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No. The switch lets you choose between a range of high mids and low mids. In music speak, a 'Q' control goes from very broad, shelving EQ to very narrow, like a singel position of a wah pedal.

I completed and tested a Maleficent Mids parametric EQ build today. The only change is I substituted an OPA2134 for the NE5532, because it is what I had on hand that was HiFi ish. It is a good pedal. IMHO, it needs a 'Q' control (broad or narrow on the center frequency) and I am going to take...

Sunday bump. Anyone ever build one of these?

No, the problem affects any selection which is supposed to have delay or reverb. I just re-performed the continuity check thru each stage of the diode array, from the +3.3V common pin of the decade selector, to the diodes for that selection and to the pins. I performed the same check reading...

To @Robert or any other FV-1 experts: My first 'DSP' build is almost alive: An Arachnid V2, with a Module 8 and a custom EPROM 24LC32A (both from Pedal PCB). Additional info: FV-1 and 32.768HZ crystal from Amplified Parts. I used static protection, which includes a Spidel ground wrist strap...

I did not have any oscillations. As I originally posted, I found the boost to be only slightly stronger than unity gain and it cuts some low end frequencies. Risk of oscillations is why I use a Cliff jack on the input (limits the chassis to having a single source to ground, the output jack)...

The LED on the face of the pedal are just channel off/on indicator light (red for drive and blue for boost). Yes, the '50w' clipping option on the toggle is supposed to be a red LED by design. I used a red + green pair (internal) for a little asymmetry. The LEDS I have to choose from each...

I just reviewed the datasheet and internal block diagram of the OP07 IC. It does not indicate being internally compensated. I recommend socketing the cap and trying out values to see which you prefer, as well as no cap. I can tell you the no cap will be harsh.

Just finished an Angry Andy for a friend. Never heard the original and was impressed with the sound of this. The boost sounds like a bit of a treble boost in the sweet spot and IMHO, needs a little more dB. However, my friend wanted it built to original specs.

Given the description, I agree with HBC's diagnosis. Sounds like a common component. Check to see if the decade switch is functioning as designed.

To be clear, you have a clean, strong signal when engaged?

I am assuming your builds are all true bypass? You could be overdriving the last stage. Check the pin voltage, ensuring Vref is half of V. This sounds like harsh crossover distortion to me.

CMOS are very sensitive to static short outs from handling. Is your CMOS devices socketed?

I agree with @jimilee . You should be getting plenty of volume. Check all components to the schematic from IC 3.1 to the output jack.

From the picture, it appears your DC socket could be wired wrong. Center negative, sleeve positive. From the pic it appears the red is going to the center pin.

I have encountered a few pedals which the effect is digital, where the effect appears to engage but there is no effect (led lights, EQ of the sound changes a little). Once I caused this in a Mooer Flanger by feeding it 18VDC instead of 9, so I am thinking these FV-1 / DSP / EPROM effects are...

I've built a few and actually did mods to make it sound more like a Soldano SLO 100. I Changed C8 from a 100pF to 220 pF cap, to take out the harsh fizzy high frequencies. I also changed C9 from a 22nF to 18nF to tame he mud. You may want to recheck your component values, as the one's I built...

Great concept for the thread. Sometimes an artist's gear list is available, but it is the stuff they are endorsed for and not what they used on the recording. Often the recorded gear was the studio's or producer's. Then there is microphones and post processing. Having played in moderately...

Lots of good ideas prior to my post, but I am going to share left field similar things which happened to one of my moderate gain drive designs, which uses a charge pump and was on a board with other pedals which did not have a charge pump and did not exhibit the noise: faulty GFI outlets. A...

I've burned out circuit traces on a few of these PCBs when removing parts. I've successfully found them and jumpered them with small bits of wire. A few times I thought about just starting over. The good news is that these PCB projects are built to stay together. The bad news, that makes them...