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24 VDC to 0-10 VDC converter

russgmke

New Member
Hello, has anyone seen a 24 Vdc input to a variable 0-10 Vdc output converter? Maybe something that could be DIN rail mounted if it exists.
 

danadak

Active Member
0 - 10 V how much current ?

How do you want control, pot or button entry or rotary encoder ?

Current limit set ?


Regards, Dana.
 

ronsimpson

Well-Known Member
Most Helpful Member
It is unlikely you will find anything that goes down to zero. Many supplies cannot go below 2V.
 

danadak

Active Member




Regards, Dana.
 

Dick Cappels

Active Member
I remember seeing a clever circuit in which the voltage divider for an LM317 was referenced to -1.25 volts, allowing the output to go all the way to zero. The design also had a negative regulator that used the same trick.

There are not a lot of uses for power supplies that can do down to zero, are there?
 

JimB

Super Moderator
Most Helpful Member
There are not a lot of uses for power supplies that can do down to zero, are there?
I agree that it sounds like a bit of an oxymoron, but there are times when it is useful to be able to turn the voltage up from zero or down to zero.
Usually when trying to assess the start-up or shut-down behaviour of some circuit or device.

In fact, in the last year or so I did build a small PSU for injecting 0 to 10v DC test signals into a circuit.

JimB

PS, and here it is...
Schematic.png


Wow, two years ago.
Doesn't time fly when you are enjoying yourself?

And it works just how Dick Cappels described.
 

Tony Stewart

Well-Known Member
Most Helpful Member
The ZPD's will get hot drawing the same load as output. 3x Si diodes could be better if they were fwd biased unlike reverse as shown.?

My Simulation https://tinyurl.com/2fm3bsbk > 700 mA may overload my model. The negative bias diode ripple is thus added to the output. Crude, but works. (noisy ripple) It might be better to make a bipolar supply then use a regulated Adj current to maintain the 1.25V across ADJ to OUT
 
Last edited:

JimB

Super Moderator
Most Helpful Member
Enhance your calm Tony Stewart.

Look at the picture, you will see that there are three 1N4148 diodes where the two "zeners" were drawn on my original scribble.

700mA is way more than my "DC Signal Source" is intended to supply, a milli-amp is more than enough.
And it worked well for the application I required at the time.

JimB

Small Voltage Source.JPG
 

Tony Stewart

Well-Known Member
Most Helpful Member
now you tell us Ha :) I guess for that all you need is a 10V regulator and a pot on the output.
 

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