Search results

Search Forums New Posts
  1. kellys_eye

    Anyone know of any microcontrollers which can communicate via radio?

    ALL microcomputers can communicate over radio. They are usually separate things anyway. The microcomputer will use a serial data signal that is fed to a transmitter circuit that does the rest. More specifically it will be a transceiver as you need bi-directional communications for a drone...
  2. kellys_eye

    Do SMD resistors fail open after some time?

    Potentially, and I mean potentially, there could be thermal flexing of the resistor - enough to cause the 'end caps' to be pulled away over time. It's indicitive when you state that only the OEM parts, not the fitted replacements, suffer these faults. Poor QC, dodgy suppliers etc many b the...
  3. kellys_eye

    Modifying 4.5 V (alkaline) lamp to run brighter with 3.6 V (NiMH)

    Fit a 2.5V bulb....
  4. kellys_eye

    Do SMD resistors fail open after some time?

    New one on me. Never heard of this as a cause nor come across any examples. It may be a manufacturing issue - to hot a solder reflow or issues with lead-free solder perhaps?
  5. kellys_eye

    Whirlpool topload washer motor

    Check out Youtube for videos on how to reuse washing machine motors - they also explain what the various wires are for.
  6. kellys_eye

    Smoothing a charging current for a phone?

    No comment on my post re the solar recharger link? (post #10)?
  7. kellys_eye

    Electronic Circuit error

    How the heck were we supposed to know that? Because you didn't have the track break at D15 (or 16, 17, 18etc) you've managed to connect AC to the output of the 7812. No wonder it doesn't work! Show us your ACTUAL layout i.e. the soldered board. Why don't you skip the transformer, rectifier...
  8. kellys_eye

    Electronic Circuit error

    Not the X between the two ~ symbols....... There should be a X below the lower ~symbol otherwise you're shorting that ~ point to the negative rail via the LED.
  9. kellys_eye

    Electronic Circuit error

    The OP states that 14V AC is put to the board at the points marked ~. The lower ,~ point needs a break in the track as it connects to the LED (which it shouldn't). There may be other issues.....
  10. kellys_eye

    Please help: Build for GPS tracker with SOS signalling

    Whatever the difficulties of the situation I don't think GPS location is going to achieve anything other than additional frustration at not being able to implement it properly. @davenn is in agreement her and, like him, I have 40+ years experience and wouldn't be looking to a DIY soluion to this.
  11. kellys_eye

    Smoothing a charging current for a phone?

    As per @Alec_t in post #3 you need 12Whr of energy. A 1W solar panel could do this in 12 hours or a 3W panel in 4 hours. How long do you want it to take? There are many 'geeky' solutions on the market such as this...
  12. kellys_eye

    Please help: Build for GPS tracker with SOS signalling

    I don't know what a tracker could do to mitigate the situation anyway. If a 'bad guy' wanted to do a number on your GF a tracker/alarm wouldn't stop them - in fact how long do you reckon it would take 'you' (or plod) to reach her to rescue her? Quicker than a good kicking? knifing? worse...
  13. kellys_eye

    help! Unknown prong type!

    yup - missed that so your recommendations are correct.
  14. kellys_eye

    Smoothing a charging current for a phone?

    Not for me to question your use but personally I'd use the phone once a day to 'check in' otherwise keep it off unless for an emergency. With a spare battery (fully charged) you could go for a week(s?) without recharging. Either way, given the 'bush' location I'd be looking at a bigger/better...
  15. kellys_eye

    New Topward 8112 Service Manual with good quality Shematic pdf

    Thanks - this kind of post could be very useful to someone.
  16. kellys_eye

    Smoothing a charging current for a phone?

    Solar panel outputs are always, always stated as the 'best possible under the sunniest conditions' and rarely represent what you get in the real world. If you take HALF those stated values you'll be lucky to get them..... The hand cranked output will be more realistic in terms of stated output...
  17. kellys_eye

    help! Unknown prong type!

    12V @6W refers to the motor only...... That lamp looks to be a typical 12V halogen and they are rated at 35W to 50W (in my experience) so an additional 3 to 5 A would be essential for the power unit. 12V AC at 5-6A seems appropriate.
  18. kellys_eye

    Please help: Build for GPS tracker with SOS signalling

    I call BS on this. No one in this country should be suffering the kind of 'abuse' the OP claims. Show me evidence of the situation - if you have any then the authorities would be on top of the situation immediately and I have no doubt the media would be more than interested in it too. Sounds...
  19. kellys_eye

    PCB, Toner transfer method

    Before the proliferation of 'next day' PCB manufacturers I used to make my own using the toner method. The good old laminator worked just fine - so does the iron but it takes a lot of effort to get right! Nowadays, if I wanted a PCB I'd be using those next-day services as they are far cheaper...
  20. kellys_eye

    help! Unknown prong type!

    Sourcing a 2-pin DIN socket may not be easy. On many occasions such as this it is cheaper and easier to change both the plug AND socket for something more readily available. As to the AC adapter, it is obviously a DC output (hence the polarised plug) and 12V is a common voltage but this is...
Top