Digitization of a signal from a guitar for processing in FPGA. What is the best solution?

Question

Electronics

Actually the task: to digitize (with subsequent processing and transfer to a PC) a signal from an electric guitar.
I know that the tube preamp is an overhead, however: is such a preamp suitable for these tasks?
Tube amplifier on aliexpress or such
(of course, instead of the input I'll let you down with JACK 6mm, output to the ADC)
Actually I'm going to digitize with a similar circuit: ADC0804LCN / NOPB, PDIP20
And who will tell you the connection diagram? Thanks

Answer 1

In this solution, the FPGA is like a hare with syphilis. For audio signal processing, AD's DSP is much better suited. For example, SHARC. But in most cases, you still need a good, suitable ADC.
Further - almost all FPGAs (if used) are powered below 3.3V. The vast majority is 1.8V. This is worth considering, because. for most guitars, the output can reach 5V (this is with passive pickups, by the way). This means that you will need an op-amp like Rail-2-Rail. Or, again, an ADC with separate power supply for the analog and digital parts.
This is so, offhand. Further nuances.
And yes. Regarding the lamp pre. In the case of the guitar, its purpose is to shape the sound. In the case of these Chinese products, the effect will be zero, if not negative. It’s better then to make an ultra-linear and ultra-clean preamplifier (and in the case of ultra-fast FPGAs, also with minimal latency). And all further processing is assigned to the PC. Fortunately, now there are a great many emulators of various "deteriorating" ones. But doing "shit in - shit out" is one way to shoot yourself in the foot.