ruffrecords

DB25 summing PCB - MK2??
« on: April 12, 2013, 05:59:21 PM »
Does anyone know where I can get a simple PCB that accepts a PCB mounting DB25 connector and wires it up, to the Tascam standard, to a bunch of summing resistors bringing the result out to a couple of pads or a terminal block. Select switches, mono inputs or pan pots are not needed.  I searched around the group and found various projects but nothing this simple.

Cheers

Ian
« Last Edit: January 16, 2017, 05:38:41 PM by ruffrecords »
www.customtubeconsoles.com
https://mark3vtm.blogspot.co.uk/
www.eztubemixer.blogspot.co.uk


'The only people not making mistakes are the people doing nothing'


dmp

Re: DB25 summing PCB
« Reply #1 on: April 12, 2013, 06:05:09 PM »
Holger made this exact PCB. Pics here:
http://www.groupdiy.com/index.php?topic=50088.msg633868#msg633868
I pmd him awhile ago and he said he might do a small run...
 I'm interested in a few.


ddt

Re: DB25 summing PCB
« Reply #2 on: April 12, 2013, 06:40:11 PM »
Hi Ian,

This might also be of interest: http://www.groupdiy.com/index.php?topic=29082.0

Cheers,
Dan

[edit: Ah, sorry, that's not actually wired according to the Tascam format unfortunately]
« Last Edit: April 12, 2013, 06:48:42 PM by ddt »

Holger

Re: DB25 summing PCB
« Reply #3 on: April 13, 2013, 05:57:30 AM »
Holger made this exact PCB. Pics here:
http://www.groupdiy.com/index.php?topic=50088.msg633868#msg633868
I pmd him awhile ago and he said he might do a small run...
 I'm interested in a few.
Shame on me... If there are some people interested in this I could do a new run, maybe redesigning it a bit.
We should move this to the BM.

ruffrecords

Re: DB25 summing PCB
« Reply #4 on: April 13, 2013, 06:12:43 AM »
Holger made this exact PCB. Pics here:
http://www.groupdiy.com/index.php?topic=50088.msg633868#msg633868
I pmd him awhile ago and he said he might do a small run...
 I'm interested in a few.
Shame on me... If there are some people interested in this I could do a new run, maybe redesigning it a bit.
We should move this to the BM.

I would be in for at least 8. By all means take this to the BM

Cheers

Ian
www.customtubeconsoles.com
https://mark3vtm.blogspot.co.uk/
www.eztubemixer.blogspot.co.uk


'The only people not making mistakes are the people doing nothing'

ruffrecords

Re: DB25 summing PCB
« Reply #5 on: April 13, 2013, 12:48:05 PM »
Can't seem to find this info anywhere - is the db25 on the back of equipment male or female?

Cheers

Ian
www.customtubeconsoles.com
https://mark3vtm.blogspot.co.uk/
www.eztubemixer.blogspot.co.uk


'The only people not making mistakes are the people doing nothing'

Re: DB25 summing PCB
« Reply #6 on: April 13, 2013, 02:42:18 PM »

Walrus

Re: DB25 summing PCB
« Reply #7 on: April 13, 2013, 08:37:17 PM »
Can't seem to find this info anywhere - is the db25 on the back of equipment male or female?

Cheers

Ian
Normally female.
Kevin.

ruffrecords

Re: DB25 summing PCB
« Reply #8 on: April 14, 2013, 02:17:00 PM »
Can't seem to find this info anywhere - is the db25 on the back of equipment male or female?

Cheers

Ian
Normally female.

Many thanks.

Cheers

Ian
www.customtubeconsoles.com
https://mark3vtm.blogspot.co.uk/
www.eztubemixer.blogspot.co.uk


'The only people not making mistakes are the people doing nothing'

ruffrecords

Re: DB25 summing PCB
« Reply #9 on: April 14, 2013, 04:28:49 PM »
Holger tells me he has too much work on to spend time on this PCB so.... here is version 1 of my very simple db25 summing PCB. It is 50mm by 60mm and takes a single db25 right angle PCB mounting connector. There's just 16 resistors and four terminal blocks. The idea is you can mount them in a row and just daisy chain them together. I have labelled the buses Odd and Even rather than left and right to reflect the channel numbering of the Tascam pin out.

