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  1. hevans1944

    Replacing Ni-Cd with Ni-MH in solar light?

    Are you sure you mean LiPo, generally a lithium-ion battery in a flat polymer case? I bet your luxury model has LiFePO4 (lithium iron phosphate) chemistry. I won't pay more than $2 for one; my wife will splurge as much as $4. Kids walking by sometimes steal them, so I am considering buried...
  2. hevans1944

    Replacing Ni-Cd with Ni-MH in solar light?

    I was thinking of doing the same thing. I went to Wally World a few weeks ago and discovered some of the solar-powered walk-border lights did have NiMH cells but most had NiCd. I don't like NiCd. It recently got unseasonably cold here and three of four solar lights (different Chinese imports)...
  3. hevans1944

    Hello.

    Bearded, too! I like that. Welcome to the forums! The battery you selected is a 3 V rechargeable lithium cell. It looks like it is intended to "float" across a 3 V power supply on a computer motherboard to provide backup power for the CMOS ROM bios. Note the terminals are for through-hole PCB...
  4. hevans1944

    Intel Galileo 1 unidentified component half-broken

    I would try to find out who makes this part. It looks like a hybrid of some sort, so it may be a special part that Intel outsourced. The Intel schematics are not much help as far as identifying commercial part numbers. From the size of it, it could be the ceramic resonator used for serial I/O...
  5. hevans1944

    Intel Galileo 1 unidentified component half-broken

    Looks like it could be an oscillator component such as a crystal or ceramic resonator. The board has a 32.768 kHz resonator (Y2A1) for serial I/O and a 25 MHz crystal (Y3L1) for the processor. Can you zoom in on the component and perhaps provide a part designation? It looks like the part is...
  6. hevans1944

    I need to time an AC outlet by seconds, or a break in a DC line

    It has been awhile since I have done anything with video camera signal processing, or fish aquariums for that matter, but I was trying to think "outside the box" on your problem. As I understand it, you want to dispense fish food periodically but not over-dispense. You also do not want the...
  7. hevans1944

    noob here.... can i use a generator to power my electric motor (woo woo)

    This will be my first and last reply to this particular thread, ever. Go ahead @chisechi "money is no object" and purchase the motor and the generator sets. Let us know how that works for you. The video you posted is a fraud. I don't even have to be there to "witness" this so-called "ground...
  8. hevans1944

    Need help with a proof of concept prototype.

    Actually, I think I look better clean-shaven too. And younger. So, once every five or six years or so I will shave all the hair off my face and marvel at the new person that appears thereunder. Then I grow it back. Takes about three months to get back to a neatly trimmed state. I tried the...
  9. hevans1944

    Help with wiring electric motor

    This motor appears to not need an earth wire. It does need 220 V AC, which may have one leg connected to neutral or not, depending on where you live. So, assume both of your 220 V AC feed wires are "hot". Connect one feed to the two yellow motor wires that are connected to the middle terminal...
  10. hevans1944

    Need help with a proof of concept prototype.

    I think perhaps a market survey to estimate the demand for your product is warranted before you invest much more time in your project. I used to shave every day, and as @KrisBlueNZ said, hair became stuck in my razor. Sometimes I just swished it out, sometimes I just changed blades, and finally...
  11. hevans1944

    CRO probes calibration

    Most CROs have a fixed-gain or CAL position on each input channel sensitivity control. An internal calibration potentiometer can tweak the CAL position to produce a specific sensitivity, such as 20 mV per division. Many CROs provide a square wave signal to check the CAL position sensitivity, but...
  12. hevans1944

    LIQUID FLOW METER with SIMPLE SPECTROMETER DESIGN help

    Please provide a diagram of how the liquid flows in the "rectangular cross-sectioned pipe." Is the pipe oriented vertically with flow from bottom to top? Why would the level of liquid in the pipe have any relationship to the flow rate of that liquid? Is the pipe some sort of manometer that...
  13. hevans1944

    Bose Wave Radio Model AWRC1G

    There is a downloadable PDF manual here. It says on page 15: To set AM/PM (12 hour) or Military (24 hour) time - With the system off, hold down Alarm Setup and press On/Off to switch between AM/PM (12 hour) and Military (24 hour) time formats. Maybe that will help if the manual describes the...
  14. hevans1944

    Use Capacitive Sensing to detect a train?

    Does your model railway use DC excitation on the tracks, with complex block switching, or does it use AC excitation on the tracks and Digital Command Control (DCC)? Block occupancy detection is almost trivial with DCC, or so I am told. Just need to add conductive axles to the rolling stock...
  15. hevans1944

    Is this switch safe? Dual 26650

    Deception by sellers on eBay!? I am aghast! What is this (Internet) world wide web coming to? I think some of these cowboys think WWW means Wild Wild West. Heh.
  16. hevans1944

    Is this switch safe? Dual 26650

    The seller on e-bay mistakenly listed the switch. It is NOT capable of 60 A. It may not even be capable of 6 A. The seller on e-bay directs the buyer to www.apem.com and suggests downloading a PDF for AV Series switches from that web site. I did this, and tried to upload the suggested PDF file...
  17. hevans1944

    Fanrunon - delayed turn-off for bathroom extractor fan

    Funny you should post this, as I am in the process of remodeling my bathroom, adding an exhaust fan, an infrared heat lamp for use after stepping out of the shower, and an overhead light inside the shower. I already have a switched pendant light over the toilet and six 60 W incandescent...
  18. hevans1944

    What would 'high-power' be considered? (Constant Current Source)

    Just saying, you should make sure it is just an LED (or several LED chips wired in series under the dome). I agree, no fun installing what someone else thinks is cool.
  19. hevans1944

    I need to time an AC outlet by seconds, or a break in a DC line

    What is the "ON" time duration of the feeder? How often does the feeder operate? Do you want to feed at particular times each day, or only a few times per week? How about a cheap web-cam like camera to inspect the water for food not consumed, and then with pneumatic-drill software detect and act...
  20. hevans1944

    What would 'high-power' be considered? (Constant Current Source)

    You might want to consider a commercial light bar. Plug-N-Play. Also, lower power LEDs for accent lighting come in strips that have built-in resistors every three LEDs or so. They can be driven with a low DC voltage applied between two parallel rails on the strips. Your choice of LED probably...
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