Friday, August 24, 2007
Quick Voltage Amp
If you need a quick voltage amp for some project requiring a lot of gain and transformer output, a quick and easy way to go is to use the input of a typical low cost solid state condenser microphone, which has a high gain amp in it, behind a super low noise amp, like this one shown here from Miteq. The DC bias at the input must be blocked by a cap, and shielded by the stock headgrille. Use an isolated BNC connector. A regular BNC will bring in a ton of noise.
This mic was about $45, yet the low noise 50 db amp cost at least $400. Together they will produce over 100 db of gain, not without noise, but OK for non critical applications.
I used this one on a "fly's wing" transducer with a piezoelectric base. You can read about that here.
Posted by Bob Crowley at 1:18 PM