Aternating LED indicator Circuit

[Scott Swartz]

I just finished a switcher box and used this circuit, which is an extension of the Millenium bypass, to alternate between 2 LEDs.

Had to dig out this image to remember how I had done this in the past, so I figured I'd post it since it goes back 5 years.

Credit for design goes to RG Keen, I emailed him asking about how to do something like this and he replied back with a design concept that I tried and it worked perfectly, so I drew it up.

[snoof]

good lord man, that's HUGE!

[CGDARK]

good lord man, that's HUGE!

I think is the biggest schematic posted here. Am I wrong?

CG

[dxm1]

Sorry for dredging up an old thread, but I have a similar switching problem. I'm trying to put together a box with three loops and a buffer. I'd like the buffer to be (besides bypassable) able to be placed either at the beginning or end of the signal chain.

Using an available (but spendy) 4PDT mini-toggle, I can get the circuit to fly. Unfortunately, I'm out of switch contacts to handle status LEDs. I figured the Millenuim Bypass would come to the rescue again. My problem is finding the right place to connect the control signals to the MB2 circuits.

This is the circuit as it stands now, with the control signals for the status LEDs in the lower right, shown as ports "PRE" and "POST".



I'd thought of using the circuit described in this thread, since it seems to be just what I need, but have been unable to get it to work on the breadboard.

Any help would make a prospective Christmas Gift recepient very happy...

[MarcoMike]

I've been quite busy with before/after/series/parallel combinations of effects lately, you don't deserve a 4pdt switch for the before/after combination, a 3pdt is enough. and the 4th pole may be used for the LEDs. also a rotary switch may work here, but I have to think about it a little more and now it's time to go... try to figure it out yourself (just for fun), tonite I'm gonna draw  a schematic for it.

Marco

[MarcoMike]

ok, here I am. with a rotary switch (4poles,3positions) you can even include the buffer on/of switch and leds
here is the idea:


pos1 buffer off, direct to the looper, LED if you wish
pos2 buffer pre led1
pos3 buffer post led2

leds are not shown but you can figure it out using the fourth pole of the switch...

[dxm1]

Thanks Marco.

Good idea using a rotary. I tried RG's circuit again on the breadboard, and subbing the 22K resistor with a pot, finally got it to work. It seems like the LEDs I'm using prefer a 3K3 in this position. Now, to find a suitable spot for the control wire...