madbeanpedals::forum

General => Open Discussion => Topic started by: Muadzin on January 08, 2015, 09:54:16 AM

Title: PCB mounted pots/switches/LED's
Post by: Muadzin on January 08, 2015, 09:54:16 AM
Am I the only one who doesn't like them? Aside from being stuck to someone else's drill layout that is not always to my liking? I know PCB mounted pots, switches, and LED's significantly reduce the risk of making errors, not to mention get rid of a lot of spaghetti wiring. But I've found that once you do make a mistake and solder the wrong pot or switch in the wrong place you're really boned. Desoldering or resoldering wires is peanuts, but desoldering a pot, not as much. And heavens forbid if you have to desolder a switch. Might as well throw away the PCB, unless you have Godlike desoldering skills.

On a side note, for potential future use, if anyone has any good tips or tricks to desolder pots and switches from PCB's, feel free to share.
Title: Re: PCB mounted pots/switches/LED's
Post by: selfdestroyer on January 08, 2015, 09:58:57 AM
I love them. If I want to deviate from the drill pattern then I use one on board device to hold the board to the box. Like use the volume pot PCB mounted and then do off board wireing to all the others. I hate double sided tape and Velcro in my pedals.

Just my 2 cents.

Cody
Title: Re: PCB mounted pots/switches/LED's
Post by: LaceSensor on January 08, 2015, 10:09:54 AM
I dont see an issue. You can always run wires if you dont like the layout of the PCB...
Title: Re: PCB mounted pots/switches/LED's
Post by: sturgeo on January 08, 2015, 10:38:56 AM
I love them and am looking at moving all my 1590A pedals to all in one boards with on board components, possibly excluding the dc socket. I plan on investing in a desoldering gun for when the inevitable happens!

The difference is i generally make my own PCBs and CNC machine the enclosures, all to my own spacing. My 1590B builds have the effect with pots & switches board mounted, a 4 way ribbon to the bypass board which has a board mounted footswitch and dc socket, input & output jacks are still open frame.
Title: Re: PCB mounted pots/switches/LED's
Post by: raulduke on January 08, 2015, 11:17:55 AM
Love PCB mounted Pots.

As Lace says; you can always run wires to them if you don't like the drill layout.

They make for a fare cleaner build IMO.
Title: Re: PCB mounted pots/switches/LED's
Post by: peterc on January 08, 2015, 12:05:33 PM
Chromesphere did a video in which he featured desoldering. He had a large solder sucker that impressed me, so I bought one.

To desolder a joint now takes half the time and number of sucks.

Peter
Title: Re: PCB mounted pots/switches/LED's
Post by: drolo on January 08, 2015, 12:30:22 PM
Quote from: peterc on January 08, 2015, 12:05:33 PM
Chromesphere did a video in which he featured desoldering. He had a large solder sucker that impressed me, so I bought one.

To desolder a joint now takes half the time and number of sucks.

Peter
That same video made me upgrade my pump too. I just always though they were what they were, but getting a good one definitely improved the desoldering.

Title: Re: PCB mounted pots/switches/LED's
Post by: raulduke on January 08, 2015, 12:57:47 PM
The other thing that can make life easier (and cheaper) is to use normal pots (ie. with solder lug) as PCB mounted pots.

Solder some solid core wire legs on to each lug contact, and voila, you have a PCB mount pot.

This is how I do it anyhow (PCB mount alpha pots are quite expensive to get hold of in UK).

Other little tips I use:

* Add some sticky foam insulation behind the pots to prevent shorts. This will also give a little 'wriggle room' for fitting the pots.

* If desoldering the full pot is fiddly, then its easy to just snip of the pot and remove the wire legs individually from the PCB.

* If even more wriggle room is needed,  drill mounting holes on enclosures an little bit larger (ie. 7.5mm rather than 7mm). Use locking washer internally to fix the pots solidly when mounted.
Title: Re: PCB mounted pots/switches/LED's
Post by: GrindCustoms on January 08, 2015, 01:03:41 PM
Quote from: raulduke on January 08, 2015, 12:57:47 PM
The other thing that can make life easier (and cheaper) is to use normal pots (ie. with solder lug) as PCB mounted pots.

