Hi
Please count me in for 2 boards.
Can I suggest that opt for the best quality boards versus going for cheapies even if it means it cost a bit more.
How dos this work- do we pre-pay and who should we pay ?
Jozua
Cape Town
South Africa
Please count me in for 2 boards.
Can I suggest that opt for the best quality boards versus going for cheapies even if it means it cost a bit more.
How dos this work- do we pre-pay and who should we pay ?
Jozua
Cape Town
South Africa
Hi Jozua-
I "think" the competition is good enough that most companies will have comparable products if the cost is in the same range.
We are not going from $10 boards to $2 boards where the quality would be drastically different. But I do think that as long as we collaborate like did we can find the best price performance ratio.
Hi All-
As for payment, I will have a Wiki set up on Monday and I already have a Paypal account.
I hope to place the order for the boards around the 15th and rx them around the first week of the New Year. A two - three week turn around.
Edit-
I would like to use the TO-3 style but I know the TO-220 will be easier so I will most likely go that way. Also I will be having a chassis built for mine. It will be a vertical chassis similar to the ML #33 but heat sinks only on one side. I will draw the chassis and get an estimate from my machinist next week hopefully. If anyone is interested it will be VERY easy for him to do a run of more than one.
I "think" the competition is good enough that most companies will have comparable products if the cost is in the same range.
We are not going from $10 boards to $2 boards where the quality would be drastically different. But I do think that as long as we collaborate like did we can find the best price performance ratio.
Hi All-
As for payment, I will have a Wiki set up on Monday and I already have a Paypal account.
I hope to place the order for the boards around the 15th and rx them around the first week of the New Year. A two - three week turn around.
Edit-
I would like to use the TO-3 style but I know the TO-220 will be easier so I will most likely go that way. Also I will be having a chassis built for mine. It will be a vertical chassis similar to the ML #33 but heat sinks only on one side. I will draw the chassis and get an estimate from my machinist next week hopefully. If anyone is interested it will be VERY easy for him to do a run of more than one.
Jan,
Cool, would you mind putting together an output board for these (preferably with 3 pairs of each)?
Thanks again for all your help!
Regards
Cool, would you mind putting together an output board for these (preferably with 3 pairs of each)?
Thanks again for all your help!
Regards
As I earlier have promissed, I'll will make the layout of the output board 😉 Do you want the option for some 2R2 to 10R base resistors ???
If you do 3 pair of outputtransistors per rail and not 2 pair, are ther other things that change, resistorvalues par example?
Instructions
I'm in for 2 boards if there is a way to figure out what goes where on the boards. Like a schematic and parts list that match to the board silkscreen for a basic design. So I've been following this thread and I think there is something like this underway, if so put it in the wiki and lets go.
I'm in for 2 boards if there is a way to figure out what goes where on the boards. Like a schematic and parts list that match to the board silkscreen for a basic design. So I've been following this thread and I think there is something like this underway, if so put it in the wiki and lets go.
To ACD : Jan, whatabout to make " rail " PCB for ten parallel transistors and let each guy to cut it what number of transistors he can ? Made it on one sided PCB must not be expensive 😎 .
Hi rabstg,
I am also considering to use the to-3 style.
Do you have the estimated cost of your chassis now?
Wing
I am also considering to use the to-3 style.
Do you have the estimated cost of your chassis now?
Wing
Hi jajabin-
You mean something like this?
http://www.delta-audio.com/Krell-Clone/Krell-Clone_KSA-50_Schematic.pdf
You mean something like this?
http://www.delta-audio.com/Krell-Clone/Krell-Clone_KSA-50_Schematic.pdf
rabstg said:
Hi rabstg,
yep, I am talking about using mjl21193 and mjl21194.
They are in TO-3 package, right?
I just wonder how much your chassis cost.
THanks
Wing
not quite
Sorry, the mjl21193/4 are in plastic packages, (to247 perhaps?) this shouldn't pose any problem, any place you can attach a TO3 will accomodate one or two of the others. The mj15003/4 are in to3, and as far as I know there are no specific plastic versions, unless you count the mjl21193 etc.
Stuart
Sorry, the mjl21193/4 are in plastic packages, (to247 perhaps?) this shouldn't pose any problem, any place you can attach a TO3 will accomodate one or two of the others. The mj15003/4 are in to3, and as far as I know there are no specific plastic versions, unless you count the mjl21193 etc.
Stuart
Stuart is right.
I made mistake...
I meant, I prefer to use the MJ15003 and MJ15004.
Thanks Stuart
Wing
I made mistake...
I meant, I prefer to use the MJ15003 and MJ15004.
Thanks Stuart
Wing
wim:
No changes on the components need on the main PCB for using
2x3 output devices 😉
All:
Should I go for the rail board as suggested by Pavel (Upupa Epops)
No changes on the components need on the main PCB for using
2x3 output devices 😉
All:
Should I go for the rail board as suggested by Pavel (Upupa Epops)
Output Board
The rail sounds fine. I plan on using the MJL tansistors in mine.
George
ACD said:
The rail sounds fine. I plan on using the MJL tansistors in mine.
George
To ACD and all : Jan, I was thinking about conception of rails : Only correct rail is realy rail - aluminium or dural prism. If you use TO 264 case transistors, you must to use prism 10*30 mm. If you make PCB screwable to prism, you can use this prism also like voltage conductor, which will have much lower resistance than copper trace on PCB, so you get quite precision current feeder and also temperature feedback of all power devices will be much more better than by " classical " conception ( on this prism you can get also temperature sensor transistor ).