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Do-It-Yourself (DIY) Question & Answer Forum
Any Electronic Buffs On Here! Help!
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<blockquote data-quote="apprentice87" data-source="post: 331223" data-attributes="member: 13534"><p>Hi Steps,</p><p></p><p>Yes, that is right what you are saying, have a look at the wiring diagram for the other machine i have just linked to, and you will see that this is wired exactly the same was as mine, except it has some more wire, and a three pole changover switch [instead of a 2 pole like i got] so you can control arcforce too! The switch just bypasses the internal pots and connects up the external ones like you are saying! Bear in mind as you will spot a difference between the two diagrams, as on the one for my machine, terminal 3 of J1 is shown as going to terminal 3 on the PCB. It does not, it goes to terminal 6 as is shown for the "other" machine!!</p><p></p><p>john</p><p></p><p>Hi Steps, that is what i am worried about... It is shown as a 2k2 pot, when i "took the back off" it IS a 2k2 pot, so i am worried about using a 4k7 one, as the set makers did not decide on a 2k2 one for reasons of fun!!</p><p></p><p>I did have this idea.... If you use a bigger pot, for a given load impedance you will have a bigger volt drop. If i measure the "input to the pot, and then measure the feed to the PCB when it is "turned right up" if the wiper output from the pot is the same as the input across the pot, the can i assume that the load is of very high resistance/impedance and thus all will be fine??</p><p></p><p>john..</p></blockquote><p></p>
[QUOTE="apprentice87, post: 331223, member: 13534"] Hi Steps, Yes, that is right what you are saying, have a look at the wiring diagram for the other machine i have just linked to, and you will see that this is wired exactly the same was as mine, except it has some more wire, and a three pole changover switch [instead of a 2 pole like i got] so you can control arcforce too! The switch just bypasses the internal pots and connects up the external ones like you are saying! Bear in mind as you will spot a difference between the two diagrams, as on the one for my machine, terminal 3 of J1 is shown as going to terminal 3 on the PCB. It does not, it goes to terminal 6 as is shown for the "other" machine!! john Hi Steps, that is what i am worried about... It is shown as a 2k2 pot, when i "took the back off" it IS a 2k2 pot, so i am worried about using a 4k7 one, as the set makers did not decide on a 2k2 one for reasons of fun!! I did have this idea.... If you use a bigger pot, for a given load impedance you will have a bigger volt drop. If i measure the "input to the pot, and then measure the feed to the PCB when it is "turned right up" if the wiper output from the pot is the same as the input across the pot, the can i assume that the load is of very high resistance/impedance and thus all will be fine?? john.. [/QUOTE]
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