Solder some solid core wire legs on to each lug contact, and voila, you have a PCB mount pot.

This is how I do it anyhow (PCB mount alpha pots are quite expensive to get hold of in UK).

Other little tips I use:

* Add some sticky foam insulation behind the pots to prevent shorts. This will also give a little 'wriggle room' for fitting the pots.

* If desoldering the full pot is fiddly, then its easy to just snip of the pot and remove the wire legs individually from the PCB.

* If even more wriggle room is needed,  drill mounting holes on enclosures an little bit larger (ie. 7.5mm rather than 7mm). Use locking washer internally to fix the pots solidly when mounted.

But, do you even wriggle bro?  ;D

Bunch of great tips right here gents!
Title: Re: PCB mounted pots/switches/LED's
Post by: 96ecss on January 08, 2015, 01:08:02 PM
Quote from: raulduke on January 08, 2015, 12:57:47 PM
The other thing that can make life easier (and cheaper) is to use normal pots (ie. with solder lug) as PCB mounted pots.

Solder some solid core wire legs on to each lug contact, and voila, you have a PCB mount pot.

This is how I do it anyhow (PCB mount alpha pots are quite expensive to get hold of in UK).

Other little tips I use:

* Add some sticky foam insulation behind the pots to prevent shorts. This will also give a little 'wriggle room' for fitting the pots.

* If desoldering the full pot is fiddly, then its easy to just snip of the pot and remove the wire legs individually from the PCB.

* If even more wriggle room is needed,  drill mounting holes on enclosures an little bit larger (ie. 7.5mm rather than 7mm). Use locking washer internally to fix the pots solidly when mounted.

All great tips here. Plus, I have a Hakko desoldering gun which really helps if things go wrong.

Dave
Title: Re: PCB mounted pots/switches/LED's
Post by: raulduke on January 08, 2015, 01:10:39 PM
Quote from: GrindCustoms on January 08, 2015, 01:03:41 PM
Quote from: raulduke on January 08, 2015, 12:57:47 PM
The other thing that can make life easier (and cheaper) is to use normal pots (ie. with solder lug) as PCB mounted pots.

Solder some solid core wire legs on to each lug contact, and voila, you have a PCB mount pot.

This is how I do it anyhow (PCB mount alpha pots are quite expensive to get hold of in UK).

Other little tips I use:

* Add some sticky foam insulation behind the pots to prevent shorts. This will also give a little 'wriggle room' for fitting the pots.

* If desoldering the full pot is fiddly, then its easy to just snip of the pot and remove the wire legs individually from the PCB.

* If even more wriggle room is needed,  drill mounting holes on enclosures an little bit larger (ie. 7.5mm rather than 7mm). Use locking washer internally to fix the pots solidly when mounted.

But, do you even wriggle bro?  ;D

Bunch of great tips right here gents!

Hell no.... my build is perfect.... and my pedals ain't built bad either   ;);) ;D

In honesty though the post-christmas truffle shuffle is in full effect. Time to hit the gym and start 5-2 diet again   :-\:o
Title: Re: PCB mounted pots/switches/LED's
Post by: alanp on January 08, 2015, 03:13:35 PM
Beyond three pots, I think that you seriously need to consider PCB mounting everything. The wiring turns into spaghetti FAST, and it introduces more points of failure (an extra solder point for every lug, and also wire that can invisibly break for every lug.) It also means more work at the build stage, as opposed to the design stage.

