DPDT switch with relay bypass board

[Katt]

Hi guys! I've been doing a little bit of research into some pedals I'd like to recreate and a lot of them feature a DPDT switch with a relay¹.
But I can't find a board like this online - it's ideally how I'd like to bypass my pedals - does anyone have info or knowledge of these switching methods?

¹http://i.imgur.com/ZN9CXFD.jpg Crowther Hotcake,
https://media.discordapp.net/attachments/367304126997987329/414999216000073729/Graphic3.png?width=693&height=676 Frantone Cream-Puff board,
https://filisteudorock.files.wordpress.com/2011/02/dsc05394-c.jpg Frantone board (back)

What I do know is that the Frantone switching method uses a 470uF capacitor and a 5v(?) DPDT relay with the DPDT footswitch. Fairly sure the Hotcake would use the same.
Thanks x

Edit: seems MXR uses a switching DPDT method but perhaps with a Millennium(transistor) bypass?

[Aph]

Hi Katt,
I'm old school. I only encountered relays in guitar pedals if it was going to be used remotely (with a remote switch to turn the effect on/off). I didn't realize there was a trend for relays in boutique pedals because of their "superiority".
So, I read this: https://www.vertexeffects.com/blog/vertex_true_bypass_mechanical_relay

And, I agree with them. I don't think it's worth it. (except for stereo effects?)
Of course, if you still want to go that route, I'm sure someone here has a schematic. And I'll look around, too. 

[Katt]

I'm old school.

Fran's one of the OG builders! She's been using that relay design since the mid 90's.

The relay method seems to be more reliable (I've had 3PDT switches break fairly easily before) and shouldn't really affect my costs, so I'd definitely still be interested in any info that can be dug up.
Thanks a lot for that article though, it was very informative and well laid out.
Thanks

[samhay]

If you are happy to use a non-latching relay and a latching DPDT then the circuit is trivial - switch voltage to the relay coil.

If you want to save a little current and use a latching coil, it gets more complicated:
http://sound.whsites.net/articles/relays.htm

[Aph]

If you want to save a little current and use a latching coil, it gets more complicated:
http://sound.whsites.net/articles/relays.htm

Yes, of course...
Rod Elliott's whole site is unbelievable!

[Katt]

I actually asked Fran myself, and here's her answer.

These days I do use a 3PDT switch, but Frantone pedals were the first 9v battery operated effects to have true bypass with indicator back before that type of switch was made.  I did it with the relay, and it actually is quieter for audio switching.

The more you know.

[mfunky]

And I heard that non latching relays tend to produce less popping noise than latching ones.