I'm putting together some layouts and such that aren't around at the moment and I have a question...

Right now I'm in the middle of the Korg CMP-1 Compressor layout, and it has "somewhat" of a true bypass with LED built into it. The question is, should I leave this out for simplicity's sake and just get to the meat n potatoes of the thing?

Also, I'm going to be going headlong into the Korg Flanger when I get this layed out, built and working. I was going to do the Ross Flanger, but it's so damn complex, it's hard to figure out without a schematic...

Wish me luck!

Good luck,we need all the goodies we can get,more toys more toys!!!!.
Aharon

I vote for meat and potatoes. I think at this point, 3PDT switches are so easy to come by that pretty much any pedal can be built with them, so I would skip the bypass circuitry and just make the effect itself.

While you're at it...the Korg Hard Dist is a pretty chunky box!

Roger

I did a mod on mine that some might be interested in. I wired up the LED as a sort of crude "compression amount" indicator. Just hook up the unused half of the 4558 as a unity-gain non-inverting buffer (jumper output to - input), connect the + input to the base of Q4, and the output through the stompswitch to the LED and its dropping resistor. You'll also have to jumper out the zener diode in the LED circuit. Now the LED only comes on when the pedal is actually compressing.

OK, got it layed out, I'll get a board etched tomorrow and see if it all comes out ok. I eliminated the LED/bypass and will be using the millenium and dpdt instead.

OK, color me stupid, but it's been a long time since I seen a schematic like this, but on the CMP-1 schematic, I have both the "fork" looking ground symbols and an arrow symbol... am I to assume the arrows all connect to a trace that has something like 4.5v? and secondly, the 4558 on this thing seems to have no supply voltage going to it... is this normal? All that is shown on the schematic is pins 1,2 and 3 connected. Any help would be appreciated cuz i don't wanna waste my time etching a useless board... :roll:

Not necesarilly,is the effect powered by a wall wart?.
Usually the forks are mains ground and the arrow is circuit ground,if it were 4.5V or similar it would say Vr (voltage reference or the like).
I also guess the power to the 4558 is assumed.
Aharon