That’s my assumption. As long as you sell steppers spec’d such that the system will be unhappy at 2A, I’d avoid this like the plague.
On a system that can get covered in dust or put in a box? Don’t count on it.
Well the three most recent steppers I have sold (covers 7 years or so), 1.5A, 1.7A and 2A…so 120, 110, or 100mohm?? Feels like 110 is safe. ~1.80A RMS seems like plenty even for the 2A stepper?
Sucks cuz I just put in 100m in to easyeda.
Bummer, that is a sizable cost savings.
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Yes, using a FET that way to prevent blowing up the board with reverse voltage is REALLY smart.
Best part, when that FET is on, it’s a very low loss, far better in my opinion than the old diode bridge way of doing this.
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I will add it now, thanks for the input!
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I could use a second set of eyes. I see a discrepancy in my esp32 vs Barts’s Corgi.
The issues circled in yellow, And the logic chart is included.
Here is Bart’s.
And from espressif direct.
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It was a confirmed mistake.
I quite like pluggable headers, as you can connect the wires to the plug (generally a screw terminal) and then plug into the header on the board.
These are potentially good for power as they are mains rated, but there are quite a few variants of these on the market.
https://www.dinkle.com/en/terminal/2ESDV-XXP
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The issue with pluggable headers is I have to buy them separate. I can not find a way to get jlc to make the board and add the plugs, so that is another inventory item, another shipping charge, and another thing to assemble.
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They don’t have a concept of DNI (Do not Install) when kitting for assembly? That isn’t terribly uncommon for board contract manufacture (at least for commercial board assembly)
Not sure, I am still learning so much. Any time I have needed plugs I just order separately.
Jim any tips on the high side switching for the mosfets. There is a lot to learn there.
What we have, with this mosfet, AO3402 | Alpha & Omega Semicon | Price | In Stock | LCSC Electronics
Can I use one p-type mosfet with selectable voltage
Or am I going to have to have a mosfet circuit for each voltage?
Something like this,
Vgs is 1.3v so even a 5V source would give us 1.7v difference. It should work for both?
CJ3401 | Jiangsu Changjing Electronics Technology Co., Ltd. | Price | In Stock | LCSC Electronics 30V 4.2A, seems good?? Plenty of temp overhead?
I am not sure what the 1k resistor does but seems they all have it??
The 1k is a current limiter, I believe.
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Right, I had read that somewhere, thank you!
Any idea if the rest would work?
Whether it would work is a question for @jono035
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I think most all of the components are on the new test build. I just checked the numbers. The fully on integrated jackpot is 32% less than the current jackpot plus no assembly and 1/3 the inventory to deal with. I have not added in one item yet but I need to find prices, and a couple jumpers. So in the end the cost should be about 30% less.
So a large potion of the price is programming and testing so the new board would not be 30% less but I do hope to drop it some.
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My advice to you is to keep the retail price the same and correctly market with a statement the enhanced new jackpot added features while keeping the price the same.
You are putting good work in. Jake some just rewards.
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Yeah, I kinda agree. In the end it will only save the user a few dollars, but it will save me time on my end or on the manufacturing end for full kits.
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Jim don’t hate me…currently I am not using JST’s 