FVerb - a simple reverb/modulation pedal

[DrAlx]

I'd like a second pair of eyes to take a look at the following picture and see that I entered the schematic correctly.

https://1drv.ms/i/s!AvrH61utWEtEh1yQSwtRZmYb4btl

It is not the final layout.
It the the first stage of the layout process in my software (available here https://sourceforge.net/projects/veroroute/)
which involves doing a rough layout based on the schematic and graphically specifying the netlist.

If it all looks OK, then it's just a matter of shifting parts around.  The software will autoroute and checks connectivity against the netlist.
I don't have a footprint editor at the moment, but I don't think it is needed in this case.
I might add a custom 14 x 7 footprint if I think it will allow a smaller layout.

BTW, the BOM on the first page should say 3x 220nF rather than 2  (C8, C12, C16).

If anyone want to download my software the ".vrt" file for the circuit can be downloaded from here ...
https://1drv.ms/u/s!AvrH61utWEtEh1v5UwNkIJCFMwn5


EDIT:  I just spotted a mistake in my picture.  Pins 1 and 2 of the FV-1 should be connected together.  Have corrected it now and changed the images.

[DrAlx]

Here's the resulting perf layout.  It's 18 x 22 although the pics are drawn with a perimeter of 1 perf-hole (so its drawn as 20 x 24).
Note that I have drawn the pots as trim pots.  So you would just connect wires to those spots to offboard pots.
Same applies for the switches.  I just drew two pads for the XTAL connections.  I don't know how big those things are.
I assumed its possible to run jumpers under the converter board.  If not then this layout is no good.

I emulated the converter by drawing on 28 pads surrounding the IC to give this.

https://1drv.ms/i/s!AvrH61utWEtEh2X9MNuLzoSliNrw

With the IC taken out showing just the converter pads, the layout is this.

https://1drv.ms/i/s!AvrH61utWEtEh2Qe8-pPcXkL2vhc


The vrt files are here:  (You can do PCB mask, or vero layout, with just a couple of mouse clicks)

With IC:  https://1drv.ms/u/s!AvrH61utWEtEh2NpcpiYYEvaKq-j
Without IC: https://1drv.ms/u/s!AvrH61utWEtEh2JCKR51VOx16bV-

[printer2]

Ordered my chip, slow boat from China but I can wait.

[gcwills]

Thanks DrAlx for your good work with the layout.
A couple of comments - the adapter board spacing on the perfboard is 7 holes by 14 holes - I assume that is how you have laid it out?
Also, you could include links under the adapter board but there would need to be insulation under the board as there are tracks which could short against the links.

[Kipper4]

His adaptor is the right size already. Hard to see.

Sent from my SM-G920F using Tapatalk

[gcwills]

Thanks for that.
DrAlx, I've checked your layout and I think it is close to verified.

By the way, your layout looks great and tidier than mine. I don't think there is an issue with the three links - a constructor can install them and cover them with some insulation tape before mounting the adapter board.

Hopefully your layout will encourage numbers of builds

[Ice-9]

Thanks Mick. Did you mean 14 x 7
Luckily I have one on the bench.

OOPs, yeah, 14x7 . When buying the soic28 adapters it is always worth a check on the width as I have come across different widths but all the ones I have are 7 wide.

[Kipper4]

I just need to check it again, but I have an 24 x 18 perfboard layout.

I'll be using 14 header pins on the adaptor.
The chip is still not much taller than a short polarised cap.

[gcwills]

That's a great suggestion Kipper and would eliminate any potential shorts on the underside of the adapter board.
I'm in the process of building another FVerb using DrAlx's cool layout to verify it.

[DrAlx]

That's a great suggestion Kipper and would eliminate any potential shorts on the underside of the adapter board.
I'm in the process of building another FVerb using DrAlx's cool layout to verify it.

Sorry, but I just modified the links above The layout is still 18x22 but I got rid of all the underboard jumpers.

[gcwills]

No apologies required! That's even better thanks
Means you can use header pins or my more basic approach of wire links through both boards.

[DrAlx]

I managed to get it down to 17x22 holes.  The zip file has all the images and vrt files...

https://1drv.ms/u/s!AvrH61utWEtEh2jXTG6EGa-DDU7R

[Kipper4]

My layout


post removed for correction Thanks Dr Alx

new links









http://imgur.com/ljSeEye

[DrAlx]

The middle pin of the voltage regulator should be ground.
That made me go and check the pinout on my own layout against the datasheet and I realised my regulator was in back to front.  I've corrected all my above links.

EDIT:  I don't have a 78L33 handy so I originally assumed the pinout would match a 78L12 (which I do have) but the online datasheet for the 78L33 from ST seems to have opposite pinout to that. 
So check the pinout of whatever regulator you use.  Middle pin seems to be ground in both of the TO-92 packages I have seen.

I noticed that Kipper included a 1M anti-pop resistor at the input which is a good idea.  I also noticed that there is no protection diode connecting the input and output of the regulator, so I have added those 2 things to this 16x23 layout here:
https://1drv.ms/i/s!AvrH61utWEtEh3Mcmy6A5zc7-d0R

[gcwills]

Thanks for that DrAlx.I like your earlier 22 X 18 layout and am currently waiting for some parts to build another FVerb using it.
It certainly makes for a simple build in keeping with the simple circuit

[gcwills]

Have just received another FV-1 so thought I'd post some images of the build.
This time I'm using DrAlx's 22 X 18 perf board layout:



Here is the FV-1 mounted on the adapter board:



You can see that the FV-1 can be soldered to the adapter board fairly easily with a fine tipped iron. I tinned the pads on the adapter board first to make the soldering easier. If neighbouring pads are accidentally bridged when soldering, the excess solder can be removed with solder wick or a solder sucker.
I decided to use header pins between the adapter board and the perf board, but you could just use cutoff resistor leads to mount the adapter board.

I'll post some more images as the board is assembled to assist any builders of the FVerb

[gcwills]

Been a bit distracted with other projects
Finally populated the new perfboard with Alex (DrAlx)'s great layout.
A big thanks to Alex for really tidying up the layout making it straightforward to build.
And by the way, as Alex mentioned, the 78L33 is shown backwards in the above layout diag.
Speaking of which, any FVerb builds in the pipeline??

Here is the populated board:



And the board underside:

[Kipper4]

See what I mean about using the header pins for the daptor board?

It will be just about the same height as the caps.

I'll post a pic.

No build yet I'm waiting to see what yours looks like.....

[gcwills]

I agree Kipper, the header pins simplify mounting the adapter board.
BTW, I just noticed that I missed a link on the underside of the perfboard between pins 13 and 16 of the FV-1.

[Kipper4]