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  1. HarryA

    For Sale: Motorola Testing Equipment Lot

    If I lived near Detroit I would grab these. They would look impressive on my bench :) They are pickup only - no shipping. Auction ends 1/30/2019 https://www.shopgoodwill.com/Item/63022552 One could buy the lot and sell each on ebay.
  2. HarryA

    Wanted: electrical ferrules

    Made my own by chemically milling a larger wire and using a butt connector. It's not worth the effort.
  3. HarryA

    Comedy Thread

    The only had one job - and did a good job. How I received 6 transistors. Missing is the 10 feet of brown paper.
  4. HarryA

    Wanted: electrical ferrules

    I just soldered five small wires on the end of transformer leads so I could plug them into a solderless breadboard. It would be great if there are crimpable ferrules that would take the larger wire and the other end fits into the breadboard, The ones in the photo crimp on the small thus they...
  5. HarryA

    Light sensor motor control

    You may find the circuit in the first photo helpful. It is marked with the components I used in the prototype in the second photo. I used two 6 volt motors in lieu of one 12 volt motor.
  6. HarryA

    Light sensor motor control

    I learning to use the LTspice circuit simulator so this is a good project to practice on. So when the light sensor senses the light its output goes from 0 to 12 volts. Then the output of the 555 timer at pin 3 goes low. Thus stopping the motor. When the operator presses the switch the output...
  7. HarryA

    Light sensor motor control

    In the first photo is a circuit that maybe helpful. It works in the simulator as best I understand your requirements, If not we can make changes until it is what you need, In the photos the n numbers reference the pins as pin2(trigger), pin3(output), and pin4(reset). The mosfet is just one I...
  8. HarryA

    Light sensor motor control

    So: 1; On start up: light off = motor on = pin 3 latched high 2: light on = motor off = pin 3 low 3: sw on = motor on = pin 3 latched high 4: the motor on for 2 to 4 seconds and pause for 3 to 6 seconds - is independent of the latch: The latch "allows"...
  9. HarryA

    Light sensor motor control

    Are you using the 555 as a latch?
  10. HarryA

    Whirligig with LEDs

    Howdy from Penn's woods. In the photo is a whirligig with a double (4 wires) length of LEDs along the edges of the blades (from a ceiling fan). The whirligig has been in operation since December 2015 with the original batteries. The "wing span" is 4 ft/1.2m. The LED circuits has one length...
  11. HarryA

    the twelve days of christmas?

    in this one it is easier to see the gifts go up and the days go down. Private Sub Command1_Click() Dim days As Integer Dim gifts As Integer Dim sum As Integer days = 12 For gifts = 1 To 12 Step 1 sum = sum + gifts * days days = days - 1 Next gifts Text1.Text = Str(sum) End Sub
  12. HarryA

    the twelve days of christmas?

    that works: Private Sub Command2_Click() Dim gifts As Integer Dim sum As Integer For gifts = 1 To 12 Step 1 sum = sum + (gifts * (gifts + 1)) / 2 Next gifts Text2.Text = Str(sum) 'sum = 364 End Sub
  13. HarryA

    the twelve days of christmas?

    Yes but you did not show how to calculate it - so no credit. I was wrong it is not the sum of gifts and days but the product: sum = sum + (gifts++ * days-- ) day gifts days 1 1 12 = 12 2 2 11 = 22 3 3 10 = 30 and so on but what is the...
  14. HarryA

    the twelve days of christmas?

    Greetings from Penn's woods. How would you calculate the number of gifts in the song "The Twelve Days of Christmas" ? I would think it is the sum of gifts+days as gifts goes from 1 to 12 and as days goes from 12 to 1. That is as far as i can get. You do not get any credit unless you show your...
  15. HarryA

    5x7 pcb enclosure?

    How about a 58mm x 83mm X 35mm ? Has a cute little tab for hanging it up and free screws. Only 1.46 ! https://www.ebay.com/itm/83x58x35mm-New-Waterproof-Plastic-Electronic-Project-Cover-Box-Enclosure-Case-/291813529388
  16. HarryA

    Energizer CHPROWB4 Project

    You need to define the "charger" then someone can help you.
  17. HarryA

    How an electromagnet can calculate kilogram

    "In this new application, the balance will be used in the opposite sense; the current in the coils necessary to support the weight of a standard kilogram mass will be measured, "weighing" the kilogram. The weight of the kilogram is then used to compute the mass of the kilogram by accurately...
  18. HarryA

    How an electromagnet can calculate kilogram

    "The new system, now that it's been adopted, will allow anyone with a Kibble balance to check their weights anytime and anywhere" Anywhere? There must be more to this balance then they say - does not gravity vary all over the planet? see: https://www.bbc.com/news/science-environment-46143399
  19. HarryA

    Help measuring resistance of fuse with this multimeter

    I have done a lot of automobile repair and never measured the value of a fuse. I have removed fuses and measured the resistance at the terminals that the fuse resides in on the automobile.
  20. HarryA

    HP8640 Repar

    for the hp 8640 signal generator? see: https://www.ebay.com/itm/Brass-Gears-for-the-HP-8640B-Signal-Generator/153024403695?hash=item23a0f718ef:m:mdnWviPMmNrHQDw1oaTPpww:rk:1:pf:0
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