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  1. L

    DIY SSCP7 headlamp and batteries for biking/runing/skiing

    Hi vegarfo, I used these instructions to convert an old atx-power supply: http://www.wikihow.com/Convert-a-Computer-ATX-Power-Supply-to-a-Lab-Power-Supply Info about the bantam balancing charger is readily available on the net. http://www.bantam301.20m.com/BC-5.htm
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    DIY SSCP7 headlamp and batteries for biking/runing/skiing

    I'm happy to report that the lamp has functioned perfectly for nearly a year now. It has taken all kinds of beating from rain and rough mtb-rides. The wide beam works really well on the trails. But as they say: when you get a taste of something good, you tend to want something better. So I'm...
  3. L

    Advice needed - how to build a 50%/100% dimmer simple

    I tested using a T flip-flop with a simulator and with a appropriate capacitor it is possible to tweak the flip-flop so that it toggles its output between hi and lo everytime supply voltage drops down (the clickie function) so that it is possible to choose between 50% and 100% duty-cycle.
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    Advice needed - how to build a 50%/100% dimmer simple

    Yeah. That's the easy way of doing it, but requires the additional switch I don't want to add to my MTE lamp body. I thought of using a 555 time, a T flip-flop and OR gate to accomplish this but I am not sure if it works and this requires quite many components as well.
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    Advice needed - how to build a 50%/100% dimmer simple

    Hi, I have a buck-driver that has a pwm-input. My light has a clickie type switch and I would like to be able add a low mode to my light. Is there a simple way to build a 2-mode dimmer with 50%/100% output? I've looked at the timer 555 circuits which can provide a 50% signal but how do I...
  6. L

    Soldering battery holders?

    I modified one of these holders so that I cut 2/3 of spring away and soldered a piece of soldering wick (braided copper wire) to the positive terminal (without the spring). The negative side with the spring I left unsoldered since I was not able to solder it. The wire rests on top of the spring...
  7. L

    Li-ion / lipo battery pack building and soldering 123

    Ok, then I'm just plain wrong :D. Well, I just reported what happened. Another thing... I've been charging the 2s and 2s3p-packs with 0.5-0.8C (2Amps for 2s and 4Amps for 2s3p). When the charge is complete the battery reads out about 8.35V, so I restart with 0.1-0.3A and the charger completes...
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    Li-ion / lipo battery pack building and soldering 123

    What I wrote was wrong. Of course the external cell voltage is lower at higher currents due to resistance. What I meant was that without knowing the electronics behind the cut-off circuit I am guessing that with lower current the cut-off voltage can be allowed to be lower.
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    Li-ion / lipo battery pack building and soldering 123

    Testing of the larger pack done and everything went as with the smaller 2s-pack. I got kind of worried though because the battery voltage kept falling and falling down to 5.3V before the protection cut in. I thought about this and it seems that the smaller the discharge current is, the lower the...
  10. L

    DIY SSCP7 headlamp and batteries for biking/runing/skiing

    No I haven't glued it permanently, but the piece of heat sink which I added should be touching the lamp body. The lamp body gets to about 63C when the temp limit cuts in so the thermal path is good at least from the led ;). I think that it may help if I had the driver pcb the other way around...
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    DIY SSCP7 headlamp and batteries for biking/runing/skiing

    Update: As I am pretty happy with the design, I am still having a problem with heatsinking / overheating of the light. I did add an additional heatsink to the diode and transistor (pics above) , but the d2flex temperature cut-off at 90C still turns the light to lower mode after 5 minutes, even...
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    Regulated Headlights - Health Impact ( EMF )

    I did some measurements, not very scientific but still... to get some idea. I used an Agilent 2GSps oscilloscope with 2 different wire lengths (20cm and 80cm) at a 1MOhm input. High impedance input is likely to catch any electric fields going around. First, a regular 60W incandecent lamp...
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    Regulated Headlights - Health Impact ( EMF )

    Actually, I did not assume this and I'm sorry if you got the impression that I did so. But I agree on the fact that damage can occur in other ways also - like ionizing with x-rays. Having a closed metal case (faradays cage) around the device to shield off radiation is still a good idea. I...
  14. L

    Regulated Headlights - Health Impact ( EMF )

    I know, I was trying give perspective of powers and frequencies.
  15. L

    Regulated Headlights - Health Impact ( EMF )

    I'm a RF engineer so I think I know what I am talking about. And while I understand the concern of the people here, I'm afraid I have to agree with r-s about the dangers of low frequency EMR. (Though not his flaming) Take for example microwave ovens. They operate at around 2.4GHz and use...
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