Poor Man's Pultec EQP1-A

michal_k said:

a pair for me for sure. what's the width of the pcb? will it fit 51x front panel(1.5'')?

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It is currently 2.1 inches wide and 1.5 inches high so it should fit in a 1U rack. Of course, there is no reason why you should not mount it the other way to make it 1.5 inches wide and 2.1 inches tall but I don't think you would get two of them plus four pots in the 3U height of a 51x module. For that it would probably be better to do a design for a  right angle mounting rotary switch. I think Lorlin do some but I have not tried them.

Cheers

Ian

May have to go greyhill...

gemini86 said:

May have to go greyhill...

Click to expand...

That would be the obvious, but expensive, choice.

Cheers

Ian

OK, here is the Version 4 PCB layout. I have checked the footprint for the switch against the Lorlin, Alpha and RVFM parts. They all have the switch contacts on a 22mm or 22.2mm diameter and my footprint has them on 22mm. The wipers are on either 7.7mm or an 8mm diameter and my footprint has them on just under 8mm diameter. Pin sizes are 1.1mm and recommend PCB hole sizes are 1.4mm and 1.5mm so I have gone for 1.5mm so there should be plenty of slack to accommodate slight differences between switch manufacturers. I printed the layout onto a sheet of paper and offered up an Alpha switch to it and pushed its pins through the paper and it fitted dead on so I am fairly confident the layout is correct. However, before I go ordering 100 GBPs worth of PCBs it would be nice to have a little insurance. Someone mentioned making their own PCB so I would be happy to provide the gerber files to anyone who wants to make their own in exchange for confirmations that the rotary switch fits OK.

Any takers?

Cheers

Ian

ruffrecords said:

I think Lorlin do some but I have not tried them.

Click to expand...

The Lorlin ones seem good quality but i couldn't get them anywhere in MBB (for pre's)but don't think that matters here?
Oh they are also stackable, so could build a stereo version easily.
I can send u one to play with if u like?

mrclunk said:

The Lorlin ones seem good quality but i couldn't get them anywhere in MBB (for pre's)but don't think that matters here?

Click to expand...

Paul, look in the RS catalogue

Cracking stuff!

I've been away for a couple of days and I come back to see this is nearly ready to go! Well done guys.

I'd love two sets.

Rob Flinn said:

mrclunk said:

The Lorlin ones seem good quality but i couldn't get them anywhere in MBB (for pre's)but don't think that matters here?

Click to expand...

Paul, look in the RS catalogue

Click to expand...

Not sure if i see em...
You talking about these wafers.
http://uk.rs-online.com/web/1742676.html
Think the part number means its shorting but i thought the same before ordering whole switches from farnel.
(The switches are half the price at farnel)

stackable for stereo would be so killer.

mrclunk said:

ruffrecords said:

I think Lorlin do some but I have not tried them.

Click to expand...

The Lorlin ones seem good quality but i couldn't get them anywhere in MBB (for pre's)but don't think that matters here?

Click to expand...

It shouldn't matter as there is no dc to worry about.

Oh they are also stackable, so could build a stereo version easily.
I can send u one to play with if u like?

Click to expand...

That's a very generous offer. I'll PM you.

Cheers

Ian

[/quote]

mrclunk said:

Rob Flinn said:

mrclunk said:

The Lorlin ones seem good quality but i couldn't get them anywhere in MBB (for pre's)but don't think that matters here?

Click to expand...

Paul, look in the RS catalogue

Click to expand...

Not sure if i see em...
You talking about these wafers.
http://uk.rs-online.com/web/1742676.html
Think the part number means its shorting but i thought the same before ordering whole switches from farnel before.
(The switches are half the price at farnel)

Click to expand...

Paul never search on line it just doesn't find things

Try these numbers for a metric shaft.  They're not pcb mount but work if you cut the eyelet off with a pair of snips !
320-714
320-720
320-736
320-742
or if you prefer an imperial shaft
327-664
327-664A
327-670

ah no not those horrid things!
Sorry think we have our wires crossed, i was talking about this type
http://uk.farnell.com/lorlin/pt6434-bmh/switch-1pole-12-pos/dp/1123674
(rs do them also)

Ian, i started out down the post office and then realised the ones i have are 1pole 12pos not 2pole 6pos...
sorry.

mrclunk said:

ah no not those horrid things!
Sorry think we have our wires crossed, i was talking about this type
http://uk.farnell.com/lorlin/pt6434-bmh/switch-1pole-12-pos/dp/1123674
(rs do them also)

Click to expand...

ah ! Ok it's just when you mentionmed Lorlin ......

definitely up for 2 pcb pairs, excellent project!
cheers, tom

OK, looks like we are good to go on the PCB. The list of people who have expressed an interest in a set (2 PCBs) at present is:



Total   101 sets = 202 boards!!!  OK that's it. I have now placed the order. Price will be 5 gbp a set (2 pcbs)

Cheers

Ian

Edit: added Kamel, Audiohammer and guze
Edit: added Andreas Pfeiffer, noulou. mrclunk, Holger, Matthew Jacobs and danijel
Edit: price reduction to 5 GBP per set
Edit: chrispbass +2 sets, added Grooveteer, kantel1603 and 0dbfs then 3nity and Hank Dussen
Edit: added Citrus Hill, baadc0de, bovox and menigu
Edit: added Michael Tibes, Ptownkid, Davo and tzman
Added: MathisD, benlindell and gevermil
Edit: added hodad, mrclunk+1set, peterc, desol

hi all,

I'm in for 4 sets

thanks

I'm in for 2 sets.

Thanks!

i'm in for 2 sets also. great project!!!

2 sets for me please

2 here please