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  1. Fish4Fun

    Increasing Line 120VAC to 340VDC

    Hrrmmm, I understand 200J/S = 200W, and I understand that the OP stated he wanted to charge a bank of 2500uF capacitors to ~400V, AND I understand charging 2500uF to 400V = 1C; AND I get that it takes 400J to charge the Capacitor Bank, AND I get that 400J/Sec ==> 400W.....but there is an...
  2. Fish4Fun

    SSR Heat Sinks

    Thanks Steve! I have used thyristors extensively in the past, just not configured as a "packaged SSR". I did spend a couple of days "mocking up" a thyristor SSR using 6 * BTA24 in parallel with a common trigger. I tested it on a single 1500W heating element and was pleased enough with the...
  3. Fish4Fun

    SSR Heat Sinks

    Thanks Steve! Being a little bit less verbose, here is what I have: http://www.ebay.com/itm/271231725184?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649 If you can glean from the picture the efficacy of the heat sink then you are WAY better than I am. I know your feelings on Chinese...
  4. Fish4Fun

    Need Advice - Safety Concern - wet electronics

    Two things: 1) CLR is basically a hydrochloric acid derivative, and does NOT PLAY WELL with the aluminum heater housing in a Shark. Any H+/Cl- solution will wreck havoc on Aluminum, period. 2) When my last Shark went "bang", it was a split in one of the tubes. An easy enough fix if you...
  5. Fish4Fun

    Help on circuit

    "Sinewaves"??? Tat was some of my BEST free-hand art! LMFAO! I will have to re-read your post in the AM, it is late here, and I have had a few beers....BUT, what actually happens according to the scope (and my design) is that the initial current is limited by the inductor when the mosfet first...
  6. Fish4Fun

    New to site and need of a little help on relay circuit boards

    ken7237, Welcome to the forum! In short, YES and NO. YES, You can buy all sorts of consumer timers for switching AC/DC on/off. WHAT you turn on and off is of no import, only the current/voltage/drive parameters....(ie, is the device 5Vdc, 12Vdc, 120Vac/60hz or is it 240Vac/50hz, how many...
  7. Fish4Fun

    Feasibility of using Arduino for timer project and would anyone build it for me?

    Mike, Welcome to the forum! Yes, the project is "fairly trivial" from several points-of-view. Sadly, that stated, it does not mean it would not become a time/money sucking vortex. I have, right now, everything required to meet your criteria sitting on my desk next to my laptop, and yet...
  8. Fish4Fun

    SSR Heat Sinks

    In addition to my electronics hobby, I have a home brewing hobby. I have a fairly large system for a hobbyist, and do 20-25 gallon "batches". Regardless of scale, brewing requires a fair amount of heating water (and then cooling it back down, hehe). I started with Propane, but for various...
  9. Fish4Fun

    Help on circuit

    Hey Kris, Here's the schematic of the prototype, lol, not much to it: **While NOT shown** (hehe, I know that kills you) there are two gate resistors on the mosfets in the actual circuit ...10 ohm to be specific.) Just two simple buck converters. The current is limited in firmware...
  10. Fish4Fun

    Help on circuit

    Thanks Kris! I kept scratching my head saying, "I can't THINK of any reason it won't work...", but I was certain I read somewhere that it was "bad practice", figured you would know. No worries about current limit, that's handled by PWM, Just trying to limit how many inductors/mosfets are...
  11. Fish4Fun

    Help on circuit

    Hey KRIS, hoping you are still around :-) I am STILL working on this project for the OP, hehe. It has, of course, metamorphosed into something quite different than the original "simple fade-in" (achieved that quite easily, lol.) Anyway, I had a quick question that I thought you might know the...
  12. Fish4Fun

    Adaptor interchanging

    The short answer is Maybe. The first adaptor (sic) is rated @ 1000mA output (1A), while the second is rated @ 750mA (0.75A). If the device requires LESS than 750mA, then the answer is "Yes" it will work fine. If the device requires more than 750mA then the answer is "No" OR "Only in a pinch"...
  13. Fish4Fun

    !WARNING! Cheap stepper motor on eBay - cheap for reason.

    Hrmmm, I have some of these (just for going round & round), but I also have a DIY CNC router and play with CNC a fair amount. The industry standard way of handling this is all done on the PC/Controller side, so I really don't see a problem if every feature in the drive chain is comprised of...
  14. Fish4Fun

    Upgrading 3.7 lithium battery with bigger mA lithium battery

    I would suggest the external battery pack voltage be within the charging range of the OEM charger....that is, if the device is designed to be charged by a USB connection, then the circuit is designed to be charged by ~5Vdc. I would NOT attempt to charge it with more than ~6Vdc. It is quite...
  15. Fish4Fun

    Dewalt Charger Circuit

    Hey David, Ok, first, there is nothing particularly fancy about the circuit. It is using the dual comparator (LM393) to test the charge state. There are A LOT of smd passive components on the copper side, more than I would think requisite and yet there they are....there are also what...
  16. Fish4Fun

    Dewalt Charger Circuit

    Post some pictures of the PCB (both sides) and perhaps some here can help figure out some likely things to test. Not a whole lot to a nicad charger.... Fish
  17. Fish4Fun

    Revese Engineering Electrinc Mussle Controller

    atnias, I looked pretty carefully in post #1 for your schematic, not saying it isn't there, I just can't see it. No Worries, it is very clear in post #3. If there is no inductor on the PCB, then perhaps your electrode is either acting as the inductor, or has an inductor built in. I don't...
  18. Fish4Fun

    Revese Engineering Electrinc Mussle Controller

    LOL, I note two things are missing: 1) Your Schematic 2) an Inductor. I suspect there has to be an inductor, I just don't see one (The "negative voltage" is a pretty clear indicator of inductance ;-) ) I would suggest that you look for an open-source project online to gain some insights...
  19. Fish4Fun

    Dewalt Charger Circuit

    Are you attempting to build one or repair one? If you are attempting to repair one, what seems to be the trouble with the one you have? If you are attempting to build one....any standard 12V ni-cad charger should do the charging job, the trouble is replicating a convenient connection scheme...
  20. Fish4Fun

    Equation to figure out the resistance to charge capacitors evenly

    lol, I suspect we are headed toward a "capacitor energy storage system " with zero losses...."obviously" a more energy efficient storage system than super conductors :confused: It is truly a shame that those physicist working on super conductors never thought of using capacitors for storage...
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