Industrial Adjustable Output Positive Voltage Power-Supply Kit (Adj. output 1.25V to 24 VDC) with Heat-Sink is an OEM electronics power supply board that allows you to connect up to 30V AC or DC on one side of the board and get adjustable DC  voltage (VDC) regulated on the other side. Every facility should have a few of these boards handy. The boards will allow you to easily power all your HVAC controller, interface board and low-voltage equipments components (i.e. 9V, 12VDC 24VDC). The Terminal Block TB connector is included and makes it easy to use. 




 Standard Board (left) with small Heat-Sink and High current configuration (right) with large Heat-Sink

The board Available with many others heat sink configuration







Figure A above shown with maximum configuration


1. Output DC voltage

2. Input AC or DC voltage

3. Output DC voltage Adjustment via multi-turn trimmer.

4. Heat-sink



Mounting Option


Board, shown above mounted in plastic enclosure (EID-1593 series enclosure) with din-rail-clip (optional). 




Plastic enclosure and Din-Rail-clip are sold separately (for demonstration only).



Some of the features of the PS (LM317) include: 1% output voltage tolerance, max. 0.01%/V line regulation, max 1A output current, adjustable output down to 1.25V, current limit constant with temperature, 80 dB ripple rejection, output is short-circuit protected.


The board includes protection diode prevent capacitors from discharging thru the regulator during an input short circuit.


Heat sinking block is usually require when pulling current > 400mA (optional). Heat sink are manly manufacture from Aluminum material.


Final Note: As a general rule the input voltage should be limited to 2 to 3 volts above the output maximum voltage. The board can handle up to 36 volts input, be advised that the power difference between the input and output appears as heat. If the input voltage is unnecessarily high, the regulator will overheat. Unless sufficient heat dissipation is provided through on the board heat sinking, the regulator will shut down. Therefore, you will need to  mount a heat-sink on the regulator that is capable of dissipating the access heat produced. please also note, that the metal body of the regulators LM317 or LM338  (TO-220 package) is connected internally to the output leg of the IC (Not to Ground!).


Please drop us a line at and let us know where you use this unique adjustable power supply board. Or, of course, if you have any adjustments deemed important--and one of our engineers will be happy to help you achieve them.


Description and SKU#



1.25-24VDC PS, Input up to 30VDC & adj. output  1.25V to +24V low current, w/LM317 TO-220










  PCB size 2.5" * 1.5"




1.25-24VDC PS, Input up to 30VDC & adj. output  1.25V to +24V high current, w/LM338 TO-220












Modified Translucent blue ABS Plastic Instrument enclosures option



Din rail mounting mounting kit option