PSU with 2 different Output Voltages ?

[Joey]

I have bought a Micro-Dispensing valve for a project of mine and I`m finding their Spike and Hold Driver instructions a bit confusing as it refers to two power supplies.
The valve requires a Spike Voltage of 24vdc set for 0.3 millisecs and a Hold Voltage of 3vdc
I am hoping to use a single power supply and would greatly appreciate being shown how to incorporate components to reduce one of the psu outputs to 3vdc.
Is this feasable ? I`m such an electronics duh-brain

this is the psu I have
http://cgi.ebay.co.uk/24V-10Amp-250W...QQcmdZViewItem

Please see the attached pics for the Driver Instructions

[Al_The_Man]

The ideal way would be of course to have a combined supply, you could use a zener circuit, simple, but not very efficient, (heat waster).
This would consist of a 50ohm 20w resistor from a 24vdc terminal in series with a 3v 2w zener to ground, the 3v would come off the top end of the zener and ground.
BTW all the 24vdc outputs on the supply are common to each other.
Al.

[Joey]

Thank you very much Al
I`ll try digest that and look for the components.

Not too sure what you mean " 3v would come off the top end of the zener and ground"

best regards

[Al_The_Man]

Originally Posted by Joey Not too sure what you mean " 3v would come off the top end of the zener and ground"

I guess that should read Between the top end of the zener and common (ground) like this http://www.reuk.co.uk/Zener-Diode-Voltage-Regulator.htm
You might want to add a 100µfd capacitor across the zener output.
If you google zener resistor circuit you should find some more examples.
Al.

[pastera]

What is the current?
You may be able to use a simple current regulator fed with the 24 volt supply.
The current regulator can be as simple as a transistor, diode and a couple of resistors.

Aaron