> the board for SlowBlow's mic pre
You have heater current flowing through signal grounds, right? Very naughty.
> planned PSU for the mic pre's B+ rail;
I sure hope there is a power transformer in there. It looks like a hot-chassis power supply, which is deadly. But given a power transformer, why not use a 230V winding and a plain bridge rectifier?
You have heater current flowing through signal grounds, right? Very naughty.
> planned PSU for the mic pre's B+ rail;
I sure hope there is a power transformer in there. It looks like a hot-chassis power supply, which is deadly. But given a power transformer, why not use a 230V winding and a plain bridge rectifier?