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2021-02-12 3:13 pm
@robotbuilder - it is amazing to identify what a circuit is for, just by looking at it. I could never ever have even guessed anywhere close.
Life is exploring and learning
YurkshireLad reacted
2021-02-12 3:15 pm
Agreed! I'm in awe of anyone that can do this.
2021-02-12 5:16 pm
@titch_stewart
@robotbuilder, thank you again. Is that any of those youtube channels you'd recommend?
No sorry I just remember seeing some utube tutorials that also showed circuits in action.
@yurkshirelad
R3 and C6 are tied to ground. How, therefore, do they affect the signal into C7?
The other end of the R3 is also connected to the positive rail via components inside the LM386. The signal at pin 5 is not a direct connection to the positive rail.
Ground is just a reference point in a circuit from which all other voltage points can be compared. In this case the reference point is the negative terminal of a battery. An electric force or pressure exists between two points when one point has more electrons than another point. Just like measuring the air pressure in a tyre. The tyre pressure inside the tyre is compared with the air pressure outside the tyre. It is called "ground" because often it was connected to the physical ground (earth).
This is a complicated circuit I don't fully understand. An explanation of how the LM386 is actually being used apart from providing amplification of the signal might be in the article that came with the actual circuit.
titch_stewart reacted
2021-02-12 5:20 pm
Be gentle - I'm a software guy! 😆
As a software guy have you ever wondered how your program works physically?
2021-02-12 5:59 pm
Be gentle - I'm a software guy! 😆
As a software guy have you ever wondered how your program works physically?
Actually, no. My work is so abstracted from the hardware these days that I don't need to. Like all s/w I work on these days, there are layers and layers and layers of software between me and the h/w. Good question though.
2021-02-12 11:22 pm
Be gentle - I'm a software guy! 😆
As a software guy have you ever wondered how your program works physically?
Actually, no. My work is so abstracted from the hardware these days that I don't need to. Like all s/w I work on these days, there are layers and layers and layers of software between me and the h/w. Good question though.
I don't need to know I have to know! I knew in principle how a computer worked long before you could buy a home computer and could have built a simple one if I had had the money. I had to know "how all things worked" from a very early age.
Thinking about reading a circuit it really comes down to recognizing configurations you have seen before. The complex circuits given are a variation on simpler radio circuits, amplifier circuits, oscillator circuits and so on that I have built in the past and the workings of which were explained in books.
titch_stewart and YurkshireLad reacted
Topic starter
2021-02-15 9:15 am
@robotbuilder @yurkshirelad in the early stages of my first job as a Software Engineer my boss, at the time, said to me that I'd be a much better Engineer if I knew how the machine worked. That really sparked an interest. I've read Inside the Machine which really helped from a high level (but lower than Software). My hope is that Jon Stokes does a follow up. I see getting to know electronics as an extension of that but that book really helped as a half way point.
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