[image] RC3…this could change.

[image] Jono: Mechanical contacts are tricky like that. Good point. All switches including relays, specify a minimum switching current. (“Cleaning current”, or “Wiping current”.) I have intesnse misery in my past life from someone else that designed a system that used a double pole double t…

[image] MakerJim: All switches including relays, specify a minimum switching current. Sadly, I wish that were remotely close to true. In my experience very few do, but all SHOULD.

[image] Jono: but all SHOULD. That’s what I should have said. They all have the limitation, but many (Most?) don’t put it in the data sheet.

Yeah, which then makes it a wonderful thing to try to design around and a great point to argue with people about. There’s a reason why relays with gold plated bifurcated self-cleaning contacts exist, otherwise we’d be using big cheap tin-oxide button contact power relays for everything. Edit: Adm…

[image] Jono: I’ve gotta bail out for a few hours, but hopefully that’s a starting point to work from. Thank you as always. [image] Jono: having a moderately fast buffered TTL output What is to gain from this vs just using the jp1 mosfet for the 5v pwm/ttl?

[image] Ryan: What is to gain from this vs just using the jp1 mosfet for the 5v pwm/ttl? Can we just select the pull-up value we need and feed it into the buffer, 5v or vmot? then is still needs to be able to handle more amps right? [image] Jackpot config changes This may or may not be he…

[image] vicious1: Can we just select the pull-up value we need and feed it into the buffer, 5v or vmot? TTL= 5V logic output, limited current drive capability. But having a buffer in front of the existing V2 circuit would let you have all three outputs be laser capable, at the cost of an add…

We can get rid of the first mosfet and drive the other one directly? The first one is just there to level shift if I remember that right. That should gain the speed back. What would the extra headers be for? Or, are you saying have each output split into both 5v and vmot, each with it’s own termina…

[image] Ryan: What is to gain from this vs just using the jp1 mosfet for the 5v pwm/ttl? Oh, more just for logic stuff I don’t like doing open-drain unless I have to, I prefer driven high/low, etc. It does depend a lot on what you want to do with the output, if it’s just something like PWM c…

So, I don’t know if this is the place but this is the design process I try to follow, roughly speaking: User stories - This is the first step and can be a valuable tool when dealing with clients who don’t have a lot of domain-specific knowledge but can also help when mulling things over yourself. …

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Jackpot V2

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