I have been learning some things about hobbyist level electronics for about a year now and have realized that my progress is very slow because I am not learning in the way I learn best. My best understanding is this: All the resources I've run into so far teach in a "bottom-up" fashion. In the case of a capacitor, what might be done is to explain that a capacitor is two metal plates separated by a dialectric, etc. The next step is sometimes to show it being used in a simple diagram and explaining what it is doing. We pull out our oscilloscope and see that the voltage level across the capacitor rises as soon as it receives power, then stops changing. (Technical college classes are usually taught this way. Theory first, application later--and a lot of people are unhappy about it, particularly large technical corporations.)
I learn best with top-down instruction, which one might think of as a divide-and-conquer approach: Codify the problem that you are trying to solve, then ask what would solve it. Then access the tools one has learned about to solve that sort of problem, and then reask the question for each tool that is part of the solution. I want to build a guitar preamp. How shall I do that? Well, I know that a transistor can be used to amplifier a signal and that I'll probably need resistors to change voltages to meet transistor specifications. But resistors sometimes produce significant electrical noise. So I might need a way to filter out some of that noise, etc. The math might be taught at this point as a way to determine component values for a solution. Eventually the student will head toward bottom-up learning on their own when they see that it will be a solution to a problem they have. It happens when they have run into the same situation enough that they want to understand why that pattern exists.
The primary motivation to teach top-down is because it is much easier to hold a student's interest, which is necessary at some level for them to really learn. (An instruction designer might call this being "on task." We might call it being "in the zone.") At present I might not care how a capacitor works, but am interested in how a guitar preamp works. This excites my mind to examine the building blocks needed to design a guitar preamp, but not to learn about capacitors. I'll want to learn about capacitors when a single capacitor is going to solve a problem I have.
Can anyone recommend circuit design learning resources that do this? A couple "practical-oriented" basic resources I have might sound like they would do that, but they don't. There often isn't even an attempt to visually divide a circuit its logical subcircuits. I suspect that people that learned bottom-up have trouble converting what they learned into top-down instruction. "That's not the way I learned it." (That's why instructional design is a degreed field.)
To illustrate my current conundrum, I refer to the Tillman Discrete FET Guitar Preamp near the top of the page at http://www.till.com/articles/GuitarPreamp/. I want to modify this circuit to have a gain control, but have nowhere to start since I have no idea what the purpose of each component was/is, other than the FET. I could tell you what a resistor does (along with some math) and to some degree what a capacitor does, and I can explain to you the physics behind NPN doping, but it's all meaningless in a higher level context ("what is this circuit doing"). The resources I have been learning from never views building up the circuit design from that perspective. Ideally I would learn how to build up a circuit with subcircuits because I have learned what they do as a unit and then also how to alter subcircuit attributes with other components/subcircuits.
By the way, an even simpler example would be how to think of an RC or LRC circuit as a functional unit. The introductory information I've found about these doesn't discuss what an LRC circuit is as a single functional unit other than to say circuit with resistance and a synergy between its inductance and capacitance. That information doesn't help me design a radio circuit.
I learn best with top-down instruction, which one might think of as a divide-and-conquer approach: Codify the problem that you are trying to solve, then ask what would solve it. Then access the tools one has learned about to solve that sort of problem, and then reask the question for each tool that is part of the solution. I want to build a guitar preamp. How shall I do that? Well, I know that a transistor can be used to amplifier a signal and that I'll probably need resistors to change voltages to meet transistor specifications. But resistors sometimes produce significant electrical noise. So I might need a way to filter out some of that noise, etc. The math might be taught at this point as a way to determine component values for a solution. Eventually the student will head toward bottom-up learning on their own when they see that it will be a solution to a problem they have. It happens when they have run into the same situation enough that they want to understand why that pattern exists.
The primary motivation to teach top-down is because it is much easier to hold a student's interest, which is necessary at some level for them to really learn. (An instruction designer might call this being "on task." We might call it being "in the zone.") At present I might not care how a capacitor works, but am interested in how a guitar preamp works. This excites my mind to examine the building blocks needed to design a guitar preamp, but not to learn about capacitors. I'll want to learn about capacitors when a single capacitor is going to solve a problem I have.
Can anyone recommend circuit design learning resources that do this? A couple "practical-oriented" basic resources I have might sound like they would do that, but they don't. There often isn't even an attempt to visually divide a circuit its logical subcircuits. I suspect that people that learned bottom-up have trouble converting what they learned into top-down instruction. "That's not the way I learned it." (That's why instructional design is a degreed field.)
To illustrate my current conundrum, I refer to the Tillman Discrete FET Guitar Preamp near the top of the page at http://www.till.com/articles/GuitarPreamp/. I want to modify this circuit to have a gain control, but have nowhere to start since I have no idea what the purpose of each component was/is, other than the FET. I could tell you what a resistor does (along with some math) and to some degree what a capacitor does, and I can explain to you the physics behind NPN doping, but it's all meaningless in a higher level context ("what is this circuit doing"). The resources I have been learning from never views building up the circuit design from that perspective. Ideally I would learn how to build up a circuit with subcircuits because I have learned what they do as a unit and then also how to alter subcircuit attributes with other components/subcircuits.
By the way, an even simpler example would be how to think of an RC or LRC circuit as a functional unit. The introductory information I've found about these doesn't discuss what an LRC circuit is as a single functional unit other than to say circuit with resistance and a synergy between its inductance and capacitance. That information doesn't help me design a radio circuit.