You should look for either a charge pump(SwitchingRegulators) or DC-DC converter.
DC-DC converter are costly.
A good start could be a look at National semiconductor web site for SwitchingRegulators (step-up) .
www.national.com.
you can also search Digikey site
DC-DC converter are costly.
A good start could be a look at National semiconductor web site for SwitchingRegulators (step-up) .
www.national.com.
you can also search Digikey site
here's a lot of info on phantom power:
http://www.hut.fi/Misc/Electronics/circuits/microphone_powering.html
if you have a wall-wart which delivers AC you can use a voltage multiplier (tripler, quadrupler, whatever) -- this will be quieter than a switcher -- you can regulate 48V with a LM317HV or a TL783 (which will go to 125V)
http://www.hut.fi/Misc/Electronics/circuits/microphone_powering.html
if you have a wall-wart which delivers AC you can use a voltage multiplier (tripler, quadrupler, whatever) -- this will be quieter than a switcher -- you can regulate 48V with a LM317HV or a TL783 (which will go to 125V)
5 batteries is an option, but since the microphone only needs 2 ma of current at 48V I thought that if the circut is not very complex, it could end up being more compact that a set of 5 batteries.
Weight is another problem. This microphone feeds a camcorder in a Steady cam mount, so weight is of outmost concern.
cheers
Ric
PD: tks for the links, folks.
Weight is another problem. This microphone feeds a camcorder in a Steady cam mount, so weight is of outmost concern.
cheers
Ric
PD: tks for the links, folks.
Re: One approach
Tks for the data. I never used such that chip. I downloaded the PDF and it suggests this:
"The MAX1771 drives an external N-channel MOSFET switch, allowing it to power loads up to 24W. If less power is required, use the MAX756/MAX757 or MAX761/MAX762 step-up switching regulators with on-board MOSFETs"
Which I thing is better because is more compact and I need a few MA anyway. But I can not find any reference that points at using these chips in a 48V output configuration. Any ideas?
tks, Ric
thespeakerguy said:use a MAX1771. It's not the latest/greatest, but will work, has a free sample, and come in an 8-pin DIP package.
Tks for the data. I never used such that chip. I downloaded the PDF and it suggests this:
"The MAX1771 drives an external N-channel MOSFET switch, allowing it to power loads up to 24W. If less power is required, use the MAX756/MAX757 or MAX761/MAX762 step-up switching regulators with on-board MOSFETs"
Which I thing is better because is more compact and I need a few MA anyway. But I can not find any reference that points at using these chips in a 48V output configuration. Any ideas?
tks, Ric
head over to national at
www.national.com
use the webbench power tool and input ur requirements...it will come up with a nice schematic and simulation for whatever you want...takes just a few mins...I'll recommend the LM2587...
www.national.com
use the webbench power tool and input ur requirements...it will come up with a nice schematic and simulation for whatever you want...takes just a few mins...I'll recommend the LM2587...
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