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  1. alfa88

    Vacuum in a Can

    The more I delve into this the more I am impressed how the old timers were able to push the limits back then. ~20 years after the Edison bulb the extreme vacuum was replaced by using an inert gas ,argon or nitrogen. But that's light bulbs. As the name implies a vacuum tube is an evacuated glass...
  2. alfa88

    Vacuum in a Can

    Canned vacuum no. Helium possibly.
  3. alfa88

    Vacuum in a Can

    I found a site that suggests 10-4 Torr to 10-6 Torr. Also suggesting a 3 stage diffusion type pump. Too rich for my blood. A typical vacuum cleaner is 25 Torr at best. The air con. vacuum pumps I've looked at are using different specs but I'm assuming they're inadequate and a 2 stage diffusion...
  4. alfa88

    Vacuum in a Can

    I pretty much suspected I'd be hitting the same vacuum issues as the old light bulb guys of yesteryear. Even a 2 stage vacuum pump is purported as insufficient. I was just hoping someone was aware of a solution. 'Vacuum in a can' was just a pipe dream.
  5. alfa88

    Vacuum in a Can

    In anticipation of my receiving an order of a couple H.P. Friedrichs' books I've been contemplating how to achieve a vacuum for some of the projects. There are those CO2 cartridges so I wondered if anyone has come up with a vacuum cartridge. In lieu of that is there a low cost alternative to...
  6. alfa88

    Samsung TV

    Yea, I saw that after my post. If Mr. Nutwad is ambitious enough then get a new relay for Plan A. I forgot to mention Plan C which involves going to a retail store for a new TV.
  7. alfa88

    Samsung TV

    Plan A: Reinstall undamaged relay. Examine board for puffed out electrolytic capacitors and replace. Cross fingers. Plan B: Try Ebay. Look for the board #.
  8. alfa88

    Church Sony300 cd Player Won't Come On

    By 'standby light' I assume you mean power light. My 1st thought is a belt has broken. It looks like a rubber band. Trying to find a replacement is the hard part.
  9. alfa88

    Did I get shocked by my TV power supply?

    I wouldn't trust latex or nitrile gloves for electrical work. I've observed that the touchpad on my laptop will still respond while wearing them. Probably a capacitive property but sweat and oils can only add to the mix.
  10. alfa88

    Capacitor Explosions

    I guess I come from an age where we didn't have to worry about giving bad guys ideas. My bad.
  11. alfa88

    Capacitor Explosions

    Might I suggest wings taped onto the case and a launching platform for added enjoyment. All outdoors please.
  12. alfa88

    Sound Bar

    I started looking into a sound bar for my TV but stopped right in my tracks after I realized that there seems to be no provision for linking the TV's remote control power, +/- volume and mute functions. I don't want another remote control to keep track of or to be pressing buttons as if it were...
  13. alfa88

    What can you tell me about paper capacitors?

    If it were my project I'd bite the bullet and replace all the caps. 40 years is a long time. Don't expect miracles but it's definitely a good start. Hopefully you have a schematic.
  14. alfa88

    Finding IC datasheet

    Don't know if this helps but a LIS33DE Is an accelerometer made by ST. The odd pinouts match up. A pic of the entire board would help.
  15. alfa88

    iPad MDM Software

    I have the task of evaluating Meraki MDM software that will wirelessly manage the school's iPads. The big requirement is that kid's wont be able to remove management profiles that keep the things 'G' rated and location services intact should the iPad walk away. About a year ago Apple came up...
  16. alfa88

    1979 sanyo receiver blowing fuses

    I would be inclined to stock up on fuses remove the Darrlington Power packs 1 at a time. If it's not them then remove the Power Supply wires to the Amp boards to see if the Power supply is to blame. It looks like someone kludged in a fuse holder.
  17. alfa88

    PoE Part Recomendation

    I live right next to the ocean so a good seal is imperative. Around here stainless steel rusts! Thanks for the link. I saw one that may work.
  18. alfa88

    PoE Part Recomendation

    I got a new security camera system from Costco and it seemed like a good idea at first but now I'm having 2nd thoughts. The dongle that comes from the camera has a threaded end with an O ring and one would assume that is for a watertight connection. The problem is the mating side isn't included...
  19. alfa88

    Battery Control Laws in Canada?

    Underwriters Laboratories might be a good starting point.
  20. alfa88

    what exactly is Voltage

    Electricity is a form of energy as is heat. Voltage is the potential difference between no electrical energy and some electrical energy. Practical sources would be batteries(chemical reaction) or generation( basically a magnet moving across a conductive wire . Search Michael Faraday. Amperage...
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