Put it this way. I would NEVER have built a ten step sequencer with flying wires!
Title: Re: PCB mounted pots/switches/LED's
Post by: jubal81 on January 08, 2015, 03:15:11 PM
I think to answer your question: Yes, you are the only one. Hehe.
Title: Re: PCB mounted pots/switches/LED's
Post by: chordball on January 08, 2015, 04:06:37 PM
Board mount for sure! It's easy to run extra wires if you want to punish yourself though.  ;)
Title: Re: PCB mounted pots/switches/LED's
Post by: ddog on January 08, 2015, 04:29:03 PM
16mm pots arent that hard to desolder if you are willing to clip the legs. I usually just clip right on top of the long legs and just remove each leg one by one. You could probably convert that pot to a solder lug pot, but I usually just stick a new one in just in case. Same thing probably works for 9mm pots, but I haven't tried it with those
Title: Re: PCB mounted pots/switches/LED's
Post by: culturejam on January 08, 2015, 04:49:10 PM
Quote from: 96ecss on January 08, 2015, 01:08:02 PM
Plus, I have a Hakko desoldering gun which really helps if things go wrong.

Me too. Changed my life.  ;D

I can desolder a board-mounted pot in about 10 seconds.
Title: Re: PCB mounted pots/switches/LED's
Post by: rullywowr on January 08, 2015, 04:53:04 PM
Quote from: GrindCustoms on January 08, 2015, 01:03:41 PM
Quote from: raulduke on January 08, 2015, 12:57:47 PM
The other thing that can make life easier (and cheaper) is to use normal pots (ie. with solder lug) as PCB mounted pots.

Solder some solid core wire legs on to each lug contact, and voila, you have a PCB mount pot.

This is how I do it anyhow (PCB mount alpha pots are quite expensive to get hold of in UK).

Other little tips I use:

* Add some sticky foam insulation behind the pots to prevent shorts. This will also give a little 'wriggle room' for fitting the pots.

* If desoldering the full pot is fiddly, then its easy to just snip of the pot and remove the wire legs individually from the PCB.

* If even more wriggle room is needed,  drill mounting holes on enclosures an little bit larger (ie. 7.5mm rather than 7mm). Use locking washer internally to fix the pots solidly when mounted.

But, do you even wriggle bro?  ;D

Bunch of great tips right here gents!

You gotta wriggle it, just a little bit.   ;D (sorry just couldn't resist)

I love PCB mount pots.  It's all about the ease of population and increase of reliability.  PCB mount pots also solve the age old question of "how to secure the PCB inside the enclosure."  It's pretty rare these days that I will pop anything that doesn't PCB mount pots.  This goes double for Vero.  A layout has to be really piquing my interest if I etch a non-PCB mounted board or do a Vero layout...otherwise I would rather make my own layout and wait a few days just for the ease of building and increased reliability.

I was like you.  I resisted for a while.  I had only solder mount type pots.  I eventually started soldering thick resistor leads to solder pots and eventually migrated my entire stock over to PCB mount pots. 

The day I started going with PCB mount pots, my builds became much more professional and reliable.  If you aren't totally happy with the PCB mount layout of a project, simply use one PCB mount location (to support the board) and off-board wire the rest.

It also helps that I am fortunate enough to have one of these bad mama jammas.
Title: Re: PCB mounted pots/switches/LED's
Post by: pickdropper on January 08, 2015, 05:01:15 PM
If you want to get funky and aren't averse to buying somewhat spendy equipment, desoldering tweezers with blade tips can work great.  I have Metcal tweezers and I can desolder all three pins of a board mount pot at the same time. Then I just remove the solder from the board one hole at a time with a wick or solder sucker; it works great.

(http://images.weidinger.eu/products/800.070-mx-ptz.jpg)
Title: Re: PCB mounted pots/switches/LED's
Post by: raulduke on January 08, 2015, 05:23:03 PM
You can also buy blade tips for certain soldering irons (not sure if Hakko does one).

Remove the whole pot with blade tip and then desolder the pads as per usual.
Title: Re: PCB mounted pots/switches/LED's
Post by: pickdropper on January 08, 2015, 05:40:05 PM
Quote from: raulduke on January 08, 2015, 05:23:03 PM
You can also buy blade tips for certain soldering irons (not sure if Hakko does one).

