Hi everyone.
I would like to use an arduino nano to replace the pickup selector of an electric guitar. I would like to act on a button to change the combination of pickups.
My doubt is that technology to use to avoid interference and bump.
In your opinion, can I use small solid state relays to guarantee insulation?
Do you have any suggestions on which technology to use to replace the switch and that can adapt to the low voltages of the electric guitar circuit without interfering?
Thanks a lot,
There is little processing demand here - given that you would need to power the Arduino from somewhere and noise from the processor may get picked up, why not just use a switch setup ( eg rotary) to give you any complex combinations you need.
Hi maddmax76,
try this SSD Bus switch. They use 5V low noise bus switches. its pretty much the same like a normal relay but much smaller and can be triggered by TTL level directly from the MCU pins. Only downside, its pretty small and hard to solder wires to it. i used breakoutboards and soldered the on these first.
BTW with these you can still use the standard switch and feed it with 5V and a few pullup resistors. you wont even need a mcu for that.
hammy:
There is little processing demand here - given that you would need to power the Arduino from somewhere and noise from the processor may get picked up, why not just use a switch setup ( eg rotary) to give you any complex combinations you need.
For the power supply of the Arduino I can insert a battery or a separate power supply, what interests me is to understand how to interrupt the circuit that goes from the amplifier to the pickup without bothering the sound.
Could I drive a transistor or analogue switch like the CD4066B?
The problem is the signal that I have to deal with, we are talking about alternating current with peaks of 90mV.
I'm afraid that with a transistor I can not handle the alternating current or that the current that passes when the transistor is in "open" state is enough to excite the preamplifier.....
P.S. it's just the rotary or linear switc that I want to get rid of!
Guentec:
Hi maddmax76,try this SSD Bus switch. They use 5V low noise bus switches. its pretty much the same like a normal relay but much smaller and can be triggered by TTL level directly from the MCU pins. Only downside, its pretty small and hard to solder wires to it. i used breakoutboards and soldered the on these first.
BTW with these you can still use the standard switch and feed it with 5V and a few pullup resistors. you wont even need a mcu for that.
I need some more information when you say that: "BTW with these you can still use the standard switch and feed it with 5V and a few pullup resistors. you wont even need a mcu for that".
...After having soldered the micro usb socket of the charger on my mobile phone nothing scares me anymore! 
Nice work the video switch!
I'm looking at the datasheet of the CBT3244A, I think only accept positive input voltages, I'll probably cut the signal of the pickup when it becomes negative ....
For low-level signals like guitar pickups, I think a small reed relay might be a good choice. They cost about $1.30 each from DigiKey.com. Get a unit with a 5V 10 mA coil and you can drive it directly from an Arduino pin.
Nice idea, thanks!
It resumes that of the solid state relays I had in mind. I have identified this, Arduino should be able to drive it directly according to your directions:
as I understand the central pins are the coil to be excited to short-circuit the external pins, right?
I put one for each pikup and program the arduino to activate or deactivate the relays at will, depending on the combinations I want.