How can I identify re-used electronic components? I need help with a guitar amplifier circuit as well.
I want to make an amplifier based on the schematic in this instructable https://www.instructables.com/id/Make-a-Sweet-Portable-Guitar-Amp/. I wanted to add a power input jack so I left a comment on the instructable and the 'ibler replied and told me how to do that.
Now I am considering more possibilities, firstly, could I incorporate an led tuner? If so would it be best to just take a tuner apart and use that, could it share the same battery and mono guitar input jack?
Recently I took apart a cd player and salvaged two nice speakers, but they don't say how many watts they are they just say "QS" then "8Ω" and "5V". I don't think they will be suitable for this project anyway because they are 5v and I'm sure this circuit requires lower output voltages than that but i just thought i'd check. A label on the cd player said the power consumption for the device was 15W, can you work out the power of one of the speakers from any of this? Bearing in mind there were two speakers in total.
Another question, if I want to reuse resistors I know how to figure out their resistance using the colour bands and a resistance calculator etc. But is there a way of identifying what is a 1/4 watt resistor and what is a 1/2 watt resistor.