Recent content by jdduffield

(The schematic for the circuit I ended up using.)

Pictures on my new boost pedal build.

I’m getting a clicking noise when the switch is pressed. I don’t know if it is a pop due to cap leakage or something else. I’m using true bypass wiring. I’m using 1M pull down resistors. I’ve read that this is great for battery life but not great for capacitor leakage and unwanted noise and that...

So I stuck to the plan and went with an op amp, but another question comes to mind… am I correct in thinking that an op amp will drain a 9v battery much faster than a single transistor?

I need a simple and clear one knob boost for a mandolin. I have a stash of TL071 op amps and wondering if you have a PCB that uses that component in a simple, one-knob boost.

I figured it out. The grounded part of the VREF voltage split was isolated due to a severed copper grounding track. So, instead of 4.5V I was at 7V or higher.

I just built a rat on perf board, but when I test it, I get no sound until I pull the power plug out of the unit. When I pull the power cable out of the pedal, I hear the pedal working beautifully for a second or two. What is a common cause of this?

On mouser they have $6 ones and $2 ones. Do you know the difference and if it is worth stretching for the more expensive ones?

What is the best substitute for the LM308?

Having trouble reading this schematic. What is going on with pin 5 here? (Muroidea circuit) Is it going nowhere?

Yeah, I think I was wrong about the Mic Mechanic not having a preamp. Apparently it does. I got confused because the volume is roughly the same if you bypass it even with a dynamic mic. So, it seems like my effect with need a preamp first within the circuit.

What I envision is a pedal with the left side being delay and the right side being reverb. Then, inside, 2 FV1 chips, one for the delay section that then goes into the second one for the reverb section. I was just wondering about the circuit and how I would handle XLR as it has 3 connecting...

I don't think so. What I want is very similar to the TC Helicon Mic Mechanic. I think it is unity gain without a preamp. I know it doesn’t have a volume knob on it. I suppose I could look at the schematic. With the Mic Mechanic, the preamp stage still happens at the mixing board.

I’m thinking about building a reverb pedal for vocals. (FV1) This means I would be working with XLR instead of 1/4” mono guitar jacks. What are some things I need to consider when designing a circuit with XLR jacks? For example, I imagine I will need to keep power negative and earth separated...