cool reverb apart from switch spdt 'pop' issue

[deadastronaut]

cheers sam, your a star man.,  i'll bread this up today after a few of mrs astro's chores

and try it out ...so the led on the fet will be the on/off led...cool.

back later..

[slacker]

Transplant those. 2 resistors and switching from the schemo a few posts back..?...thats it?

Yep, that's it, don't forget the extra cap before the resistors.

[deadastronaut]

ahhh i'm lost..


this... :1

http://www.diystompboxes.com/smfforum/index.php?topic=101126.msg937874#msg937874

...

or this...with this.. :2

http://www.diystompboxes.com/smfforum/index.php?topic=101126.msg938031#msg938031

http://www.diystompboxes.com/smfforum/index.php?topic=101126.msg938146#msg938146






i was going with this schemo as i have a verified pcb layout of this schemo that i could just tweak a little...
http://www.diystompboxes.com/smfforum/index.php?topic=101126.msg938023#msg938023

[samhay]

The switching scheme I posted should work for any pedal that uses a buffered bypass and a FET switch (pulled high) to turn on the effect.
If I have not misremembered, and have drawn it correctly, I used this to do a tails/bypass switch on Merlin's Small Time delay. It should work on the schem that Marc posted - http://www.diystompboxes.com/smfforum/index.php?topic=101126.msg938031#msg938031

I should probably point out that this does not ground the effect input or output in bypass. This shouldn't be a problem with these effects, but you may wish to check.

Oh, and yes - you use the LED off the FET switch as your indicator.

[slacker]

Apologies if I've caused any confusion. I would either go with option 2, the Marc and Sam collaboration.
Or take my mods from option 1 and splice them into into your schematic below.

i was going with this schemo as i have a verified pcb....
http://www.diystompboxes.com/smfforum/index.php?topic=101126.msg938023#msg938023

Either one does the same thing, the choice is yours, as they say.

[samhay]

Just to muddy the water a little more. Ian's approach is nice, as it doesn't use any more active components. You could splice this into your existing PCB in the same way...

[deadastronaut]

no apologies needed...its my brain not yours..

so like this ..(ians switching)...should there be a cap before the 4.7k's?.

[slacker]

Yeah, I would put a cap before the 4k7s. It will probably work without a cap but will likely pop like crazy.

[samhay]

... and you would be back to a 'cool reverb apart from switch spdt 'pop' issue'

[slacker]

Ha ha

[deadastronaut]

Lol... Pop pickers,..

[Mbas974]

Great project !

whether the pop issue is still there... an idea is to implement the switch as per Pinnacle Deluxe boost switch (jfet switch with bipolar cap).
Hope to try it soon and let you know.

byeee

[deadastronaut]

okey dokey...i re-jigged my layout according to mods....looks right to my eyes?.

pink cap value?...

[slacker]

Pink cap wants to be big enough to not interfere with any tone shaping the 10k(2 x 4.7k)  22n cap combo are bringing to the party. Try 100n or bigger.

[deadastronaut]

cheers ian, i'll socket that cap then.

[samhay]

When not bypassed, the pink cap is in series with the 22n cap on the other side of the two 4k7 resistors. You may want to make this bigger too...

[deadastronaut]

ok, cheers  sam, i'll socket them both then..

etching the pcb now..(couldn't be arsed with breadboarding it up again..

[samhay]

If you like how it sounds now, then try both caps at 47n.

[deadastronaut]

yeah i love how it sounds now...okey dokey....think i'll socket em just to mess with anyway..

pcb etched...drilling.

[samhay]

You have a ~700 Hz HPF into the reverb (22n/10k) as per the data sheet. 2 x 47n and 2 x 4.7k will get you essentially the same.