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Hi all, the reason is drilled holes activation: the standard way to make conductive holes is to drill them on a blank board, then "activate" (get them to have some conductivity) the internal surface

what is the reason ... process....? to use Calcium Hypophosphite when home brewing a PCB?

Hypophosphites can be used in the manufacture of methamphetamine and some other controlled substances requiring similar reactions, so it's hard to get in the USA. No telling what you'll get from

Hey Terry Gray? You can source Calcium hypophosphite from China / Chemical suppliers..

Does anyone on the list have access to Calcium Hypophosphite?? This stuff is impossible to find in the US, being a "controlled substance".? For crying out loud. I really can't see the point

Jim, I originally used a Silicon Horizon reflow oven controller board which cost around $75. I tested it and then put it up on a shelf until I got around to track down all the remaining parts to do

Thanks. By the way, I just ordered a reflow controller from Rocket Scream who just got theswe back in stock. A lot of bang for the buck. Full schematic, design files, user manual

You do not want to use a relay (EMI), but an SSR with crossover detection, also called zero voltage switch. I? use my own PWM method by enabling X periods over a one thousand period timeframe. 1000

1k to 10k is common, for relays

Does anyone have a feel for the maximum update rate is that would be required to drive a standard contactor/relay from a pid controller interfacing to a toaster oven? Thanks, Steve K1RF

There was a note from Adafruit just a few months ago about a Reflow Oven project based on their Micro-Python board (can't remember the name of it) along with source code (again Micro-Python).? The

A good thing to keep in mind is that, where a contactor/relay rated at 30A will run just fine at 15A with no special effort, a 40A SSR will require a large heat sink and possibly forced air cooling,

Here's the manual for my Inkbird ITC106VH? (covers other models too) https://www.ink-bird.com/products-PID-controller-itc106.html They have models for energizing external relay coils @ 12-24 and

The ones intended for 3D printer hot-ends should be ok as they run at 200-250C. However… As you say, read the specs. The 3D printer ones have Teflon insulation which is nice, but that

I don't know if 3950 is a generic term, or what, but Adafruit lists what they call an "3950 NTC" thermistor that is a 10k, max 105C with epoxy coating and vinyl wire. So read the specs of what you are

Hey Brent, sorry for the slow reply. Thanks for all your compliments! Some initial thoughts from my experience with the scriber, and the pressure issues you've faced: I ended up using a spring from a

This is the Pid controller you want. High quality and function

The picture didn’t come thru, but the usual aluminium-backed boards that most 3D printers use are only meant to be run at 100C-ish. I think maximum is about 150C for that stuff. The silicone

Has anyone played with 3D printer heat tables for SMD ? The PCB are aluminium backed, so that sucks out any heat if you try to use a soldering iron, or even a hot air gun at times. You’ve been

Yeah, they’ll work. I was thinking of 10K thermistors for some reason. Don’t forget your lookup table. Tony Sent: Wednesday, 3 June 2020 12:35 PM To: