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  1. C

    Absolute Maximum Values

    You put the transistor on a large heatsink and turn the project ON. If the transistor blows up, the wattage dissipation is too much. Feel the heatsink after 10 minutes. If you can hold the heatsink, the ratings are ok.
  2. C

    Circuit to make Car Head Lamp Brighter?

    "small device installed in his car to increase the brightness of the head lamps. " You need to find out the cost of the device and a link on the web to identify the item.
  3. C

    Electronics engineering

    You need to start by building dozens of projects.
  4. C

    Safe distance to look at a 950mn 5w Infrared LED from?

    Do you mean: "look at" or "look into."
  5. C

    Hartley oscillator

    That's not the way things work. Do you want the oscillator to "just work" or do you want to put a load on it and what output amplitude do you want as well as the frequency. You just don't go and buy a pile of bricks and straw to build a house.
  6. C

    Hartley oscillator

    What output voltage swing do you want
  7. C

    LEDs in series?

    You can simply try my suggestion by measuring each one in turn without desoldering anything.
  8. C

    Which one has the lower noise level？Wheatstone bridge or direct measurement?

    The noise depends on the type of resistor, the current, the ambient temperature and the number of resistors. Also the noise from the power supply and the voltage of the supply as this affects the value of each resistor.
  9. C

    LEDs in series?

    Try each LED on 6v with a 10R resistor (all at the same time - they are in parallel - all are classified as separate circuits) to see if they all have the same brightness. This is where you start.
  10. C

    Running a motor at lower voltage - what will happen?

    My answer is axiomatic.
  11. C

    Running a motor at lower voltage - what will happen?

    The motor will take less current and the torque will be reduced. If you are driving a load, the RPM will be reduced.
  12. C

    HELP! Wind-up torch charge

    What you are asking is very complex and more than the cost of the torch. Just wind the torch for 1 minute and see how long the globe lasts.
  13. C

    Can anyone identify this transistor?

    It maybe a PNP transistor You need to do my finger test
  14. C

    3.7V 18650 battery

    A little knowledge is a DANGEROUS thing.
  15. C

    SO Im a newbie

    The triangle is an amplifier. In this case it is a POWER AMPLIFIER. When you connect the "-" input to 0v, any slight voltage on the "+" input is going to make the output change from a LOW to a HIGH. The first few milli volts do not alter the output, but after that it only takes a few more...
  16. C

    SO Im a newbie

    You cannot explain anything without component values. I have absolutely no idea how the circuit works until the values are added.
  17. C

    Diode bridge measurement

    You might have your CRO earthed and not floating.
  18. C

    Regulator for Peltier Element

    You simply turn the module and off with a schmitt trigger arrangement and the thermistor. You will need a fan and heatsink to keep the module cool.
  19. C

    Battery powered device question

    Sorry, you are right. I was put off with his remark: "I applied 3.8 volts and it was fully charged." The only problem is this: Any external battery is just going to constantly charge the internal battery and the charging circuit will consume some of the energy. You are not going to be able...
  20. C

    Battery powered device question

    "but initially, if the device requires 1A " We are not talking about device requirement. We are talking about the ability of one battery charging another battery. Keep to the requirement. "300 mA" means nothing. It is an instantaneous value. We are talking about capacity - mA-Hr.
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