tmbg
Well-known member
I mocked up a voltage multiplier loosely based on peterc's scheme found at http://1176neve.tripod.com/id26.html
I'm not sure if there's a better way to calculate this with the simulator, but from (virtually) loading the supply, it seems like preregulated I get roundabout 69V with a thevenin source resistance of ~450ohms.
now, still preregulation, once I've pulled 40mA through it, I'm already down 25V!
I guess my question is, what sort of current demands do I need to design for when building mic pre phantom supplies?
The current supply I have on the sim is regulated with a TIP31 and trimpot to set the bias voltage. Not the most elegant solution I know, and if the load impedance drops, the output voltage drops considerably. I'm simulating it with a 3k3 load, which I imagine would be the same load as one mic with a short in it, and the supply stands up to that ok.
What sort of realistic maximum current demands can I expect for 4 hot condensors operating normally?
I'm not sure if there's a better way to calculate this with the simulator, but from (virtually) loading the supply, it seems like preregulated I get roundabout 69V with a thevenin source resistance of ~450ohms.
now, still preregulation, once I've pulled 40mA through it, I'm already down 25V!
I guess my question is, what sort of current demands do I need to design for when building mic pre phantom supplies?
The current supply I have on the sim is regulated with a TIP31 and trimpot to set the bias voltage. Not the most elegant solution I know, and if the load impedance drops, the output voltage drops considerably. I'm simulating it with a 3k3 load, which I imagine would be the same load as one mic with a short in it, and the supply stands up to that ok.
What sort of realistic maximum current demands can I expect for 4 hot condensors operating normally?