brazilianwonderboy
Active member
Ok, I've set myself the challenge of building a budget mic preamp that should cost me no more that £40 in parts. The actual preamp itself will be based around an OEP mic input traffo and an LME49710 Op-Amp, there will be phantom power as well. The power supply, however, is the thing that will pose the problems I think.
In past projects I have always built a linear supply based on the Greenpre PSU, but the cost of the transformer will test my budget too much. My intended solution is to get a cheapo 48V SMPS intended for IT equipment (The sort of thing you can get for laptops and that cost a tenner or so).
The question is, is it possible to add any circuitry on the power input of my preamp that will clean up any signal noise that comes from the switching supply? Any ideas will be welcome. Cheers.
Dave
In past projects I have always built a linear supply based on the Greenpre PSU, but the cost of the transformer will test my budget too much. My intended solution is to get a cheapo 48V SMPS intended for IT equipment (The sort of thing you can get for laptops and that cost a tenner or so).
The question is, is it possible to add any circuitry on the power input of my preamp that will clean up any signal noise that comes from the switching supply? Any ideas will be welcome. Cheers.
Dave