They cost less than 1 cent each, but humble resistors are an essential tool no matter what electronics you are building. In this reference guide we look at using them in projects, and how to identify the correct resistor for your project.
Table 2.Calculating the load current and voltage drop. The advantage is that you can quickly determine what would happen to that single resistor if it were of a value other than 2 Ω without having to go through a lot of analysis again. Just plug in that other load resistor, V, value ...
In addition to the transistor voltage drop, the LED will also drop somewhere between 1.2 and 3 volts when it’s switched on (check the datasheet under VF). Therefore, in order to calculate the correct value for resistor Rc, the voltage drop across the collector/emitter (VCE(sat)) and th...
Examine the data sheet for the LED you wish to use. Identify the specifications for maximum current (Imax) and typical forward voltage (Vf typ). Example: 9-volt battery LED Imax = 20milliamps (mA) Vf typ=2 Volts (V) Step 2 Determine the voltage drop across the resistor (Vr). This ...
Node that connects to GND when the “cancel” button is pressedTack-solder 3 wires to each of these nodes. In the photo below, the black wire goes to ground, the green wire goes to the high side of the limiting resistor for the “toasting” LED (i.e. 5V during “toasting...
to the resistor, and an electro-optical crystal electrically connected between the contact pins in parallel with the resistor, the electro-optical crystal having a voltage applied thereto responsive to the voltage drop appearing across the resistor, wherein the voltage applied to the electro-optical ...
pin will be HIGH because of the high impedance output causing no voltage drop across the pullup resistor. It is important to note that if an external voltage rail is used in this mode, PG will remain high even if the output voltage turns off ...
英语翻译LED must be current limited 100MA MAX which will result in a forward voltage drop of 1.1-1.7VDC.Do not exceed use 39 OHM resistor in series with LED and 5V input or obtain value by R=(Vcc-1.4V)/.10A
By measuring the voltage at the terminals of the shunt resistor and knowing its resistor value, the current value is easy to calculate. STLINK-V3PWR has four parallel analog paths, each occupying a different current range to cover a large dynamic range of ...
During operation, the heat-generating resistor is subjected to a mechanical shock caused by repetitions of the production and extinction of bubbles of ink, and is subjected to a rise or a drop of temperature over 300° C. for a very short period of the time on the order of 1 to 10 mic...