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  1. J

    Mixing optical sound cable with 3.5mm cable

    Does anyone know if there is a way to mix a 3.5mm audio line into a optical sound line? I have a sound bar and from my TV I have connected a optical cable to the soundbar. However, I have a Amazon Echo Dot which i would like to connect to the same speaker. Although the sound bar has another...
  2. J

    Combining 2 audio outputs into 1

    I've received the device, it's essentially 3 stereo sockets with resistors soldered in parallel to the two combining sockets. I drew up a diagram showing how it's wired. And it seems to work well. Audio volume is low if i try and listen on the headphones but on a soundbar or amplified speaker...
  3. J

    Combining 2 audio outputs into 1

    I have 3.5mm audio outputs from two different devices. One is a TV and the other is amazon echo dot. I need to connect them to my sound system on the same 3.5mm input channel. Now from what I have read it is not safe to use audio splitters for this purpose as the output of the two devices might...
  4. J

    Turning LG smart tv off on the mains

    I want to connect my LG smart TV to a samsung smartthings smart power socket so that I can turn the tv on and off with the app and voice command. Question is, is it safe to just turn a tv off at the mains without putting it into standby first?
  5. J

    Relay to turn off power instead of on.

    Awesome, i'll try that. Thanks.
  6. J

    Relay to turn off power instead of on.

    I have a 12v supply coming from the cigarette/accessory socket from my car going to some LED lights. This turns on as soon as my car is turned on. However, I want this 12V source to turn off when my sidelight +12v line becomes live. I was thinking of a relay but that wouldn't work because a...
  7. J

    Solar Panel and 12V Deep Cycle Battery advice

    Thanks for your reply. I already have two 20w panels. And seeing as in winter months we don't get much sunshine and the nights are longer it means the led lights will run for longer. So by having 2 panels I assumed it would be a safer option. And having the panels wired to a charge controller...
  8. J

    Solar Panel and 12V Deep Cycle Battery advice

    I have a 12v 100Ah deep cycle battery which will be connected to a 10A 12V Photocell Switch that will power about 10x 1w LED lights in the garden at night. To keep the batteries topped up I have a small limited space on top of a pergola that I want to place 2x 20W monocrystalline solar panels...
  9. J

    Micro USB port pin configuration

    I have a damaged Micro USB port on my Android Tablet which I would like to remove and then I would like to cut the micro USB connector of from a OTG cable and directly solder it to the board. However, I need some help because i've cut a few spare USB cables and they all have 4 wires inside...
  10. J

    Help calculate power usage

    Thanks.
  11. J

    Help calculate power usage

    Sorry, does that mean i'm using 6.6mA per hour? or 6.6mA in 24hrs?
  12. J

    Help calculate power usage

    Many Thanks
  13. J

    Help calculate power usage

    It does, because I have the tablet with a custom ROM designed to put it to deep sleep and the main purpose of the ROM is to preserve battery and it does exactly that. It's claim is maximum 4% draw over 24hrs of sleep. The actual battery says 3.8V but when i measure the voltage draw from the...
  14. J

    Help calculate power usage

    Thanks for that great write-up. The drain that I was trying to calculate is during the time when the tablet is in deep sleep. So over a span of few days I've been monitoring it and the highest consumption was 4% over 24hrs. While the tablet is on, this will be much higher depending on use but...
  15. J

    Help calculate power usage

    It's not exactly 5V it's just under 5v it's around 4.3-4.5v.
  16. J

    Help calculate power usage

    Can anyone kindly help me calculate power consumption based on the following: If I have a 5v 3950mAh battery powering a Tablet, and over a 24hr period i lose 4% battery. I am going to be replacing this battery and run directly from a 12V car battery using a 12v to 5V converter. What would the...
  17. J

    USB power for tablet and a USB hub

    Thanks.
  18. J

    USB power for tablet and a USB hub

    Hi Martin, The 12v to 5v converter is the only device that receives the 12V supply. From this converter, the red and black which are +5 and GND are going to the Tablet to charge it only, at the same time from the same converter it is powering the optional external power input for the USB hub...
  19. J

    USB power for tablet and a USB hub

    I have the following USB configuration which takes +12v from the car which goes through a converter to reduce to 5V. It seems to work fine without any problems. But my only concern the part where the same power from the converter goes as an external power source to the USB hub. So technically...
  20. J

    reducing 5V to 4v or 4.2v MAX

    Thanks for that info. I take it this has a higher forward voltage drop? whats the typical voltage drop from a very law current draw to something like 3A current draw? Also, do these generate heat? I know the 1N5822 don't generate too much heat. In fact the 1N5822 seems to generate very little heat.
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