Designing circuit from scratch

MakerSpace Chat
#1

Inspired by chotu bot model.
So started to explore circuit designing.
@Ashish_Pardeshi sir suggested to start with basic design of circuit for glowing small led light and also to find value of each component with drawing circuit on paper.
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After finding value I started to make and collect things which I required to make circuit.
So, today I purchased the following things to start
Imagepipe_19

Breadboard - 80₹
9V battery - 30₹
Resistance - 2₹
LED - 2₹
Battery cap - 5₹

So, their are two methods 2 find resistance value ohm’s law and krichoff law.
Let’s discuss this to improve basic foundation related to circuit.
@Farhan @ravi312 @jtd @G_N @ARYAN32

4 Likes
#2

@Ashish_Pardeshi please help me to design workable circuit of light.
How to use kvl law to balance the resistance

#3

Your reasoning looks okay, but not your calculations.

The forward voltage drop of the LED is (assume) 2 V.
Any voltage source you use to light it up will have to be at least 2 V or more. Nothing will happen if your source is, for example, 1 V. Also, ALL voltage sources have some amount of internal impedance, so ideally, you need something a little bit more than 2 V to light up a 2 V LED.

With that, the voltage that needs to be “dropped” by the “current limiting resistor” needs to be

(Voltage of Source)-(FWD Voltage drop of LED)/Current.

So, at 9 V supply, and 2V drop across LED with 20 mA current flow, you get
=(9-2)*1000/20
=7000/20
= 350 ohms

3 Likes
#4

Ohhh…
Ok I will use coin cell then adjust,
Ok thanks @Anool

#5

Means I use extra 9v
To light up led
And it is difused :rofl:

#6

You mean the LED fused?