Recent content by CalgaryPT

  1. C

    How to Mount LED Display in Cabinet

  2. C

    How to Mount LED Display in Cabinet

    Sadly there is no PCB (see pic). The wires are soldered onto the display leads and shrink wrapped.
  3. C

    How to Mount LED Display in Cabinet

    Does anyone have any good tricks on how to mount an LED (3x 7 segment) display in a project cabinet? It's a speed readout on a PMW speed controller for a automated plasma cutter I am building. My thoughts are cut a rectangular piece of semi rigid plastic, drill mounting holes on either side of...
  4. C

    Flyback Diodes

    Thanks everyone. I will likely add my own diode but the thread really got me thinking. I will try both these methods and see what kind of results I get. That's part of the fun for me.
  5. C

    Flyback Diodes

    I see your point, but do you think this test would be a real indication of diode being present though? (My decades old electronic knowledge is failing me perhaps.) The coil on each mag brake is 48.2 ohms, measured either polarity. So supposedly this means there is no diode across the coil. Yet...
  6. C

    Flyback Diodes

    Hi all. I am building an RC Lawnmower from scratch. It's almost finished and I am preparing to test. The motors are two 24VDC wheelchair motors. Traditionally people who build these remove the mag brakes from the motors. The motors are 250W each, and require 24VDC @ 30mA to each magbrake to...
  7. C

    Mounting Multiple PCBs in Rough Environment

    Thanks. I think I have enough suggestions now to solve the issue. A last trick I taught myself years ago was in vibration-prone environments to glue a rare earth magnet between the mounting plate and the project case. The idea here is to catch any nuts or bolts that do shake loose, thus...
  8. C

    Mounting Multiple PCBs in Rough Environment

    Good advice from both of you. I was looking at traditional standoffs but wondering if there was something new and improved that replaced them. I have used the plastic self adhesive ones as well as screw based ones, but a few of the boards are so small, it's hard to find plastic self adhesive...
  9. C

    Mounting Multiple PCBs in Rough Environment

    Hi everyone. I have a PCB mounting question. I am building a RC lawn mower. I have all the electronics working and am doing the metal work for the frame, drivetrain, etc. There are a lot of electronics: RC receiver, one LAC board for an actuator, two RC relay boards, one Arduino board, one...
  10. C

    Tapping 12V from 24V Battery Source

    Just thought I would update this post for other buck converter nubes. I ordered two but couldn't get the darn things to work. Of course the high quality documentation (i.e., NONE) that came with it was a total help. Anyways, after doing some research I discovered that buck converters only work...
  11. C

    Tapping 12V from 24V Battery Source

    I think the Matchbox option is the least costly of the two.
  12. C

    Tapping 12V from 24V Battery Source

    Thanks :) I have to admit originally I blew off your response when I saw the inductor and number of components on the board as I thought it looked pretty inefficient. My circuit knowledge is pretty good, but dated. So I wondered if you were to step it down why not use a linear voltage regulator...
  13. C

    Book Reviews

    Oh man, did you ever date yourself with that post. AND made me nostalgic at the same time. Thanks.
  14. C

    Tapping 12V from 24V Battery Source

    Hi all.... I am building an RC Lawnmower. Most of the HD motors are wheelchair gear type and require 24V. But some of the electronics I plan to use are 12V, for example the linear actuators. Can I tap the series connector line between the batteries for the 12V? I think this may be how it is...
  15. C

    Electronics Parts in Calgary, Alberta ?

    I agree -- I buy a lot of grab bags and bulk packs online too as the price is great. Resisters and caps mostly, but even some transistors too. But sometimes I just like to walk down aisles and look. Sadly, this is something we seem to be giving up as a consumer society for the convenience of online.
See more
Top