True Bypass with Latching Relays

[Fael]

I would like to know if there is a schematic or, preferably, a perfboard, veroboard, or PCB design for a latching relay based true bypass on a pedal.

There are some schematics for non-latching relays like R.G. Keen's: http://www.geofex.com/FX_images/relay%20true%20bypass%20with%20Boss-Ibanez.gif
More info about this particular schematic here: http://www.diystompboxes.com/smfforum/index.php?topic=86288.0

However, I also found this diagram: http://www.geofex.com/FX_images/relays2.gif
It does not specify if it's designed for latching or non-latching relays. Moreover, and given the other circuits I've seen, it seems way to simple to work. It would be awesome if it worked for individual pedals.

So far, the only latching relay design I've seen is this one: http://www.fredric.co.uk/
However, it is for a two coil relay. Unfortunately, only a one coil DPDT relay is available in my third world country (where, ironically, a lot of electronics are made, exported and then imported again).
Would you please explain to me what I have to do to apply this design to a one coil relay?


To sum up:
1.- Have you seen any latching relay based true bypass schematics/perfbord layout/verboard layout/PCB?
2.- Would you tell me how to modify the design (http://www.fredric.co.uk/) to apply it to a one coiled relay?

[Processaurus]

I've breadboarded this dual coil one successfully.  Also, I noticed today that small bear carries the NEC dual coil 5v latching relay mentioned.  Single coil is apparently more complicated and more temperamental to get going.

http://www.diystompboxes.com/smfforum/index.php?topic=82010.0

Is it battery powered?  Otherwise a non-latching relay is way easier.

[PRR]

> only a one coil DPDT relay is available

What is the exact part number? (It is hard to design a saddle until you know if the horse is small or large or really a camel.)

[Eb7+9]

http://www.youtube.com/watch?v=MK_OCcDBzOM

[Eb7+9]

simple, non-temperamental, and battery friendly ... nuff said

[Galego]

I've made a pedal with 2 effects, switched on and off with two microswitches, connected to a dual J/K Flip-flop and using two relays.



74HC109 dual J/K and BC547 transistors.

I'm not sure it's done properly, because i'm a noob, but it works.

Hmm, i've just noticed, the wires at the output jack are wrong, ignore that lol.

[Fael]

Thank you for all the helpful replies. However, I feel inclined to tell you that I am no longer interested on relay based true bypass. I'm know fretting over Tonegod's wicked switches.

For anyone interested: http://www.diystompboxes.com/smfforum/index.php?topic=86949.0