Search results

Search Forums New Posts
  1. S

    Problem with Pioneer SX-850 receiver

    I've got a couple Pioneer receivers from the 1970's. Biggest problem is the contacts on the push-button switches. Often not even always the switches for speaker selection. pushbuttons are to multi-contact slide switches. And each circuit has individual left/right selection. You can clean...
  2. S

    Newb question about voltage dividers

    You need to drop the full voltage across the two resistors. You pick off the voltage you want, between the two resistors, chosen for the voltage you want (when read between the two resistors).
  3. S

    Need a Relay

    Yeah, or your compressor has a problem. Did you check to make sure the rubber vibration isolators for the compressor are intact, and bolted down correctly? (That the compressor didn't shake itself loose) If you're wanting to go with a new relay, you can physically take it into an appliance...
  4. S

    Is my line tapped?

    *steve*'s got it right. We're waaay past the bad guys coming into your house and putting the little dime-sized mic in your telephone handset. If somebody wants to tap your phone, they won't need to rewire your house wiring, to do it. The phone company repair people aren't what they used to...
  5. S

    5000 watt portable generator

    Are you sure you're reading correctly? (Under the right conditions) Is the generator under load, or are you trying to read wattage with no load attached? If you're still wondering, we could use some more information on exactly how you're reading the 2500 watts.
  6. S

    What's this old cerdip chip?

    It's a Burroughs part number, like I told you. Unfortunately, it's one of their proprietary part numbers, ... made for them, for a particular purpose.
  7. S

    Tektronix TDS460 error logs

    Don't know. Like you, I'm not seeing an overall clear code for error msgs. Service Manual page #6-74 to 6-77 is the troubleshooting flowchart and diagnostic failure list. Each error calls for individual clearing procedure for the fault. Maybe somebody else KNOWS a clear errors for all faults...
  8. S

    Carbon monoxide monitor calibrator

    I figured there was a good reason you're the boss. I don't mean to sound like a pain, but it's the same problem with relying on the LED's to tell your people if the zero voltage is right. How's about, being the boss, you tell your people they can keep their analog meters, but if the do that...
  9. S

    Carbon monoxide monitor calibrator

    I'm guessing you want the LED to make it easy for your techs to adjust the zero. Doesn't this monitor have a visual display? Use that. I used to repair these instruments for a mine in Arizona, and also for water and gas utility companies. Don't screw around with them, somebody dies, they'll...
  10. S

    Marshall 6101 valve amp

    Not familiar with your equipment, but sounds like a grounding problem. (ie: works fine on bench, but not when put back in 'cab'). Carefully check all your electrical contacts where they might touch the cab, grounding out your electronics. I'll bet something electrical is touching the cab when...
  11. S

    Harm in leaving a cell phone plugged into the wall all the time?

    To the original 2nd question: Leave the phone off the charger during the day, and just put it back on the charger at night. (One way to make sure) NiCad (Nickel Cadmium) batteries, though better nowadays, have a memory problem. If not fully discharged repeatedly, they will over time, stop...
  12. S

    OPEN SWITCH WITH CAPACITOR+IC?,,

    Yeah, or since the display will be off the next time you want to check the time, and you have to activate the display anyway. Why not just put a momentary normally open switch in the display power circuit. Push the button and hold it to check the time, and then release the button, to turn the...
  13. S

    capacitor help

    I don't know what the 'x' or 'k' mean. Typically, the ufd and voltage is what matters, you should be ok. Make SURE you have the polarity correct, (the plus sign in the correct thru-hole), or you're going to turn your cap into a big firecracker.
  14. S

    Harm in leaving a cell phone plugged into the wall all the time?

    Get the manual on it (the phone, with info on the battery). Some chargers turn off and have a small trickle current to keep battery charged. Some don't. If your charger doesn't have the feature, you will greatly reduce your battery life. Only the manual will help you on this one. If you threw it...
  15. S

    charger problem

    A lot of electronics measurement accuracy, is very dependent on your meter, and your grounding. When you measure across an unloaded (no battery installed) charger, (especially depending on the design of the charging unit), you can 'read' substantially higher voltage than expected. Throw into...
  16. S

    Flatness of detector

    I work in an electronics standards lab. Flatness refers to the stability of the AMPLITUDE of a signal.
  17. S

    What's this old cerdip chip?

    That's the old Burroughs Corporation numbering system. It must be a proprietary number, on the Corporate Master IC List I have (my uncle used to work for them, deceased now), the only description for it is: '2-2-2+2 Gate' Sorry it doesn't cross to an industry standard (JEDEC) number.
  18. S

    Microwave Oven: Noisy, shuts down sometimes?

    Sheez, what kind of noise is it? Klystron tube crackling? Fan blades scrapping? Rotary turn-table gearing? You're obviously tripping some kind of thermal protection circuit. (That resets itself when it cools down). I wouldn't keep running it like that. If you can't identify the noise...
  19. S

    Tachometer Problem

    I figure Resqueline is keeping you on the right track, but I've got some input. I had the same problem with my van, took me a long time to find it. Culprit was a frayed/detached wire at the connector. When it was cold, dead. When the sun came up and warmed things up, it worked. I...
  20. S

    Another timer thread

    Sounds like a job for a TDR (Time Delay Relay). You can find any set time interval, or variable selection time interval, that you want.
Top