User talk:Daveb

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: generate some light at low speed generate more light at high speed get it too work don't break the bank
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
bike trailer	sketches on envelopes	to carry standard building 2.44 x 1.22 M sheets, 2up kayak, etc. Considering extending the bike rack so the trailer can be carried inverted over the rack; wheel mounts that can be pivoted to vary the trailers wheelbase narrow for storage on bike wider for normal use extra wide to control the windage of a building sheet
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.

Dumb Ideas

mirrored coils

reinventing the wheel; already exists 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? I need to learn some maths so I can understand the wiki explanation.

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.