Comments on: 11/16/2012 – Do You Even Lift? http://yehudamoon.com/11162012/ Wed, 22 May 2013 13:53:10 +0000 hourly 1 http://wordpress.org/?v=3.4.1 By: Mike Schwab http://yehudamoon.com/11162012/#comment-57817 Mike Schwab Mon, 19 Nov 2012 18:02:36 +0000 http://yehudamoon.com/?p=3702#comment-57817 Not even bother with a http://en.wikipedia.org/wiki/Rectifier so you can charge a capacitor for a short standby light ? Not even bother with a http://en.wikipedia.org/wiki/Rectifier so you can charge a capacitor for a short standby light
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]]> By: spiny norman http://yehudamoon.com/11162012/#comment-57806 spiny norman Mon, 19 Nov 2012 15:18:22 +0000 http://yehudamoon.com/?p=3702#comment-57806 transportation cyclists have no sense of humor anyway. transportation cyclists have no sense of humor anyway.

]]> By: Tencon http://yehudamoon.com/11162012/#comment-57787 Tencon Mon, 19 Nov 2012 01:50:54 +0000 http://yehudamoon.com/?p=3702#comment-57787 As for the AC reading - a power specialist would have a better idea but transformers are weird :-) :-) :-) :-) Some types of meter are 'pumped' by the ac from the tx which gives the effect you describe - try doing the reading with a small light bulb across the wires - can be a low-wattage mains type. It would be interesting to hear the results. (I cannot remember why this happens as that memory has not come back to me yet :-( ) As for the AC reading – a power specialist would have a better idea but transformers are weird :-) :-) :-) :-)
Some types of meter are ‘pumped’ by the ac from the tx which gives the effect you describe – try doing the reading with a small light bulb across the wires – can be a low-wattage mains type. It would be interesting to hear the results. (I cannot remember why this happens as that memory has not come back to me yet :-( )

]]> By: Tencon http://yehudamoon.com/11162012/#comment-57786 Tencon Mon, 19 Nov 2012 01:46:08 +0000 http://yehudamoon.com/?p=3702#comment-57786 As far as I have been able to determine so far - you get what you pay for! :-) 1. 'Cheap' - Transformer (tx) - Rectifier - Capacitor - (fuse?) - SMB plug. 2. Professional unit (Expensive) - The above suppies the regulator I mentioned above which has more capacitors around it before the plug. 3. Custom - VERY expensive - Switched mode PSU (too complex to describe. What I spent a lot of my life maintaining!) I guess the ones you describe fit in 1 above. No need for more unless you get hum... In bad cases of hum, you may need No 3. Usually hum is caused by inefficient earthing/screening of some item... As far as I have been able to determine so far – you get what you pay for! :-)
1. ‘Cheap’ – Transformer (tx) – Rectifier – Capacitor – (fuse?) – SMB plug.
2. Professional unit (Expensive) – The above suppies the regulator I mentioned above which has more capacitors around it before the plug.
3. Custom – VERY expensive – Switched mode PSU (too complex to describe. What I spent a lot of my life maintaining!)
I guess the ones you describe fit in 1 above. No need for more unless you get hum… In bad cases of hum, you may need No 3. Usually hum is caused by inefficient earthing/screening of some item…

]]> By: troiker http://yehudamoon.com/11162012/#comment-57785 troiker Sun, 18 Nov 2012 16:23:44 +0000 http://yehudamoon.com/?p=3702#comment-57785 @ Tencon - I have some transformers for effects boxes and a digital recorder which specify the output voltage as 9v DC - but my meter reads their outputs as 12.5V - exactly the 1.4 factor you mention. The devices run fine despite apparently being run at too high a voltage. Interestingly, if I set the meter to record AC voltage, the transformers seem to be running at 27V. Can't begin to imagine what's happening there! @ Tencon – I have some transformers for effects boxes and a digital recorder which specify the output voltage as 9v DC – but my meter reads their outputs as 12.5V – exactly the 1.4 factor you mention. The devices run fine despite apparently being run at too high a voltage. Interestingly, if I set the meter to record AC voltage, the transformers seem to be running at 27V. Can’t begin to imagine what’s happening there!

