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I've managed to find someone who has done what I'm looking for, so just to close this off I'll post the link if anyone else is interested.
https://stackoverflow.com/questions/13125096/bluetooth-le-profile-for-reading-measured-data/13130920#13130920
Just wondering if anyone has any experience with using private services/profiles for Bluetooth Low Energy and connecting to an iOS device (iPhone or iPad). I'm led to believe this is possible but I can't seem to find anyone that is doing it.
According to this documentation from Apple, it seems...
Thanks for your response. I forgot to mention we are using PWM to control the position. I want to avoid the flyback diode because it complicates some protection circuitry we have for reverse polarity in our product.
So what I'm getting from your response is that you don't see a particular issue...
As the topic suggests, I would like to drive a proportional solenoid valve without using a flyback diode and looking for some industry experience/feedback.
First off, I'm using an off the shelf "smart" low side driver (ST Micro VNL5030J-E) which has the necessary avalanche rating for this to be...
Thank you, both of you have provided some good insight and ideas for testing.
It may be difficult to maintain cleanliness over a long period of time. The PCB will be housed inside an enclosure with fans, so maybe I have no option to avoid conformal coating not only for this circuit in...
10 M-ohm
0603 SMD package
90% RH, non-condensing
< 5V working voltages
I'm not sure what to tell you about the PCB, the board will be professionally constructed, assembled and cleaned.
Hello,
I was wondering if anyone could point me in the right direction for finding some quantitative analysis done regarding surface currents as a function of relative humidity.
My concern stemmed from a circuit design which uses a 10 M-ohm resistor in humidity levels up at 90%. Will surface...
Thanks to both of you for clearing this up.
I was getting confused as to whether having the input signal a current source changed anything in terms of beta.
Hello Guru's,
The circuit in question is a basic op-amp current-to-voltage converter with feedback resistor placed from output back to inverting terminal. signal current also connected to the inverting terminal and non-inverting terminal is connected to ground.
I remember back in school that...
This is starting to make sense. Okay, let's say we have a current input of 1uA for the circuit in the datasheet (1Mohm gain). I would expect to see +-1V on the output (depending on input polarity). Now the inverting input terminal voltage should be 58dB down from the output as you mentioned...
Hi Keith,
Thank you for your reply. The thing that bothers me is if I replace the current source input with a voltage source in series with a 1-ohm resistor then I am now limited by the GBP of the op-amp. I don't understand when directly working with a current input that things all of a sudden...
Hello Guru's,
I have been trying to wrap my head around some transimpedance amplifier basics and there is some things that trouble me.
Referring to TI's OPA655 op-amp datasheet (**broken link removed**)
The first page shows a bode plot with transimpedance gain. Two things I would like to...
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