Search results

  1. Fish4Fun

    Solenoid connected to SSR, Arduino Rapid Firing

    Hey BodhiSci! I would strongly suspect the problem resides in the Arduino code.....On ReSet most or all I/O Pins on AVRs are in the "High-Z Tri-State" until initialized to some other state.....how the DDRx Register and the PORTx registers are initialized...and how "toggling" is actually...
  2. Fish4Fun

    Crossover circuit for a hybrid speaker I'm building

    Hey Boris! Welcome to the forum! Passive crossovers....at best power sucking heaters....I can remember when....quite a long time ago....I was fascinated with "Hi Fi" (back in the 70's and early 80's)....passive crossovers bothered me then much as they do now....but back in the day, amplifiers...
  3. Fish4Fun

    Ten way relay switch required.

    Hey Oli! Welcome to the forum! Hrmmmm.....I am not sure you have a firm grasp on the way a keyboard works....all of the "keys" are momentary switches configured in rows and columns....inside the keyboard is a uController that "scans" the rows and columns thousands of times per second looking...
  4. Fish4Fun

    PWM solenoid use

    Hey Randy! Welcome to the forum! I was a bit uncertain what a "PWM Solenoid" was....honestly thought you might have made it up, lol, happens here sometimes....but it turns out they are quite real ( http://www.tlxtech.com/understanding-solenoids/theory-operation/pwm-solenoid-theory/ ) and, as...
  5. Fish4Fun

    How to get 100% brightness out of my l.e.d's

    Hey soniksizeme, Welcome to the forum! Something you should be aware of about LEDs.....Typically ~90% of an LED's brightness occurs somewhere between 70% and 80% of rated power input, particularly in "Hi-Power" LED's...additionally the amount of heat generated by the LED increases exponentially...
  6. Fish4Fun

    I Want Your Thought About My Summer Project

    Hey Zarnold16! I have built more work benches than I care to remember....some have proven to have really useful features....most end up being too small, LOL....but the design cannot be made larger than the space it is allowed to occupy.... Having Workspace "A" & "B" connected by either a curve...
  7. Fish4Fun

    Best cheap material for diy low power heating element

    Hey Voltaic! If you are looking for a good place to get started with electronics that is both safe and cheap, I would suggest LEDs....At the most basic level you can use a simple resistor to learn about limiting current....at the other end of the spectrum are current regulated forward...
  8. Fish4Fun

    Best cheap material for diy low power heating element

    Hey Voltaic! I did not 'suggest' I thought you might head off willy-nilly to do something that might be unsafe; I stated I was concerned you might. Please remember there is no way in a forum to know anything about the person who is posting beyond what they type in their post....among other...
  9. Fish4Fun

    Getting Started with Universal Serial Bus (USB)

    Hey Dan! I personally use VB6 but if I were starting now I would go with .NET. I maintain the POS application that runs my business....I started writing it in DOS based BASIC back in the mid 1980's....eventually migrated//massively re-wrote to VB4/5/6 in the 90's.....The thought of once again...
  10. Fish4Fun

    Best cheap material for diy low power heating element

    Voltaic, I don't know the history of your posts, or who suggested you should be banned, but I certainly did not see anything ban-worthy in this thread....worst-case, as hevans1944 stated, perhaps a bit naive, but as long as you are making an honest effort to learn I would urge you to...
  11. Fish4Fun

    Best cheap material for diy low power heating element

    Voltaic, Nichrome wire is neat stuff....but you really DONT want to: If you will take a look at the temperature rise of NiChrome wire wrt Amperage you should notice the rather high temperature with even fairly low current....temperatures that are certainly beyond the melting point of most...
  12. Fish4Fun

    How to work with Zener diodes?

    A lot depends on what you actually want to use the circuit for...ignoring the actual question for a moment, and assuming what is required is a 2.4V reference and that Vin is really variable from 12V to 29V...it would likely be easiest to simply use a voltage regulator to get a nice stable 5V or...
  13. Fish4Fun

    what wattage value would I use for the resistors in this schematic

    Hey Adrian21f ! Welcome to the the forum! So assuming the nominal circuit voltage is 9V * 3 = 27V, and the smallest resistor (r3) = 100 ohms a first order approximation would go something like this: E = iR --> 27V = i * 100 ==> Imax = 0.27A = 270mA P= iE -> 0.27A * 27V = 7.29W ==> r3 Power...
  14. Fish4Fun

    Getting Started with Universal Serial Bus (USB)

    SuperCap2F, At the risk of making this too simple.....As has been pointed out by everyone so far, a simple USB to RS232-TTL interface is really cheap and easy....requires just 3 wires for Full Duplex comm to your projects (Rx, Tx, Gnd) and are cheap as dirt....Unless you are designing a...
  15. Fish4Fun

    Best cheap material for diy low power heating element

    Hey Voltaic! NiChrome Wire is a common answer... http://en.wikipedia.org/wiki/Nichrome It is available under several trade-names as well as generically....ebay is likely a good source for small DIY quantities. Another choice popular in the 3D printer world is simple copper clad board (PCB...
  16. Fish4Fun

    H2O Auto-Fill Schematic Sanity Check

    Hey Adam! Yes, Sorry, posted before refreshing.....Looking @ my first schematic I think my dyslexia out paced my A.D.D. meds......My problem is that once I "have it right in my head" I tend to "mentally correct what is actually on paper" and absolutely fail to see the errors on paper unless I...
  17. Fish4Fun

    H2O Auto-Fill Schematic Sanity Check

    One final change...went to a 10000uF Capacitor on the mosfet gate and a 510k pull-up resistor...this increased the turn-on delay time to slightly over 30 minutes.....Surprisingly the mosfet does exhibit some temperature rise during the final 5 minutes before turn-on, but it is certainly not...
  18. Fish4Fun

    H2O Auto-Fill Schematic Sanity Check

    As an Addendum.....It turns out I don't actually have any BC547 transistors on-hand....I tried an 2N3904 and it didn't work well enough to satisfy me.......I really haven't done much with BJTs...long history of failures there....lol....there is absolutely nothing critical in this circuit except...
  19. Fish4Fun

    H2O Auto-Fill Schematic Sanity Check

    Here is an image of the logic table, lol. I really would love to know if there is a work-around for the <code tag> issue.....seems kinda silly to have to post an image in place of a simple text file. Fish
  20. Fish4Fun

    H2O Auto-Fill Schematic Sanity Check

    Before I start building this I was hoping for a quick sanity check....The purpose of the circuit is to Auto-Fill a 250 gallon water tank we use @ my business to supply water to our live bait tanks. The water is used throughout the day and is supplied to the 250g tank from a well. Because well...
Top