Split a 0-300V 50mA supply into 50mA and 50µA parallel branches

[juzzy]

I have a variable voltage constant current power supply 0-300v at 50mA. Is it possible and if so what would be the simplest way to have a parallel circuit with 0-300v 50mA on one side and 0-300v 50uA on the other? A simple resistor isn't going to work because the supply maintains 50mA. Any help would be appreciated

 

[meBigGuy]

Build a 0-300V 50uA constant current regulator. The main supply will just sit at 300V trying to drive 50ma.

There is no way that occurs to me to do it without active components. It only needs to dissipate 15mW when shorted and the input is 300V.

berkeman's post from another thread: https://www.physicsforums.com/threads/simple-current-limiter-for-ltspice.833264/

 

[juzzy]

Build a 0-300V 50uA constant current regulator. The main supply will just sit at 300V trying to drive 50ma.

There is no way that occurs to me to do it without active components. It only needs to dissipate 15mW when shorted and the input is 300V.

berkeman's post from another thread: https://www.physicsforums.com/threads/simple-current-limiter-for-ltspice.833264/

...and so is worth pursuing. Thank you very much. your help is much appreciated. It will save me having to purchase another power supply.