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  1. 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?
  2. HANKMARS

    Video signal amplifier.

    Well, the finished article is probably at the bottom of an 8" diameter hole, some 400' below grade. I will be building a new remote camera system and will have less limitations on hardware. Maybe use a cat5 cable. A larger spool for less winds on 500'.Two rather radical specs that I wish to meet...
  3. HANKMARS

    IR IMAGING DEVICE on the cheap

    I have been studying these graphs but have yet to understand them well enough to have an intuitive grasp upon various situations. I will keep at it though. Thanks for displaying them. I will "snip" these and put in my IR project file. At one particular job I had, I took readings using an IR...
  4. HANKMARS

    IR IMAGING DEVICE on the cheap

    The IR filter device is changed from IR filter to no IR filter by changing the polarity of the input current. I found it handy to use 2 alkaline batteries in series (3V). I used no current limiter with these but did when using 5 volts. Seems like I used a 220Ω resister and only energized circuit...
  5. HANKMARS

    IR IMAGING DEVICE on the cheap

    Well, as far as my analysis of what I have come up with, my security camera modification has landed me in the high frequency end of the near infrared spectrum. I'll guess right around 0.0077μm wavelength. This maybe hasn't left me totally SOL, but it would be nice if I could see lower...
  6. HANKMARS

    IR IMAGING DEVICE on the cheap

    Alrighty. Making a visible light filter should probably be my next task. With too much ambient light, the photo sensor circuits emulates an iris contraction. I may have an end piece from a color negative. Usually not opaque but a darkish redish color.
  7. HANKMARS

    IR IMAGING DEVICE on the cheap

    The device in a following photo was inline with what I refer to as the objective lens. It resides between the objective lens and the sensor plate of a security camera that I have disassembled. I will apply power to this component's leads and make an observation of the translucent film which it...
  8. HANKMARS

    Does this coding look familiar to anyone? RC transmitter

    I did take some IC numbers from what appeared to be a Tx and Rx set. One each located on their respective board. I think it was the Tx component data sheet that I found, or it may have merely a chip for sale. A little vague on the memory.
  9. HANKMARS

    Video signal amplifier.

    I share your sentiment concerning learning. If one no longer has a desire to find answers to his questions, he is well on his way to mental stagnation and the resulting rot that it will develop. And God am I surrounded by those that can not escape the prison of their own past. Apparently, they...
  10. HANKMARS

    Does this coding look familiar to anyone? RC transmitter

    The transmitter in this case is from a Chamberlain (Sears) garage door opener from around 1980. When a signal was sent from this transmitter, what I found on the receiver board was a little "burp" on the output of the op-amp that resided on the receiver board. The output voltage would stutter...
  11. HANKMARS

    IR IMAGING DEVICE on the cheap

    Interesting video. However, I believe I did hear mention of a fireball. Not a desired side effect. When the person in the video was desoldering the shorted capacitor, he was heat sinking the heat gun energy by grasping the component with tweezers prior to the solder becoming molten resulting in...
  12. HANKMARS

    IR IMAGING DEVICE on the cheap

    Thanks for the reference. The materials this article suggests to use as an IR filter may impede the transmission of IR energy so as to make realtime observation impractical with the suggested design. Perhaps polarized sunglasses lens, one turned perpendicular, may offer enough blocking of...
  13. 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.
  14. HANKMARS

    IR IMAGING DEVICE on the cheap

    Any thots about constructing my own IR pass filter? I'm going to guess that an inexpensive IR pass filter would make constructing my own filter, seem to be cost ineffective. That is however, just a WAG.
  15. HANKMARS

    IR IMAGING DEVICE on the cheap

    It would seem that alcohol fumes could be unsafe in the presence of white hot metal or silicon.
  16. HANKMARS

    Video signal amplifier.

    I will, with clear conscience, confess that I, too, abruptly ended cable TV viewing in a large neighborhood area for part of a day. I was installing a cedar privacy fence for a homeowner, myself being an employee of a business named appropriately, The Fence Store. Perhaps loath is not the exact...
  17. HANKMARS

    IR IMAGING DEVICE on the cheap

    Good idea. I do have some spare security cameras on hand. Using them would solve the problem I have of getting a live feed from my camera to my computer as the camera goes to a transmit mode and live imaging stops when the communication cable is plugged into its port. Thx.
  18. HANKMARS

    IR IMAGING DEVICE on the cheap

    Very interesting. My little Fuji digital may well be 10 years old. Not sure what you were considering old when you mentioned yours.A few years ago I took some shots of a lunar eclipse. For a hundred dollar camera, I found the results very impressive. Nowhere near quality for publishing but would...
  19. HANKMARS

    IR IMAGING DEVICE on the cheap

    I seriously desire to have an IR imaging device to use to observe circuitry when powered up so as to get hints of trouble spots. However, my desire to not spend $1K and up supersedes the former desire. I currently believe that an off the shelf $100 digital camera and the proper filters and a...
  20. HANKMARS

    Video signal amplifier.

    I believe that I still have a DC level problem. If camera strains to get an image in low light (practically total darkness) color is lost, even after light is reintroduce. Same goes for a screen white out because of over exposure. Maybe the amp rails out and latches up. Cycling the power will...
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