Recent content by john2k

  1. J

    momentary pcb switch question

    Actually I just had a look at the wiring harness that connects to this and it appears the two led pins and the middle column is used. The column at the end isn't actually used. Which means all 4 switches are switch via the two pins.
  2. J

    momentary pcb switch question

    Here's a picture below of the PCB. the two pins for the LED backlights i have indicated. The remaining 4 pins can only be related to the buttons that i've labelled. Because the PCB has no other function. When a button is pressed some sort of connection is made on the connector which the...
  3. J

    momentary pcb switch question

    I have a small PCB with 4 momentary pcb small switches the ones that when you press it, it briefly completes the circuit until you let go. There are also some back light LEDs. There is a 6 pin connector on the PCB. Two of the pins on the connector are for the + and - of the LEDs. I've tested...
  4. J

    Amplifying speaker without amp or power supply

    I have a PoE IP telephone which has a mini built in speaker. I've removed the speaker and picture of it is below. It's basically a 8Ohm 1W speaker. I removed this speaker and wired up a bigger 8ohm speaker rated at 20W. Ofcourse it's not receiving 20W because the phone is underpowering it...
  5. J

    LEDs and water and moisture ingress

    I want to use a few 3mm LEDs with holders to provide back light for car door handle. Water and moisture ingress is going to be the biggest problem. But if I was to drill a hole and surface mount the led holder then pop the led in from the rear. Technically is the front some shaped resin bit of...
  6. J

    Adding hardwired auxiliary input to car radio amp

    lol, so only other option would be to have some seperate spare tweeter speakers or something hooked up to a mini amp just for the aux announcements and leave the main system alone?
  7. J

    Adding hardwired auxiliary input to car radio amp

    I've been trying to locate service manual for the radio and no luck. I have the manufacturers schematics but that shows how it's all hooked up and which connector pins are what. It doesn't show the internals of the radio itself.
  8. J

    Adding hardwired auxiliary input to car radio amp

    Another possible solution I'm thinking is could I potentially add a mini compact 12v amp somewhere (one of those really compact ones) and somehow have my compact amp also feed audio out to the front two speakers? Because the auxiliary input is really for navigation instructions and other...
  9. J

    Adding hardwired auxiliary input to car radio amp

    Looking for some help and advice. My car radio unit has a built in amp and has 8 wires going to 4 pair of speakers. It also supports a 3.5mm audio aux input. However, the 3.5mm aux input is treated as a source and I can only hear it when I'm in that source itself. So if I'm listening to the...
  10. J

    TS to TRS microphone

    My usb sound card requires a TRS microphone and I have a TS mono microphone I just want to test if it actually works before buying a TS to TRS converter. If I wanted to temporarily adapt it with a TRS connector the ground will be the sleeve and the tip will be the same I'm assuming but what will...
  11. J

    3.5mm stereo audio jack

    I have a 3.5mm stereo audio cable cut on one end where I have to directly connect it to a left, right and ground connection. However I'm a little confused as to which pins from the stereo jack are what. From what I understand starting from the base of the 3.5mm jack is the ground and then the...
  12. J

    Speaker & Amp Impedance Question

    I have some 8ohm impedance speakers and I have an amp that has output of either 50W at 4ohm or 40W at 8ohm. If connect two of the 8ohm speakers to the single output in parallel that would make the total impedance 4ohm. 4ohm is something the amp supports but question is will the speaker support...
  13. J

    Wire rating for HID headlight ballast

    It's a D1S bulb which I believe is a 35W bulb. The original wiring running to inside the headlamp is made for a 55W halogen bulb. I'm not sure what the current draw for the ballast is. The wire to the first bulb will probably be something like 40 to 50cm and the second will be more like 200cm.
  14. J

    Wire rating for HID headlight ballast

    I have a 40A 12V relay which I am using to provide a direct +12v feed from car battery to power 2x HID xenon bulbs. The wire from the battery will go from the battery to a waterproof blade type fuse-holder, then it will go to pin 30 of the relay. The output on pin 87 I then need to take to 2x...
  15. J

    NE555 Texas Instruments Pinout

    Thank you.
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