2x FK915 LOW BATTERY ALARM SENSOR CAR MOTOR 12VDC,DIY BUZZER SOUND,UN-ASSEMBLED, US $18.00 – Picture 0

2x FK915 LOW BATTERY ALARM SENSOR CAR MOTOR 12VDC,DIY BUZZER SOUND,UN-ASSEMBLED, US $18.00 – Picture 1

2x FK915 LOW BATTERY ALARM SENSOR CAR MOTOR 12VDC,DIY BUZZER SOUND,UN-ASSEMBLED, US $18.00 – Picture 2

2x FK915 LOW BATTERY ALARM SENSOR CAR MOTOR 12VDC,DIY BUZZER SOUND,UN-ASSEMBLED, US $18.00 – Picture 3

2x Fk915 Low Battery Alarm Sensor Car Motor 12vdc,diy Buzzer Sound,un-assembled

US $18.00

Bangkapi, BA, Thailand
Jun 9th

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2x FK915 LOW BATTERY ALARM SENSOR CAR MOTOR 12VDC,DIY BUZZER SOUND, ELECTRONIC CIRCUIT BOARD,FUTURE KIT, UN-ASSEMBLED KIT (2 Pcs.) Introductory This is an interesting and varied range of devices which covers test and measurement, signal sources and environmental sensors. Teachers are presented with a wide array of economical, practical and easily constructed projects suited to science, environmental, and electronic technology studies. This alarm unit only has to work, once, to pay for itself. Over- draining of SLA batteries will inevitably cause their failure. This electronic circuit continually monitors the battery voltage and, if it should fall below the minimum set point, the FK915 will sound an audible alarm. Further battery protection may be achieved by adding a disconnect circuit to ensure no further drain. Technical data - This circuit can be adjusted alarm from 7.8 to 12 volts by adjusting at trimmer potentiometer. - Normally 10 volts adjustment is suggested for 12 volts battery. - IC board dimension : 1.87 in x 1.43 in. Note: - No Supply Needed to the circuit. Direct connect to Car battery - One POT to adjust alarm voltage 9-12VDC - Normally, alarm voltage will be set at 10VDC -This board can alert you by sound when the battery is low / setting low voltage from 9V to 12V -Example: You set alarm voltage at 10V, when you connect the board to your car battery, buzzer on board will sound to alert you that your battery is too low ( voltage is below 10V ). Something may happen to your battery, or charging system. It is good for you to pre-check what happen. How does it work R1, R2, R3, R4 and VR1 all working together as a voltage divider circuit. VR1 is a potentiometer which can adjust or trim the trigger voltage of the alarm circuit (in this case 3.8-volt is recommended). The following explanation will focus only on what make the alarm giving out sound (the opposit logic of explanation can be opplied in the case of "no sound"). When battery become depleted, the voltage also become lower and if this voltage run below 3.8-volt there will be no current at C of TR1 because B of TR2 is not grounding. The functioning of TR2 make TR3, TR4, TR5 active which let the dynamic buzzer giving out sound. PCB assembly The assembly of components is shown in Fig. 2. For good looking and easy assembly, the shorter components should be first installed - starting with low resistant components and then the higher. An important thing is that diodes, electrolyte capacitors, and transistors shall be carefully assembled before mounting them onto their right anode/cathode of the IC board otherwise it might cause damage to the components or the circuit. Configuration of the anode and the cathode is shown in Fig 3. Use the soldering iron/gun not exceeding 40 watts and the solder of tin-lead 60:40 with flux within. Recheck the correctness of installation after soldering. In case of wrong position, just use lead absorber or lead extractor wire to avoid probable damage to the IC. Testing Connecting with 9 to 12 volts and adjusting trimmer potentiometer VR1. If there is sound when turning to other side means the circuit is workable. Application When you want this circuit to alarm when 12-volt battery run down to 10-volt. First connect 10V (DC current) to the positive and grounding pole of the circuit respectively. Then turn VR1 to zero position (counterclockwise) no sound will be heard. Begin to rotate VR2 clockwise until the you can hear the sound. Put 12-volt battery into the circuit (see fig 2). This circuit provide 7.5 to 12-volt warning range of application. Covering dynamic buzzer by plastic tube will make the sound more lounder than normal. Free Shipping Handling WORLDWIDE. The package will be shipped directly from Thailand via Economy/Standard Small package Airmail, and it will take about 11-23 Business Days (or about 2-5 Weeks) **Import duties, taxes and charges are not included in the item price or shipping charges. These charges are the buyer’s responsibility. **Please check with your country’s customs office to determine what these additional costs will be prior to bidding / buying Return Policy 100% Satisfaction Guarantee: If you are not satisfied with the product you purchased for any reason, please contact us for a return instruction within 30 days Shipping Handling costs are not refundable. Return shipping cost will be paid by buyer. We accept ONLY PayPal for payment. Contact us Please contact us by eBay message only.

Condition:	New: A brand-new, unused, unopened, undamaged item in its original packaging (where packaging is applicable). Packaging should be the same as what is found in a retail store, unless the item is handmade or was packaged by the manufacturer in non-retail packaging, such as an unprinted box or plastic bag. See the seller's listing for full details. ...	Brand	Future Kit
MPN	120315
Model	FK915
Country/Region of Manufacture	Thailand
UPC	Does not apply