I shall make a bunch for myself. If anyone else is interested let me know.

Cheers

Ian
www.customtubeconsoles.com
https://mark3vtm.blogspot.co.uk/
www.eztubemixer.blogspot.co.uk


'The only people not making mistakes are the people doing nothing'


Harpo

Re: DB25 summing PCB
« Reply #10 on: April 14, 2013, 05:49:24 PM »
Ian, a placeholder for the odd and even shunt resistors might be a nice to have on pcb.
A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools.  -Douglas Adams

ruffrecords

Re: DB25 summing PCB
« Reply #11 on: April 15, 2013, 03:49:15 AM »
Ian, a placeholder for the odd and even shunt resistors might be a nice to have on pcb.

Good thinking. I will add them.

Cheers

Ian
www.customtubeconsoles.com
https://mark3vtm.blogspot.co.uk/
www.eztubemixer.blogspot.co.uk


'The only people not making mistakes are the people doing nothing'

ruffrecords

Re: DB25 summing PCB
« Reply #12 on: April 15, 2013, 03:35:03 PM »
Here is the V2 summer PCB layout. I have added positions for the shunt resistors and a 0.1inch pitch SIL as suggested by Holger so it can also be used as a db25 interface card. Lastly I corrected the completely erroneous tracking to the db25 connector.

Cheers

Ian
www.customtubeconsoles.com
https://mark3vtm.blogspot.co.uk/
www.eztubemixer.blogspot.co.uk


'The only people not making mistakes are the people doing nothing'

kpearsall

Re: DB25 summing PCB
« Reply #13 on: April 15, 2013, 11:18:07 PM »
was looking for something like this ;)
Would love to pick up a few boards if you make them


Ken

ruffrecords

Re: DB25 summing PCB
« Reply #14 on: April 16, 2013, 04:42:14 AM »
was looking for something like this ;)
Would love to pick up a few boards if you make them


Ken


I don't know how many I am going to get made yet. I need five right now so I'll probably get at least ten for myself. I guess the cost is going to be around 5GBP each.

Cheers

Ian
www.customtubeconsoles.com
https://mark3vtm.blogspot.co.uk/
www.eztubemixer.blogspot.co.uk


'The only people not making mistakes are the people doing nothing'

AudioHammer

Re: DB25 summing PCB
« Reply #15 on: April 16, 2013, 06:36:40 AM »
I would be in for four pcbs.

Joechris

Re: DB25 summing PCB
« Reply #16 on: April 16, 2013, 08:06:44 AM »
I take four as well...
musicians vary +/-9dB depending on mood, drugs, and line-voltage. (PRR)

kpearsall

Re: DB25 summing PCB
« Reply #17 on: April 16, 2013, 05:12:27 PM »
At Least 4 here

Re: DB25 summing PCB
« Reply #18 on: April 27, 2013, 04:04:55 AM »
I'll take 4

ruffrecords

Re: DB25 summing PCB
« Reply #19 on: April 27, 2013, 06:04:59 AM »
Holger's version of this PCB finally arrived despite postal strikes in both Germany and the UK. As a result I will be making a few tweaks to my design which I will post here before having some made.

Edit: Version three attached. I have made a few small changes after seeing Holger's version - mainly the addition of a ground plane over part of the PCB. Other than that I think that is it. If I don't receive any comments I'll send it out for manufacture at the end of next week.


Cheers

Ian
« Last Edit: April 27, 2013, 04:22:47 PM by ruffrecords »
www.customtubeconsoles.com
https://mark3vtm.blogspot.co.uk/
www.eztubemixer.blogspot.co.uk


'The only people not making mistakes are the people doing nothing'


 

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