Hi Ted once more. I want to rack the MQ1. It is working already, just needed some solder and tlc. What would be a correct external power supply for it. I see in the schematics 12 volt unreg., but a PC power supply is regulated, so i´m confused. Does the MQ1 regulate onboard? Could i use an unregulated 12VDC 1Amp psu? Would 1 amp be sufficient? Thank you for your time and attention. Hugo.