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  1. HANKMARS

    High current, 40 A to 100 A, current limiting devices other than a resistor

    I am using 10 Peltier devices connected in parallel. Each device is rated 12 VDC, 15 Amps. My concern is with initial power up. In prior experiments, at the instant of power on, the Peltier device appears as almost a dead short. Once the diode junctions begin to heat up, the device will limit...
  2. HANKMARS

    LiFePo4 100 AH battery charger

    My need is to maintain my 100 AH LiFePo4 batteries during periods of non-use. A bare bones, 120 VAC powered charger. If it has capability to charge 12 volt lead/acid batteries, all the better, as long as it is either a no fail auto system or has a selector switch. Fast charging is not the goal...
  3. HANKMARS

    Those that forget the past.....

    This is not a complaint or a request for argument but merely an observation and an expression of my opinion. Regarding the attachment, I do not agree with the first paragraph. I think it looks like something AI would compose. In my opinion, an analogy would be, "Long distance travel by men was...
  4. HANKMARS

    DC voltage reduction circuit needed

    The latest charge controller I purchased for my PV system has a max input voltage of 25 VDC. My panels produce 36 VDC. I'm looking for a DC voltage reduction circuit to insure that controller never feels any voltage above 20 VDC. Does anyone have a bare-bones, bullet proof buck circuit handy?
  5. HANKMARS

    Ultrasonic trans/rec transducer support hardware

    I will be using an ultrasonic transducer (t/r). Ideal signal is 40 kHz. 10 V nominal to transmitter. I am assuming I need to supply a 10 Vpp 40 kHz signal (squarewave?) to transmitter. Also I'm guessing a 40 kHz pass filter will be needed on the receiver component. What I am trying to determine...
  6. HANKMARS

    Cyber mystery

  7. HANKMARS

    Sharing phone data with stand-alone Bluetooth or Wifi ready monitor

    I feel like I may be the only guy on the block not to know this, but, are there monitors with built-in Bluetooth. Say a nominally sized computer monitor that will receive and display video data from my phone's Bluetooth comm system. Seems perfectly logical that there are such components. How are...
  8. HANKMARS

    Battery resurrection

    Anybody have some thots about rejuvenating totally discharged lead/acid batteries? Or better yet, facts about methods to rejuvenate a 12 V battery and its following performance characteristics. Battery University mostly proclaims that once a l/a battery has been so deeply discharged, it will...
  9. HANKMARS

    A shocking thot

    I had recently lashed up an extra power supply to my computer to replace its malfunctioning one. I left the room then returned and gasped as I perceived the new PS to be glowing hot. I was utterly terrified for one second before reasoning told me there was no smoke and the supply was running...
  10. HANKMARS

    Looking for suggested dynamic microphone power level

    I use a dollar twenty five cent headset microphone for recording purposes on my computer. I have made the assumption that an auxiliary source of current is needed to travel thru the mic to supply the varying converted audio waves to analog signal driving the amplifier inputs or maybe the power...
  11. HANKMARS

    What am I not seeing here?

    I received the following MPro notification but see no gosloto in EMP discussion. I did the following search from inside MPro. The results are as follows. I am at a loss of understanding on this matter.
  12. HANKMARS

    Power jitters

    When I scope out the output of a motor controller in operation, I often see a "chatter" of the sinewave. Is this due to REMF from windings or maybe reflected energy from a capacitive load trying to corrupt of make a phase shift of the power out? Let's assume my scope is triggered as finely as...
  13. HANKMARS

    For Sale: Gaming accessories

    I am Mr Gaming Illiterate but I think I have a couple game boards here. I think the GIGABYTE board is a high speed comm bd for gaming. Also think antenna bd is game accessory. Let's say 125 dollars for GIGABYTE and 15 dollars for antenna bd. If interest you can send your test method for function...
  14. HANKMARS

    Modified sinewave to pretty good sinewave?

    I have a decent 1100 watt modified sinewave invertor. 12 VDC to 120 VAC. Nice readout, input volts, Iout, couple warning prompts. If you have seen modified sinewave output then you are aware that it is mostly square wave with 4 shoulder levels per cycle. Pretty cheesy. Good for purely resistive...
  15. HANKMARS

    For Sale: Capacitor question and for sale

    I have 2 - Mallory 104000 ufd 15 VDC 18 VDC surge, capacitors. Are they of any value? Assumed working. Can certify if need be. Used.
  16. HANKMARS

    Wifi woes

    Is there an off the shelf product that will boost or improve my wifi reception? I currently use a Netgear E-6000 dongle.
  17. HANKMARS

    I have become a conservative but brot apathy with me so I don't really mind

    DEFINITION OF TERMS ! Need I explain? It IS important. I can't seem to stay on topic, hence, I am here. Definition of terms is important. In some situations, paramount. When the first space shuttle was a few minutes out from landing, mission control broadcast, " Twelve minutes til splash down."...
  18. HANKMARS

    Correct my errors as I make them, if u please

    I was told to believe and instructed to understand that the funny bone is connected to the giggle bone which resides at the inner end of the lower bone ( sometimes referred to as the lone bone ) at a perpendicular attitude. For non-electronic people, if this text is difficult to interpulate, u r...
  19. HANKMARS

    Alerts alert

    I can again log in, read my alerts, log out, log in, and alerts which I have previously read, still appear. Is removal of acknowledged alerts on a 24 hour clock? I thot perhaps the grayed alert box had significance but apparently mistaken.
  20. HANKMARS

    ITT bashing

    This question has evolved from recent political statements that I recently viewed. The politics of the matter are of no concern of mine but the subject matter is. Does ITT deserve the recent bad-mouthing it has received on national news? The only contact I had with ITT was a job interview...
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