Re: simple 150uA constant current supply
- From: John Larkin <jjlarkin@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>
- Date: Sun, 30 Mar 2008 13:58:40 -0700
On Sun, 30 Mar 2008 20:49:36 +0100, "Dave" <daveh@xxxxxxxxxxxx> wrote:
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.
Anyone ?
Thanks
Dave
How constant versus terminal voltage? What supply voltage is
available?
This is always fun:
V+-----------------+--------------+
| |
| |
| R2
red led a |
k |
| e
+-------------b pnp
| c
| |
R1 |
| |
| |
| out
gnd
John
.
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