Are we talking super leach or extended Leach (that I use myself)?
I'll be happy to make a super leach layout, just tell me what transistors to use 🙂
\Jens
I'll be happy to make a super leach layout, just tell me what transistors to use 🙂
\Jens
I guess that the consensus as to the amp in need tilts towards the Leach super amp but that is up to everyone else. Personally I dont mind and would opt for anyone of the two as long as the power output is in the region of 200 -250 w or more at 8 ohms. Even though such power levels are overkills, nevertheless from my short experience, a high power amp is more versatile and is more likely to be useful for years to come than a smaller power one as evidenced by the Krells and the Levinsons of this world.
AS to the power transistor, I guess the choice is wide as long as it is readily available retaining the ability on the DIYer for stocking up should the need arise (more than likely)...
Do you have an estimate of a PCB cost of such a module with your markup?
AS to the power transistor, I guess the choice is wide as long as it is readily available retaining the ability on the DIYer for stocking up should the need arise (more than likely)...
Do you have an estimate of a PCB cost of such a module with your markup?
pcb
I wouldnt mind super amp pcb either.I have many of the transisitors that are on the original parts list So I would prefer them but I like to buy stuff that sits in the garage for years too.Check out this site prices look good for pcb's but not sure of quality, I am gonna do some of the low tim amp ,when I get time to draw them up. http://www.custompcb.com hey Jen looked at some of your web pages , Nice work.You are gonna give engineers a bad name.The ones I work with here are clueless and cant even dream about using tools.You do really good work.
I wouldnt mind super amp pcb either.I have many of the transisitors that are on the original parts list So I would prefer them but I like to buy stuff that sits in the garage for years too.Check out this site prices look good for pcb's but not sure of quality, I am gonna do some of the low tim amp ,when I get time to draw them up. http://www.custompcb.com hey Jen looked at some of your web pages , Nice work.You are gonna give engineers a bad name.The ones I work with here are clueless and cant even dream about using tools.You do really good work.
transistors
Hello , I am thinking of purchasing transistors in quantity.Would anyone be interested in getting some from me afterwards.I will not mark them.
Mj15003 and mj15004 pretty expensive 03 are 2.13$ in qty of 100 and 04 are 1.84 each per 100 so i am not getting them
price price price
mj15031 . 68 mj15030 .75 mpsa06 .03
mpsa56 .04 2n5416 .56 2n3439 .58
Hello , I am thinking of purchasing transistors in quantity.Would anyone be interested in getting some from me afterwards.I will not mark them.
Mj15003 and mj15004 pretty expensive 03 are 2.13$ in qty of 100 and 04 are 1.84 each per 100 so i am not getting them
price price price
mj15031 . 68 mj15030 .75 mpsa06 .03
mpsa56 .04 2n5416 .56 2n3439 .58
Expensive ?
Funny Guy !
http://www.bmm-electronics.nl/Product.asp?Product_ID=881
Oops, add 19 % sales tax please !
Funny Guy !
http://www.bmm-electronics.nl/Product.asp?Product_ID=881
Oops, add 19 % sales tax please !
http://www.onsemi.com/site/products/summary/0,4450,MJ15003,00.html
MJ15003/4
$1.87 in hundred quantities. You can get 25 as samples.
Similar deals on other transistors. Oh yeah, these are the real Motorola parts, not some knock-off or fake product.
Hmm, ordered parts at 1:34 pm yesterday California time and they just arrived by FedEx at 9:02am today.
Prosit
MJ15003/4
$1.87 in hundred quantities. You can get 25 as samples.
Similar deals on other transistors. Oh yeah, these are the real Motorola parts, not some knock-off or fake product.
Hmm, ordered parts at 1:34 pm yesterday California time and they just arrived by FedEx at 9:02am today.
Prosit
Time for a new thread maybe?
Hello,
Is it time for a Super Leach new PCB design thread?
I will gladly participate.
\Jens
Hello,
Is it time for a Super Leach new PCB design thread?
I will gladly participate.
\Jens
I think that would be great Jens. I am presently building one using TO-3 transistors. I would love to see a design that could utilize the flat packs.
Blessings, Terry
Blessings, Terry
I would love to have the Super Leach with a "Made in Danmark" sticker.
Either TO3, TO247, TO218 or MT200 works for me.
I can even have someone picking them up at your frontdoor.
(Maybe in time even a Threshold SA4 PCB, think of all the possibilities. Calm down,read a book
)
BTW : Did you guys know that the Danish are the happiest people in the world, maybe that is why they are so nice !
Either TO3, TO247, TO218 or MT200 works for me.
I can even have someone picking them up at your frontdoor.
(Maybe in time even a Threshold SA4 PCB, think of all the possibilities. Calm down,read a book
)BTW : Did you guys know that the Danish are the happiest people in the world, maybe that is why they are so nice !
Very good. So I guess the die has been cast. Lets start. To attract more stray DIYers we need a fancy new thread any ideas?
capacitor question ?
Do the large power supply have to be computer grade or will 10000uf 80v snap-in work okay ?And whats a good value for the caps.Would more then 10000uf better.I have seen many designs with more caps then two.
Do the large power supply have to be computer grade or will 10000uf 80v snap-in work okay ?And whats a good value for the caps.Would more then 10000uf better.I have seen many designs with more caps then two.
Jens,
Is the ordinary leach amp driver stage the same as the superamp one? If yes then we can start with easily the pcb I guess??
Is the ordinary leach amp driver stage the same as the superamp one? If yes then we can start with easily the pcb I guess??
comments about this beast......
it is really so rewarding to have been built a Leach.
my elder brother had just finished building one.
and still planning to built even more, I think for a 5.1 channel system
for his DVD.
actaully we have to thank Marshal Leach for his contributions
Jens, I'm hoping for more updates and more modifications about this
amp.
Just keep it up.....
and pls. post them on your site......
more power,
hienrich
it is really so rewarding to have been built a Leach.
my elder brother had just finished building one.
and still planning to built even more, I think for a 5.1 channel system
for his DVD.
actaully we have to thank Marshal Leach for his contributions
Jens, I'm hoping for more updates and more modifications about this
amp.
Just keep it up.....
and pls. post them on your site......
more power,
hienrich
Boards arrived wohoo!
Finally the boards arrived today
\Jens
Finally the boards arrived today
An externally hosted image should be here but it was not working when we last tested it.
\Jens
I hope this isn't too off topic but what transistors are people using for the VAS/predriver stage of this amp ? What's the board designed to take ?
jaycee said:
You can use BD139/140 for lower voltage models with rails below +- 40V and MJE340/350 for higher rails....
Transistors with similar pinout can also be used with caution
\Jens
- Status
- Not open for further replies.