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What happens when a resistor and a diode are parallel?
A diode and resistor of a higher value in parallel will follow ohm;s law in the reverse biased direction, while in the forwarsd direction the voltage drop will be about the same as a diode forward voltage drop in the forward direction. That can be useful in nmany instances. What’s happening here ? Here’s another more complicated schematic.
What does a resistor do in an opto coupler?
A resistor across the LED in an opto-coupler does two different things, depending on the applied voltage. For a switching application it tends to reduce the sensitivity a bit, which reduces the effect of leakage currents from the driver circuit. It also provides a path for reverse voltages.
Is it safe to connect two diodes in parallel?
Problems can also be created or aggravated by the wiring itself. If you have slightly more path resistance through one diode the error will tend to make that diode have less current. The general rule I use for unballasted diodes in parallel is two diodes are safe at s about 1–1/2 times the current of one diode.
Why does the diode D2 have a resistor R2?
Since current flows in both directions in the connection between the discharge and trigger connections, the diode D2 with resistor R2 allows a lower current to flow during the discharge portion of the cycle. D1 provides a much faster charge with a charging current limited by R1. This looks a lot like a homework assignment.
Why are resistors important to a printed circuit board?
Without them, a PCB would not be able to perform its tasks. Each of these components has a specific function. Resistors are a part of a Printed Circuit Board. A resistor creates resistance in the flow of electricity. When calculating resistance the measurements are in ohms.
Why are resistors shown to have varying resistances?
Resistors can also be shown to have varying rather than fixed resistances. This might be for the purpose of describing an actual physical device designed for the purpose of providing an adjustable resistance, or it could be to show some component that just happens to have an unstable resistance: