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  1. Martaine2005

    point me in the right direction

    Hmm, me bad. Bicycles don’t have steering wheels!. When I mentioned ‘wifi’, I wasn’t meaning internet. Some devices can connect to your ‘personal’ wifi. Device direct to your phone just like bluetooth. My dashcam does for example. Regarding vibration, I meant the screen. Racing around and your...
  2. Martaine2005

    Two unrelated questions

    Thanks AK, very informative. I am looking more at thermal conductivity than voltage insulation, so I will continue using paste. Re the ‘display’. What I mean is the actual front transparent(ish) red, green or blue plastic diffuser in which the 7 segment LEDs can be seen through. Thanks again...
  3. Martaine2005

    Two unrelated questions

    Hi guys/girls, I have two unrelated questions that I thought I would post here. The first is with regard to thermal paste vs thermal pads. Are there advantages or disadvantages to using one or the other?. I will be using one or the other for output transistors and regulators to heat sinks...
  4. Martaine2005

    point me in the right direction

    Thinking aloud, you could use bluetooth or wifi and connect it to your phone on the handle bars. My dashcam is wifi and connects to my phone for play back. Just another avenue you might like to look into. Martin
  5. Martaine2005

    point me in the right direction

    ^^ Oops I meant as @dave9 suggested. Martin
  6. Martaine2005

    point me in the right direction

    Hi coleio, Look on Ebay for pin hole camera or button hole camera. Also have a search for ‘nanny cam’. These are tiny cameras mounted on a tiny pcb. They have connections for power and signal out. Then just find a small lcd or tft screen. I think you’ll find vibration a big problem though. You...
  7. Martaine2005

    Voltage regulator voltage too high

    Hi Chumply, linear regulators like the 78xx series usually require a load in order to regulate correctly. The datasheet will have this information. Try a 1K resistor as the load to verify whether this is the case. Also try without the caps. Caps are usually only required if the input voltage is...
  8. Martaine2005

    Switches/LED's on 120v

    A simpler method would be to use ‘Home Automation’ like ‘Byron’ or ‘X10’ modules. There are also Apps for automation. All can be done from a SAFE distance from mains voltage. You have each item plugged into their own module and the extension lead plugged into one also. These modules are just...
  9. Martaine2005

    Oscilloscope for dummies.

    hi guys/girls, I am fed up with Youtube videos omitting very important steps while connecting and disconnecting the probes. I understand the ground issues. That is all very clear. I have 2 oscilloscopes. 1 analogue and 1 digital. My analog is a 4 ch, 200mhz Fluke. My digital is a cheap chinese...
  10. Martaine2005

    Light bulbs as dummy load for Stereo ?

    True. Martin
  11. Martaine2005

    Radar detector smart cord circuit

    I suppose it would depend on what the RJ11 signal is on B. And what the RJ11 signal is on Y. My guess is that there is more to this in the 'passport'. The alert LED is receiving a signal from B and the power LED blocks it. The transistor switches on/off during detection via Y causing alert LED...
  12. Martaine2005

    Light bulbs as dummy load for Stereo ?

    Why would you want to put a bulb in place of a speaker?, A 120v, 60w bulb is 240 Ohms.... Martin
  13. Martaine2005

    Auto radio keeps restarting when theres no key on ignition

    Can you please try what I asked first as this will eliminate the need for second guessing. Martin
  14. Martaine2005

    Is this a THERMAL CUT-OUT?

    Thank you Dave and Harold. I will stick with my gut instinct that they are NTCs. I was just curious as I have never seen one like this before. Martin
  15. Martaine2005

    Auto radio keeps restarting when theres no key on ignition

    Is the radio the cars original set or is it third party unit?. The yellow wire is normally connected to constant 12v for memory presets and clock etc. The red wire usually through the ignition or acc circuit. Try with the car battery again (directly) and just connect the red + and - leaving...
  16. Martaine2005

    Is this a THERMAL CUT-OUT?

    Here is the little device. It took several attempts to re-size the photo. There are no numbers or codes on it. I just noticed it's not quite focused, But that is the best I could do with my phone. Martin
  17. Martaine2005

    Is this a THERMAL CUT-OUT?

    Thanks for a quick reply. These are definitely floating in the wind. I did suspect an old NTC by it’s change with temperature. It’s just that I have never seen one like this before. Martin
  18. Martaine2005

    Is this a THERMAL CUT-OUT?

    Hi guys, I have two identical 1:1 240v transformers which I believe are from UK bathroom light with shaver socket. In series with the LIVE (hot) to the transformers are little round devices about 8mm x 3mm thick. I have Checked them and they are both around 40 Ohms. Putting pressure both sides...
  19. Martaine2005

    WheatStone bridge

    @Ratch I really want to say that you have too much time on your hands. You can hi-light a physics question and tell the forum they are wrong. Current flow in the physics world is incorrect. However, current being a quantity, can flow. So, the current to flow (quantity) is acceptable. IMHO.
  20. Martaine2005

    WheatStone bridge

    @Ratch I know technically you are correct. But you have to remember that this is not a physics forum. Every member here is probably guilty of answering an OP question by "current flow".. This is a 'help' forum. And we
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