Whyf electronic is important in planning to construct an electronic project circuit?
Answers
Before I go into details about how a circuit is designed, let us first know what a circuit is and why do we need to build a circuit.
Before I go into details about how a circuit is designed, let us first know what a circuit is and why do we need to build a circuit.A circuit is any loop through which matter is carried. For an electronic circuit, the matter carried is the charge by electronics and the source of these electrons is the positive terminal of the voltage source. When this charge flows from the positive terminal, through the loop, and reaches the negative terminal, the circuit is said to be completed. However this circuit consists of several components that affect the flow of charge in many ways. Some may provide a hindrance to the flow of charge, some simple store, or dissipate the charge. Some require an external source of energy, some supply energy.
There can be many reasons why we need to build a circuit. At times we may need to glow a lamp, run a motor, etc. All these devices-a lamps, a motor, LED are what we call as loads. Each load requires a certain current or voltage to start its operation. This voltage may be a constant DC voltage or an AC voltage. However, it is not possible to build a circuit just with a source and a load. We need a few more components that help in the proper flow of charge and process the charge supplied by the source such that an appropriate amount of charge flows to the load.
There can be many reasons why we need to build a circuit. At times we may need to glow a lamp, run a motor, etc. All these devices-a lamps, a motor, LED are what we call as loads. Each load requires a certain current or voltage to start its operation. This voltage may be a constant DC voltage or an AC voltage. However, it is not possible to build a circuit just with a source and a load. We need a few more components that help in the proper flow of charge and process the charge supplied by the source such that an appropriate amount of charge flows to the load.A basic Example – Regulated DC Power Supply to run an LED
There can be many reasons why we need to build a circuit. At times we may need to glow a lamp, run a motor, etc. All these devices-a lamps, a motor, LED are what we call as loads. Each load requires a certain current or voltage to start its operation. This voltage may be a constant DC voltage or an AC voltage. However, it is not possible to build a circuit just with a source and a load. We need a few more components that help in the proper flow of charge and process the charge supplied by the source such that an appropriate amount of charge flows to the load.A basic Example – Regulated DC Power Supply to run an LEDLet us a basic example and the step by step rules in building the circuit.
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Electronic Project Plan Step 2: Design the Circuit
RELATED BOOK
Electronics All-in-One For Dummies
By Doug Lowe
Once you have an idea for an electronic project, the next step is to design a circuit that meets the project’s needs. At first, you’ll find it very difficult to design your own circuits, so you can turn to books or to the Internet to find other people’s circuit designs. With a bit of Google searching, you can probably find a schematic diagram that’s very close to what your project needs.
In many cases, you may find a circuit that’s close, but you may need to make minor modifications to make the circuit fit your project’s needs.
One helpful strategy for designing circuits is to break complex requirements down into simpler parts. Imagine a Halloween jack-in-the-box project. It would be very complex, but can be made simpler by breaking it into its separate elements, like these:
A circuit to detect when someone has entered the room to trigger the prop’s action
A circuit to open and close the jack-in-the-box
A circuit to time how long the jack-in-the-box should stay open
A circuit that plays a screaming sound
A circuit that provides a 30-second delay before the prop is activated again
Now imagine a simple electronic project where you design the circuits to toss a coin for you. The coin-toss project is much simpler than the jack-in-the-box project. In fact, a quick Google search will turn up several possible circuits that do almost exactly what the coin-toss project requires.
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This schematic diagram differs from the coin-toss project’s needs in just two ways. It doesn’t have an on/off switch and it uses a pushbutton instead of the user’s fingers to start and stop the LEDs from flashing.
It’s easy to make those modifications: Add a push-button switch that must be pressed to provide the +9 V voltage needed to run the circuit and replace the pushbutton that was in the original schematic with two open terminals. When the user touches these two terminals, the resistance of his or her finger completes the circuit.
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One final step you might want to consider when designing a circuit is to create a final version of the schematic diagram that indicates what components will be mounted on your final circuit board and what components won’t be on the circuit board. This diagram will come in handy later, when you’re ready to create the circuit board that will become the permanent home of your circuit.
For example, imagine a version of the coin-toss circuit that uses a dashed line to delineate the items that won’t be mounted on the circuit board: the battery power supply (that is, the +9 V voltage source and the ground), the push-button power switch, the two metal finger contacts, and the two LEDs.
Instead, they’ll be mounted separately within the project box. Thus, the circuit board will need to hold only six components: the 555 timer integrated circuit, the four resistors, and the capacitor.