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Thanks for all of the helpful suggestions! I guess it makes sense that the capacitance is the culprit: the noise also disappears when I stop switching the coil. I wasn't really aware that the effects could be so macroscopic, but I gladly stand corrected. I have yet to try adding a shunt diode...
mrinalmani, thanks for the suggestion, but there didn't seem to be much effect. I was still getting about the same amount of noise (LOGGER6.txt) The coil is admittedly quite close to the board (~2cm from the edge, ~5cm from the op amp), but could it cause that much noise if nothing magnetic is...
Hmm... I see what you're saying, but even if it is switching, wouldn't both high and low output levels cause the ADC to see 0V? I guess I don't understand where any positive voltages could be contaminating the signal to the ADC.
Sorry for my lack of transparency. Originally, this circuit was...
Hi there!
I have an op amp acting as a comparator (which might not be too ideal) comparing ground and an inverted signal from a coil that, when nothing magnetic is moving near it, is pretty close to ground (±1mV or so). I'm using this comparator (Vcc=7.4V from the +ve terminal of a battery...
Thanks for the quick response! Both the supply and the gate drive should be at 7.4 volts, since I'm driving the gates with a TC427. As for the 15V issue, I never really noticed that to be honest :P. Could that really be an issue? I don't know whether saturation characteristics are applicable in...
Hi there,
I hope I'm posting to the right forum about this. I am building a DIY brushless 3-phase speed controlled for my RC plane. To do so, I have constructed a circuit involving 6 pairs of RFP30N06 MOSFETs arranged in totem-pole fashion – each pair being driven by a TC427 dual MOSFET driver...
Hi everyone,
I hope this is the appropriate section to be posting this to 8-O
This is my first post and I'm really noob at electronics so I apologize in advance for any outstanding stupidity :-D
I've been looking everywhere to find a solution but I've always come up with nothing [thats a cue...
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