]]> By: Tencon http://yehudamoon.com/11162012/#comment-57784 Tencon Sun, 18 Nov 2012 11:48:37 +0000 http://yehudamoon.com/?p=3702#comment-57784 It's only high drag if you have the brake on Sidewalker! ;-) It’s only high drag if you have the brake on Sidewalker! ;-)

]]> By: Tencon http://yehudamoon.com/11162012/#comment-57783 Tencon Sun, 18 Nov 2012 10:13:38 +0000 http://yehudamoon.com/?p=3702#comment-57783 I must add that THAT controller is a 5V one. Put an ordinary diode between the earth tag and earth for every 0.6V higher you want out. I must add that THAT controller is a 5V one. Put an ordinary diode between the earth tag and earth for every 0.6V higher you want out.

]]> By: Tencon http://yehudamoon.com/11162012/#comment-57782 Tencon Sun, 18 Nov 2012 10:10:23 +0000 http://yehudamoon.com/?p=3702#comment-57782 Well said Zorba - Like :-) btw - @Pops - I am from planet Earth, like you. I was trained in Electronics for my work from the 1960s... Sorry, but the system seemed simple to me. :-) Twin wires from the generator put out alternating current, voltage depends on speed but designed to be about 6V at normal riding speeds (commuter!) Ok so then speed freaks go faster and the voltage goes higher - the bulb eventually burns out. Put a higher wattage bulb in and the load will limit the voltage for a while but if you go fast enough, the filament will fail. A Zener diode is like normal diode - it passes electricity in one direction only. When the designed Zener voltage is reached, it becomes a sort of short-circuit. So any voltage above the Zener setting gets turned into heat. The device I listed above will take the input voltage and control it, giving out a steady voltage. Note that a full wave rectifier will multiply the voltage by 1.4! (There is a version that DIVIDES it by 1.4 instead but needs three wires...) So I guess that some bulb failures are due to a rectifier being used turning the 6V into 8.4 Volts? 6.2V becomes 8.6V etc. Well said Zorba – Like :-)

btw – @Pops – I am from planet Earth, like you. I was trained in Electronics for my work from the 1960s… Sorry, but the system seemed simple to me. :-)

Twin wires from the generator put out alternating current, voltage depends on speed but designed to be about 6V at normal riding speeds (commuter!)
Ok so then speed freaks go faster and the voltage goes higher – the bulb eventually burns out. Put a higher wattage bulb in and the load will limit the voltage for a while but if you go fast enough, the filament will fail.
A Zener diode is like normal diode – it passes electricity in one direction only. When the designed Zener voltage is reached, it becomes a sort of short-circuit. So any voltage above the Zener setting gets turned into heat.
The device I listed above will take the input voltage and control it, giving out a steady voltage.
Note that a full wave rectifier will multiply the voltage by 1.4! (There is a version that DIVIDES it by 1.4 instead but needs three wires…)
So I guess that some bulb failures are due to a rectifier being used turning the 6V into 8.4 Volts? 6.2V becomes 8.6V etc.

]]> By: Zorba http://yehudamoon.com/11162012/#comment-57780 Zorba Sun, 18 Nov 2012 01:27:33 +0000 http://yehudamoon.com/?p=3702#comment-57780 Why does EVERYTHING have to be a "sport" or competition of some kind? Why does EVERYTHING have to be a “sport” or competition of some kind?

]]> By: yolanda http://yehudamoon.com/11162012/#comment-57779 yolanda Sat, 17 Nov 2012 16:51:29 +0000 http://yehudamoon.com/?p=3702#comment-57779 generator tech has improved and if you're willing to spend your cash you can get generators you barely notice which produce light you do notice, unlike the old generators. My winter bike has a nifty setup with two little lights on each hub sticking out and a magnet in the spokes that makes the light blink when it passes. It's not much, but enough for visibility when I'm in traffic at night. generator tech has improved and if you’re willing to spend your cash you can get generators you barely notice which produce light you do notice, unlike the old generators. My winter bike has a nifty setup with two little lights on each hub sticking out and a magnet in the spokes that makes the light blink when it passes. It’s not much, but enough for visibility when I’m in traffic at night.

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