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Surge protector T2+T3 Hakel HSA-275/4+0 M has following function diagram in it's datasheet:
At lower side there seems to be schematic symbol for something resembling varistor. But what is the thing on top?
Switch with something that looks like greek cursive letter "theta".
Any idea what...
Thank you for ideas. I will surely go through them one by one.
Just wanted to give you more insight into the project. This is not really meant as circuit breaker for short circuit protection. I am not sure if one can even build safe circuit breaker with proposed components. Proper circuit...
So i've done few modifications...
1.) added capacitors on voltage lines
2.) added RC filter between comparators, so i will be able to filter out inrush surges
3.) diode signaling active relay is now driven by relay transistor, because the comparator output is rather weak and i wanted to provide...
I know what signal is to be expected from AC712, but i don't understand how the first comparator would be always triggered.
I took freedom to ignore negative half-wave and only trigger on positive half.
Lets say:
1A = 2.6V
0A = 2.5V
-1A = 2.4V
when i trigger at >=2.6V i don't see how it can...
Hello
i've designed following circuit, can you please help me review it and pinpoint possible problems?
It is Mains AC relay that is going to be controller by microcontroller. It allows to switch the load on and off. As well as measuring the load current.
It provides overcurrent protection...
I was originaly to include some generic relay footprint and source it localy. But it seems that every relay manufacturer uses custom footprint as some kind of vendor-lock-in strategy... Are there in fact some standartised relay footprints that i can use to be sure i will be able to source it...
Hello,
i want to make simple board for switching several AC outlets using microcontroller.
I am in Europe (240VAC, 50Hz, outlets usualy wired to 16A breaker).
I want to use this primarily for switching power to computers (ATX PSUs) and similar devices.
So far seems relatively simple.
The thing...
I've just checked the datasheet and the pinout section states the SPI configuration pins are shared and can be reused as GPIO after configuration. So that's perfect for me... (i don't need to occupy two SPI buses of uC, can use single one for both)...
Yes. I was hoping that uC in Slave SPI mode can pretend it's a flash IC to make things easy :-)
BTW does the FPGA need the SPI to be online after the configuration was done? Can i reuse the SPI flash pins of FPGA in my HDL code? I already need to use slave SPI for communication between...
Hello. I am working on project based around Espressif ESP32 uC and Lattice ICE40 FPGA. FPGA will do some heavy lifting and handle several buses, while providing uC with preprocessed data over SPI.
So if i do some changes in uC firmware, i may as well need to update FPGA bitstream on flash and...
Ha! Thanks for pointing this out. Actualy i've went through MAX24x chips before, but the landing pages that google found showed MAX232 block diagram instead, which confused me. But now when i searched whole datasheet it is actualy there.
MAX244-MAX246 series seems to be quite adequate for my...
Hello, i am working on FPGA project with 32 duplex serial lines and i need to do conversion to RS232 voltage levels.
MAX232 can handle 4 lines, which would mean to use 16 pieces of MAX232 IC (only rx+tx, no hw flow control).
I wonder if there is similar IC which can do more lines in single...
Haha so true. I've already started looking. I like ICE40 and ECP5, they seem to have nice opensource toolchain available (yosys+nextpnr + icestorm or trellis).
https://www.youtube.com/watch?v=P-9WCFi0p-0
Looks to me much more likable than the traditional 5 or more GB proprietary IDE bullcr*p...
Didn't knew about this possibility. I will surely look it up. I don't think it's possible on all the devices that i need to connect, but i might be able to use it to simplify my daisychaining protocol.
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