Group Buy - Digital Attenuator (Kevin Gilmore)

[Aive]

Hey Soren, I've added myself to the list - are you still accepting additional orders? If so I will put through payment  Thanks mate.

[judo]

Payment sent. Thanks

[sorenb]

1 hour ago, Aive said:

Hey Soren, I've added myself to the list - are you still accepting additional orders? If so I will put through payment  Thanks mate.

No prob.
Anyone please do join. As long as the boards hasn't been ordered yet 

[b0bb]

Payment sent.

Thanks for organizing this.

[Skooby]

Payment sent for two boards.  Thanks.

[Kerry]

Payment sent.  Thx.

[greyrab]

Added myself to the spreadsheet and made payment. Thanks.

[Aive]

Payment sent  Thanks for organising this.

Edited January 25, 2016 by Aive

[GeorgeP]

Paid - thanks!

[sorenb]

Thanks to all who have paid.

Unfortunately I don't have a record of the paypal <-> Head-Case-ID of each and thus have no way of keeping track of who has paid.
Which is why I asked for: " Please transfer the amount stated in the spreadsheet to [email protected], putting "Group Buy DA, Head-Case ID" into the notes field.
 

Those participated in Caps or Circlotron GB I can figure out, but others I cannot unfortunately. Sorry for the inconvinience.
So people who have paid and not participated in Caps nor Circlotron GB please send me a mail with your Head-Case ID and shipping adress while we're at it ?

/S

Edited May 1, 2019 by sorenb

[chiguy]

Payment sent, thanks for organizing!

[shipsupt]

Looked like there was still room on the spreadsheet, payment sent, ID included in payment.

Thanks for putting it together.

 

[sorenb]

This is the relay needed for the Digital Attenuator

I have added the part to the spreadsheet here.
The price ea is USD4.39/ea, If more than 500 the price is < 3USD/ea.

The quantum price is contained in the sheet and thus the price (in the E8) will show actual price according to the total amount.
Please add the amount you want.

Thanks.

/S

[kevin gilmore]

partial schematic suitable for checking

http://gilmore.chem.northwestern.edu/attenuatorv2.pdf

board pictures

http://gilmore.chem.northwestern.edu/attenuatorsmtv42flipground7.pdf

 

[kevin gilmore]

the attenuator resistors are not actually 10k, they depend on attenuation per switch and total impedance.

 

 

Edited January 26, 2016 by kevin gilmore

[Aive]

Hey Soren, just sent you an email confirming Head-case ID, Paypal email address and shipping address. Just in case it ends up in your junk, yes I'm Jodi

[eggil]

payment sent. Thanks!

[shipsupt]

On 1/26/2016 at 6:29 AM, sorenb said:

This is the relay needed for the Digital Attenuator

I have added the part to the spreadsheet here.
The price ea is USD4.39/ea, If more than 500 the price is < 3USD/ea.

The quantum price is contained in the sheet and thus the price (in the E8) will show actual price according to the total amount.
Please add the amount you want.

Thanks.

/S

Added relays and send sent additional payment. 

Thanks.

 

[wokstarr26]

Adjusted SS for to 4 boards and 48 relays

Payment sent, mostly

Thank you for your effort in this GB

[luvdunhill]

You might also look at the NEC / TOKIN / (Kemet? lost track) EA2/EB2 series relays.

[Kerry]

Yeah.  Those particular relays are just an example of what can work.  Same foot print with 4.5V and low current (19x ohms for the Omron) would be fine.   

[sorenb]

Did a brief check at Mouser in rgrds to MAX's+resistors+capacitors ~ 70USD ...if buying in quantity > 25 sets ...it drops to some 35USD, if there's interest a Group Buy for the this can be done ...

Relays are due monday next week, and shipping of Dig.Att+relays will start hereafter unless people want combined ship with Über and/or Dig.Att.Kit

Sheet

Edited March 4, 2016 by sorenb

[Aive]

Thanks for the update soren

[samsie]

combined ship  will be great

[Pars]

What is in the Dig. Att. Kits?

The boards I have are the first version, so don't use the MAX chips, but I could be interested in the resistors, etc.