[GreenKeys] Loop power supplies

[drlegendre .]

"There is a 15K load resistor too IIRC. "

Yup yup, wasn't paying attention to that.

On Mon, Mar 5, 2018 at 8:09 AM, Jeffrey Angus <jdangus at att.net> wrote:

> On 3/5/18 7:47 AM, Nick England wrote:
>
>> Clearly I am confused.
>> What is the diff between a current regulated source and a
>> constant current source?
>>
> A current regulated source sets a current for a given load.
> Change the load and the current changes.
> A current source, will supply a constant current regardless of
> the load. Until it runs out of voltage (compliance) to supply the
> current.
>
>> Is there a corresponding diff between a voltage regulator and
>> a constant voltage source? What is a 7815? A three terminal
>> device that provides a constant voltage regardless of load. Isn’t
>> that what a voltage source does?
>>
> LM7815, a 15 volt positive regulator.
> It is the opposite of a current source.
> The operation of a voltage regulator is to maintain a fixed voltage
> regardless of input voltage. Up to the current rating of the input.
>
>> If this TMC device is set for 60ma into 2000 ohms it provides
>> 120v. What do you think it provides into 1000 ohms?
>>
> 60 volts.  And 6 volts across a 100 ohm load.
> And for each different load, you have to readjust the current.
> it is NOT a constant current source. It is a regulated, for a given
> load, source.
>
>
>
> --
> "I am a river to my people."
> Jeff-1.0
> WA6FWI
> www.foxsmercantile.com
>
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