How to get a dc power supply to produce 2V at 10-20 milliamps?

  • Thread starter pb23me
  • Start date
  • #1
207
0
I just got a adjustable dc power supply and I cannot figure out why it will not produce 1-2V at very small amps such as 10-20 milli amps? Is this not possible with a common dc power supply? I would greatly appreciate some help with this...
 

Answers and Replies

  • #2
What brand and make is the power supply?
What kind of load are you connection this to?
 
  • #3
sophiecentaur
Science Advisor
Gold Member
27,196
5,906
What resistor would you expect to connect across 2V to pass 20mA?
 
  • #4
1,763
59
You don't need a power supply, you need an opamp.
 
  • #5
sophiecentaur
Science Advisor
Gold Member
27,196
5,906
But you can ONLY get a 2V source to produce a current of 20mA through one particular value of resistor. If you have an open circuit at the terminals then the current will be 0mA. The supply can't 'insist' on any value of current.
The current depends upon the Load and the Supply Volts:
I = V/R

Perhaps you should specify a bit more about the circumstances of the OP. I have a feeling there is something else we should know.
 

Related Threads on How to get a dc power supply to produce 2V at 10-20 milliamps?

Replies
3
Views
2K
  • Last Post
Replies
18
Views
12K
Replies
11
Views
1K
Replies
4
Views
2K
  • Last Post
Replies
10
Views
3K
Replies
19
Views
58K
  • Last Post
Replies
1
Views
1K
Replies
1
Views
901
  • Last Post
Replies
4
Views
6K
  • Last Post
Replies
11
Views
4K
Top