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  1. BobK

    Beginning electronics, understanding whats actually happening

    How to learn about active electronic components: 1. A diode is the simplest. Learn how it is used to rectify AC to DC and how it is used to combine logic signals. 2. Next, learn about the bipolar transistor. First as a switch, then as an amplifier, and finally as an oscillator. 3. Next...
  2. BobK

    New Product Prototype

    Okay. The PCB inside would presumably be for protection. But this is a battery optimized for high discharge rates, which you probably don't need. There should be batteries that are cheaper without that feature. Bob
  3. BobK

    How does a GPS receiver/transmitter (transceiver) work on a circuit board?

    Yes, if all you want is a high pitched sound, the piezo buzzer is ideal. They can be very small and loud and efficient, How you program the cpu depends on what type you use. For this app, I would think microcontroller would be sufficient and they are very low cost, low power. Cell phones...
  4. BobK

    New Product Prototype

    Quote the text here then, I did not see that. For some reason I get an unofrmatted screenfuls of text with your link. Bob
  5. BobK

    New Product Prototype

    I don't see anything that says it does, so I assume no. Bob
  6. BobK

    New Product Prototype

    A lipo battery will be damaged by discharging too far. But many have a built in protection circuit that prevents this, as well as overcharging. You should only consider those with protection. Bob
  7. BobK

    How does a GPS receiver/transmitter (transceiver) work on a circuit board?

    A cpu can pretty much make any sound you want digitally by simply manipulating an output pin. A simple square wave (i.e. on off repeat) is suitable for an alarm sound and is trivial to make. A codec is used for compressed audio streams, which is quite a different thing. Also if it is just a...
  8. BobK

    Switch help for my 737 simulator

    If you can figure out the ratchets and automatic locks, the switch part should be easy using lever switches and a cam. Bob
  9. BobK

    How does a GPS receiver/transmitter (transceiver) work on a circuit board?

    Nice,garublador! An audio codec is probably not required. The cpu can make an alarm sound easily. Bob
  10. BobK

    "Repair" mystery

    Well, Morticia agrees whit you. She believes in the magic smoke theory. The falls released the smoke, and my multimeter doubles as a smoke injector. Bob
  11. BobK

    "Repair" mystery

    No, I can take the batteries out and put them back in all day long and it will reset the timing correctly. Except it did not do so for the 3 candles that had fallen and gone off. So there is some difference there. I can see that a very short interruption when the hit the floor and the...
  12. BobK

    Question regarding ic / microcontroller chips

    A transparent latch operates somewhat like your description. It has ins and outs and an enable input. When the enable is high, the outs pass through the data from the ins. When the enable is low, the last value of the outs is frozen and changes to the inputs are ignored. Do not think about...
  13. BobK

    Home stereo compatible with 12v campervan?

    Automotive electronics is designed to deal with the voltage spikes. Bob
  14. BobK

    Bad quality breadboard?

    Problems with bad contact in breadboards is usually caused by inserting wires that are too big and bending the contacts. Bob
  15. BobK

    Two appliances, Two switches, one switch to power one and second switch to power both???

    Or, easier, use a DPST switch for the second one. Bob
  16. BobK

    Super Simple Circuit questions

    He meant between the switch and the capacitor, on either side. Not across the switch as in your diagram. Bob
  17. BobK

    "Repair" mystery

    The timing starts when they are powered on and they repeat the 24 hour cycle as long as power is maintained. If you switch them off and on, the timing is reset. Edit: Interestingly the timing appears to be crystal accurate. We powered them on in sequence then placed them in the windows so...
  18. BobK

    Stage Line 500W amp repair project

    Cool. I am betting Adam will have a success. Bob
  19. BobK

    IP video camera.

    The box that plugs into the wall should be marked with the output voltage and current. Bob
  20. BobK

    "Repair" mystery

    This year, for the holiday season, the lovely wife Morticia and I put these nifty LED candles in each window of our house. They have a flickering LED "flame" on top, two AA batteries, a switch on the bottom. The bulb screws into the candle shaft and has a circle in the middle of the bottom...
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