I also try to train phonemes, but creating good cards for it proved to be hard.
Instead of phonemes in isolation, it should work to train on them in words as minimal pairs. For example, to train the difference between /b/ and /d/ you would test discrimination between /bog/ and /dog/, /cab/ and /cad/, /cabby/ and /caddy/, etc.
Instead of phonemes in isolation, it should work to train on them in words as minimal pairs. For example, to train the difference between /b/ and /d/ you would test discrimination between /bog/ and /dog/, /cab/ and /cad/, /cabby/ and /caddy/, etc.