Partial tested midi interface.
Schematics based on https://groups.google.com/forum/#!topic/comp.sys.cbm/bPifzgUwfro
with 8k rom socket ($8000-9FFF).
To use rom, close JP1 and JP2
design partial tested
Rom found and running, midi detected by cynthcart v2.0
(note, running cynthcard V2.0 from 8k rom needs some crunching and relocation routine in rom as well)
Midi part not tested (I don't have midi...
One channel of a moving magnet phono cartridge preamp with very accurate conformance to the RIAA qualisation curve, based on the design shown in Fig 16 of:
but with the addition of R10 and C8 to remove severe HF peaking in V(BUF) at >100kHz due to capacitive loading of U1 by the input of the bandpass filter implemented by U3.
Fork the projec...