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  1. hevans1944

    Resistor Question

    Open should show infinite, not zero, resistance. Most digital meters will display OL to indicate an open circuit when trying to measure resistance greater than their range capability. OTOH, if the value is really 0.56 ohms, that's pretty close to being effectively zero ohms as far as most...
  2. hevans1944

    Unknown components

    From the dense growth, the plant may be an invasive species, not native to the island of Puerto Rico. Suggest @Benny7440 take more close-up, in-focus, photographs of what we are to identify and post them here.
  3. hevans1944

    INDIA+ POWER GRID

    Thank you, @Ian. Glad to see you are on top of this problem. This forum seems to attract a lot of posters, many with poor English language skills, who know little or nothing about electricity or electronics. This isn't an educational forum, per se, but rather an electronics discussion forum. It...
  4. hevans1944

    Reversing polarity on push of a button

    A mechanically latching DPDT relay with outputs (12 VDC and Ground) in series with DPST N.O. contacts on the push-button switch could work. Problem is, this type of relay generally has two coils which must be energized alternately to change the relay state. How to do this with a single N.O...
  5. hevans1944

    Testing Procedure For this Component

    The manufacturer no doubt has a test procedure, but the best "test" is to connect it as suggested in the application notes, or re-connect it to the original circuit, "fire 'er up" and perform the proverbial "smoke test." If it gets hot and emits smoke under normal operating conditions, then you...
  6. hevans1944

    Bajaj induction cooker 2000w - fault finding

    Maybe this video will help you "fix" it...
  7. hevans1944

    Testing Procedure For this Component

    This device cannot be used as a stand-alone step-down switching voltage regulator without providing additional components. At a minimum, an inductor, a fly-wheel schottky diode, an input capacitor and an output capacitor are required. If not the fixed output voltage variation, then a feedback...
  8. hevans1944

    Question about using two SMPS.

    No it isn't. In one image, +S and +V (bridged) are connected to the chassis, meaning this power supply produces negative voltage on -S and -V (bridged) with respect to the chassis. In another image, -S and -V (bridged) are connected to the chassis, meaning that power supply produces positive...
  9. hevans1944

    RF detector

    Most hams try to avoid "RF in the shack" as part of good amateur radio practice. Am ICOM IC-7100 is an excellent Japanese-manufactured mobile HF, 6m, 2m, and 70cm rig, much favored by appliance operators who just want to get "On the Air" without having to farkle around with their rigs. It's...
  10. hevans1944

    Motor Speed Sensor.

    When doing computer-aided design for electronic printed circuit board production, it is extremely important that the schematic capture process be exactly reflected in the netlist used to produce the board layout. And vice versa, so if any manual changes in routing are made, those changes are...
  11. hevans1944

    Hi, I am Dave from Utah

    Welcome to Electronics Point, Dave. There are a lot of folks here who program microprocessors and microcontrollers used as embedded devices in small projects. Usual languages appear to be variants of C or C++, BASIC, Assembly, and perhaps Java. There are probably other languages used, too, as...
  12. hevans1944

    RF detector

    You have an amateur radio license and still need to ask this question? What is your call sign and class of license?
  13. hevans1944

    Air Conditioner

    Looking at the OP's address information, it could be likely that "coil" may have intended to be "cold" in which case (if correct) the OP need only apply a removable, insulated, exterior cover to the window air conditioner during the winter. What this has to do with this forum is anyone's guess...
  14. hevans1944

    Air Conditioner

    I use either my Mossberg Model 500 12 ga. pump-action, pistol-gripped, alley-sweeper; or my Colt M1911 Government Model .45 ACP semi-automatic pistol for protection. Failing that, my wife uses her backup Ruger SR9 9mm semi-automatic pistol. However, none of this worked when someone recently...
  15. hevans1944

    Switching Polarity of Electro-magnet.

    This better not be about building yet another zero-point free-energy thingamabob... what is @jeremiah25 trying to DO with his electromagnet? Do we need to wear tin-foil hats while it is running? Chain-mail Faraday shielding suits? Or is this simply the probe coil for a very deep metal detection...
  16. hevans1944

    Does this exist: a relay that defaults to its last setting?

    Yes, there is, but let's discuss latching relays first before moving on... Latching relays can be a real PITA to properly design into equipment, much less retrofit to an existing design. It all depends on how they latch and how they change states. Some have two coils, each energized with a...
  17. hevans1944

    Under water wireless signal?

    Problem is, all the inexpensive transducers are made to operate in air. It MAY be possible to "bag" them in mineral oil (or similar relatively inert liquid) and operate them submerged in water. I don't know because I've not tried this. The resonance frequency will surely change, probably...
  18. hevans1944

    Under water wireless signal?

    Is the device in the pool mobile? If not, why not run water-proof cable wiring to control it? Electromagnetic waves do not propagate well underwater. That's why the U.S. Navy uses extremely low frequency (ELF) transmitters to communicate (one way only) with deeply submerged and stealthy nuclear...
  19. hevans1944

    Like New NordicTrack Exercise Bike - Dead Console

    Be careful in removing circuit boards to gain access to points you want to check for continuity. It is easy to accidentally stress and break connections. If a visual inspection appears okay, and all the readily accessible wiring tests okay for continuity, then it may be time to "fire that mutha...
  20. hevans1944

    Like New NordicTrack Exercise Bike - Dead Console

    In the photo that accompanies your text, the cable harness has two wires, one of them red, the other not visible. The round connector with the two nuts threaded onto its body appears to be a "barrel" connector, commonly used to interface with "wall-wart" power supply cables. There should be a...
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