Understood perfectly, Cost goes up exponentially with increasing voltage on power amps, just like everything else boats, houses, etc. For some reason I thought the cascode (sic totem pole) outputs could be done away with higher voltage devices.
Maybe i'll look at other solutions and unparallel my woofers for an option on bridge solutions. $45/90 + shp for regular Leach bare pcb/s is a little rich for me at the moment. Think I may follow my original advice, now that my DIY project plate is full right now.
Thanks for your patience and look forward to your progress on this super Leach endeavor.
Maybe i'll look at other solutions and unparallel my woofers for an option on bridge solutions. $45/90 + shp for regular Leach bare pcb/s is a little rich for me at the moment. Think I may follow my original advice, now that my DIY project plate is full right now.
Thanks for your patience and look forward to your progress on this super Leach endeavor.
infinia said:
No, the casocdes cut the voltage across each device in half. In theory, you only need 100V parts, but we like a reserve. The Dynaco 400 used 100V parts, for instance. The original super Leach used 150V parts, and they were loafing. You could save a bit on outputs, but the power supply and all is expensive.
To save cost, just use the original leach board, with discrete wiring and added parallel devices. It would be a lot of hand wiring, but work OK. Check out this website for some examples of handwiring outputs.
http://www.ampslab.com/bi240.htm
Super Leach BOM with Costs spreadsheet
I put together a Bill of Materials for the Leach Super Amp, in spreadsheet form, with pro forma costs. You can insert your own costs and crank the numbers as you choose. Looking at this spreadsheet gives some insight into where the costs are in the amp.
Total cost is not very sensitive to the cost of the 16 output transistors. As expected, what I call infrastructure (case, power transformer, caps and so on) is fairly high. You will want to insert your own design for infrastructure, as we all have our preferences.
The costs are reasonable estimates for now and I will make them more accurate later, but they help me see where the costs in the system lie. Feel free to use, modify, and otherwise play with this tool. Hope it helps people understand this beast a little better.
I put together a Bill of Materials for the Leach Super Amp, in spreadsheet form, with pro forma costs. You can insert your own costs and crank the numbers as you choose. Looking at this spreadsheet gives some insight into where the costs are in the amp.
Total cost is not very sensitive to the cost of the 16 output transistors. As expected, what I call infrastructure (case, power transformer, caps and so on) is fairly high. You will want to insert your own design for infrastructure, as we all have our preferences.
The costs are reasonable estimates for now and I will make them more accurate later, but they help me see where the costs in the system lie. Feel free to use, modify, and otherwise play with this tool. Hope it helps people understand this beast a little better.
infinia said:
Please note that the US$45/board is a small volumen price. I can not justify to buy 100+ boards at a time to get the price down. I sell the boards at the price I pay myself and thus earn absolutly nothing on the PCBs......
I do this for fun and to help the DIYers that contact me regarding boards!
\Jens
I would like to buy two boards
Hi
Im interested in two boards for a stereo-amp. Where to buy those boards (from you Jens)? Could I pay by PayPal?
Thanks in advance
Regards 😎
Hi
Im interested in two boards for a stereo-amp. Where to buy those boards (from you Jens)? Could I pay by PayPal?
Thanks in advance
Regards 😎
jens,
are you saying you have the super leach amp bards, the 16 transistors output and that you are selling them for U$45 per board? just want to be clear on this. thanks
are you saying you have the super leach amp bards, the 16 transistors output and that you are selling them for U$45 per board? just want to be clear on this. thanks
No, that is not was I am saying!
I was talking about the extended (10 transistor) Leach Clone.
\Jens
I was talking about the extended (10 transistor) Leach Clone.
\Jens
Hi Jens,
May I ask where we are with this project now? I've kind of lost track. Is someone going ahead with a GB for boards or are we still in design stage? The 6 device boards you designed are really nice. I still am very interested is getting my hands on a pair of the Superamp boards designed by you. I know they will work well.
Thanks so much for all you do for the community here.
Blessings, Terry
May I ask where we are with this project now? I've kind of lost track. Is someone going ahead with a GB for boards or are we still in design stage? The 6 device boards you designed are really nice. I still am very interested is getting my hands on a pair of the Superamp boards designed by you. I know they will work well.
Thanks so much for all you do for the community here.
Blessings, Terry
Terry,
Thanks for you kindness... I'm not 100% happy with the board the way it is now. I might have to throw everything up in the air and try all over to get a better result.
I have a completed layout (all connections are made) but I feel that there is room for improvements so I would rather wait with releasing the layout until I'm happy with it.
I hope you can understand - I'd hate to release a design that has errors in it.
\Jens
Thanks for you kindness... I'm not 100% happy with the board the way it is now. I might have to throw everything up in the air and try all over to get a better result.
I have a completed layout (all connections are made) but I feel that there is room for improvements so I would rather wait with releasing the layout until I'm happy with it.
I hope you can understand - I'd hate to release a design that has errors in it.
