Search found 17 matches

by srw
Sun Aug 17, 2014 3:08 pm
Forum: Electronics
Topic: Plated Through Hole PCBs
Replies: 7
Views: 7157

Re: Plated Through Hole PCBs

I have a bottle of Ca Hypophosphite sitting right beside me. Now, I just need the Ammonium Hydroxide and some time to play.

Of course, I'll also need some sulfuric acid for the electroplate step.

I might also need some more bluestone... I don't have a lot.

Time. Mostly I need time.
by srw
Tue Jul 15, 2014 1:24 pm
Forum: Electronics
Topic: Plated Through Hole PCBs
Replies: 7
Views: 7157

Re: Plated Through Hole PCBs

Chemicals required. Russian Method: Copper Sulfate (bluestone -- available at Co-op Agro Store? Kills algae in ponds) Calcium Hypophosphite (on DEA list... tried ordering from China on Aliexpress. We'll see how it goes.) 25% Ammonium Hydroxide. (Prolab Scientific has 29%) Dish Soap. Electroplating s...
by srw
Tue Jul 15, 2014 1:12 pm
Forum: Electronics
Topic: Plated Through Hole PCBs
Replies: 7
Views: 7157

Plated Through Hole PCBs

A collection of thoughts that hopefully can form into a working process for PTH PCBs at Techworks. 1. Drill on Goliath. 2. Flash plate holes using "Russian Method" 3. Electroplate 4. laminate resist 5. print transparencies 6. expose, develop, etch 7. strip resist. 8. Tin Optional: 9. laminate solder...
by srw
Mon Jul 14, 2014 8:48 pm
Forum: General
Topic: Vending Machine
Replies: 7
Views: 8281

Re: Vending Machine

"Free" you say? I don't think the guys would let me bring another vending machine into the space, but the cold can bit is definitely appealing. On a related note: you seem to know a bit about the CoinCo mechs? What do you know about retuning one to accept the new loonies and toonies? (I think the on...
by srw
Tue Apr 15, 2014 11:42 pm
Forum: General
Topic: Robot group build / workshop
Replies: 17
Views: 17110

Re: Robot group build / workshop

Just for reference, the parts we used for my nephew are: http://www.robotshop.com/ca/en/dfrobot-2wd-mobile-platform-arduino.html http://www.robotshop.com/ca/en/dfrobot-arduino-compatible-motor-shield-2a.html an Arduino (Leonardo or Uno... can't remember) Plus three: http://www.digikey.ca/product-det...
by srw
Fri Nov 22, 2013 8:54 pm
Forum: Electronics
Topic: Reflow Oven
Replies: 0
Views: 6880

Reflow Oven

https://dl.dropboxusercontent.com/u/27075157/Oven-sm.jpg https://dl.dropboxusercontent.com/u/27075157/OvenControl-sm.jpg The reflow oven is probably working now. The picture above shows close to the peak temperature for a lead-free profile. Tin/Lead is about 20 degrees cooler, and I will reprogram ...
by srw
Tue Oct 29, 2013 10:36 pm
Forum: Electronics
Topic: Tesla Coil Madness
Replies: 6
Views: 10622

Re: Tesla Coil Madness

It was a great run tonight. Thanks for helping test my lightning detector.

Here's the video with the fluorescent tube.

http://www.youtube.com/watch?v=zsjR1r0tmsw