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I finished building my Blues Buster yesterday and noticed I have to crank the volume to get unity and also there isn’t a lot of gain. I know this pedal isn’t supposed to be gain heavy but I think it should have more than it does. I didn’t have a 15nf cap to go in C4 so I used a 18nf instead. Will this have that much of an affect or not. I don’t have any pics yet but can get some if needed. I did measure every component before putting them in so I’m sure they are correct.
Here is a pic. I left C4 long so I can change if needed
R13 looks like a 6K8 instead of 1M that would allow more signal to go to ground
Not sure looking at the build doc I’ve got it’s 1M on the schematic and BOM but double checked I had the most up to date and the second one does show 6K8 in the BOM
It is a 6K8, that is what the build doc calls for. I went by the build doc instead of the schematics apparently. I’ll change that and see what happens. Thanks
You were correct. I went ahead and changed it and the volume is all good now. My print out was very faded so I went by the component list. After pulling it back up, the schematic says 1M. Thanks for looking at it Billy.
Not related to the level issue, but – check the polarity positioning of D2 – the flat side appears to be reversed. (Unless that is intentional.)
The cathode side is to the stripe, right? It may be hard to tell in the pic
I can never ‘remember’ cathode/anode’ – rather, I use an LEDs ‘flat’ side (or a diode’s stripe) and match it up with the PCB silkscreen. There are some occasions where I will use a datasheet to ensure correct orientation while carefully comparing the schematic to the PCB traces. It’s so easy to trip up on little details.
Just today I discovered that I had inserted one of the MOSFET clipping devices in an Anxiety Disorder Drive backwards and while the pedal still worked, the distortion harmonics were way off. Once I saw what I had done and corrected it, (had to cut the old one out and replace it – lesson re-learned: use sockets for active components), the pedal would sit up and bark nicely as an OCD circuit ought.
In any case, you may be correct in that photo does not properly expose the ‘flat’ of the LED in the D2 position. Nice work. And glad you got the level issue resolved.
Flat side to the stripe. I went back and checked it again. Also I found a 15nf cap and put that in. That got the overdrive working properly. All in all I would say this is a really good pedal for the thing that it does. Thanks
I am glad you got this sorted out.
Just when you think you have covered every possibility of a typo one shows up. Moreover this typo has been stagnate for a very, very long time. Most likely to people using the schematic however I feel I need to point out that I need to know if there is such a typo for me to fix it.
So while this caused you an issue up front I appreciate you using the forum and finding a resolution and now that I know there is a typo it has been fixed so your trouble will ultimately save others from that experience.
Thanks.
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