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Is there any difference between TL072S, which this amp calls
for, and TL072, which I also found in another amp of mine.....
I can only find TL072ACP IC Dual J-FET Op-Amp 8 Pin DIP
from a supplier, without having to order by the hundreds.....
are they equivalent replacements for one an other..?
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That should be fine... TL072 is the core of the part number the other letters can indicate things like packace (type and material), manufacturer temperature ranges... as long as they are in an 8 pin dip type package it will be fine.
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Some of my confusion is in the fact that voltage is the "potential push available" and current is the actual flow/quantity of electrons passing a given point at a defined time(Amps).
Ohm's law defines the relationship of these 2 factors relative to resistance, but I can't picture it at work in these amplifiers and schematic circuitry yet, despite continued research, but I'll keep plugging at it.
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Consider a tank of water, with a pipe coming out of the bottom. In this case gravity appears as voltage - the force causing the water to move
The amount of water flowing is the amount of electrical current.
That just leaves resistance.
Now the resitance can be approximated as the diameter of the pipe. The larger the diameter of the pipe, the LESS it RESISTS the water flowing through it and so the MORE CURRENT flows.
A tap is like a variable resistor, when you close it its internal diameter is effectively reduced, increacing its resistance and reducing the water current flowing through it.
Hope this analogy helps somewhat
Another thing o note is that Ohmss laws stated form (V = I * R can be re-arranged into 2 way with a little algebra;
I = V / R
R = V / I
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You may be able to "jog my mind" into the proper way to comprehend this. I've read stats and descriptions for all the components you mentioned, but the "big picture", making the relationships of the components is not coming through. How do the terms "signal flow" itself, differ and relate to Voltage, Current, and Resistance, from the output of the guitar through the preamp & power amp to the output to the speakers. Please try to paint me an image that will make this all start to click, even if just in a very general way, and then I may do better with my actual curcuitry and components research, and make the connection to how these components relate to the changes required to alter and amplify sounds through an amplifier. I apologize for mosty writing and less hands on, but a lot of this is done from my bed, and needs to work in my head, which is the most difficult part - acquiring the practical knowledge!
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Learning how to trace signal flow is not going to happen over night. you will need to be able to:
1. Identify the individual stages of the amplifier
2. Have a basic understanding of these stages
2a. Understand the principle of negative feedback
3 Recognise components that can be ignored.
4. Have basic knowledge of the individual components behaviour
If you really want to learn send me a Private message with your MSN address and i'll get back to you - note the time i will be able to give you will vary at time maybe a couple of hours a day, at other times a few minutes a week
I spent four years doing my degree, don't expect to pick this up overnight! perseverance wil be needed and probably some patience aswell