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  1. KrisBlueNZ

    Homemade Battery monitor for 4 x 3.2V cells

    Hi there and welcome to Electronics Point. The link in your post doesn't work - gets a server not found error. Do you have a link to the data sheet for that IC? Or can you post the data sheet as an attachment to your post using the Upload a File button?
  2. KrisBlueNZ

    How to set up a Beacon light to run from the mains

    Yes, it's Kris. I like the racing car bed too! My sister bought her boy a bed like that but it wasn't half as good. You're welcome Lewis :-) It's a pleasure to help someone with a good attitude and some initiative and common sense. What do you do for a job?
  3. KrisBlueNZ

    LED control box

    OK, here's my design. The circuit uses two ICs, both from the CMOS "CD4000" series. These are old technology but still available and still used nowadays. U1 is a CD4093B aka HCF4093B, and is shown as four separate "D"-shaped items on the schematic, named U1A~U1D, called "NAND gates". U2 is a...
  4. KrisBlueNZ

    How to set up a Beacon light to run from the mains

    That's really cool! I wish I had had a spaceship bed when I was a kid! I was a big Star Wars fan. (For about six months...) Those photos look cool! Your son is going to LOVE it! You have a good attitude. We do have some users that we consider a burden, but you are nothing like them. As long as...
  5. KrisBlueNZ

    74HC393: 4-Bit Counter in need of debounce?

    Debouncing is only needed when bounce is present. Bounce occurs because mechanical contacts don't close cleanly. So you don't need any debouncing. I couldn't make much sense of the video, sorry. I would use 10k for your pullup resistors, not 1M. 1M should be OK though. Do you have a...
  6. KrisBlueNZ

    Motion sensor

    Hello there and welcome to Electronics Point. Are you aware that spying and spy equipment is one of the subjects that is banned from discussion here? If your project is not a spying device, please describe the whole project and put your location in your profile so we know what suppliers to...
  7. KrisBlueNZ

    5 V to 1.7v (in SPI)

    At an SPI frequency of 1 kHz there will be no problem at all. Clock and data don't change at the same time anyway; there is always a 90° phase relationship between them. So at 1 kHz, SPI will work with a timing skew of as much as 250 µs. The display driver's input capacitance is not specified on...
  8. KrisBlueNZ

    3 switch functional prop.

    Hi there and welcome to Electronics Point :-) Could you point us to a clip that shows what a "Follower" is supposed to operate? Can you post manufacturers, part numbers, and links to data sheets for any components you already have, such as the voice module? Can you add your location in your...
  9. KrisBlueNZ

    Selecting PWM Freq for Speed DC Motor Control

    Well, it would, if you didn't put a whole lot of capacitance across the load. Look at a diagram of a standard PWM circuit. There isn't much, if any, capacitance connected across the load. You do need a diode across the load though. I don't know if it would be practical or not. Those power...
  10. KrisBlueNZ

    Rain Sensor Status

    Learning curves... Take them slowly... ... or you may find you're in over your head!
  11. KrisBlueNZ

    Dynex DX-L42-10A Intermittent Issues

    The one I linked to, http://www.digikey.com/product-detail/en/AP1117EG-13/AP1117EGDICT-ND/1301524, is available in 1-up quantity and is the best option. The LM1117DT-ADJ is in the wrong package; you want the MP suffix, but that's more expensive than the AP1117EG and has a lower current rating...
  12. KrisBlueNZ

    Parallel Pin Connections

    You're welcome. Maplin has: Green LED: http://www.maplin.co.uk/p/5mm-green-led-ck37s Resistor 3k3: http://www.maplin.co.uk/p/metal-film-06w-33k-ohm-resistor-m3k3
  13. KrisBlueNZ

    Dynex DX-L42-10A Intermittent Issues

    The E in the suffix means SOT-223. Is that right? The "-13" suffix is a red herring. Sorry about that! The important thing is that there's no voltage marked between the E and the L in the suffix. So you need http://www.digikey.com/product-detail/en/AP1117EG-13/AP1117EGDICT-ND/1301524. The one...
  14. KrisBlueNZ

    Parallel Pin Connections

    Hi Bradley and welcome to Electronics Point :-) If pins 3, 4, and 7~10 are driven by NPN transistors and are described as active low, most likely they are "open collector" outputs. Inside the device, each output has an NPN transistor with its emitter connected to the 0V rail (pin 1 of the port...
  15. KrisBlueNZ

    PC Speakers malfunction. Need help

    I'm interested in the ones that you marked with a question mark. I'm not totally sure that they are actually capacitors! I think they may be PTC resettable fuses, despite the marking on the PCB. If there aren't any resettable fuses, I guess it's possible that the diodes are failing under load...
  16. KrisBlueNZ

    Dynex DX-L42-10A Intermittent Issues

    The pins on the AP1117ADJ are numbered 1~3 from left to right when looking at the front of the package with the leads pointing downwards. Pin 3 (rightmost) is the input. So it makes sense that pin 3 would have 3.3V on it, and for pins 1 and 2 to have 0V on them, when the regulator is removed...
  17. KrisBlueNZ

    PC Speakers malfunction. Need help

    OK, can you post the markings on the three disc-shaped mustard-coloured devices indicated by the arrows. Also if there are any more similar-looking components nearby, post the markings on them too. Those photos aren't the best to work from. Can you take a photo of each side, with the camera...
  18. KrisBlueNZ

    Hi all!

    Me too. Although I don't burn as bright as I used to :-/ LOL
  19. KrisBlueNZ

    some advice would be great

    You need something to boost the current capability of the potentiometer. There are several options, many of which are nicely presented and described at this page: http://www.pcsilencioso.com/cpemma/ef.html Those options are all "linear" regulators - a transistor conducts more or less, to...
  20. KrisBlueNZ

    PC Speakers malfunction. Need help

    When the unit has stabilised, what is the voltage across each electrolytic? You said one of them drops to zero, but what about the other one? In that state, can you also measure the AC voltages on the 3-pin connector from the transformer - measure between the middle pin and each side pin...
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