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  1. HANKMARS

    FET question

    I have forgotten, or perhaps have never known, the function of the zener diode connecting the source to the drain, internal within a FET. Is the zener inherent of the fabrication of the device or is it engineered and added? I suspect one function may be to keep current carriers from traveling...
  2. HANKMARS

    Balanced load, splitting a 220V outlet

    In the main breaker panel I have a 50A, dual phase breaker. This feeds a typical electric clothes dryer outlet. Two hots, one neutral, one ground. I would like to go from that outlet to a 110V 4-way box. The 4-way consists of two duplex 110V three prong outlets. I would like to take phase A to...
  3. HANKMARS

    Diode identification problem

    I came across a shorted diode which needed replaced. It read 0 Ωs in both directions. The part number most significant appeared to be RB30. Above that was a number A34. The silk screen indicated a zener diode. I found a datasheet containing a list of zeners which contained the RB30 sequence...
  4. HANKMARS

    Optics, filters probably

    I have an idea of what these glass filters may have been used for but, so as not to influence your thinking, I will mention those ideas later. Also, someone may know exactly what they are. The red filter lets absolutely no light, emitted from a blue LED, to pass through it. I may use the red...
  5. HANKMARS

    ALT+4 CHAR GEN USING ON SCREEN KEYBOARD IN WINDOWS 10

    The only viable method I have heard suggested for ALT+4 character generation is to create character table to be navigated, as I recall with F keys. That's it? Left high and dry, twisting in the wind, abandoned again because....why? I can only guess and it would be unfair to criticize without...
  6. HANKMARS

    HEADPHONE PANEL JACK CONTROL

    I have a Dell Opti-Plex 760 with Windows 10 OS. The front face has 2 -1/8" panel jacks. One for microphone and one for headphones. I have used the headphone jack to feed assorted audio playback units. Recently the headphone jack has stopped delivering a signal. Not sure what knocked it out but...
  7. HANKMARS

    OOPS! I MEAN BIG OOPS, MAYBE. ROOKIE MISTAKE

    While working on an audio amplifier of my own design (by that I mean a 2 stage, A class amplifier, nothing novel) and using a 2N3055 for power out, I was using 20" test jumper leads for making interconnects. Most of them draped over the front of the bench and hung alongside my leg and some times...
  8. HANKMARS

    QUOTES

    How do you create and save quotes on personal site?
  9. HANKMARS

    Creating an alphabetized list

    I need to create a list of items. Example: Resistors, ICs, Squeezy Clamps, Resistance Wire. I desire an app that will alphabetize each line according to its beginning letter. Also as I add new items to the list, they will be placed in the list in alphabetical order. It seems like such a simple...
  10. HANKMARS

    TRIMMING AN AVI FILE. THE FILE SIZE EXPLODES

    I made an audio/video recording with a fuji digital camera. I copied the file from the camera to my computer. The recording is 26 minutes in length with a file size of 1.79 GB. I trimmed a section out that I want to use. The trimmed avi is 2 min 45 sec long with a file size of 2.16 GB. What...
  11. HANKMARS

    WILLY LOMAN WAS JUST TOO DARNED ETHICAL

    No worries Willy. Grab your satchel and let's hit the road. The 21st century salesman has no obligation or accountability. Dazzle em with details or baffle em with bullshit. Make the sale trumps all rules that may have once applied. Get in soon tho. The hucksters and shysters will soon out...
  12. HANKMARS

    WELLCAM: ROUND 2

    This project is in the que and approaching rapidly. My last efforts regarding this project, resulted in quite an acquisition of knowledge related to video workings. An off the cuff WAG, concerning my first attempt at fabricating an acceptable remote camera system, is, the DC level of the video...
  13. HANKMARS

    Video monitor cable adaptation

    If possible I would like to inject the video signal, generally referred to as an analog signal generally connected with an RCA type connector, into the 15 pin D connector used often on computer monitors. I will guess the D connector is a standardized pin out. Will this be a simple lash-up or...
  14. HANKMARS

    BATTERY RECHARGING DETAILS NEEDED

    I have developed some devices who's power requirements are best met with battery packs. At the moment, it is impractical to consider custom battery packages as a power supply. I am constructing my own packs using AA size batteries. Due to space constraints, I am unable to use manufactured...
  15. HANKMARS

    PLASMA CUTTER IGNITOR CIRCUIT

    The following photos are of a section of circuitry that I am guessing drives or times a flyback transformer which goes to a spark gap and induces the arc of a hand held plasma cutter. The schematic is my best guess of circuitry. Any chance I can drive the IRFP264 MOSFET with bipolar transistors...
  16. HANKMARS

    JAKES LADDER

    I have an extra high pressure coil and now have a notion to construct a Jacob's Ladder. At first blush, I had no idea why the active arch would begin to travel upward along the ladder sides, increasing the length of the arc and apparently the resistance thru which the arc must travel. Seems to...
  17. HANKMARS

    Connecting non-solderable wires

    I will be using resistance wire which will not accept lead/tin solder. On prototype I would use a loop to loop sort of configuration when one of the wires were solder-able. This would tightly trap the resistance wire but is unsuitable for practical use. I desire to have a positive hold at these...
  18. HANKMARS

    Hello. I am HANKMARS. Jack of all trades, master of none.

    Many of my projects may seem off the wall. Some are, some are not. Many times, if a device is needed, I may try to construct it from components on hand. Sometimes leads to interesting discoveries and other times simply leaves me exasperated. At that point I revert to conventional actions...
  19. HANKMARS

    CCTV CAMERA LINGO

    The camera that I ordered lists HD 700TVL as an attribute. I'm guessing "High Definition ??????." I do not really have a good guess for 700TVL but I'll try 700 lines in the raster. Anybody know?
  20. HANKMARS

    Does this coding look familiar to anyone? RC transmitter

    The "carrier" waveform is a square wave at 14Hz. The embedded coded waveform is a variable pulse width square wave running at 300Hz.
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