Re: simple 150uA constant current supply




I would like to find the simplest way to provide a constant current of around 150uA (+/-20%) at around 2V.
This needs to be discrete components rather than IC and should not involve pulse width modulation.
The simplest form I thought of was a 3v voltage reg with a 20K resistor between it's 'reference ground' and the output but this seems clumsy.

Does "at around 2V" mean your available supply is 2V or that the maximum voltage developed across the load by the 150uA is 2V, or both?

.



Relevant Pages

  • Re: simple 150uA constant current supply
    ... This needs to be discrete components rather than IC and should not involve ... pulse width modulation. ... The simplest form I thought of was a 3v voltage reg with a 20K resistor ...
    (sci.electronics.design)
  • Re: simple 150uA constant current supply
    ... pulse width modulation. ... The simplest form I thought of was a 3v voltage reg ... Which is an IC and is excluded by your "needs to be discrete" requirement. ...
    (sci.electronics.design)
  • Re: simple 150uA constant current supply
    ... This needs to be discrete components rather than IC and should not involve pulse width modulation. ... The simplest form I thought of was a 3v voltage reg with a 20K resistor between it's 'reference ground' and the output but this seems clumsy. ...
    (sci.electronics.design)
  • Re: simple 150uA constant current supply
    ... This needs to be discrete components rather than IC and should not involve pulse width modulation. ... The simplest form I thought of was a 3v voltage reg with a 20K resistor between it's 'reference ground' and the output but this seems clumsy. ...
    (sci.electronics.design)
  • Re: simple 150uA constant current supply
    ... pulse width modulation. ... The simplest form I thought of was a 3v voltage reg ... Which is an IC and is excluded by your "needs to be discrete" requirement. ...
    (sci.electronics.design)