Just a little background I have made guitar pedals and circuit boards in the past and am comfortable working with them. SO I was thinking about making a vv mod which also reads ohms based on a design I found on you tube but I have a couple of questions for you guys.
1. first off I understand ohms law, but I cant rap my head around how the diagram in the first picture leads to a current of 1 amp so that resistance= voltage. wondering If you use the pot to calibrate it and then it will be accurate but not sure. If anyone has some insite that would be very helpful.
2. I dont understand why 2 switches (SW1A and SW3) are needed since there seems to be only 2 functioning positions (both up in relation to the page orientation for ohm reading and both down for voltage) for this reason I have modified it (see bottom right of picture) to use 1 3PDT switch. Is my assessment accurate? Also, I think I could add a red led between pins 1 (+) and 7(-) to indicate ohm reading and a green led between pins 3 (+) and 9 (-) to indicate voltage.
3. Since I plan on using this at home I plan on using a wall outlet for power and leaving the screen on so I think I can remove the momentary sw2 switch (or make it an on/off switch so I can shut off or leave on the screen at my discresion) and putting a momentary switch on the + lead of the 510 connector for firing the device (I actually have a reason for doing this but I will not bore you with the details) Can I do all that?
Thanks for your help,
Joe
if the pictures aren't clear can anyone help me make them bigger? Or I guess I can email them to people.
1. first off I understand ohms law, but I cant rap my head around how the diagram in the first picture leads to a current of 1 amp so that resistance= voltage. wondering If you use the pot to calibrate it and then it will be accurate but not sure. If anyone has some insite that would be very helpful.
2. I dont understand why 2 switches (SW1A and SW3) are needed since there seems to be only 2 functioning positions (both up in relation to the page orientation for ohm reading and both down for voltage) for this reason I have modified it (see bottom right of picture) to use 1 3PDT switch. Is my assessment accurate? Also, I think I could add a red led between pins 1 (+) and 7(-) to indicate ohm reading and a green led between pins 3 (+) and 9 (-) to indicate voltage.
3. Since I plan on using this at home I plan on using a wall outlet for power and leaving the screen on so I think I can remove the momentary sw2 switch (or make it an on/off switch so I can shut off or leave on the screen at my discresion) and putting a momentary switch on the + lead of the 510 connector for firing the device (I actually have a reason for doing this but I will not bore you with the details) Can I do all that?
Thanks for your help,
Joe
if the pictures aren't clear can anyone help me make them bigger? Or I guess I can email them to people.
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