Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.
I did not look at your code in detail nor do I know if you are having other hardware issues but what stands out to me is your usage of fscanf to read a sequence of raw binary data coming in the port (0x01, 0x02, 0x03, and so on). I will assume that data is in fact arriving at your PC intact...
I have a 120VAC -> 24VDC power supply rated at 85% efficiency, and a 0.8W power dissipation with no load.
The device it is powering draws 110mA max = 2.64W.
I want to find a reasonable upper bound for the AC current draw and heat dissipation. Do the following calculations make sense:
2.64W DC...
Sscanf won't process the data until the terminator character (which you can specify) arrives on the line. Either make sure your device is sending the expected terminator character as necessary, or change the terminator character to something else. That's the easy first thing to check.
Failing...
I need a rail-mount terminal block to run a local DC ground to one side of a number of relays, for use with a dry (ground/open) digital input module. One terminal to power supply ground, the rest to relay contacts.
Should the terminal block be orange (data collection), blue (safe DC), or green...
I wasn't paying attention again and missed your clear +-12 -> +- 18 comment. My comment was based on the assumption that you only wanted -18. It is clear to me now that you are intending to boost 24 to 36 and also keep the center 0V points the same.
Yes, a voltage divider can only decrease...
A GSM modem, wifi on each end with an access point and use the internet, a satellite modem such as **broken link removed**, smoke signals. Can you be more specific about your requirements?
Why did you reverse the polarity of anything?
Replacing 0 and +12 with -12 and 0 doesn't change any relative polarities, it just shifts the 0 point and subtracts 12 from the numbers you previously saw.
Making that replacement and leaving everything else unchanged will change the outputs to -12...
Just a quick idea: If and only if you don't require a common 0V reference with the computer, just hook your ATX gnd to the +12 input of this circuit (unmodified), and your ATX -12 to the ground of this circuit.
Then the +18 output of this circuit becomes your new ground, and the ground of this...
Re: Small problem- bad thing
I can't offer any advice about the power supply but check the fuse in your DMM, replace fuse if necessary. Details will be in the manual.
4mA - 20mA is pretty standard.
How much current do you need? What signal frequencies are you dealing with? What line voltage drop / resistance are you expecting? You need to give more details.
You can easily make a current loop transmitter from op amps, etc.
If you can purchase from Kemet instead they have free software that generates models for all their capacitors (Kemet only, though): **broken link removed**
You might be able to find some info about creating a model here: **broken link removed**
And also: **broken link removed**
There are some...
I am referring to the maximum time step simulator option, which in multisim is the TMAX option described here: **broken link removed**
Try setting it to e.g. 1usec (1e-6).
It is probably a simulator issue assuming your circuit is built correctly.
Post your circuit so we can see resistor...
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
