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  1. Martaine2005

    Microphone inside car.

    Hi Andy, No, don't worry about it for now. Your audio in may require a further stage of pre amp. But that is more than likely your problem with the other mics. Over modulation. So keep it simple to start with. Then we can add to it to get it just right. Martin
  2. Martaine2005

    LED power supply help

    Hi Ian, Glad it all worked for you. Hope you insulated the connections properly... Yes, you can certainly use a 555 to do that. It's a real easy circuit and you can choose or work out what flash rate you like... I will find a real easy video for you to follow and post it here. He is a great...
  3. Martaine2005

    Simple stall over current 12v dc motor protection?

    Minder, Post #1 Martin
  4. Martaine2005

    Power Resistors Value

    Erm, 8.5Ω :D EDIT: Just saw your edit!!
  5. Martaine2005

    Help with a wiring circuit

    Something like this should work. Just omit the limit switches if you don't need them.
  6. Martaine2005

    Help with a wiring circuit

    Hello, Sorry, that diagram is confusing.. The up and down buttons are only for motor direction. Two simple circuits using relays for the motor, one relay connects the motor wires for "forward" and the other relay with reversed wire connections to "reverse" the motor using the two switches by the...
  7. Martaine2005

    incorrect load on soldering iron transformer?

    It's like a lottery buying "knock offs" from China. I watched a documentary on Chinese fakes. Something that costs a small fortune for branded items in one factory is being made un-branded right next door!! Using exactly the same components. A perfect clone without a brand name. However, next...
  8. Martaine2005

    Regulate from 12v to 3v?

    Hi Crogdor, Tha fios agaibh has the answer for your existing 5v regulator. Put a lm7803 regulator in circuit too. Or use the 3.3v regulator and put a shottky diode in series to drop the .3v. Either way will work. But you don't know if your key fob will cause other problems by being constantly...
  9. Martaine2005

    Powering a mobile FM transmitter

    I think he is fast on his bike!!! The small villages they pass wont mind a little "pop" music interference!
  10. Martaine2005

    Hi fellas

    'Ello Bruv' and welcome:)
  11. Martaine2005

    LED power supply help

    Haha, You should have responded "if the leds don't work" rotate the DC plug connections!!:D Martin
  12. Martaine2005

    Microphone inside car.

    It's only a small "childish" side..:p Yes, the caps can be played with as with the resistor too. It could mean adding a first stage amp. Don't worry though, just a transistor and two more resistors. Still under a £1.
  13. Martaine2005

    Microphone inside car.

    The other two are!! You can start with a simple electret mic, resistor, capacitor and rca connector. The electret mic has already got a built in transistor (amplifier) of sorts. A resistor approx 10k to 20k from the 12v to load the mic's + terminal. Negative to Grnd. A 0.1μf ceramic to 1μf...
  14. Martaine2005

    How can I hook up my usb speakers to a battery pack?

    Good, always check the voltages..:) Martin
  15. Martaine2005

    How can I hook up my usb speakers to a battery pack?

    Usb is 5v. 1.5v battery is too small. Martin
  16. Martaine2005

    Need help with heating element

    Now put that in your pipe and smoke it.:p Martin
  17. Martaine2005

    LED power supply help

    What difference would that make if it's ac?
  18. Martaine2005

    LED power supply help

    Never mind. The ac from the transformer doesn't have polarity. Just connect the wires to the tilde sign.~.on the rectifier. The led wires should be easy to figure out. If you look closely at the led, you will see a flat spot on one side. That is - or the cathode. The + or the anode of the led...
  19. Martaine2005

    Microphone inside car.

    Hi Andy, Some good advice given by the above two members! However, when you say you have tried CCTV mics, do you mean the bullet type electret mic? CCTV (electret) mic's are usually amplified because they need to pick up sound from a distance. This would obviously pick up every sound in confined...
  20. Martaine2005

    LED power supply help

    Hi Ian, You can check the + and - on the controller easy enough, the + will go up to the diodes. The - from the leds will go to the two PCR 406's. It should be easy enough to follow the tracks back. You will need to remove the bottom black plastic section to confirm + and -. Martin
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