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Old 30th January 2013, 09:35 AM   #211
AndrewT is offline AndrewT  Scotland
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Great headline specification, pretty terrible performance when one cares to look at the details.
eg 2n3773 has a guaranteed 1A @ 100Vce.
This 250W device is ~ 500mA @ 100Vce.
Gain droop at >2A abominable !
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Old 30th January 2013, 11:23 AM   #212
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Quote:
Originally Posted by AndrewT View Post
Great headline specification, pretty terrible performance when one cares to look at the details.
eg 2n3773 has a guaranteed 1A @ 100Vce.
This 250W device is ~ 500mA @ 100Vce.
Gain droop at >2A abominable !
Thanks. I was afraid of that HFE droop. SO, what outputs would you recommend for Bass-Badger subwoofer amplifier?
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Old 30th January 2013, 11:38 AM   #213
AJT is offline AJT  Philippines
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i have those mjw18020 and i use them for ATX psu's....
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Old 30th January 2013, 11:39 AM   #214
AJT is offline AJT  Philippines
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Originally Posted by danielwritesbac View Post
Thanks. I was afraid of that HFE droop. SO, what outputs would you recommend for Bass-Badger subwoofer amplifier?
mj21193/21194....
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Old 3rd February 2013, 09:48 PM   #215
ncg2013 is offline ncg2013  United Kingdom
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Default Alternative Honey Badger DIY Chassis

Although I really like the HIFI2000 Chassis I fancy something a little different, and cheaper. I found a design which seems simple to put together and fairly cheap. See design here. But what I was wondering was if I put the heatsinks on the inside, and drill approriate vents will it be enough to cool the Honeybadger, with a 45+45Vac? The heatsinks I had in mind were these, With a length of 100mm.

I will adjust the size of the chassis seen in the link to the same as the "Jack of all Chassis" size.

Also anyone else copied this design?
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Old 4th February 2013, 01:22 PM   #216
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For that shorter height enclosure I'd be looking for heatsinks with BIG fins like these:
Heatsinks: Search results
9540HS Width:750.00mm x Height: 83.50mm
9740HS Width:600.00mm x Height: 85.00mm
9530HS Width:600.00mm x Height: 83.50mm
9730HS Width:500.00mm x Height: 85.00mm
9520HS Width:500.00mm x Height: 83.50mm
9720HS Width:400.00mm x Height: 85.00mm
9630HS Width:400.00mm x Height: 84.00mm
9510HS Width:400.00mm x Height: 83.50mm
1633HS Width:300.00mm x Height: 84.00mm
9710HS Width:300.00mm x Height: 84.00mm
9620HS Width:300.00mm x Height: 84.00mm
9500HS Width:300.00mm x Height: 83.50mm
1630HS Width:300.00mm x Height: 83.00mm
. . . and some creative ventilation.
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Old 4th February 2013, 08:43 PM   #217
ncg2013 is offline ncg2013  United Kingdom
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The height of the enclosure was going to be 150mm so not much shorter than the big chassis at 210mm. Maybe bigger heatsinks and lots of holes will do the trick or maybe a fan, but was wondering whether this can add noise of some sort, interference?
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Old 7th February 2013, 12:33 AM   #218
Juvenal is offline Juvenal  United States
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Default 45vac with 4ohm load

Hello,

I am gathering supplies to build this amp, and am now looking at the power supply portion.

The build guide recommends the AN-8445 transformer, which is 45-0-45, but earlier in this thread it states 45vac is not suitable for 4ohm loads.

If this is true, i would likely go with a 35+35vac transformer, in order to suite my 4ohm load.

possibly the AN-8435, this is going to be a dual monoblock, so that would give plenty of overhead in the transformer department (also as a bonus thats one of the transformers they will be producing first after antek's fire).

Next would be caps for the psu. The build guide recommends 4x 10,000uf caps for each rail. I have yet to find 30mm diameter 10k uf caps anywhere.

Since this is a dual monoblock, could I get away with less capacitance on each rail?

4x 4.7k uf caps on each rail would be acceptable? but give less protection against fluctuation on the mains?

Thanks in advance,
Juvenal
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Old 7th February 2013, 10:53 PM   #219
ncg2013 is offline ncg2013  United Kingdom
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Default My Mouser BOM...

Hi Everyone, I have eventually managed to complete (more or less) a Mouser BOM. Any suggestions, alternatives, sharp intakes of breath welcome. I have tried to follow suggestions for alternative components and have tended towards higher voltage/tolerances where cost allows. No idea what the total of this lot is.

I would like to know if I am going in the right direction.

Published on google docs, hopefully this will work. CLICK HERE
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Old 8th February 2013, 12:30 PM   #220
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Default Re : My Mouser BOM

0) I am assuming you are using the PCB supplied by the store. Otherwise, ignore all of my comment.
1) For D3, I had trouble fitting 1W diode through the PCB hole. I ended up with using resistor approach.
2) For 0.22R resistor, it is not the same package type as build guide shows. It will work if you don't mind unstable resistor mounting. I did the same thing as you, later on, switch all 12 to the smaller kind.
3) Those 220uF and 470uF Nichicon KW series capacitors are audio grade. You may or may not need 0.1uF capacitor. Also check whether the hole is large enough for those audio grade cap. Their leg maybe very thick in diameter. If I were you and prefer Nichicon, I will also purchase inexpensive Nichicon VR as a back up. They will fit although only for general purpose.
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