Another PCB Layout - Gilmore Dynalo / Dynamid - Page 19

You can save money if you like by using the CMF60 instead of the RN60:

http://ca.mouser.com/ProductDetail/Vishay-Dale/CMF6024R900FHEK/?qs=sGAEpiMZZMu61qfTUdNhG6m%2fO%252b4TgF7jIIvngwgJgfg%3d

Same part, just different markings on the exterior.

But with mouser there is only one problem

Delivery Charge: 40,00 €

How about these:

http://uk.farnell.com/vishay-bc-components/mrs25000c2499fct00/resistor-mrs25-1-24r9/dp/9466347

Not sure where in Europe you are. The BC resistors are decent. You need to stay around 25 ohms for these or the output current will increase (too low) or decrease (too high), You could always parallel pairs of 49.9 ohm for example.

Hi

Finally I decided to use Elpod Resistors. They are Polish made, price similar to Dale (if You order 50pcs)  and what most important they have positive opinions.

Is there a way to source one of those PCBs ?

I don't think there are any more boards available anywhere.

If there was enough interest, maybe someone would do another run.

The best spot for information is here.

Maybe with D. J. Gardner's permission, you could use his layouts.

Thanks for the fast reply, what did you mean by using his layout ? (I mean using it in a group by, so that way I can give back something to the community, or using it just to make 2 for myself ?)

And what about the power supply, does an AMB sigma11 will be good enough, or I should look somewhere else for a better power supply - in case I can get hold of a PCB

Actually, the σ22 would be a good power supply to use.

The Dynalo needs a dual rail power supply.

In the DIY community, it is just polite to ask if you want

to use someone else's design. Many people state up front

that their design is free to copy or modify as long as it is

for DIY purposes. If you ask politely, he may even let

you use his Gerbers (the design files you send to the board house).

The only caution for the Dynalo is the the parts are getting a bit rare.

Make sure you have a source for parts before you get a board made.

Yeah, I was looking at the transistors, they are getting pretty expensive (I can get them from AMB or off ebay, matched or cheap - i do not know if these are genue or not), is there any other parts that I should worry about ?

There is also this undergoing final testing, with a bipolar front end and all available parts

prototype

http://gilmore.chem.northwestern.edu/multiamppic.jpg

should be final version

http://gilmore.chem.northwestern.edu/kgdynalobal2.jpg

It certainly looks good, does it use the same hard to find transistors, or something else ?

Answer to post 279:

Both the input FETs and output transistor are out of production.

The input FETs were already changed once from the original

design due to lack of components ( the original input FETs were

2SJ109/2SK389).

Linear Systems now makes replacements for 2SK170 (LSK170)

and the 2SK389 (LSK389).

Too bad they don't have (yet) replacements for either 2SJ109 or 2SJ74.

I see AMB still has stock on all the FETs and transistors for the Dynalo,

so you have stock if you can afford the price. AMB used to have Dynalo

boards but I guess the stock is all gone. Maybe you can ask him if he

is planning any more boards.

Hey, that looks good Kevin. Do you have a projected kit cost?

Quote:

Originally Posted by kevin gilmore 

There is also this undergoing final testing, with a bipolar front end and all available parts

prototype

http://gilmore.chem.northwestern.edu/multiamppic.jpg

 

should be final version

http://gilmore.chem.northwestern.edu/kgdynalobal2.jpg

By the way that is a balanced board.

I have no idea what it is going to cost.

that340 input chip is $6.40

opa445 if you want to run +/-20 are $11 each or $6.50 each in smt plus the brown dog adapter  (2 are needed)

everything else is pretty cheap.

 If you can get the singles fets, 4 fets fit

nicely into the socket in place of the that340. And there

are 2 different kinds of feedback one is supersymmetry.

I'll wait for this, it looks interesting, will it be able to drive my K1000s ? and where can I read more about this project ?