Universal Passive EQ
- Thread starter ruffrecords
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ruffrecords
Well-known member
anjing said:
The thought had crossed my mind but I have not yet done anything about it. I will look into it.
Cheers
Ian
ruffrecords
Well-known member
Here's a first draft of the PCB layout for the universal EQ. It's a bit ugly right now and needs some tidying up but it does look as though it will fit in a single Eurocard. I have placed an EZ Tube Mixer connector at one end just to see if it fits. If you don't use the connector the PCB has four mounting holes so it could fit easily in a 1U rack for example.
Cheers
Ian
Edit: Oops, forgot the pic!!
Cheers
Ian
Edit: Oops, forgot the pic!!
Attachments
ruffrecords
Well-known member
TimS said:
Oops! Fixed that. I am going to try to make this as single sided as possible so I can release the layout for those who want to make their own for personal use. I also need to add a footprint for Chrion's inductors.
Cheers
Ian
ruffrecords
Well-known member
Here is the latest version of the PCB layout for the Universal EQ. The main changes are the inclusion of a new combined Carnhill/ Chrion inductor footprint and I have managed to move all the signal tracks to one side of the PCB to make it easy for home etchers. The only thing on the other side of the PCB now is 0V. As I may have mentioned I plan to open source this layout for personal use so I will be making the Gerber files available when it is done.
The inductors are tracked to the Carnhill part of the combined footprint and I have left the Chrion pins unassigned to give people the maximum flexibility.
I have also gone a long way towards making the PCB component idents tie up with the schematic - always a good thing - and with a bit more tweaking it should be just about there. The only other thing I might do is bring out some of the pins of the (optional) 32 way connector to pads so it is easy to connect into the EZ Tube Mixer project.
Cheers
Ian
The inductors are tracked to the Carnhill part of the combined footprint and I have left the Chrion pins unassigned to give people the maximum flexibility.
I have also gone a long way towards making the PCB component idents tie up with the schematic - always a good thing - and with a bit more tweaking it should be just about there. The only other thing I might do is bring out some of the pins of the (optional) 32 way connector to pads so it is easy to connect into the EZ Tube Mixer project.
Cheers
Ian
Attachments
ruffrecords
Well-known member
I think the PCB is now finished. I have tidied up various bits, rationalised the connector numbering, corrected a few errors, added connections to the optional 32 way connector and added an optional resistor RP across the Helios style low cut so it can be made shelving if desired.
We now need to talk about how this PCB is made available. As I mentioned before I am happy to 'open source' the PCB layout and I have managed to get all the signal tracking on one side to assist this. The only thing on the other side is a 0V plane. So can the home etchers please chime in about the form they would like to get the Gerbers? I don't know if an earth plane is easy or a PITA. If it is a pain then I can easily do a version with the 0V tracked in the normal manner rather than as a plane. Let me know what you would like.
For those who don't want to make their own PCB I am happy to do a group buy at cost in the black market if there is enough interest. Once the group buy is done I'll offer the PCB on my white market page.
Cheers
Ian
Edit: oops forgot the pic of the final PCB.
We now need to talk about how this PCB is made available. As I mentioned before I am happy to 'open source' the PCB layout and I have managed to get all the signal tracking on one side to assist this. The only thing on the other side is a 0V plane. So can the home etchers please chime in about the form they would like to get the Gerbers? I don't know if an earth plane is easy or a PITA. If it is a pain then I can easily do a version with the 0V tracked in the normal manner rather than as a plane. Let me know what you would like.
For those who don't want to make their own PCB I am happy to do a group buy at cost in the black market if there is enough interest. Once the group buy is done I'll offer the PCB on my white market page.
Cheers
Ian
Edit: oops forgot the pic of the final PCB.
Attachments
Ian, count me in for two.
Hi Ian!
I'll take at least 2, maybe six. I might change to this eq rather then the older 3 band pultec...your going to fast! It's hard to adapt.
I really love that you have included the chrion footprint. I love the carnhill but to order those to canada, i get prohibitive shipping costs.
Regards,
Pierre
I'll take at least 2, maybe six. I might change to this eq rather then the older 3 band pultec...your going to fast! It's hard to adapt.
I really love that you have included the chrion footprint. I love the carnhill but to order those to canada, i get prohibitive shipping costs.
Regards,
Pierre
simrfid
Member
Hi Ian ! ... Many thanks for all your projects. You can also count 2 Unieq PCB for me if they are made !
shabtek
Well-known member
Interested in GB here....
how about an adapter board that lets us connect .1" pin headers\ribbon cable to a grayhill switch
how about an adapter board that lets us connect .1" pin headers\ribbon cable to a grayhill switch
mylesgm
Well-known member
I'm in for the GB, could do 6 I think.
ruffrecords
Well-known member
OK, seems there is good interest in GB so I'll set up av thread in the BM.
Cheers
Ian
Cheers
Ian
ruffrecords
Well-known member
shabtek said:
That's a very good idea which you and I have discussed in the past. I think I even did rough PCB layout. I will check my files.
Cheers
Ian
shabtek
Well-known member
excellent;can this adapter board double as a dummy stepped switch\potential divider
---would require an extra pad or 2 per position
---would require an extra pad or 2 per position
ruffrecords
Well-known member
shabtek
Well-known member
thats close--can that second pole be made available,
and an extra pad per throw--maybe a 3rd row of 0.1" to accommodate daisychaining resistors.
i like where this is going
and an extra pad per throw--maybe a 3rd row of 0.1" to accommodate daisychaining resistors.
i like where this is going
ruffrecords
Well-known member
shabtek said:
Right now it's tracked to work with the 16 way header used in the universal EQ for the three inductor based EQ sections. But, there are also four RC sections that use only a 10 way header so I am looking at how to include these too.
To bring out the other wiper should quite straightforward - probably connect it to the spare pair of pins. Adding an extra row of 0.1 spaced pins enroute so to speak should be OK too.
Cheers
Ian
Hi Ian,
As a person who would love to do at least one home etch to test in my EZTube Mixer protochannel, I can say that I would rather do a single sided board.
I'm not opposed to tryin a dual sided but I've never done one so...
Also, Looking at the PCB pics you posted I don't see the ground plane so I can't gauge how difficult it might be to line up the 2 sides (during development of the resist).
Just my .02,
Dave
As a person who would love to do at least one home etch to test in my EZTube Mixer protochannel, I can say that I would rather do a single sided board.
I'm not opposed to tryin a dual sided but I've never done one so...
Also, Looking at the PCB pics you posted I don't see the ground plane so I can't gauge how difficult it might be to line up the 2 sides (during development of the resist).
Just my .02,
Dave
ruffrecords
Well-known member
wave said:
On the picture I posted the ground plane is shown as the red rectangle - everything inside it is the ground plane.
I will do an open source version without the ground plane and I will track the 0V points together on the other side of the PCB. Then, if you want to do a single sided version you can just hand wire the points together on the non etch side of the PCB. When it is done I'll post the Gerbers as a zip file on my web page.
Cheers
Ian
