I can't vote on this because I don't really understand the question:
What have I bought the most of - small capacitors and resistors
What have I spent the most on - pcbs - because custom industrial quality pcbs are expensive items used in every project but semiconductors are spread between the many types you have listed.
I've bought some of every item on your list except DSP
Probably more different amplifiers than anything else and quite a lot of value in them.
When I was in college (many years ago) transistors and a handful of ICs were the primary semiconductor devices that we were taught about. FETs were almost discouraged as easily damaged. Fast forward to the present, and MOSFETs are one of my most used components (I have 11 MOSFET part numbers in my current inventory, compared to only 4 microprocessors as I tend to typically use a single processor type in the majority of my projects). In my most recent design there are a total of eight FET/MOSFETs on board.
It's been a very slow year for me in terms of hobby projects, but I did buy some assortments of smd LEDs and resistors (passives, so those don't count), and a handful of opto-isolators that I intend to use for detecting 12volt inputs safely.
Very cool question.. I had a look at a few months of orders, and for me, nearly every order has a microcontroller, and maybe voltage regulators, but whenever a diode or transistor is purchased then the quantity is much larger, e.g. 100 at a go, (since it doesn't make sense to buy a few of them at a high price), so in terms of overall quantity, it is probably diodes and discrete semi's (BJT and MOSFETs), but nearly every project includes microcontrollers and voltage regulators.
I have not bought many LEDs only because I've already got a sufficient amount in a few popular SMD sizes, i.e. enough for prototyping. I have a "LED & optics" shoe-box full of packets of LEDs, the odd display, and optocouplers, etc).
Interestingly though, I have zero blue LEDs (not normally an issue, but I was specifically looking for blue yesterday, since I wanted to test some blue laser-light blocking eyewear, and realized I have none : (
So I looked at the blue LEDs on some existing product.. the blue completely disappears but they appear lit as faint yellow, through laser blocking specs, which was interesting!
The heart of most of my projects is a microcontroller but last year I experimented with op amps quite a bit. For sheer quantity it is probably LEDs as all my projects seem to have them.
The number of parts I buy is usually inversely proportional to the number of pins on the device.
I buy more 3 pin devices like transistors than 8 pin devices like op-amps and I buy fewer MCUs than 8 pin devices.
I buy even more 2 pin devices like diodes and LEDs than 3 pin devices. In a normal year I would vote for diodes and LEDs, but last year I bought more transistor switches.
How many people buy more LEDs than all other semiconductors put together?
My reply was by variety of part number, rather than the quantity I purchased (as sometimes I buy hundreds of a particular semiconductor device with the same part number, but guess you aren't interested in knowing that). So for me it is probably MCU where I purchase several of a device based on the peripherals I want and then I also buy the same device in a couple of other package styles.
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