When you are a beginner you learn by building using other people's designs. As you acquire knowledge and experience you then become more capable of designing on your own.
My first build as a teenager was a light-beam interrupter burglar alarm for our family grocery store. This was a design straight out of the Phillips Electronics Engineer kit. My next build was a darkroom timer from Practical Wireless magazine using an 6SN7 twin triode. In both cases I could not analyze the circuits on my own though I understood how the circuits worked.
By the time I reached 4th year college I was able to design my own circuits. I designed and built a digital darkroom timer and a digital frequency display for my Realistic DX150B MW/SW radio.
My first build as a teenager was a light-beam interrupter burglar alarm for our family grocery store. This was a design straight out of the Phillips Electronics Engineer kit. My next build was a darkroom timer from Practical Wireless magazine using an 6SN7 twin triode. In both cases I could not analyze the circuits on my own though I understood how the circuits worked.
By the time I reached 4th year college I was able to design my own circuits. I designed and built a digital darkroom timer and a digital frequency display for my Realistic DX150B MW/SW radio.