User talk:Daveb: Difference between revisions
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Dave Brown playing for a while:) | Dave Brown playing for a while:) | ||
==Project | ==Project in slow progress== | ||
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|'''Project''' || '''Status''' || '''Notes''' | |'''Project''' || '''Status''' || '''Notes''' | ||
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|'''Low viscosity blood'''|| thoughts || I have some more reading to do; but am intrigued by http://customers.hbci.com/~wenonah/new/mcdaniel.htm and http://en.wikipedia.org/wiki/Integrated_Pulmonary_Index | |'''Low viscosity blood'''|| thoughts || I have some more reading to do; but am intrigued by http://customers.hbci.com/~wenonah/new/mcdaniel.htm and http://en.wikipedia.org/wiki/Integrated_Pulmonary_Index | ||
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|'''Make solar cell?'''|| idea || Link http://www.freewebs.com/acselectronics/TiO2solar.html | |} | ||
==Project Ideas== | |||
{|border="1" cellpadding="5" cellspacing="0" |'''Make solar cell?'''|| idea || Link http://www.freewebs.com/acselectronics/TiO2solar.html | |||
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|'''Safe by design nuclear'''|| meme || [http://www.youtube.com/watch?v=P9M__yYbsZ4 2 hour promo] | |'''Safe by design nuclear'''|| meme || [http://www.youtube.com/watch?v=P9M__yYbsZ4 2 hour promo] | ||
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|'''tricycle'''|| just a thought || Means of getting around... | |'''tricycle'''|| just a thought || Means of getting around... | ||
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|'''hack caliphers'''|| seen in sparkfun comments || Member #333257 | |||
If you measure current, you will see that the power off state draws 90% of the current of the power on state. For some reason, all electronic calipers seem to be this way- power off is actually display (only) off. THIS is why the batteries go bad quickly. | |||
I just open the caliper case, cut the battery trace (which one doesn’t matter), drill two holes to allow the fine (wire wrap) wire to come out the top to a micro-miniature slide switch glued to the top. I always turn the switch off, rather than press some caliper “off” button, and find that a button cell lasts for many years. I would attach a picture if Sparkfun allowed, but it doesn’t. Caliper thickness is unchanged, and the outline is very nearly unchanged. | |||
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Revision as of 13:50, 25 June 2012
Dave Brown playing for a while:)
Project in slow progress
| Project | Status | Notes |
| Reconfigurable sailing proa | mostly inactive, built small bits | Rob Denny at http://www.harryproa.com has some interesting things to say about Proas and how they could be the basis for a cheap, high performance, spacious sailing cruising boat. Perhaps the ideal cruising boat :). I want to explore the sailing characteristics in a model. |
| LED lights and lenses for my bike | active | http://pilom.com/BicycleElectronics/DynamoCircuits.htm explains the matching of LEDs to bike generators. I plan to have several strings of LEDs with different beam angles and aiming points - and the appropriate string of LEDs turned on for the current bike speed.
Success criteria:
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| Visible surge arrestor | project | I want to know when power surges happen, and if possible stop them cheaply and quickly. Project:Surge Arrestor |
| Low viscosity blood | thoughts | I have some more reading to do; but am intrigued by http://customers.hbci.com/~wenonah/new/mcdaniel.htm and http://en.wikipedia.org/wiki/Integrated_Pulmonary_Index |
Project Ideas
| Safe by design nuclear | meme | 2 hour promo |
| mirrored coils | wild ass; might exist as a Common mode choke | wind two coils on the same core, one left hand the other right hand and link them together. I think they should act as a filter of some sort, because the emf generated by the first travels faster than the electrons and reinforces the current in the other coil, smoothing out the edges of each pulse. The filter frequency being related to the speed of light and electrons in copper and the coil winding length. Maybe there would be less energy lost in the filter? |
| bike trailer | sketches on envelopes | to carry standard building 2.44 x 1.22 M sheets, 2up kayak, etc. Considering
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| tricycle | just a thought | Means of getting around... |
| hack caliphers | seen in sparkfun comments | Member #333257
If you measure current, you will see that the power off state draws 90% of the current of the power on state. For some reason, all electronic calipers seem to be this way- power off is actually display (only) off. THIS is why the batteries go bad quickly. I just open the caliper case, cut the battery trace (which one doesn’t matter), drill two holes to allow the fine (wire wrap) wire to come out the top to a micro-miniature slide switch glued to the top. I always turn the switch off, rather than press some caliper “off” button, and find that a button cell lasts for many years. I would attach a picture if Sparkfun allowed, but it doesn’t. Caliper thickness is unchanged, and the outline is very nearly unchanged. |
Project Status
See Speed Adjustable Bike Light
Parts Shopping
GDT 420v surge arrestor for 240v (if my calculations are right)
wire to board screw connectors 300V 20A
Electrolytic Cap 50v, 2200uF, 8k hours lifetime, 3A ripple current, 23mOhm inductance, ?ESR.
