• on Hobby & Modelling
  • Published in issue 7/2014 on page 112
About the article

Water Pump Regulator

for yachts, mobile homes, etc.

Water Pump Regulator
In principle, a water system comprises a distribution network pressurized by a 12-V pump typically drawing 5–10 A, and usually operating in an on/off fashion, and an expansion vessel. The latter eliminates sudden changes in the flow and ram effects. It is a source of comfort, but also of problems: space taken up, maintenance, etc. New models of electric pumps make it possible to dispense with the expansion vessel. Instead, a little electronic circuit takes care of running the pump according to the flow.
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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor Members can exclusively download these files for free as part of their Membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service. Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

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The BOM (Bill of Materials) is the technically exhaustive listing of parts and other hardware items used to produce the working and tested prototype of any Elektor Labs project. The BOM file contains deeper information than the Component List published for the same project in Elektor Magazine. If required the BOM gets updated directly by our lab engineers. As a reader, you can download the list here.
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R1 = 1k?
R2 = 10k?
R3 = 2.5k? preset
R4,R5 = 470?

C1, C2 = 100nF, 2.5mm
C5 = 100nF, 5mm
C4 = 33µF 10V, radial, 2mm
C3 = 470µF 25V, radial, 5mm

D1 = 1N5408
D2 = 1N4001
D3, D4 = LED, red, 5mm
T1 = RFP70N06, N-MOSFET 70A 60V
IC1 = PIC16F684-I/P, programmed
IC2 = 7805

K1 = 3-pin PCB screw terminal block, 0.2’’ pitch
K2 = 5-pin pinheader, 0.1’’ pitch
K3 = not connected
14-way DIL IC socket
Pump used: Jabsco PAR-MAX 1.9 gal/min (7.2 l/min) 12 V 3 A

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