digital attenuator

[digger945]

[Kerry]

I don't mind doing this. Please PM me if you want in on the SMD version of the attenuator with how many boards you would like and I'll post the totals in this thread. Per Kevin, they will be approximately $15.28 + shipping depending on the final count.

[grawk]

for fully assembled boards? I'll take 4

[Kerry]

Sorry. This didn't include assebmly / parts / etc.

If enough people are interested in assembed boards, we can look into that as well. Please let me know if you are interested in "Assembled", "Boards Only" or "Either" (include preference).

Edited April 13, 2011 by Kerry

[luvdunhill]

2 please, boards only (or boards plus relays)

Edited April 13, 2011 by luvdunhill

[ujamerstand]

I would be interested in boards. I've been waiting for a good, reliable, relay based attenuator solution. If we are doing a GB on the relays I'd be interested in that as well.

[deepak]

Sorry. This didn't include assebmly / parts / etc.

If enough people are interested in assembed boards, we can look into that as well. Please let me know if you are interested in "Assembled", "Boards Only" or "Either" (include preference).

pm sent

[cetoole]

In for either, say 4 sets.

[Kerry]

Seems like we could use different voltage relays (other that 12V) provided the coil current is under 500mA. Just wanted to double check this.

EDIT: Also the digital voltage could support 5V as well.

EDIT2: Nevermind. I see the address ID jumper.

Edited April 13, 2011 by Kerry

[manaox2]

In for two assembled boards.

[El_Doug]

The programming is way out of my league - I'd be in for 2 boards, assembled or blank, if I could get pointed in the right direction as far as control

[Kerry]

PLEASE SEE POST FOR THE LATEST COUNTS.

Here's where we currently are:

Name - Count - Preference

grawk - 4 - A

Driftwood - 6 - EA

luvdunhill - 2 - B

ujamerstand - 4 - B

deepak - 3 - A

cetoole - 4 - E

manaox2 - 2 - A

el_doug - 2 - E

DouglasQuaid - 2 - EA

jgazal - 2 - A

Lil Knight - 4 - A

nattonrice - 4 - E

kevin gilmore - 4 - EA

looser101 - 6 - E

chinsettawong - 2 - E

Kerry - 6 - B

Fing - 4 - A

Preferences: A = Assembled; B = Board Only; E = Either; EA = Either-Assembled Preferred

If I have it wrong here or you would like to change something please PM me.

Just a reminder. Please PM me all requests so we can keep the thread clean. I'll post an update at the end of the day (will be on vacation soon so I hope I can keep up).

Also, depending on the pricing for assembly we may or may not end up doing this. I will reach out tomorrow for pricing based on a few different quantities.

Also, sounds like a group buy for relays might be a good idea as well.

Edited April 19, 2011 by Kerry

[ujamerstand]

EDIT2: Would it be useful to add some address jumpers so that you could control the left and right channels of a balanced amp separately? One jumper per board might be enough for this.

This would be quite useful. I could imagine attenuating two separate streams to two different people. Or do channel matching for testing headphones.

[Grahame]

^ or use as a balance control.

[chinsettawong]

Please count me in for 2 sets of PCB or assembled version.

Wachara C.

Edited April 13, 2011 by chinsettawong

[n_maher]

I thought kevin said that the surface mount version would have to beat machine assembled?

[kevin gilmore]

depends on how good you are and if you buy the tacking glue.

I can assemble it. I DON'T really want to assemble it.

[Fing]

4 x assembled boards (+ relays) for me please.

[digger945]

Is there a place for onboard pull up resistors for the 8574?

[kevin gilmore]

yep, on the back. look at the pdf file.

updated picture

http://gilmore.chem.northwestern.edu/attenuator5.jpg

Edited April 13, 2011 by kevin gilmore

[luvdunhill]

You might consider longer landings for the relays, if it's even possible. That greatly aids assembly.

[kevin gilmore]

relay pads are 1.2 x 2.2 mm as specified by omron...

what size do you want?

edit:

i'm thinking that programming this is gonna be very easy

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

Edited April 13, 2011 by kevin gilmore

[DouglasQuaid]

I don't know about the resistors, but I've hand-wired G6k-2F relays before. They're the same distance between pins as the G6SK, and the same thickness of the leads, just two less pins.

Soldering them to a pcb isn't really that bad. So bare boards are perfectly fine with me.

[Kerry]

PLEASE SEE POST FOR THE LATEST COUNTS.

Here the new board counts:

Name - Count - Preference

grawk - 4 - A

Driftwood - 6 - EA

luvdunhill - 2 - B

ujamerstand - 4 - E

deepak - 2 - A

cetoole - 4 - E

manaox2 - 2 - A

el_doug - 2 - E

DouglasQuaid - 2 - EA

jgazal - 2 - A

Lil Knight - 4 - A

nattonrice - 4 - E

kevin gilmore - 4 - EA

looser101 - 6 - E

chinsettawong - 2 - E

Kerry - 6 - B

Fing - 4 - A

blubliss - 4 - EA

n3rdling - 4 - EA

guzziguy - 2 - E

Pars - 2 - B

Nebby - 4 - EA

TOTAL 76

Preferences: A = Assembled; B = Board Only; E = Either; EA = Either-Assembled Preferred

Please let me know if I've made any mistakes.

Also, can anyone pull a BOM together real quick. It doesn't have to be perfect, but I need one to send over to the manufacturer to get a quote on the assembly. I would do it, but I'm not going to have time tonight.

Thanks

Edited April 19, 2011 by Kerry

[ujamerstand]

which resistor are we using here? These? Also relays? I'll quickly put one together.

Edited April 14, 2011 by ujamerstand