#### bonbonbaron

- Sep 11, 2015

- 16

- Joined
- Sep 11, 2015

- Messages
- 16

I'm learning how to design circuits from scratch. Yes, I know there are lots of ready-made plug-in kits out there, and a lot of rules-of-thumb for which resistor values to use with which components... But I want to understand circuit design from the ground up. That way I can build freely.

I'm analyzing a relaxation oscillator. I'm going to put an LED at Vout (it's rated for 30mA forward current and 3.0-3.6V forward voltage). Now, assuming +V is 6V, I want to figure out what all my other elements should be if I want the LED to blink at a frequency of 2Hz with a duty cycle of 50%.

What's the general method for designing a circuit like this? And does there come a point when a desired circuit gets too complex to design on paper? If so, then what's the general methodology for designing circuits in a simulator like MATLAB's Simulink?

(Please assume that I know Kirchhoff's Laws and how all the components work. And I'm

Thanks!

3B

I'm analyzing a relaxation oscillator. I'm going to put an LED at Vout (it's rated for 30mA forward current and 3.0-3.6V forward voltage). Now, assuming +V is 6V, I want to figure out what all my other elements should be if I want the LED to blink at a frequency of 2Hz with a duty cycle of 50%.

What's the general method for designing a circuit like this? And does there come a point when a desired circuit gets too complex to design on paper? If so, then what's the general methodology for designing circuits in a simulator like MATLAB's Simulink?

(Please assume that I know Kirchhoff's Laws and how all the components work. And I'm

*not*asking for what this specific circuit's elements should be-- I'm asking*how you figure that out.*)Thanks!

3B

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