Search results

Search Forums New Posts
  1. S

    Burned parts in power invertor Whitenergy 24VDC-230VAC 2000W

    Have you Googled the manufacturer and model number? Sometimes you can find somebody who has already dealt with a particular problem.
  2. S

    I have no idea

    I've read of paint-ballers and laser-light playing kids getting shot by real cops for less than this. If you set up yoiur 'fake' claymore mine anywhere, .... You better be wearing a vest, cause you're liable to anything, that anybody wants to do to you for the threat. I guess I can understand...
  3. S

    National BIG POWER Karaoke system by Panasonic

    We'll need more information to help. What's your skill-level in electronic repairs? The first thing I'd check, is to try to find out if the input mike is ok. Possible dropped, damaged mic, or wired connectors to the mic. Is it possible somebody yanked the cord which could have disconnected one...
  4. S

    Help finding right cable/connector

    What am I missing? Are you just asking for a mating connector for the Detoronics connector? Can't the manufacturer recommend the mating connector that you need? (Or have a website spec sheet that does it?). Or am I misunderstanding your question?
  5. S

    Potentiometer Burnout

    Plus, we don't know the rest of your circuit. If the circuit allows an excessive increase in current flow through some pots, and a decrease in current flow through the other pots, balancing total current flow trough the circuit: it's possible some pots could become damaged while others were not...
  6. S

    Potentiometer Burnout

    Can only speculate with what I read. If the pot is actually 'burned-out', is it possible the current through them was excessive the entire time you were experimenting, and it just happened to finally reach the point of pot failure? I mention this, in case you're running excessive current through...
  7. S

    Help with relays for motorcycle tail lights/turn signals

    Where are you at? Cars have good turn signal flashing relays for cheap. Isn't there something similar on the market for motorcycle turn signals?
  8. S

    Carp fishing electronics

    Or tying the end of the line to the big toe. Seriously though, KrisBlueNZ and Arouse1973 have a good point. PDR has a working circuit,and wants to improve it by having it trigger a light in his tent. It sounds like a relatively simple concept, with a little more input from PDR, I know he'll get...
  9. S

    Simple question about a IC

    Alright. I don't know what you've got. If you're using 7-Segment LED Displays, you need two. Most of the time 330 ohm resistors will be used at the LED inputs. You've got two 7490 counters. If you're using LED Display, you can use 7448 Display Drivers (2 of those also). Take one of each IC...
  10. S

    Projector lighting not working right.

    I don't SEE any physical component damage. The disc/red components look like 'capacitors', but some might be something else (the part numbers on them can be Googled to identify them). Do you have a voltmeter? With the bug removed, are you seeing 12V at the socket (the bulb is probably running...
  11. S

    Simple question about a IC

    Google the data sheet for your 7490. I use the old printed data books from manufacturers, most of them give sample test and application circuits. I would assume the on-line data sheets do the same. I know you just want the answer. Looking at the data sheet gives us a wealth of information...
  12. S

    Projector lighting not working right.

    It makes sense to use a bulb capable of operating at a higher voltage than what the bulb socket is designed for when you're trying to extend the life of he bulb. A bulb filament operating at a slightly lower operating voltage is less stress on the filament, which would extend it's life. My...
  13. S

    Function generator and impedance

    I guess my point is that what type of function generator you use, matters. I referenced my own work in signal processing as an example of my requirements. I've never tried to drive a 4 or 8 ohm speaker with one in my work, but the fact that I need an impedance matching load of 50 ohms for my...
  14. S

    Ceiling fan speed?

    There are a lot of different types of dimmer switches, those SCR types were causing a lot of problems with the new CFL lights. I imagine the designs have been revised, trying to compensate for the new U.S. CFL rules for lamps. There's probably somebody out there making ones that will operate...
  15. S

    Function generator and impedance

    What's the model of your function generator? Most of what I do is signal processing. I can can get a reasonable output, but have to use a 50 ohm load to match my signal circuit inputs. Have you got a manual for your generator, and is it any help?
  16. S

    Projector lighting not working right.

    Alright, if it worked correctly for two days, then something blew inside the projector that blew the wall socket supplying the power to the projector: I would then assume something electrical inside the projector (Your 'Knick Knacks) was damaged, and that's causing an increase in the voltage to...
  17. S

    Projector lighting not working right.

    It looks to me like your projector lens is not focused. Can you turn the lens to adjust its length, or is there possibly an internal lens that can be moved in and out to focus. I realize you think the brightness has increased, but that may be because the lens distance from the bulb (and...
  18. S

    Beginner Project kit

    Google Ramsey Kits. I think they have a pretty good selection of electronic kits. It's good to start wth a kit, so you can learn parts recognition, how circuits are laid-out/connected, practice in reading schematics and learning to solder. You add to your skills as you do more hands-on...
  19. S

    Help finding antenna FM Transmitter

    Are you usng the correct terminology? Are you actually using an FM Transmitter, or are you trying to use an FM Receiver that you aren't getting a good signal on. (A regualar FM station radio) A transmitter/receiver radio is a transceiver. You've got to match the antenna to the radio for a...
  20. S

    UV Light box design

    If they didn't get specific in your instructions, it may be hit and miss when you fire it up. Be prepared to reset the distance as needed for your artwork. The composition of the surface of the artwork may also impact the UV illumination, as some composites might absorb different spectra.
Top