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  1. C

    Standard method to prevent over discharge of Li-po 3.7V battries

    Do you want just an indicator of the state of charge or an actual FET circuit to remove the battery.
  2. C

    Can someone explain me how a BJT works?

    Not true AT ALL. The voltage Vbe is a mere bi-product of the current entering the base and will vary considerably from one type of transistor to the other. You can NEVER measure Vbe and work out the value of collector current. Ib controls Ic
  3. C

    Bought a cheap soldering iron - should I be concerned about this?

    Simply add a diode in line with the soldering iron and a switch across the diode. This will give you 2 temperatures.
  4. C

    Supercapacitor Track Car Starter

    You have to look at the energy stored in a super capacitor, compared to its weight.
  5. C

    Common collector configuraton

    Common-Collector The COMMON COLLECTOR stage is also called the EMITTER FOLLOWER stage. The input is the base and the output is the emitter. The collector is connected to the supply rail. This stage is classified as having a HIGH INPUT IMPEDANCE because the transistor allows you to deliver a...
  6. C

    Appropriate Oscillator

    Use a 6-pin PIC chip and a FET.
  7. C

    LED strip power supply

    I have 10w to light up 5m of passage and the LEDs are far too bright to look at. LEDs wash out your eyes. They have to be very dull for a staircase. I am just trying to make your installation as simple as possible
  8. C

    LED strip power supply

    You only need 20cm per step. You only need 10 to 15 watts total Use 12v supply and add 100R for each 20cm. Use a 12v 1 amp switch-mode plug pack.
  9. C

    Sound activated alarm

    Buy a dog.
  10. C

    Question about battery in vintage anemometer

    It might be a battery that is no longer made. Like the 4.5v cycle battery. Spade lugs don't fit on a lantern battery.
  11. C

    resistor used as a fuse

    They fit them to pass the "fused appliance" requirement, in some countries.
  12. C

    resistor used as a fuse

    The LEDs are fuses in themselves. The 10R does nothing other than create a problem when it goes open. It will burn out when the electro fails.
  13. C

    Transformer

    You cannot connect an ordinary transformer to a battery. It has to be a battery-charger transformer. I have written all this up on talking electronics website.
  14. C

    How to detect very high frequency sound ?

    Some piezo diaphragms say they will pick up this frequency but you have to test them. I have had no luck.
  15. C

    Connect Different Leds

    Are you sure about 700mA ?????
  16. C

    New board...need drivers

    Programming is a little bit special, you need the DigiSpark version of Arduino IDE (google for it!). When uploading, wait for the IDE to ask you to plug it in! If you plug it in too early programming is not possible! The bootloader simulates USB for the first few seconds after powering it, this...
  17. C

    Temperature control

    The temperature differential between the heater and the bath will be at least 3 degrees. You need an external bath of hot water to maintain the temp if you must keep to less than 1 degree.
  18. C

    Pot for throttle control

    It's $15.00 on eBay
  19. C

    Electronic Equivalent of a 3P6T 'Rotary' 3-Deck Switch

    1 x 555 as a single shot More details required on each output
  20. C

    Newbie needs help with floating signals

    Just add 47k between each pin and 0v rail
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