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It seems like the requirements on this will be highly local-code-dependent. So, I'm leaning toward using a pair of 25A breakers. Then the installing electrician can add anything on the line side to make it compliant. LionelHutz (love the name btw) you ask a good question, what standard am I...

Thanks waross! So, you think I should use 2 breakers, one to power each unit? I figure that makes sense. Then upon installation at the customer's location, the electrician can install a separate disconnect or 50A breaker, based on local codes. Or do you think there should be a 50A breaker first...

I should note that it seems likely this will be a product that will be hardwired and bolted to the floor in an industrial environment. I'm not sure if that matters, but I wanted to add a bit of context.

I'm working on a battery charger module. It will include within it, qty 2 of MeanWell DBU-3200, connected in parallel at the AC input and DC output, powered by 220VAC. https://www.meanwell.com/Upload/PDF/DBU-3200/DBU-3200-SPEC.PDF The spec sheet says AC current typical 17A, inrush current...

IRstuff, point taken about the Arduino solution. It wouldn't be that bad. SparWeb, thanks for the questions and comments. The input is from a 24VDC nominal battery, which might range between 20 and 30V. So the circuit must respond to anything in that range. It's okay if it also responds to...

Thanks for the note. I did consider going the microprocessor route, but I feel like that puts this project a good bit out of my comfort range. Thanks for suggesting the OR gate rather than diodes. I've never used a gate before. Shows how green I am in this realm.

I'm looking to make a circuit that takes a 20-30VDC input and, when that goes high, generates a signal that also goes high, but to a different voltage (2-10VDC). Then after some time of being high, I want it to transition to a 600Hz, 50% duty cycle PWM. I'm thinking of a monostable 555 and an...

My plan is to use a lower power ICM7555 and run it off of the 5V control signal. That way there will be no draw on the battery when off and fewer parts! Just needs an RC filter on the trigger to keep it low for a while at startup then bring it high before the timer runs out. Thanks for the help...

Thanks for the reply. I think I understand what you're saying. I don't want to put a drain on Vbat when the 5V control signal is not present, so that is what I was attempting to do.

I just found this circuit that might simplify what I was trying to do, but still uses the 555 concept. http://www.learningaboutelectronics.com/Articles/555-timer-delay-before-turn-off-circuit.php

We have a circuit where a 5V control signal is used to turn on a MOSFET. I'd like to add a circuit in between here that, when the control goes high, the output signal that our MOSFET controls goes high for a prescribed amount of time (~5s) then goes back low. I have a circuit drawn that I think...

Just as a follow up, I've been using KiCAD for a few months and it's been great! Super easy to use.

I love that EEVBlog for many reasons. Thanks for the tip! I'm starting with KiCAD, and once I get comfortable with that, I'll give Altium a try when I need to. Thanks everyone!

I've used Eagle once, some 10 years ago. That is the extent of my PCB design experience. I'm looking to do a simple board now (maybe a dozen components or so, 3"x4", hopefully 2 layer) and I wanted to see if anyone had suggestions on what software I could use. The EE that has since left here...

I removed that inline 1.07k resistor, R52, and took a few more screenshots. With that 1k replaced with a 0Ohm, all looks well as far as I can see. 05 is directly from the PCB, just a few inches away. Nice and clean! 06 is directly from the PCB, 10ft away with a Y cable. I'd say, qualitatively...

I appreciate the feedback. The 5V we are using in this application is the onboard 5V, same as the source that powers the "level shifter". I have no idea why that large series resistor was chosen. I could remove it and place a 0 Ohm or 10 Ohm and see if that helps. I did get out the scope and...

I let this linger out there, but I wanted to post back about what I found. I didn't end up scoping the signal, but I did find something interesting. When the Y comes off of our board and drives parallel LED strings, all hell breaks loose. BUT... when I connect a single LED to the PCB, then put 2...

Thank you all for the feedback. I certainly don't understand how difficult it can be to diagnose and correct these types of problems, so this could be quite a struggle. I'll look at the voltage at the end of the long run, and we do have a scope, so I can look at what the signal looks like. But...

So, I'm an ME in a role that forces me to act as an EE sometimes. This is one of those times, and I'm lost on this one. We have a PCB that drives a Neopixel LED string. We have a string of 6 LEDs on a cable that is only a few inches long. All is well with that setup. They want another LED...

Thanks for the reply. I really don't know what the I2R losses are in the system. We could configure the battery either way with pretty minimal difference in price and availability. We're consuming 2-3 HP at 24V, so by that rule of thumb, we're good. I'm not sure if that would apply here very...