Hey everyone,
I threw together a really cheap and simple mic preamp board so I can plug dynamic microphones into my guitar pedals and amps. It works great, and doesn't sound half bad either. It requires a bi-polar supply, and I've been using a charge pump to achieve that (I have charge pump boards as well).
If this is against the rules please let me know. I'll happily take down the post if this ruffles any feathers. Boards are for sale here:
https://www.tindie.com/stores/lileffects/