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21
Messages from ADMIN / Images deletion
« Last post by CG on May 12, 2021, 08:03:04 am »
Had to prune images to keep the forum free.
https://www.dropbox.com/s/0d9975ge857vm1r/1620820584612.jpg?dl=0
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Thermal / Re: New/ Old solution for energy storage
« Last post by CG on May 08, 2021, 09:07:09 am »
Two storage methods that don't have that problem are pumped hydro and lifted weights.
They could make one to raise a building at night , then lower the building during times when the power is needed. Probably would only need to raise it a few feet.
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Thermal / Re: New/ Old solution for energy storage
« Last post by Caleb on May 08, 2021, 08:56:58 am »
I wonder if they will run into problems like we have with capacitors; they are great when fully charged, but the energy stored drops off quickly as they discharge.  I mean, as the warm rocks get cooler and the cold rocks get warmer, there is less temperature difference to run the heat engines so the efficiency drops (rapidly?).  But I'm sure they have modeled all that.  Just a thought.
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Solar energy / Solar VAWT
« Last post by CG on May 02, 2021, 12:34:59 pm »
VAWT with flexible solar panels as blades.

https://youtu.be/z3GncFhWinI
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Misc. / Re: Light weight bass guitar amp
« Last post by CG on May 01, 2021, 06:29:20 am »
Sounds great !
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Misc. / Re: Light weight bass guitar amp
« Last post by Caleb on April 30, 2021, 05:15:38 pm »
I think I'm going to call this project done for now.  I got the electronics in a box and it seems to work okay.

https://www.bitchute.com/video/Kw1J9um5dSUJ/
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Misc. / Re: Light weight bass guitar amp
« Last post by Caleb on April 20, 2021, 07:50:11 pm »
You could be right.  But the web site said that you could get lower frequency response with higher mass and larger panels.  I had made some speakers with 1/8" (3mm) ply before with decent results so I just made the panels larger.  Dayton Audio showed diagrams with as many as four exciters on a panel, so I didn't think two would be too out there.  It let me put one 4 ohm speaker on each channel of a stereo amp for a little more power out of a 12 volt supply.  I've got some parts on order and hopefully I can finish it up soon and see what it can do.
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Misc. / Re: Light weight bass guitar amp
« Last post by CG on April 20, 2021, 06:55:10 pm »
Nice wood working.
Couple suggestions.
I'm pretty sure that foam board would give better bass response, it has less mass plus its more compliant.
Also mounting two exciters on the same panel probably would set up interference waves and cancel out some of the sound, kind of like throwing two stones in a pond.
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