Search results

Search Forums New Posts
  1. Fish4Fun

    Questions on power supply

    I STRONGLY disagree with this philosophy. Regardless of the source, you should always make certain that the current is limited to what the circuit is designed to handle....an "old" car battery might still provide 100A or more, while an "old" zinc-carbon battery/batteries may not provide the...
  2. Fish4Fun

    my project ... guide me...

    Really? I think you might have missed this bit: Please understand that a site with an average wind speed that varies from 5mph to 13mph is NOT an economically viable site under NORMAL considerations. That being said, if grid power is 1) unavailable 2) unreliable 3) VERY expensive then the...
  3. Fish4Fun

    Help building a 220 to 4 volts 3 Amps PSU

    @ the risk of using the "easy button" why not just buy an LED driver? If you have trouble finding one that converts directly from 220V to 4V x 3A then why not just get a 220V to 12V "universal" SMPS then use any one of a number of "adjustable" CC/CV converters? Obviously it is easy enough to...
  4. Fish4Fun

    8051 specification

    vead, I am not certain you have a good working knowledge of what a "processor" actually is.....Since you have previously stated you are attempting to synthesize an 8051 processor in Verilog (an HDL), I think you should spend some time familiarizing yourself with how processors are actualized...
  5. Fish4Fun

    LED Light Panel

    OK, 1.5kW for making movies/Films makes good sense....sorry for assuming you did not have a firm grasp on HOW much light 1.5kW of LED lighting really is....while I have dabbled in LED lighting for more than a decade, if cost is not the primary mitigating factor, then you should really contact...
  6. Fish4Fun

    Piezo trigger circuit

    oh.....so my dyslexia has now crept into entire paragraphs....it is no longer just a dog/god problem :-( Fish
  7. Fish4Fun

    LED Light Panel

    Hey matakus! Welcome to EP! 1.5kW of LED's in a single array? SERIOUSLY???? Even if you opt for China-Cheap a 100W LED array chip is ~$20 so you are looking @ close to $300 in LEDs and likely another $600 to drive them...and that's with China -Cheapos...if you go with the Cree chips and US...
  8. Fish4Fun

    Piezo trigger circuit

    Hey Neurotic! Welcome to EP! The biggest problem is that a PC key board is a "Matrix" that is constantly "scanned by Row & Column".....any given key's state is decoded based on it's "address" within the matrix.....in short, you aren't going to get this to work THIS way....If you truly want to...
  9. Fish4Fun

    my project ... guide me...

    Hey kamalahmad! The biggest problem with wind turbines is that there are very few habitable places in the world that actually have enough prevailing wind to make a wind turbine a viable investment... Large Scale Commercial wind turbines do typically produce AC power that is synchronous with the...
  10. Fish4Fun

    Help to build: bi-directional 870MHz amp

    rexys, Again, RF is not really in my wheelhouse, but if you are in the US (or any number of other countries), you might want to check the restrictions with-respect-to allowable power....If there are any other devices in the vicinity that utilize the 800Mhz band you might want to make certain...
  11. Fish4Fun

    pcb board coatings

    If you are just attempting to salvage the copper then Acetone should do the trick...if you are attempting to also salvage the PCB Acetone might be problematic. Fish
  12. Fish4Fun

    US based PCB manufacturer

    Good info.....I typically do my PCBs on a desktop CNC router, but there are times when etching would be a much better choice.....I hate toner transfer...I have had fairly good luck with CEM in the past, but the problem there is shelf-life.....I purchased some 6mil/1/2oz Copper Clad Board a year...
  13. Fish4Fun

    Help to build: bi-directional 870MHz amp

    Hey rexys, Welcome to EP! Hrmmm, 870mhz.....home automation you might look @ http://www.ebay.com/itm/Module-433MHz-CC1101-CC1101-Spring-Antenna-Arduino-Robot-Wireless-RF-Transceiver-/201077732657?pt=LH_DefaultDomain_0&hash=item2ed12ab531 or one of the similar 2.4 Ghz...any particular reason...
  14. Fish4Fun

    Alternative Energy.....

    Hey Colin, My Apologies for the improper syntax...I DO understand the difference between a kW and a kWh....the point of the example was to re-create the diction used in a typical post by someone who not only does not understand the difference between a kW and a kWh, but who believes absolutely...
  15. Fish4Fun

    Mosfet Selection....

    Again, Great Catch! But, RDSon is only one spec that makes this particular mosfet really appealing for Low Voltage applications...the extremely low Vgs, Excellent Tf, and very good Tr all combined with exceptional value make me want to find a project for it! But I am a bit sad that you didn't...
  16. Fish4Fun

    Led circuit

    WOW Kris.....that's a lot! I would have just suggested an Arduino....lol....I too frequently decide to solve logic projects with uControllers in the the full knowledge I have bins full of logic ICs simply because I think debugging code is so much faster than debugging breadboards and wiring up...
  17. Fish4Fun

    Mosfet Selection....

    Just read a response KrisBlueNZ made to a thread on a motor speed controller where he recommended a NTD4906 mosfet as a good choice for a low-voltage//low gate threshold switch..... First, Great Catch! Sepcs on that little mosfet are fabulous and they are virtually free! But that isn't really...
  18. Fish4Fun

    -1kV pulse generator

    Oseania, Perhaps if you gave a few more details about what you are attempting to achieve we might be able to make better suggestions about how to approach the problem....for instance the first things that come to my mind when I think of HV pulses designed for corona discharge are 1) "Ignition...
  19. Fish4Fun

    algorithm for micro controller

    vead, First Verilog//HDLs//FPGAs are NOT really in my wheelhouse....but, I assume you are attempting to synthesize an 8051 on some specific FPGA demo board/platform? I am certain you must be aware of public domain libraries like: http://www.cs.ucr.edu/~dalton/i8051/i8051syn/ ? The 8051 core...
  20. Fish4Fun

    Home made valve oscilloscope. Version 2.0

    Miguel, WOW. I am in awe....What an absolutely AMAZING project! Living in the US, I and so many others are so incredibly spoiled by the plethora of virtually "free" hi-tech equipment that we generally take it for granted that building something like a tube-based analog oscilloscope would not...
Top