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Battery Voltage Guard

adjustable to any voltage

Battery Voltage Guard
This month’s Mini Project may be used to guard any voltage ranging from a minimum of 3 V to a maximum of 25 V. It can, therefore, be used to keep a constant eye on the voltage of a car battery. But it can also be used with the receiver batteries of a radio-controlled model, for example.Even though this is an extremely simple electronic circuit, the voltage guard, equipped with a 10-segment LED display, offers a number of distinct advantages. Firstly, this circuit is very compact, it can therefore easily be built into a suitable case — the circuit board is no bigger than a matchbox and there will generally be no problem to find some space for it. Secondly, the circuit (especially when in ‘dot-mode’) is very thrifty with current.
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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.

R1 = 1k?
R2 = 10k?
P1 = 25k? preset
P2 = 10k? preset
C1 = 100nF
D1-D10 = high-efficiency LED
IC1 = LM3914N
JP1 = jumper
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