Aug 282014
 

I got a 290W solar panel with a shattered glass cover for free.

IMG_20140828_170809

I asked Google about repair methods and found some results where people covered the panel with epoxy. Talked to composite specialists about resin that can be used for that purpose. They recommended a water clear, 2-component epoxy, that is UV stable and will not change color over time while exposed to sun light. A primer additive was also added for usage on glass.

IMG_20140828_170839

Surface is smooth and sealed. The resin got obviously soaked in the glass cracks by capillary effect. With coating the glass seems to be more translucent than is was before.

 

IMG_20140828_170748

Result looking good and ready for experimenting.

Used resin: Link

Primer additive: Link

 

Jul 132014
 

Looks like an awesome FPV plane to build. Definitely a winter time project. Plans are available, see Youtube video description.

Apr 292014
 
MPPT boards

LT3652 Solar MPPT charger board, built, tested and ready to use, configured for >18V input and 12.6V/2A output (charge a 3S LiPo directly from solar panel).

2 pcs available, $25/each, shipping included

Bare PCB for above LT3652 Solar MPPT charger, no components soldered or included.

7 pcs available, $5/each, shipping included

Documentation

When interested leave a comment on this post with your contact email. (Comments will not be published). Only Paypal accepted.

Apr 082014
 

While fiddling with Tor in the last days I was wondering if I can compile the latest source code myself for a Win32 environment. The Tor FAQ gives a hint. Unfortunately the mentioned document is no longer available. It was withdrawn for a revision and a new one is not yet available. Google found a mirror and I took this as a starter. I found the document not complete and useful for the actual source code versions so I wrote an update during my build process (download below). The document is based on the source code versions available in June 2014. The whole build process was performed on a Windows 7 32bit OS running in VirtualBox. Note, the missing Tor specification documents for the package builder are not included in the source code. There is a ticket about this, obviously not yet fixed. The build process was changed for the following thinks:

a) Making of Tor uses the –disable-gcc-hardening flag to  remove the requirement for libssp-0.dll.

b) In openssl the flag -DOPENSSL_NO_RDRAND disables the default Intel RDRAND RNG because it considered insecure.

c) Uses -DOPENSSL_NO_HEARTBEATS to prevent usage of the memory leakage bug discovered on 7th April 2014.

d) Openssl and Tor building with static libraries only, so no extra DLLs are required.

Here is a screen video from the build process: