I've been seriously considering building a linux-based effects processor using a single board computer running linux/guitarix. I think I've decided on using an Udoo Quad since it hopefully has enough processing power, and with the onboard AC97 codec I won't have to deal with ADC/DAC's or USB sound which tends to have a higher buffer size than I'd like.
My idea is to have everything in a small console with a touch screen, and run JACK/guitarix with the html host for a simple display. There may be enough processing power to also run an audio recorder or do something with a looper or other fx software.
I'll use 1/4" inputs and outputs for guitar (or electric mandolin) in/line out, bring in mains power and have an onboard +12v power supply module, and have three switches: one for power, one for input gain selection (unity or gain of 2), and one for selecting whether to use a 1:1 transformer to isolate any ground loops on the output.
Opamps will be used for input and output to buffer (and optionally provide gain in the case of the input). Important since the guitar pickups have a high impedance, and may not be necessary on the output, but it couldn't hurt.
Anyway, I've attached a schematic of the circuitry (post 12v module). Anyone care to tell me if I've been careless somewhere? I can usually read a datasheet, but I'm still a bit of a n00b.
My idea is to have everything in a small console with a touch screen, and run JACK/guitarix with the html host for a simple display. There may be enough processing power to also run an audio recorder or do something with a looper or other fx software.
I'll use 1/4" inputs and outputs for guitar (or electric mandolin) in/line out, bring in mains power and have an onboard +12v power supply module, and have three switches: one for power, one for input gain selection (unity or gain of 2), and one for selecting whether to use a 1:1 transformer to isolate any ground loops on the output.
Opamps will be used for input and output to buffer (and optionally provide gain in the case of the input). Important since the guitar pickups have a high impedance, and may not be necessary on the output, but it couldn't hurt.
Anyway, I've attached a schematic of the circuitry (post 12v module). Anyone care to tell me if I've been careless somewhere? I can usually read a datasheet, but I'm still a bit of a n00b.