/diy/ - Do It Yourself

>>2036462
latching relays have two different ON states and two different ways to actuate them. single-coil units are designed to actuate one or the other state according to the polarity of the coil pulse. double-coil units have one coil for each desired state and the user chooses which one to pulse. I recommend a double-coil unit, so that you can simply duplicate the existing coil driver. you will need to repurpose an existing pin, perhaps by removing the muting circuit or the muting jumper and the associated code. you will also not be able to determine the existing state of the bypass unless you somehow monitor the state of the contacts or record each coil pulse to EEPROM, so pulsing on power up is your best option. RIP if your battery dies mid-performance and you can't even play clean

>>2036500
the integrated product would be expensive. that's four dice in the package now, and the wiring and lead frame get more complicated. I mean all you really need is the 5 cent op amp, one resistor to set gain and a $3 dual-photodiode matched opto like LOC110, which also happens to be fast (-3dB near 32kHz) and linear (80ppm). imagine the studio and stage applications

>>2036514
it's been a while since I tried to read a chip, but I think it's like pic. honestly not sure what's going down on the PMOS side

>>2036539
I wouldn't measure an L in a power supply application in-circuit, as it could pump energy through a diode into the Vcc bus and the rest of your circuit becomes an L
>105
does 10x10^5 nanohenries (1mH) sound reasonable for an input filter in that low-current, high-noise situation? it sounds reasonable to me. that looks like a standard SMT inductor base from the olden days, measure it with calipers and see if digikey has the size in their selector list