High Voltage DC Regulator

Thread Starter

andrewjpas

Joined Dec 7, 2017
3
Good Morning

I have been searching for a while now trying to locate a regulator that will accept a variable DC voltage from 10-120v and supply a constant output of 3v 50ma, having been unable to find anything to meet these requirements i thought i would ask here if anything like that is available or maybe someone can suggest another option

It is basically to an give conformation via an LED than various DC motors we have built into a piece of equipment have a supply voltage as the kit in question is not easily accessible.

kind regards

Andrew
 

dendad

Joined Feb 20, 2016
3,427

Thread Starter

andrewjpas

Joined Dec 7, 2017
3
Hi, Thanks for the reply,

There are 6 motors in total all controlled by DC Drives and each one by its own potentiometer, the voltages do vary completely through that range unfortunately, quite tempted to go with the idea you have suggested as we will get an indication of voltage as well.

The idea was just to keep the unit very small as we wanted to mount it in the back of a connector housing, i have attached a small schematic but doubt it will be any use other than what i have explained

many thanks

Schematic.jpg
 

Alec_t

Joined Sep 17, 2013
11,141
You might find a standard USB charger/adapter would work with that supply range. They're cheaply available, so worth a try. A single resistor per LED could then provide current limiting from the 5V output.
Alternatively, use a USB charger/adapter from the mains as a 5V supply, then use the motor voltages to switch transistors which activate the LEDs, powered from 5V.
 
Last edited:

Alec_t

Joined Sep 17, 2013
11,141
..... and to minimise components you could use a single LED to check that there is >~0.7V at all motors (providing the motors are of a type which present a low impedance when unpowered and don't mind ~1mA of current being fed into them via R1) :-
Indicator2.PNG
 
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