Recent content by thunderaxe

my mistake, i didn't even check the resistor designations before answering. my answer refers to R2 in the cliche buffer. R1 in chuck's diagram is a different story because it uses a transistor, not an op amp, and i still don't understand transistor circuits well enough to answer that question.

it protects the op amp input from excess current. pretty much every circuit that has a non-inverting op amp up front will have a resistor in front of it. it's 1K in the RAT for instance, and 10K in the DOD 250 / MXR D+.

will any N-channel MOSFET work for the ground switch, or are there specific specs i should be looking for?

i have a couple of basic questions to help me understand the circuit and make sure i've wired it up correctly and not backwards (i.e. LED turns on in bypass mode) -- the datasheets show the positions of the switches in "energized" and "non-energized" states for the coil which is connected to...

should i have any series resistor for the relay power, or just skip it entirely? and are 100u+100n the right filtering caps for the relay?

okay, here is my full circuit for my input-output and switching board. it has input, output, DC jack, power conditioning, LED and switching on one board, gives the option of true or buffered bypass, grounds the pedal input in bypass mode and bypass buffer in true bypass mode, and leaves the...

i'd like to know more about your approach to using JST connectors. it's also what i'd like to do, but i'm worried that stacking the boards directly with pin-to-socket connectors might put too much mechanical strain on the boards and i'd rather have them connected by a ribbon cable, but without...

would this apply to any manufacturer's capacitor of the same specs and package? or just murata's?

i remember reading about that on electric druid's page about designing a tubescreamer-style overdrive pedal, but re-reading it now all it really says is that the FET switches need isolating from the outside world. doesn't go into details. i think the little SPDT diagrams on the CD4053 circuit i...

is this not true bypass with a CD4053?

also, i'm sure this has been covered extensively elsewhere (so please feel free to just drop a link), but what is the advantage of using a relay over, say, a CD4053?

i'm guessing there isn't an equivalent of a CD40106 with less inverters in it in a smaller package? say, a 3x in a DIP-8 or even a dual in a DIP-6?

Well that seems a lot simpler than the other CMOS+MOSFET circuits posted or referenced by lowpitch. what is the purpose of the other MOSFETs and BJT on those designs and why aren't they needed for this one?

what are the advantages of this over the 555 relay circuit?

where can i find that?