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Recent content by maxg

  1. M

    current sensing

    3 led, red green and what ever I need a middle point and then 3 A above and below, the middle point be at 8 A
  2. M

    isolating a 12 V relay

    12 V relay isolator quite correct I used a 1n4001F and the transistor look ok so far, I haven't try to disconnect the alternator as there are 5 wires so you don't prove any thing but I have re connected the alternator directly and the same thing hapen, the transistor is not so fast so I don't...
  3. M

    current sensing

    does any one know of a simple device that sense current and give 3 ouput right current, to high or to low. around the 8 to 10 A thanks
  4. M

    isolating a 12 V relay

    isolator relay well it did work! I have used a NPN transistor 500mA IC current, a 2k7 load resistor on the base side and a 20V .5A diode across the relay for protection, the battery charge light stay put, and my circuit working. thanks
  5. M

    isolating a 12 V relay

    relay isolator I have measured the relay 80Ω, so I am going to try an NPN transistor 200mA current and 2.2 KΩ load resistor from the alternator side plus a diode across the coil for back EMF protection I'll let you know if it work, I still can not find the impedance between the base and emiter...
  6. M

    isolating a 12 V relay

    it is the output of a car generator, there are 3 wires coming out, one have 12 V always on, the second have 12 V after you turn the key once, the last have 12 V when the engine is running, I want ot connect a relay to this wire, but if do that the faulty battery charge come on, so I assume that...
  7. M

    isolating a 12 V relay

    I need to connect a 12V relay to a circuit that provide the 12V under specific condition, but the coil of the relay change the charateristics of the circuit, how do I isolate the relay from the circuit? i have access to 12V dc power. thank you
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