The pcb holds two mic preamps on one board (can be seperated if necessary). The circuit is based on the THAT1512 for amplification and a THAT1646 output section. Additionally, a DC servo is used so there is no other capacitor in the direct signal path other than the phantom blocking cap. It also Features relay switched input pad and output polarity reversal. Overall, a very clean and clear sounding mic preamp.
10€ each, I have five pieces available. For 6€ I also have an appropriate power supply pcb that will feed several of these boards.