The creepage thing is why I opted to lay out the NS inputs that way they are. PD+, NFB and ND- are all in one plug with only a few volts difference between pins. I put the power connector between the input and VAS. The power connector pins are maximum 60VDC difference between pins with our external regulators. Worked out very well!
BOM ... finally.
A stupid (me) hard shutdown of my Xeon to put in gold/silver SATA HDD cables wiped
half my BOM out a few days ago.
Now it's finished.
Last two entries are interesting.
I never looked up the most expensive of the output device choices.
WOW !!! The ON semi MJL4281A/4302A pair are "beasts".
350Vceo devices @ 4A DC and 6+A 100m/sec SOA.
Similar to Sanken 230W MT-200's.
These devices could match the 5mm rail trace Imax.
Even as these devices are 7USD each , Mouser will have 1000 of each
tomorrow.
12/15A fuses for the rails and you have a 400W Wolverine.
On my 3 pair Sanken unit , I could light up toaster Nichome wire and
drive a paralleled 4R DVC 500W car sub to Xmax.The amp would just
get moderately warm with 55V rails.
The MJL4281A/4302A pair does have a higher Cob @ 600pF. R111
would definitely be 82R - 100R and C112 , "up it" to 1uF (suckout cap).
But in the end a "beast you would have".
I actually TRIED to blow up a Sanken slew.
Nearly impossible. Screw up , pop in a fuse ... continue.
Also calculated the 1mm/1.26mm(18/16ga) L1 winding.
The BOM is quite specific. A "beast" would require option 2.
OS
A stupid (me) hard shutdown of my Xeon to put in gold/silver SATA HDD cables wiped
half my BOM out a few days ago.
Now it's finished.
Last two entries are interesting.
I never looked up the most expensive of the output device choices.
WOW !!! The ON semi MJL4281A/4302A pair are "beasts".
350Vceo devices @ 4A DC and 6+A 100m/sec SOA.
Similar to Sanken 230W MT-200's.
These devices could match the 5mm rail trace Imax.
Even as these devices are 7USD each , Mouser will have 1000 of each
tomorrow.
12/15A fuses for the rails and you have a 400W Wolverine.
On my 3 pair Sanken unit , I could light up toaster Nichome wire and
drive a paralleled 4R DVC 500W car sub to Xmax.The amp would just
get moderately warm with 55V rails.
The MJL4281A/4302A pair does have a higher Cob @ 600pF. R111
would definitely be 82R - 100R and C112 , "up it" to 1uF (suckout cap).
But in the end a "beast you would have".
I actually TRIED to blow up a Sanken slew.
Nearly impossible. Screw up , pop in a fuse ... continue.
Also calculated the 1mm/1.26mm(18/16ga) L1 winding.
The BOM is quite specific. A "beast" would require option 2.
OS
Yes , good choice. they are also in phase (not perfect , but close).
Stuart needs to bring PD+/ND- closer to G2. Why ... at idle , PD+/ND-
sit a roughly +2V/-1.8V. At full power each can swing rail to rail -5V.
So you could have a 115V potential between PD+ and V+. A G2/PD+
potential could only be 55V. Better.
OS
I put a set in my honey badger about 1.5 months agoI have 6 pairs of MJL4xxx set aside for this.
I thought they were discontinued?
I have 6 pairs of MJL4xxx set aside for this
I thought they were discontinued?
No , Mouser is going to get 1K of the PNP's tomorrow.
Neither gender says obsolete. I was viewing the MJL4302/4281AG version.
Just the 4302 have a 4/21 delivery date
PS - The 4302/4281 A's are obsolete.
OS
I have 6 pairs of MJL4xxx set aside for this
I thought they were discontinued?
On Semi has been scaring a lot of people for years by adding a G to the end of the part number to indicate lead free, then marking the previous version obsolete. I think these will be around for a while.
Nice Badger! Thank's for the info guys! I Remember the sankens being discontinued, and then I got the MJL EOL notice from mouser. I was starting to worry about outputs!
I believe Pete reduced the worry a lot with this modular design! I'll have to order extra though, I'd like to do a second system for the shop eventually.
I believe Pete reduced the worry a lot with this modular design! I'll have to order extra though, I'd like to do a second system for the shop eventually.
I am getting Sanken 2sa2223AY and 2sc6145AY from profusionplc hfe ~100. I think they are a good option too.
Hi OS,
I was talking to Harry and he suggested maybe we can use a larger pitch plug to solve the creepage problem on the pads of the DIP
Maybe a 4.2mm pitch could work.
You may also be able to use a 6 position like this.
I'm sure the Badger had borderline creepage issues. It's good that 3 layout
people are swapping designs.
Creepage with this one is more important. Slew/Wolverine is a 50-85 ! volt
design. Badger was strait 60V.
I don't remember this much fussing over the Badger layout - but we know
more and this is good !!
Some may be scared of a 85V rated amp. Yamaha did it. I repaired a 2 pair per
channel natural sound amp. It had 82V rails/10Kuf per channel PS .. and
a trafo that was slightly under-rated for 2 amps like this.
This amp could belt out a transient of 5db over rated power. I sure it could not
"hold" a 150V p-p signal , the PS would "fold" under that load.
Basically , the amp could throw out 400w peaks while rated at 135W RMS.
Wolverine has the Cap multipliers ... wildly fluctuating PS's are no issue here.
PS - that Yamaha was a "scary" amp to listen to at high levels !!!!
OS
people are swapping designs.
Creepage with this one is more important. Slew/Wolverine is a 50-85 ! volt
design. Badger was strait 60V.
I don't remember this much fussing over the Badger layout - but we know
more and this is good !!
Some may be scared of a 85V rated amp. Yamaha did it. I repaired a 2 pair per
channel natural sound amp. It had 82V rails/10Kuf per channel PS .. and
a trafo that was slightly under-rated for 2 amps like this.
This amp could belt out a transient of 5db over rated power. I sure it could not
"hold" a 150V p-p signal , the PS would "fold" under that load.
Basically , the amp could throw out 400w peaks while rated at 135W RMS.
Wolverine has the Cap multipliers ... wildly fluctuating PS's are no issue here.
PS - that Yamaha was a "scary" amp to listen to at high levels !!!!
OS
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sure OS the file that stuart post here #576
I just did the 12 pin thing I was doing the components ID I haven't finish yet, also because ST is working on it I really don't want to mess this up too since all macros are made already as components they can have ID and value and that generate a BOM exporting to text easily I did the same with the Greenamp The Green Arrow version you did last year the schematic "I don't remember" lol
yes the Greenamp PCB V1.2 I tested and sounds really good just that I don't have proper tools to give and inform accurate results
I'm gonna attached here as example
I just did the 12 pin thing I was doing the components ID I haven't finish yet, also because ST is working on it I really don't want to mess this up too
since all macros are made already as components they can have ID and value and that generate a BOM exporting to text easily I did the same with the Greenamp The Green Arrow version you did last year the schematic "I don't remember" lol yes the Greenamp PCB V1.2 I tested and sounds really good just that I don't have proper tools to give and inform accurate results
I'm gonna attached here as example
Attachments
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