525 build thread

[Denyle Guitars]

A-Designs apparently has a 1u dual module powered rack on the way for $300. Looks like it would be great for these 525's.

 

[Purusha]

300$ IMHO is still a lot for such product... I could probably offer them for less than 100€ and considering
the DIY PSU parts all together can't go over 150€ per one dual rack... probably even much less than that.

 

[Denyle Guitars]

Well sure, they can be made for less. If someone wants to offer a chassis kit/psu pcb combo, the price would come down significantly and I'd be all over that. OTOH, the cost and effort to build a one-off from a blank enclosure (if you don't have a metal shop) makes the A-Designs rack look pretty good.

 

[babyhead]

I'm just going to put them in a 1 space rack just because I dont have the API chassis and have no plans on getting one. Then I can disguise it!

-BH

 

[peter purpose]

Lunch boxes and their larger brethren are a little more complex than a box.
2-11 connectors have to be accommodated. Either by a pcb or inter panel.
Not saying it's rocket science, but a simple box it aint.

peter

 

[gar381]

[quote author="Purusha"] I could probably offer them for less than 100€ and considering [/quote]

I would be VERY interested tat. :thumb:

GARY

 

[Purusha]

Sure, I just need someone to help me with all the measures :thumb:

 

[okgb]

Now that is a case i'd be interested in !
but what drives the cost up ?

It's part of what makes my projects expensive to the point ,
of just buying comercial things already

Might as well start a separate thread , to leave this one for
circuit build questions .

regards Greg

 

[Purusha]

Might as well start a separate thread , to leave this one for
circuit build questions .

Good idea. I just started a new thread HERE

 

[Brizco]

started building:
now i have some questions:

what is cr6? have i overseen something?

what is "mode" under the lm319 ?


of course there are coming more questions

thanks!

 

[peter purpose]

CR6 is a diode. 1N4004, as are they all.
Check the schematic.

Mode can change from lighting a single led to lighting them all.
Use a jumper or a switch.

peter

 

[Brizco]

thanks! ive overseen that!

more questions

i can substitute the 2n5087 with bc560c, right?

it doesnt matter if i use bc184c or bc184b, right?
184b has a lower minimal value for the small signal current gain than the 184c, 184c has higher maximal value than the 184b)

can i substitute the vcr2n with a vcr4n ?
(vcr2n has a max. drain-source resistance of 60ohm, the vcr4n of 600ohm)


thanks a lot!
bye
martin

 

[peter purpose]

<<i can substitute the 2n5087 with bc560c, right? >>

Yes, but watch orientation. Collector is marked.

<<it doesnt matter if i use bc184c or bc184b, right? >>

Probably. Any of the usual suspect hfe matched NPN input pair will get the job done.

<<can i substitute the vcr2n with a vcr4n ? >>

I'd say no.

peter

 

[capnspoony]

Been doin' this for quite some time and I might be blind.... where in the world is R64 -- 3k9?

When I blow up the schematic I can't read it. Is there anyway to get a larger one hosted on the this thread?

EDIT:

Also, are we allowed to only put the .39uf cap in for the (150nf+220nf) ?

so far so good!

best

Richie

 

[Walrus]

R64 is on the bottom of S5 B.

 

[peter purpose]

Pay attention at the back of class.....
http://www.twin-x.com/groupdiy/albums/userpics/525.jpg

<<where in the world is R64 >>

As Mr. Walrus says .. tis on the rotary switch.

<<are we allowed to only put the .39uf cap in>>

I'll allow it just this once..!!
I used 2 caps to make up the value-ish. I couldn't find .39uF anywhere.
If you've got em, use em.
peter

 

[capnspoony]

Thank you Peter... I can see it now!

I'm sure they'll be more questions- I better move up to the front row :green:

--Richie

 

[babyhead]

I really really like the 'nod to the skeptics'

Very nice touch.

So how do we mount the meter board?

:guinness: :guinness: :guinness:

 

[kazper]

[quote author="babyhead"]I really really like the 'nod to the skeptics'

Very nice touch.

So how do we mount the meter board?

:guinness: :guinness: :guinness:[/quote]

Kazper raises his hand and get's called on..

The 3 pots are connected to it and it's held in place by them. Check out peters pic's on page 7 or 8 of this very thread.



Cap-N-Spoony it looks like your stuff finally arrived, Hopefully unscavenged by the natives where it was held up at.

I started stuffing mine today, with what's in my hiddy hole and see where that get's me till it's next time for a store run.

Kevin

 

[shabtek]

mine says

nod to the septics

will it still work?