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Candlelight vigil to honor the life of Ruth Bader Ginsberg RBG hosted by Action Illinois and Resistor Sisterhood along with other community partners on the sidewalk in front of the Federal Courthouse in Springfield Illinois
Resistors have color codes to tell them apart, and you will learn them if you develop an interest in electronics. You don't have to worry about memorizing the code- that will come by using them. The three we'll use in our experiments in class are 470Ω, 150Ω, and 100Ω, and the color stripes on them are here for you to tell them apart.
VCS1625,"elctronic parts" "electronics parts" "capacitors electromechanical parts" switches "crimp terminals" "heat shrink" breadboards "project boxes" "cable ties" fans lcds "Foil Resistor Chips" "Mount Chip Resistors" "Grade Resistors" "Fixed Resistors" "Metal Strip Resistor" "Molded Surface Mount" "Strip Resistor" "Voltage Divider" "Precision SM Network" "Hybrid Chips" "Chip Resistor" "Precision Foil" "Hermetic Resistor" Wraparound "Foil Wraparound" "PRND Networks" "Precision Trimming"
The solder side of the PCB. The middle 3 terminals are linked, one reason I suspect a more complex PCB with the complete 706 regulator could be fitted.
I do love the 'other side up' instruction too.
To check the capacity of a battery the above test setup can be used.
The discharge load can be a simple resistor (though that makes calculating the end result more difficult) or a constant current circuit or electronic load.
The volt-meter allows the end of discharge to be detected and in an automatically logged system the voltage profile can be captured.
To measure the capacity of a battery a load is applied to a fully charged battery and the time taken to discharge to the point the battery is flat measured. To obtain a fully charged battery the supplied charger can be used.
In the case of a constant current load the capacity is simply the product of the time x load current. Eg. If the discharge time is 3 hours at a discharge current of 500mA then the measured capacity is 1500mAh or 1.5Ah.
If a resistive load is used then the current reduces as the battery voltage falls due to Ohm's law. In this case the current must be averaged over the discharge curve to obtain the equivalent constant current. If the measuring system is automated then this is easily achieved by logging current, voltage and time in a CSV format and processing the raw data in a spreadsheet programme such as Excel.
The connection between battery and load should be fat wires and separate to the wiring connecting the battery to the volt-meter. Ideally the volt-meter should be connected at the battery terminals with the load wiring connected separately.
End of Discharge Voltage:
In the case of the these LP-E6 batteries, they are a 2-cell battery pack. Two lithium ion batteries are connected in series internally. The terminal voltage is therefore 2x the terminal voltage of a single cell (such as found in compact cameras for example). This also applies to the end of discharge voltage.
Typically the end of discharge voltage is around 2.5V per cell. Therefore for the LP-E6 the discharge ends when the volt-meter indicates a battery terminal voltage of 5V or less.
The following graphs were obtained using an automated test setup which uses a constant current electronic load and automatically logged current and voltage. It uses a simple Python programme running test equipment over a USB/GPIB control bus.