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  1. Fish4Fun

    unknown LED specs

    I keep a 1.5V AA wired with a 1k resistor handy for 100% sure-fire safe polarity testing. Even on a 3.6Vf/3W LED bead there is a faint glow good enough for indicating go/no-go testing. Fish
  2. Fish4Fun

    Value of RF (feedback resistor formula)

    You might look here...
  3. Fish4Fun

    Help with bench-top PSU

    Yes, knowing the type of PS is important, more importantly, since this is an OEM part, and I can't seem to find it's specs, you need to take a picture or type the specifications on the label and post here. If I had to guess, I would assume the PS has more than one rail for the +12V (Yellow...
  4. Fish4Fun

    Upgrading 3.7 lithium battery with bigger mA lithium battery

    Mustwin351, First the good news: from the player's point-of-view 3.7V is 3.7V, no problems there. The bad news involves any "built-in" charging, this could prove to be problematic. There are several different lithium battery formulations with numerous different charging technologies associate...
  5. Fish4Fun

    Strategy game "GO" board

    Johnyy, "Games" are a tough place to "start" with uControllers. I would strongly urge you to start with something like Visual Basic and write the game for a PC platform. That may well prove a larger task than you are thinking, but in any case will help you define exactly what you will need to...
  6. Fish4Fun

    DPDT RELAY

    By all means, godspeed and good luck! However, if I might suggest, you should reconsider your approach. You provided far more information in your 3rd post than in your previous two posts combined. Furthermore, a large grade "A" egg weighs ~2oz; 1350 of said eggs would weigh roughly 168lbs...
  7. Fish4Fun

    IR Laser for Comm

    I have the most complex residential water system in history, won't go into details, but I would like to monitor some facets of it. The "water shed" is ~75ft from where I would like to monitor it. The obvious/simple answer is to run a wire, but what fun would that be? The next obvious answer...
  8. Fish4Fun

    understanding Ferrite Rings

    whopachop, Perhaps if you provided a schematic of both the LED dimmer circuit AND the voltage regulator showing how they are connected it might shed some light on what is going on. I suspect that you have the voltage regulator feeding the dimmer circuit which can certainly cause problems. LED...
  9. Fish4Fun

    DPDT RELAY

    jonnydot, With all due respect, a first post that includes, is not likely to solicit much help. I, like many here, can think of dozens of ways to approach your project; and, I think it is safe to say, like others here, have absolutely no desire to provide you with a turn-key solution...
  10. Fish4Fun

    H-Bridge Circuit Design

    Kris, For now I am going to forgo the LF/Constant on, and focus on prototyping a BLDC driver with 3 * IR2184 and some mosfets for a relatively low voltage/current motor (<15V/10A), just so I can get some experience with how these ICs actually work. I understand the theory just fine, but I...
  11. Fish4Fun

    H-Bridge Circuit Design

    Kris, IR2184 it is then, lol. IRF's AN-978 Section 8 "HOW TO PROVIDE A CONTINUOUS GATE DRIVE" (page 17&ff) details the use of a 555 timer in conjunction with an IR2125 and an IGBT to maintain the voltage in a bootstrap capacitor. I haven't written any fiction in quite some time, though...
  12. Fish4Fun

    Tv remote jamer

    Range would depend a lot on the IR output level, how closely the jammer frequency matches the detector's frequency, how sensitive the detector is, how good the detector's noise rejection is and how directly the IR jammer is pointed at the detector, so in general, I would SWAG 2m > <10m. I...
  13. Fish4Fun

    H-Bridge Circuit Design

    Hrmmm.... Psychologically difficult or not, I guess I had best at least give your advice another go. I have HIP4082's ( http://www.digikey.com/product-detail/en/HIP4082IPZ/HIP4082IPZ-ND/821447 ) , FAN73711's ( http://www.digikey.com/product-detail/en/FAN73711MX/FAN73711MXCT-ND/2115888 ) and...
  14. Fish4Fun

    Tv remote jamer

    IR remote detectors in general use a 35-45kHz carrier frequency, When a signal in this frequency range is "detected" the output goes low, when it is absent, the output is high. Most detectors are designed to "reject" inputs of less than ~10 pulses of the carrier frequency. This implies that...
  15. Fish4Fun

    H-Bridge Circuit Design

    TY Kris. I truly hate my dyslexia :-( It is late here, my head is a bit fuddled, and the efficacy of my meds has expired, so I need some sleep before I can ferret out if I mis-drew the schematic or dropped the ball completely....but it is definitely drawn wrong. I was in high school before I...
  16. Fish4Fun

    H-Bridge Circuit Design

    OK, there is nothing earth shattering here, this is a proof-of-concept schematic that represents what I currently have on a bread board for testing a 3-Phase BLDC motor from the RC Hobby industry. The Mosfets are FSL23N200, (200V, 24A 0.1 Ohm RDSon), absolutely NOT ideal for the purpose, but I...
  17. Fish4Fun

    Step-down transformer suddenly stopped working - but why?

    Now that we know a little more about the transformer, use the following search terms for an ebay search: 24v transformer 40VA Not sure about the UK, but in the US there are a lot of choices under $20. Fish
  18. Fish4Fun

    Step-down transformer suddenly stopped working - but why?

    mylop, I woke up grumpy this morning; that's not your fault. Transformers are generally reliable devices. As previously mentioned occasionally environmental factors cause failures. In addition to these failures power spikes can cause failures. While most transformers can withstand the...
  19. Fish4Fun

    Step-down transformer suddenly stopped working - but why?

    Transformers provide galvanic isolation from the mains supply. ( http://en.wikipedia.org/wiki/Galvanic_isolation ). This is an essential safety feature. It is highly probable you are working on an HVAC system as this is the primary use of 24Vac. This implies that you have opted not to call a...
  20. Fish4Fun

    Step-down transformer suddenly stopped working - but why?

    You have a bad transformer. Get a new one.
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