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  1. J

    2 relays with a shared common

    Still a little confused after looking at your diagram with the final connections to the relay. Is it something like my diagram below? i think something is wrong :eek:
  2. J

    2 relays with a shared common

    Thank you @Harald Kapp I've tried to visually understand it by putting your decoupling example into my diagram below. But i'm little lost at the transistor part. I believe a transistor has 3 pins, which pins will connect where and how does it connect to the relay? Also, is R1 and R3 a 475ohm...
  3. J

    2 relays with a shared common

    What about adding a signal diode and a 4700uF capacitor in line across the PWM positive and negative terminals as pictured below? Or are there any types of relays that can handle PWM? So that I can possibly just put a different relay for the second relay? i read something about solid state...
  4. J

    2 relays with a shared common

    OK so you are right, Power source 2 is from a PWM circuit. Basically let me explain what i'm trying to achive: This is to power a LED unit on a car. The Power Source 1 is +12v ACC Ignition which when it's live it lets the +12V feed turn on the LED. I also have a puddle light or approach lights...
  5. J

    2 relays with a shared common

    The reason I say its varied is because when I measured voltage with a multimeter it climbed up to 12V and then climbed down when turning off. This made me believe it is being varied. Any guidance on how I can do this in my above relay diagram scenario? Thank you.
  6. J

    2 relays with a shared common

    Power source 2 provides powers to a 5W bulb but it fades in and fades out. I believe it does this by adjusting the voltage that eventually rises to 12V and then fading out it goes down from 12V to off position. Question is, will a regular relay work under these voltage fades? is there a...
  7. J

    2 relays with a shared common

    Thanks MS Paint :eek: lol
  8. J

    2 relays with a shared common

    I've got the following relay design where I've got two relays sharing the same common directly from +12v of a car battery. The relay coil is powered by two different circuits. In most cases only Power Source 1 or Power Source 2 will be on. However, there will be occasions where power source 2...
  9. J

    Door Bell Chime Transformers - UK

    I have a hard wired door bell chime. It's been running for about 10-11 years since it was installed in my new-build house. I removed the cover to inspect the transformer and the transformer is rather hot. I've been inspecting it for a few weeks now and it's always hot. Not hot that it will burn...
  10. J

    Powering device with Cat5e data cable

    The length is no more than 2meters max. It's an existing wire used for a door bell. Only two of the eight are being used for the bell push button.
  11. J

    Powering device with Cat5e data cable

    The length I would say is about 2meters max. The needed current is around 600mA. So I should be ok merging two cables for +12v and 2 for ground? Or shall I play it safe and merge 3?
  12. J

    Powering device with Cat5e data cable

    I need to run 12v DC power through a cat5e cable. Does anyone know the maximum amps a single cable can carry? There are total of 8. I'm using 2 for door bell and I need to use the cat5e if possible so that I don't need to externally run a new cable. So I have 6 spare. It one isn't good enough...
  13. J

    Help measuring resistance of fuse with this multimeter

    by 400cCC do you mean like the one I illustrated in the following pic? and also, do I keep the probes connected as they are currently?
  14. J

    Help measuring resistance of fuse with this multimeter

    I have a rather old multimeter. I've attached a photo. I am diagnosing an issue with my car. The user guide says to remove the fuse and measure resistance between the terminals and it asks: Is the resistance vale 1 Ω ± 1 Ω? Can anyone kindly guide me through how I can use my multimeter to...
  15. J

    Combining 2 +12v wires in the car

    I need to power an LED in the car from two power sources. One is from the IGN which activates when ignition is on and another is from a puddle light source which activates when you are near the car. Only problem is the puddle light stays on for a few seconds even after the ignition is turned on...
  16. J

    Programmable Microcontroller with relays

    I'm completely new to programmable microcontrollers. I am looking for a solution. I would like some sort of device that is always on and powered with 12v power source. The device also then has a completely standalone additional 12v trigger from a completely different power source. When power is...
  17. J

    Combining 2 audio outputs into 1

    But I completely turn off the TV at the mains and unplugged it until the standby light turns off. By changing direction of the 2 prongs and changing the polarity I assume that isn't a problem as technically those figure 8 prong connectors can go in either way meaning the TV should be able to...
  18. J

    Combining 2 audio outputs into 1

    When I connect my TV headphone jack to this device it mixes the two sources fine. However, if I turned my TV off whether its in standby or completely turned off at mains, I get a very annoying humming/buzzing sound. If I unplug the 3.5mm cable from the tv then the noise disappears. Is this some...
  19. J

    Mixing optical sound cable with 3.5mm cable

    Thanks, instead of mixing the toslink and the 3.5 analog line, i'm thinking to add another pair of speakers for the analog line which will also have toslink input. The toslink output from my TV currently goes into the soundbar. If i wanted to split the toslink connection so that it goes into the...
  20. J

    Combining 2 audio outputs into 1

    The device seems to work good, the resistors that are in the unit have a colour band of red, purple, red and gold. What resistor is this? i'm thinking off making the same thing but inline using just the wire instead of a bulky box. Also, does anyone know if there is a way for me to amplify one...
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