How can I maintain a fix voltage until my battery is almost dead?
A battery's voltage naturally drops as it discharges. To get a stable voltage out of it, you want a voltage regulator. Voltage regulators come in two flavors, linear and switching. If you want the output voltage of the regulator to ever be higher than the battery voltage, you need a switching regulator. You will also get higher efficiency that way, so your battery should last longer.Now, in your specific case, you really need to look at the input voltage spec for your Arduino board. If it says it can handle 6-9 volts, or something like that, then an external regulator's not going to help. The board is already doing the best it can. To make it last longer, you would need to parallel more batteries.
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Car will not start. what could the problem be?
If the battery light on the dash was on (even intermittently) when the engine was running that indicated a fault in the charging system - you need to check out the charging system carefully. You will need a Volt Meter to accurately perform these tests. With engine off for 5 minutes. Check battery voltage: 12.6 V or higher = fully charged battery 12.4 V = battery 80% charged 12.2 V = battery 60% charged - May or may not have charge enough to crank engine. 12.1 V or lower Battery Severely discharged Charge battery before proceeding if a voltage of 12.3 volts or lower is observed. Charge a discharged battery for 10 hours using a 10 amp charger or Charge a discharged battery for 3 - 4 hours using a 30 amp charger. This will restore the battery to at least an 80% state of charge, it will take 36 to 48 hours at a trickle charge, after the fast charge is completed, to completely recharge a severely discharged battery in good condition, but 80% or better state of charge is sufficient to proceed with testing. Let battery rest for 5 minutes and repeat voltage tests above. If battery reads below 12.4 Volts after being properly charged and resting 5 minutes it is bad - replace it.0 volts, if it drops below 12.0 volts at the one minute mark the battery is bad.4 to 12.6 volts within 1 to 2 minutes for a healthy battery. Start the engine and let it run for 1 to 2 minutes. Check the battery voltage with the engine running, it should be between 13.5 volts under Very Hot conditions 90 degrees (F) ambient temperature or higher, to 14.6 volts under Cool to Cold conditions 45 degrees (F) or colder. Voltages between 14.0 and 14.4 are normal at all temperatures. Voltage of 12.2 to 12.6 indicates alternator not charging. Check drive belt. Voltage of 12.8 to 13.4 volts indicates either bad alternator (diode/rectifier) or bad voltage regulator or belt slippage. Voltage above 14.6 volts indicates a bad voltage regulator. Voltages above 15 volts will result in rapid damage to the battery and will also cause frequent lamp failures.
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How to charge capacitor beyond battery voltage?
You have to use some sort of inverter to increase the voltage to a level higher than that of the battery's voltage
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1997 Dodge Stratus--wont start---help please?
At this point some diagnostics are required. When you say it does the same thing as when the clutch isn';t in, do you mean that it turns over a particular way, or that it does not at all, or that it merely clicks, or what?? That car has the battery buried under other parts of the engine bay, and as a result, the battery terminals and electrolyte levels are never checked during service. I would start with a digital volt-meter on the "jump" pegs, and check the battery voltage. Static voltage less than 12.4 volts is going to indicate a poor charge condition. If you have something approaching 12.5 Volts, leave the meter connected and position it so that you can see it through the windshield; crank the engine - if the voltage drops below 10.5 Volts, battery or the terminals are the cause of your no-start, and need service. If the voltage remains high, somewhere around 12 Volts, most likely the starter assembly including the solenoid has failed. If the voltage remains very close to the static level, then yes you are looking at the control circuit. This includes the clutch interrupter switch, ignition/starter switch, and possibly the lock assembly not allowing the ignition switch to close. As to the mechanics of repair, when you isolate the cause, the rest is pretty clear. if the battery has not been replaced since you have owned the car, it is a good bet that your failure is here. It is unfortunate that Chrysler buries such an important component of the car. As a rule, most shops will service the battery during routine maintenance, but not here, because there is no pay for it, and it can take an extra 20 to 30 minutes. The customer must ASK for this service. Good Luck
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