Capacities that are too large are not good. Switching noise, losses, transformer hum, blown fuses, material stress.
Hi. I am new to this and have a couple of questions before I try this out if anyone could please help me?
What does the extra output stage of the EF3-4 get you? More power? Better sound?
What’s the difference between the MBB and CMF completed PCB?
Does anybody have a rough estimate for the parts cost for all of the BOM for the boards?
I see you can order 2 pairs of boards, is that only for 2 separate amps or can you use 2 sets in one amp? Do you need 2 sets for dual mono?
Thanks for the help.
What does the extra output stage of the EF3-4 get you? More power? Better sound?
What’s the difference between the MBB and CMF completed PCB?
Does anybody have a rough estimate for the parts cost for all of the BOM for the boards?
I see you can order 2 pairs of boards, is that only for 2 separate amps or can you use 2 sets in one amp? Do you need 2 sets for dual mono?
Thanks for the help.
Each board set is one channel. Mix them however you want with your power supplies and chassis. Dual mono implies separate supplies for each channel,
The additional output transistors increase current capability and thus increase power output. This design runs currents in the output transistors at very modest values compared to the transistor ratings. This helps avoid certain types of distortion from the output stage and also ensures that the transistors are well within their SOA (safe operating area).
The parts for each board set run $180 to $250, not including the boards. It could be a bit less with standard resistors rather than the CMF series. Properties that vary from the CMF to other types are things like temperature coefficient, flammability, and stability. It will make little difference in the finished system - down in the sub-part per million distortion most likely. However, some standard resistors are larger than the lead spacing for a couple of sites on the board. I made it work on my first board before I had all of the BOM parts in hand. Works fine and is better than my test equipment.
PM me if you are interested in a parts kit for the board components.
The additional output transistors increase current capability and thus increase power output. This design runs currents in the output transistors at very modest values compared to the transistor ratings. This helps avoid certain types of distortion from the output stage and also ensures that the transistors are well within their SOA (safe operating area).
The parts for each board set run $180 to $250, not including the boards. It could be a bit less with standard resistors rather than the CMF series. Properties that vary from the CMF to other types are things like temperature coefficient, flammability, and stability. It will make little difference in the finished system - down in the sub-part per million distortion most likely. However, some standard resistors are larger than the lead spacing for a couple of sites on the board. I made it work on my first board before I had all of the BOM parts in hand. Works fine and is better than my test equipment.
PM me if you are interested in a parts kit for the board components.
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No, the whole arrangement of the vbe multiplier and the temperature compensation was completely reworked. Details are in this thread and the updated Schematic and Bom. We have been updating the build guide and a revision should be available in the next few days.
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https://www.diyaudio.com/community/...he-wolverine-build-thread.385920/post-7360185
Maybe you missed this post, details there. 👍
So in the interest of being frugal, as one has to be all the way down here, I've found a doner amplifier chassis. Getting heatsinks drilled and tapped is no issue.
The corpse is a Parasound HCA-1206 with PSU caps that had gone up in smoke and made a meal of the PCB too, thanks to the main caps being under spec'd from the factory. Whilst pulling it apart to begin inspecting the case I noticed its chock full of Sanken 2SC3263 and 2SA1294's, which are also on the wolverine output list. Could these be reused at all in my 3 pair, with proper testing? You'll have to sympathize with me wanting to be cheap, but shipping here is spenny and funds have really tightened up. On the other hand, I fully understand if you want to tell me no, the wolverine is deserving of only the highest quality new parts you Scrooge.
My power supply is going to be the (unregulated) hypex smps1200a400 65VDC as I already have one of those here.
The corpse is a Parasound HCA-1206 with PSU caps that had gone up in smoke and made a meal of the PCB too, thanks to the main caps being under spec'd from the factory. Whilst pulling it apart to begin inspecting the case I noticed its chock full of Sanken 2SC3263 and 2SA1294's, which are also on the wolverine output list. Could these be reused at all in my 3 pair, with proper testing? You'll have to sympathize with me wanting to be cheap, but shipping here is spenny and funds have really tightened up. On the other hand, I fully understand if you want to tell me no, the wolverine is deserving of only the highest quality new parts you Scrooge.
My power supply is going to be the (unregulated) hypex smps1200a400 65VDC as I already have one of those here.
I would say reuse them, after testing. They are great outputs!
