Search results

Search Forums New Posts
  1. S

    Rascal Alarm Problem Help Please!

    If you can find the company on-line, you should do it. They can answer your questions and maybe supply you with the manual for your unit (on-line or in print). A lot of these alarm systems have a remote control (which I'm guessing you don't have). It's possible the fx light is looking for...
  2. S

    Rascal Alarm Problem Help Please!

    The BURGLARS are supposed to be afraid, not you. Make sure you know how to turn the alarm off (or ask the landlady), and try it. I'm guessing the previous owner had it working, or they would have had the landlady get it working. Whoever wrote the piece of paper maybe PLANNED on alarming it...
  3. S

    High current busbar for backplane

    I did a little looking around. ELECTRICAL (not electronic) supply places have the types of buss bars you're looking for.
  4. S

    High current busbar for backplane

    I've cut my own from copper sheet stock. But you can usually buy the size you need, cut to your specs from the supplier. Another idea would be heavy copper braid.
  5. S

    Radio comms

    Isn't modern technology great? When I was a kid, we'd walk down the street and pick-up a couple dozen kids for a baseball game. I look down the street now, and there's not a kid in sight. They're either on a computer game, their cell phone, or some other computer or television system. Some...
  6. S

    AC rectification for LED's help

    A bridge rectifer is just four diodes. Depending on your amperage 1N4001 to maybe 1n4007. (At 6.3VAC you probably won't need anything higher than 1N4004). They also make more compact bridges (like the MDA prefix bridges). The MDA950 is pretty small. You'd have to have an extremely small...
  7. S

    Question about a recap

    In old TV's and some radios there are two 'grounds'. The chassis ground, and B+ (which is at an elevated voltage from chassis ground). Stick to the original polarity of the caps when you're replacing them in the old circuit and you'll be ok. You're thinking strictly in terms of chassis...
  8. S

    Speaker Volume Control possibly potentiometer

    Maybe somebody here can guesstimate a good part. I do things pretty literally. Do you have an ohmmeter or know somebody who has one? Measure the resistance across the two outside contacts on the pot, and you'll have the resistance of the pot. If you measure it's diameter, we can estimate...
  9. S

    Momentary DPDT normally open to normally closed?

    Do you have an ohmmeter, or just anything to identify when the switch contacts are open or closed? Typically, you have three contacts to a switch like the one shown. The center contact is common to the two outside contacts. One of the outside contacts would be NC to the center contact, the...
  10. S

    sony digital optical output dropout

    Is the Sony hard-wired or infrared or wireless? Anything interferring with the signal from where the new and old TV's are located? If this is a new Sony, they should have a technical assistance phone number or email contact. I'd try that. They'll ask you what you have hooked-up, and suggest...
  11. S

    Rascal Alarm Problem Help Please!

    I'm just guessing with only your description to go by. It SOUNDS like you don't have a sensor on your front door. It may have been removed, or depending on previous owner, maybe never installed. The FX light is probably telling you that the front door sensor is not working (because it's...
  12. S

    Speaker Volume Control possibly potentiometer

    I'm not seeing the pot. It would help if we could see the characters stamped on the pot. Is this a conventional potentiometer, or an integrated circuit variable pot. What would tell us what we need to know, is the wiring from the pot to your connector. Picture or hand-drawn schematic. (But...
  13. S

    Going from prototype to production question.

    I don't fill the bill for your tech advice specialist, but I have an idea or two. Are you already using surface mount 555's? That'll cut down space. Are you using both sides of the PCB? That'll save space too. How about using a LM556, that's an IC with TWO 555 timers on it?
  14. S

    gps and audio

    When you will immediately trip alarm bells with the guys in black suits for pinging their satellite.
  15. S

    problem with a paradox esprit 738 express

    I don't know, but I had an alarm system years ago, that listed the remote control unit as one of the zones on the alarm system.
  16. S

    Need Help ID'ing Older Dipped Tanatalums

    www.csgnetwork.com (/capcctantcalc.html)
  17. S

    Radio comms

    Most Hams are part-timers who get on the air when they have spare time. But there are a lot of guys who I find monitoring their most popular frequencies virtually any time I monitor them. It's good you've got somebody who'll help you get started. It's a lot easier when somebody is readily...
  18. S

    Voltage Regulator not regulating?

    I'd put a reistor in there, to drop that 18V value on your 12V regulator.
  19. S

    Radio comms

    I think Amateur Radio is in trouble in the States. Beside hard-core DXers, the appeal was to have auto-patch capability so you could tap into local phone lines from your radio. But that all went away with the advent of cell phones. I trained all my kids, but they dumped ham radio when cells...
  20. S

    Internship in a US Electronics company

    Tandy Corporation, owners of Radio Shack. They do all three. Most of their facilities are in Texas. Samsung has some large facilities in San Francisco area of California. Maybe somebody will have other ideas. These two companies are pretty open to college student interns. There are...
Top