ANYTHING BASED ON DIODES WILL DRAW MUCH MUCH MORE(!!!) I did my lesson. Indicating range 3.0-36V - Can be set using small flat screwdriver and you will need adjustable DC Power supply - I can set it to any Voltage from 3V to 18V (in example 7.7V) DO NOT WORRY - I`ll DO THIS FOR YOU!Ĭurrent Draw(power consumption) approx 0.01A(10mA) when led is not lit - please note: THIS IS THE LOWEST DRAW I COULD ACHIEVE FROM BASIC ELECTRONIC PARTS. My Stagg EUB still works ok when 4V and above (4-9V range) The days of low battery life are a thing of the past, with our Universal. You can choose the voltage which will lit the led.ĮMG, Bartolini, Seymour Duncan and others use 9 volt batteries and its recommended to set it to 7.7V HERCHR Universal External Battery Charger LED Indicator For Samsung S3 S4 Smart. It works with 9V battery (or 2 of them) and It can be set up via trimmer resistor to indicate any voltage between 3V and 36V Worrying about dead battery in the middle of a tune on a gig? - You do not have to any more with this circuit! This is a very simple 9V low battery indicator circuit which has 2 LEDs, one green which will light up when the battery voltage is higher than 6.9 volts. if its still ok the led will not lit up(!) I would use a circuit that indicated (with a small LED) when the battery voltage was 'good', and disconnect the battery when the battery voltage is 'low'. You can remove battery and test it outside the bass. !!! Are You familiar with basic electronics and soldering and understand this device needs to be switched off when NOT IN USE? !!! In this electronics project, I have shown how to make battery level indicator circuit using LM3915 IC at home to monitor the 9V or 12V battery volt level. D1 Zener diode keeps inverting input of the comparator at approximately 2.2V 2.3V, midpoint 2.25V. If battery voltage drops below 7.2V (the voltage most manufacturers consider the end of battery life) the red LED turns ON. APOLOGIES - Im not doing it any more << A simple OPAMP based low battery indicator circuit.
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