Abyss - no dry signal

[bschobs]

I’m getting no dry signal in my mix. This is the same issue I ran into on my last build (ironically or maybe not) so I’ve checked the TL072 and socket and whatnot. Getting dry signal at R14 and pin 5
of the TL072. Get wet signal all the way through.

Anyone have ideas?

 

[Mcknib]

IC1.2 looks like a non inverting summing amp or mixer

As far as I understand it the two 100Ks R11 and 14 would give you equal wet and dry going in I can't see them to check the values double check they're both 100K

I'd also check the feedback resistor R12

 

[bschobs]

Found my reel of "56k" 1/8w resistors. That's definitely what I put on the board. I'm not the best at reading the color lines but it certainly didn't add up when I tried. So I tested and they are all 12k. Someone in the sweatshop needs a beating for mislabeling these things I've wasted like 45 minutes of time on this!

Kidding aside, I'm going to swap that out and see if that does the trick......

 

[bschobs]

So swapping R12 with an actual 56k didn't seem to do much. In fact now I seem to be getting some crackling coming through on the wet signal when I play with any sort of volume.

R11 and R14 are indeed 100k.

I can hear a signal on pins 1-2-3 / 5-6-7 on the TL072.

 

[Mcknib]

I don't think dry signal likes you haha gotta be something simple it usually always is

Turn intensity completely down and see what you get at pins 5,6 and 7

 

[bschobs]

So I turned the intensity down and still get a good signal at all three of those pins.

Something occurred to me and I feel pretty dumb asking this whether I am right or wrong:

Should the Level serve more as a mix or a volume/boost for the already mixed signal? If I turn the level all the way down and can't hear anything, is that how it's intended to operate?

Per the user manual of the EQD version, unity is around 1 o'clock and that seems to be accurate with what I have here. Once you get to about 11 o'clock volume drops off very rapidly to nothing.

 

[Cucurbitam0schata]

LDRs - I think your LDRs are supposed to face the yellow LED.

Level = Volume - Just finished an Abyss, and my Level works the same way you described. It's a total output volume pot, and turned down there's no signal.

 

[bschobs]

Alrighty then, appreciate the confirmation. As I was typing that last post I kind of had a light bulb go off and realized I was being thick headed.

Dang, I had no idea about the LDRs. Guess I'm not done with this one yet.

Appreciate the assist!

 

[Mcknib]

Level is indeed the output volume, intensity would be the one to increase or decrease the wet effect

Turning it down and still getting a good signal would mean your dry signals ok

Gotta admit level used to throw me especially on delay pedals when I first started using effects hence I always label it mix these days