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I have A current problem. I have this circuit and if it helps, look at it but if its intimidating, keep reading because I want something that will increase the sensitivity of a pin from the L6506 chip and not really to repair something in this particular circuit Im showing here.
Here I present what I tried already and the results I get.
All this experiment Im doing here is for this part of the IC; ---specifically--- that 10k POTentiometer.
The entire cct is powered from 5V, from 2 power sources. One for the logic cct and one for the motor itself. Both @5V. Ok?
In reality:
I put a 10K LIN POT and from it I could observe, a very slight deviation in current. At 5.0V, the maximum is 580mA (almost 600mA) when I remove the POT from the cct. It jumps to maximum like that. Its a good and fast way to check the maximum this way.
If I put back the POT and move from Max to Min, all the way, I can see a very slight deviation. The 580mA - actually this value is jumping around from 500mA to 580mA at diferent values, but I catch it a couple of times at 580, so lets say thats its maximum. When I rotate the POT down to its Min, I get around 400mA-again, very jumpy all the time so its hard to point precisely. Actually is fluctuating heavily between 360mA and 480mA; but staying somehow at 400. In other words, the Pot and the chip are functional ! But the sensitivity of this particular chip is very low.
- We must find an alternative way to increase its sensitivity. I am thinking using a transistor or an opamp. And somehow, make it go down to 0mA and up again to its maximum of 580mA.
- How to do that ?
The multiturn POT also at 10k, is also not working correctly. It worked somehow sometime ago, but not now anymore. Almost not at all and is very sensitive to touch. The amperage is fluctuating erroneously if im pressing (to turn it) of even holding it between my fingers and squeeze it a little bit. I get some very random results if Im turning even a bit. The most stable and linear was the LIN POT, but at very low sensitivity. Not doing much, in other words.
Thank you for reading and I bet there is a way with an opamp. Im not that good with opamps (yet).
Here I present what I tried already and the results I get.
All this experiment Im doing here is for this part of the IC; ---specifically--- that 10k POTentiometer.
The entire cct is powered from 5V, from 2 power sources. One for the logic cct and one for the motor itself. Both @5V. Ok?
In reality:
I put a 10K LIN POT and from it I could observe, a very slight deviation in current. At 5.0V, the maximum is 580mA (almost 600mA) when I remove the POT from the cct. It jumps to maximum like that. Its a good and fast way to check the maximum this way.If I put back the POT and move from Max to Min, all the way, I can see a very slight deviation. The 580mA - actually this value is jumping around from 500mA to 580mA at diferent values, but I catch it a couple of times at 580, so lets say thats its maximum. When I rotate the POT down to its Min, I get around 400mA-again, very jumpy all the time so its hard to point precisely. Actually is fluctuating heavily between 360mA and 480mA; but staying somehow at 400. In other words, the Pot and the chip are functional ! But the sensitivity of this particular chip is very low.
- We must find an alternative way to increase its sensitivity. I am thinking using a transistor or an opamp. And somehow, make it go down to 0mA and up again to its maximum of 580mA.
- How to do that ?
The multiturn POT also at 10k, is also not working correctly. It worked somehow sometime ago, but not now anymore. Almost not at all and is very sensitive to touch. The amperage is fluctuating erroneously if im pressing (to turn it) of even holding it between my fingers and squeeze it a little bit. I get some very random results if Im turning even a bit. The most stable and linear was the LIN POT, but at very low sensitivity. Not doing much, in other words.Thank you for reading and I bet there is a way with an opamp. Im not that good with opamps (yet).