\Jens
Jens, don't hesitate to add your "thing" into the design if you see some obvious things. Nothing says that "Leach original" can't be improved.
Hi Jens,
Thanks for clearing things up. I don't want you to hurry. I would rather you are satisfied with the design before you release it. It's not like I really NEED another amp, I've just always wanted to build a working Superamp and I have a transformer set aside for it, so when you get it finished I will be waiting. 🙂
Blessings, Terry
Thanks for clearing things up. I don't want you to hurry. I would rather you are satisfied with the design before you release it. It's not like I really NEED another amp, I've just always wanted to build a working Superamp and I have a transformer set aside for it, so when you get it finished I will be waiting. 🙂
Blessings, Terry
Jens:
If you should re-design the boards, maybe I could remind you to my thoughts a couple of sides back in this thread (if you dont mind?)
flodstroem:
Earlier I said I wanted two boards but I got new ideas: bridging/strapping and because of that I will be in the need of 4 boards for a stereo pair.
Looking forward to see your finished design Jens.
Regards 😎
If you should re-design the boards, maybe I could remind you to my thoughts a couple of sides back in this thread (if you dont mind?)
flodstroem:
Earlier I said I wanted two boards but I got new ideas: bridging/strapping and because of that I will be in the need of 4 boards for a stereo pair.
Looking forward to see your finished design Jens.
Regards 😎
Goodmorning!!😱
I'm planning to build the LeachAmp clone that Jens had made.
I really like the PCB and the professional job that he did for the forum!!
Since i don't have speakers now, the system is under constraction (The preamp is ready) i was wondering the quality of the LeachAmp.
It's 2x180W / 8 Ohm, That the power output for me but is it a really Hi-End design?
Thanks a lot!
I'm planning to build the LeachAmp clone that Jens had made.
I really like the PCB and the professional job that he did for the forum!!
Since i don't have speakers now, the system is under constraction (The preamp is ready) i was wondering the quality of the LeachAmp.
It's 2x180W / 8 Ohm, That the power output for me but is it a really Hi-End design?
Thanks a lot!
Hi All,
I have decided to close this project due to possible copyright infringements issues pointed out in an other Leach Super Amp thread.
This means that I will publish no layout for this amp and I will remove the Leach amp PCB production files + PDFs from my website in the near future.
Please excuse me for wasting your precious time – Moderators please terminate this thread – thank you.
Please don't contact me for boards or data - none will be provided - thank you.
\Jens
I have decided to close this project due to possible copyright infringements issues pointed out in an other Leach Super Amp thread.
This means that I will publish no layout for this amp and I will remove the Leach amp PCB production files + PDFs from my website in the near future.
Please excuse me for wasting your precious time – Moderators please terminate this thread – thank you.
Please don't contact me for boards or data - none will be provided - thank you.
\Jens
Jens,
While I admire your concern for other's intellectual property rights, there is no issue at least with US law.
Copyright protects the EXPRESSION of an idea, not the idea itself. Thus we can have many versions of the girl falls in love with a boy from the wrong side of the tracks story (Romeo and Juliet, West Side Story and Grease, for example) without copyright infringement.
As long as you do not publish Leach's articles as your own, you are not infringing. In all of your versions of the Leach amp there have been a number of changes, from the number of output devices, to the choice of devices. These changes, along with layout changes clearly take it out of the realm of copyright infringement.
I haven't looked, but I suspect that there is no patent issue, either since Leach does not claim a patent on his website. This is quite different from the Pass super symmetry ("X") patent, where he clearly has the right to prevent anyone from making the circuit.
There is not an issue with trademark infringement either, because Leach is not using his name in trade and you clearly identify your designs as based on his, with a number of changes. Leach gets credit for the portion of the work that he did and you are not making a profit on this.
While I do not practice intellectual property law, intellectual property violations are clearly a non issue for your Leach based designs. You may safely keep them up, if you desire.
While I admire your concern for other's intellectual property rights, there is no issue at least with US law.
Copyright protects the EXPRESSION of an idea, not the idea itself. Thus we can have many versions of the girl falls in love with a boy from the wrong side of the tracks story (Romeo and Juliet, West Side Story and Grease, for example) without copyright infringement.
As long as you do not publish Leach's articles as your own, you are not infringing. In all of your versions of the Leach amp there have been a number of changes, from the number of output devices, to the choice of devices. These changes, along with layout changes clearly take it out of the realm of copyright infringement.
I haven't looked, but I suspect that there is no patent issue, either since Leach does not claim a patent on his website. This is quite different from the Pass super symmetry ("X") patent, where he clearly has the right to prevent anyone from making the circuit.
There is not an issue with trademark infringement either, because Leach is not using his name in trade and you clearly identify your designs as based on his, with a number of changes. Leach gets credit for the portion of the work that he did and you are not making a profit on this.
While I do not practice intellectual property law, intellectual property violations are clearly a non issue for your Leach based designs. You may safely keep them up, if you desire.
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