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I'm working on a board for the raspberry pi compute module I'm trying to add a POE switch the board, anyone has a starting point what IC and how to design the sensing and the power.
It looks like the question was posted previously but no good guidance yet
Thanks in advance
Either one should work, I'm looking for something sample.
Can you guide me where to look at both options and what's the difference, advantage and disadvantage
the story is that we have a NiMH batteries that have a discharging current rated for 0C to 70C. those batteries are just backup power not the main power, we need to keep them warm in the cold winter, so now we have to sense the temperature of the device and trigger the heat mechanism if are...
looking for a simple circuit to generate heat to keep my device inside an enclouser abouve 0C, in outdoor application winter time.
I'm thinking about a resistor and MOSFET controlled by a GPIO of a proccessor.
I approciate your help in advance
I like to share this circuit that is very common to drive a transmitter with high voltage, presumably I suppose to get a long range using this but I'm only getting about 1m.
I'm not looking at 360 degrees at this moment I should fine with 60-90 degrees.
I agree with you on guiding the signal using a parabolic dish, however, in my application I like to have a 360 cover so the receiver on any direction will capture the pulses. I could use multiple transmitters, but still I may not get the range of 20m. Any circuit proposal or approach?
Hello,
I'm struggling with finding the right circuit for very long range ultrasonic transmitter. If anyone have any approach I previously used 555 timer and transformer to get a 100V pules still not getting the desired distance of 20m.
Thank you in advance
Dino
Hello all,
I have several input voltages going to supply a other circuit (any of the these put could be on randomly). i'm note adding them (the circuit still support the total voltage as well). I'm using diode to protect in feedback and the output will have a voltage in the case of one of them...
Your response is good:
The timer output is fine outputting a square wave at 5V. The timer by itself can drive the transmitter with no problem. However, when I try to load the transmitter to a NPN start having this issue, because I need pulses at 30V for long distance. The PNP has a max 6 Volt...
Hello All,
I made typical ultrasonic transmitter based on 555 timer, and because needed to boost the signal for long distance I have to drive the transmitter with high voltage (up to 40V from the datasheet). for that used a NPN transistor that can handle the 40V. Now, I'm having the issue that...
Hello All,
I'm working on a ultrasonic transmitter and receiver I need to use some sort of modulation and demodulation.
anyone has an idea where to start from, some datasheets for some ICs that I can learn about.
Thank you in advance
Hello All,
I'm trying to design a Ultrasonic Receiver, I have used one of the comment circuit available online. I'm having an issue of swing; the output looks amplified but doesn't really swing rail to rail or at least around zero. I have attached the circuit and the simulations. I should be...
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