please pay up so we can get this show on the road before the new forum freezes everything.
Halo6, In the last two group buys I ran some of the folks on the wiki never responded again. We will just have to wait and see. I do not expect Rhysh to fork out his money for my boards.
It would be nice for those individuals to pay up or correspond.
Tad
It would be nice for those individuals to pay up or correspond.
Tad
tryonziess said:
This is normally the case, there is allways the people that dont respond. I will start sending out e-mails tomrrow, to be fair some people did not actually post in the thread, so they may not be aware of any updates.
I have dropped the other two from the group buy. Boards are going to be paid for tonight. Boards will be shipped to you in about 3 / 4 weeks.
Anyone wanting some sort of kit let me know.
Anyone wanting some sort of kit let me know.
rhysh said:
Are you preparing complete kits with all necessary components? Buying each component in RS or Farnell is a problem, they obligate me to buy packs of 10 or even 100 units, and after several projects my house looks like an electronics store.
If you are preparing complete kits I'm interested in this.
Thanks
I am interested in what a Premium BOM and a Standard BOM is. If it is beenficial for everyone I would do a kit and have you do SMD soldering like I think you stated earlier in a post. I am interested in a Premium BOM though! and I olny need it for 4 of the boards. (2 extra are in case I tank someonthing 🙂 )
I have allready said i would be happy to prepare kits, this means people only pay shipping once.
The BOM i will produce will be 'premium', the only premium parts you can use on the BPA300 are the capacitors. I will be using premium capacitors that dont cost the earth.
I would prefer not to do 2 BOM's, as this is more expensive and i wont be able to hit the price breaks.
The BOM i will produce will be 'premium', the only premium parts you can use on the BPA300 are the capacitors. I will be using premium capacitors that dont cost the earth.
I would prefer not to do 2 BOM's, as this is more expensive and i wont be able to hit the price breaks.
Are the boards on order yet?
Just asking since the wiki still says the group buy is open.
Really looking forward to this project.
Just asking since the wiki still says the group buy is open.
Really looking forward to this project.
Hi, been busy over the last couple of days, need to edit out the wiki etc. Yes, the boards are on order.
Halo,
A 1kVA transformer will give you more inrush current than 2x 500VA when you turn your amp on
If no fuses are used then this can damage your amps.
You'll have to think about a soft-start circuit or thermistors.
In my opinion you should have it anyway even with 2x 500VA trafo's
but to answer your question: yes 1kVA in total should be alright
regards
A 1kVA transformer will give you more inrush current than 2x 500VA when you turn your amp on
If no fuses are used then this can damage your amps.You'll have to think about a soft-start circuit or thermistors.
In my opinion you should have it anyway even with 2x 500VA trafo's
but to answer your question: yes 1kVA in total should be alright
regards
so two 500VA with 25 volt secondaries making one transformer for each channel...
Is there a such thing as 1000Va with 4 x 25 volt secondaries? Is that equvalent to having a pair of 500Va?
It seems I will be paying alot more for 2 500V than for 1 1000V trafo... would there be a benifit to having separate trafos for each channel
I am new at this please educate me if I am travelling down the wrong path...
I figure I would do a soft start anyway for either of the two trafo designs.
Is there a such thing as 1000Va with 4 x 25 volt secondaries? Is that equvalent to having a pair of 500Va?
It seems I will be paying alot more for 2 500V than for 1 1000V trafo... would there be a benifit to having separate trafos for each channel
I am new at this please educate me if I am travelling down the wrong path...
I figure I would do a soft start anyway for either of the two trafo designs.
1000VA 4X25V TOROIDAL
http://www.antekinc.com/
http://www.antekinc.com/AN-10425.pdf
last week i bought a 600 VA 2x18V from Antek, very good, very quick and good price.
See my layout of BPA 300 with this 1000VA toroidal here:
http://ignatiusprojects.blogspot.com/
The rear part has two levels, bottom level for slow blow circuit and drv134 power supply and second level for switch, pot and drv134 boards.
http://www.antekinc.com/
http://www.antekinc.com/AN-10425.pdf
last week i bought a 600 VA 2x18V from Antek, very good, very quick and good price.
See my layout of BPA 300 with this 1000VA toroidal here:
http://ignatiusprojects.blogspot.com/
The rear part has two levels, bottom level for slow blow circuit and drv134 power supply and second level for switch, pot and drv134 boards.
in theory you can get a 4x25v trafo made but i think it'd be expensive
I guess the benefits of a dual mono design is better channel separation
I guess the benefits of a dual mono design is better channel separation
Awesome thanks for the replies, i am on the short bus when it comes to this... hopefully I will learn alot about DIY audio with this build as i have already caught the bug, just dont have the technical knowledge to back it up!
Hi Halo,
how much experience do you have working with toroid transformers?
If you are competent, you can convert a 0-50 + 0-50Vac to four separate 25Vac windings.
It's just a case of finding the midpoint in each of the two windings and cutting to insert four extra (flexible) output leads. Then re-insulate the secondary.
4 isolated secondaries is almost as good as two transformers each with dual secondaries. If the 1000VA has a better regulation than the 500VA then the single big transformer can help the system to perform better.
how much experience do you have working with toroid transformers?
If you are competent, you can convert a 0-50 + 0-50Vac to four separate 25Vac windings.
It's just a case of finding the midpoint in each of the two windings and cutting to insert four extra (flexible) output leads. Then re-insulate the secondary.
4 isolated secondaries is almost as good as two transformers each with dual secondaries. If the 1000VA has a better regulation than the 500VA then the single big transformer can help the system to perform better.
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