Search results

Search Forums New Posts
  1. hevans1944

    Air Pump

    So maybe you got a good deal on the pump, but just bad luck on the motor controller. All is not lost if you can verify that the pump motor still works. Maybe you can purchase a PWM controller from one of the many Asian sources available on eBay. What to get would depend on what kind of motor...
  2. hevans1944

    Air Pump

    Visit this link and tell us if the item on that page is what you have (ACO-9630 Air Pump). If so, send an e-mail inquiry to [email protected] (address at bottom of the linked page) and ask if the company will either sell you another pump, or another motor speed controller, or maybe both, mated and...
  3. hevans1944

    Old Resistors

    I don't think it's madness to cherish the really neat electronics from the (fairly) recent past... especially electronic musical instruments! I haven't been bitten by the Theremin bug yet, but there are plenty who have been, including many DIY Theremin builders. A bug that did bite me, but has...
  4. hevans1944

    I know nothing...

    @Traviskpshelton You should tell us what YOU are trying to DO. So far, all you have mentioned is a smallish 360 W∙hr battery rated at 36 V and capable of delivering 10 A∙hr of current into a 1000 W LED load. You wanted to know how long a fully charged battery would run the LED lamp load...
  5. hevans1944

    Reversing polarity

    Sounds like it was going in the wrong direction when it hit the limit switch. In other words, it should have been going in the opposite direction and hit the other limit switch instead. If it didn't reverse, then the top relay was not energized by the NO contacts of limit switch LS1 and actually...
  6. hevans1944

    Oscillating reed switch

    Hmmm. So you want to disconnect the flow meter, which contains a reed switch that closes and opens in response to flow, and replace it with "something" that will simulate the actual flow meter, perhaps for test or troubleshooting purposes? Yet, you "are not skilled in electronics" by your own...
  7. hevans1944

    Reversing polarity

    Sorry about your luck. I have used this circuit for many years and it has always worked. It appears you may have a limited understanding of electricity and circuits, and perhaps are having difficulty following and connecting simple wiring diagrams. The bottom two relays are wired as a DPDT...
  8. hevans1944

    Old Resistors

    It did not make the "wah, wah" sound you hear when the player alternately mutes and un-mutes a brass instrument such as a trumpet. The Leslie sound is quite unique, but can probably be reproduced today fairly easily with a Digital Signal Processing (DSP) chip. The Leslie system was an "add on"...
  9. hevans1944

    Old Resistors

    Ha! Whut a find! And is that a 115 VAC convenience outlet on the right side for connection of an add-on Leslie Speaker?
  10. hevans1944

    Old Resistors

    I often have trouble figuring this out, especially when there are five or more colored bands. If the resistor is still intact and not crispy-fried, my trusty multimeter will usually get me into the ballpark range of the resistor value, from which I can then usually figure out which way the color...
  11. hevans1944

    Oscillating reed switch

    One million cycles is way too limited for a low-current, low-voltage, magnetic reed switch. For your application, 1 V and a few microamperes, expect upwards of one billion cycles, or a thousand times longer than what a measly million cycles lifetime would provide. This is still not good enough...
  12. hevans1944

    Old Resistors

    WTF did you get this "information"? It is totally wrong!
  13. hevans1944

    Old Resistors

    It's a 2.7Ω, 10% tolerance resistor. See this chart for four-band and five-band resistor color codes..
  14. hevans1944

    Electronics for prop control

    I have long maintained that the patent system is fatally flawed and useless for the individual inventor with little or no resources to defend a patent. If you have invented the next better chicken, then control the production of eggs. Don't publish how you did it for all the world to see and...
  15. hevans1944

    Reversing polarity

    Okay, for those of you who need a "wiring diagram" see the image below. The motor must have "floating" connections. Ignore the apparent open connection at the bottom of the motor "-" terminal: this was supposed to be a connection between the motor "-" terminal and terminal "30" of the bottom...
  16. hevans1944

    Reversing polarity

    If I recall correctly, you cannot simply use a limit switch that reverses the motor direction when the limit switch is actuated, and then continue in the reversed direction toward the other limit switch, because as soon as the motor drives the mechanism off the first limit switch, de-actuating...
  17. hevans1944

    Capacitive Force Sensor Circuit Project

    My patience has just about run out. Your lack of expertise is correctable with education, training and experience. So far, I have seen no indication that you are willing to put forth the effort necessary to gain any expertise. Instead you ask for ideas, suggestions, and answers to your...
  18. hevans1944

    Capacitive Force Sensor Circuit Project

    Okay, you are perhaps a serious newbie who doesn't want to get involved with Arduino, for whatever personal reasons, but are willing design your own signal conditioning circuits for the capacitive force transducer. This is a huge mistake. You know absolutely nothing about how this transducer...
  19. hevans1944

    Capacitive Force Sensor Circuit Project

    Since you are an admitted novice when it comes to circuits, not even recognizing what @kellys_eye was referring to when he mentioned sample-and-hold and peak detector analog circuits, what makes you so confident that only "fundamental electrical components and simple ICs" are necessary to...
  20. hevans1944

    Electronics for prop control

    I suppose that's the normal modus operandi of the business world. I was peripherally aware of it from other worldly experiences, mainly how my father and his brother-in-law conducted their business in the 1960s. They started their company by literally stealing a patent and manufacturing a...
View older results
Top