Good information, thanks for the update!
ostripper, The reason why I originally went looking for kapton(and ended up with koptan) was due to a lack of availability in mica insulators for the TO-264 package. I`ll have to be extra cautious when installing
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Chassis size
I am trying to find out which size of the diyAudio Store Deluxe Chassis would fit my Honey Badger project. The pre-tapped holes, mounting plates, etc. really seem to make life a bit easier... !
I'll have a dual-mono power supply (single toroid with dual windings). Aiming for 45 to 50 VDC rail voltage. There will be a slow start and two DC protection units.
* Will the 4U / 300mm chassis be large enough?
* Is it correct the 400mm chassis is missing a hole in the center of the heatsinks?
I am trying to find out which size of the diyAudio Store Deluxe Chassis would fit my Honey Badger project. The pre-tapped holes, mounting plates, etc. really seem to make life a bit easier... !
I'll have a dual-mono power supply (single toroid with dual windings). Aiming for 45 to 50 VDC rail voltage. There will be a slow start and two DC protection units.
* Will the 4U / 300mm chassis be large enough?
* Is it correct the 400mm chassis is missing a hole in the center of the heatsinks?
I built my Honey Badger in the 4u chassis with dual power supplies with the chipamp.com Aleph power supply boards. They are a bit bigger than the DIY Audio Store boards. Might be a little tight with soft start and protection boards, but should fit.
The 5u / 400 mm chassis uses 2 pieces of heat sink per side. The joint is right where the center hole would be. It's way overkill for a badger anyway.
The 5u / 400 mm chassis uses 2 pieces of heat sink per side. The joint is right where the center hole would be. It's way overkill for a badger anyway.
I have the 5U deluxe chassis. I haven't completed my build yet, but the join does require a relocation of the center hole. I haven't decided how I will address this yet due to being busy with my house renovations. If I had my time back I probably would have went a bit smaller....but then circuit protection options are limited.
Ok, so the 4U / 300mm Deluxe chassis sounds like a good choice. Next question: the Sanken MT200 outputs won't fit the diyAudio USM drilling of the heatsinks, right?
If this is correct, I'd either (i) have to tap new holes or (ii) use different output devices. Option (i) defeats the hole idea of making life easy with the Deluxe chassis, so what about option (ii)? I am looking for compatibility with low impedance speakers (i.e., high current capability of the output stage). Which output devices would work well with respect to sound quality and SOA and still fit the USM scheme?
If this is correct, I'd either (i) have to tap new holes or (ii) use different output devices. Option (i) defeats the hole idea of making life easy with the Deluxe chassis, so what about option (ii)? I am looking for compatibility with low impedance speakers (i.e., high current capability of the output stage). Which output devices would work well with respect to sound quality and SOA and still fit the USM scheme?
Hi guys!
I am devestated here.
I have read that OS tested the MJL21193/MJL21194 and found them unworthy.
When I was ordering the parts, I wasn't aware of OS's comment, and just found it now.
I am really worried by my amp's sound quality now, so please tell me: Will it perform as good as many others, or will it have distorsion/phase problems I can hear?
Thanks In advance:
Sebastian
I am devestated here.
I have read that OS tested the MJL21193/MJL21194 and found them unworthy.
When I was ordering the parts, I wasn't aware of OS's comment, and just found it now.
I am really worried by my amp's sound quality now, so please tell me: Will it perform as good as many others, or will it have distorsion/phase problems I can hear?
Thanks In advance:
Sebastian
It should work, but you may have to adjust the compensation to account for the slightly slower transit times through the output devices.
I was the first to try the MJL21193/94. They lock up. It was determined that they are too slow for this EF3 OPS. Maybe you can find a solution. Andrewt seems to think you can.
Terry and Thimios got some cross-conduction, particularly while testing using square waves and high frequencies. I believe those devices could be just fine in an EF3 under 'normal' use but they sure don't like high speed testing.
An EF2, having less current gain, I believe is less problematic for the slower devices.
An EF2, having less current gain, I believe is less problematic for the slower devices.
As I do not understand what you guys are talking about, I guess I'll just have to stick with them.
Can anyone provide me any information about "compensating" the slowness?
Actually I'm planning to use it for my studio monitors (ATC's), so the less coloration is the best, and would love to hear your thoughts.
If the problem cannot be solved, I will try to replace them with other OP transistors, can you recommend me the best one for the badger?
Sadly, in my country, The NJW ones are not available.
Thanks in advance!
Can anyone provide me any information about "compensating" the slowness?
Actually I'm planning to use it for my studio monitors (ATC's), so the less coloration is the best, and would love to hear your thoughts.
If the problem cannot be solved, I will try to replace them with other OP transistors, can you recommend me the best one for the badger?
Sadly, in my country, The NJW ones are not available.
Thanks in advance!
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Sorry for the poor suggestion. I haven't tried them in the Badger. I have used the MJL21192/94 in some Apex EF2 amps without issue. They may work fine here. If you already have them I would try them. They are very robust. To make it a little easier to understand EF2 has drivers and outputs in the OPS. EF3 have pre-drivers, drivers and outputs. In the EF3 it was determined that the MJL21193/94 don't quite turn off all the way before the complimentary turns on so they lock up.
If you need other outputs, the ones that Bob Ellis suggested may be the best for this amp.
If you need other outputs, the ones that Bob Ellis suggested may be the best for this amp.
I asked before and got no explanation, so I'll ask again.
What is "lock up"?
I don't see the Zobel you refer to.
I do see a damped inductor in the base feed in lieu of base stoppers.
This might have the effect of slowing down the output's response sufficiently to compensate the feedback loop.
I also see very heavy loading of the previous stage (R108, R109 & C77) This will also apply HF compensation.
I do see a damped inductor in the base feed in lieu of base stoppers.
This might have the effect of slowing down the output's response sufficiently to compensate the feedback loop.
I also see very heavy loading of the previous stage (R108, R109 & C77) This will also apply HF compensation.