Remove the whole pot with blade tip and then desolder the pads as per usual.

That's a good suggestion and probably MUCH cheaper.

You really only need one blade to do it.  The dual blade tweezers are nice to have for removing ICs, but not as important for pots.
Title: Re: PCB mounted pots/switches/LED's
Post by: juansolo on January 08, 2015, 07:49:03 PM
Quote from: raulduke on January 08, 2015, 12:57:47 PM
The other thing that can make life easier (and cheaper) is to use normal pots (ie. with solder lug) as PCB mounted pots.

Solder some solid core wire legs on to each lug contact, and voila, you have a PCB mount pot.

This is how I do it anyhow (PCB mount alpha pots are quite expensive to get hold of in UK).

Other little tips I use:

* Add some sticky foam insulation behind the pots to prevent shorts. This will also give a little 'wriggle room' for fitting the pots.

* If desoldering the full pot is fiddly, then its easy to just snip of the pot and remove the wire legs individually from the PCB.

* If even more wriggle room is needed,  drill mounting holes on enclosures an little bit larger (ie. 7.5mm rather than 7mm). Use locking washer internally to fix the pots solidly when mounted.


^all of this. Also with solid core wire you're also not limited to the layout the PCB maker likes. See just about all of my builds for examples of that ;)
Title: Re: PCB mounted pots/switches/LED's
Post by: pickdropper on January 08, 2015, 09:49:58 PM
Quote from: juansolo on January 08, 2015, 07:49:03 PM
Quote from: raulduke on January 08, 2015, 12:57:47 PM
The other thing that can make life easier (and cheaper) is to use normal pots (ie. with solder lug) as PCB mounted pots.

Solder some solid core wire legs on to each lug contact, and voila, you have a PCB mount pot.

This is how I do it anyhow (PCB mount alpha pots are quite expensive to get hold of in UK).

Other little tips I use:

* Add some sticky foam insulation behind the pots to prevent shorts. This will also give a little 'wriggle room' for fitting the pots.

* If desoldering the full pot is fiddly, then its easy to just snip of the pot and remove the wire legs individually from the PCB.

* If even more wriggle room is needed,  drill mounting holes on enclosures an little bit larger (ie. 7.5mm rather than 7mm). Use locking washer internally to fix the pots solidly when mounted.


^all of this. Also with solid core wire you're also not limited to the layout the PCB maker likes. See just about all of my builds for examples of that ;)

The only thing with solid core is that you want to have a good idea of how the wire routing is going to go before you stuff it as you don't want to cause metal fatigue in the wire by reworking it a lot.  I know you already do this Juan,  but it's important to know if you've never used solid core wire before.
Title: Re: PCB mounted pots/switches/LED's
Post by: juansolo on January 08, 2015, 11:16:20 PM
You learn quick with solid core how to deal with it ;) But it's worth getting over the initial inevitable breakages because of what it can offer once you become one with it. You also learn quick to make your builds VERY sturdy because of it too (and as a result of it).

I love the stuff.
Title: Re: PCB mounted pots/switches/LED's
Post by: davent on January 09, 2015, 12:30:23 AM
Guess i'm the other outlier here. I like doing layouts and etching/drilling boards. Soldering up stuff since the 80's i did my first commercially-produced-pcb pedal a month ago and didn't use the board mounted pot layout but did do as Juan does and other's have suggested using the flying solid core. To me board mounted pots and switches are just a layout constriction i don't need or want to deal with that seem to, more often then not, lead to a control layout that i don't find in any way aesthetically pleasing so why bother? I put standoffs in to hold boards so don't need the pots for that function. The control layout for the enclosure stays in flux until the holes are drilled, to go back and forth between pcb revision to accomodate enclosure revision, nah. I'm content with having my electrons travelling through a net of rainbow sheathed copper.

Now I do have a few commercial boards of high, pcb-mounted-controller count i will get to someday. For the most part they aesthically please, only minmal changes planned so far.
Having fun...
dave