Lunar Oasis: Space Agriculture Era Begins

WASHINGTON, although there is no oxygen in lunar atmosphere,  plants can now grow there. Paragon Space Development Corp has develop a portable green house that can be used to grow plants in space.

The shape of the green house look like a garden light with only 46 centimeters in height. The glass tube is fastened with [...]

Loudspeaker Fuse Placement for Audio Amplifier to Preserve A Good Bass Response

To protect the loud speaker from destructive signal, the most simple way is by placing a fast blown fuse between speaker and the amplifier output. This common solution is depicted in the figure 1 (a).

Figure 1. Fuse Placement to Preserve Good Bass Response
The fuse in the circuit has a significant resistance to generate heat, because [...]

Anti Burglar Alarm, A Half Lie is Much More Dangerous Than 100% Lie

The idea that a half lie is much more dangerous than 100% lie is implemented in this design. Rather than showing off that our car is 100% protected by a sophisticated alarm and protection system, this anti burglar protection circuit prefer to lie that the car is not protected by any electronic alarm or any [...]

Avoid Access Violation Error from OpenDialog (TOpenDialog) / SaveDialog (TSaveDialog)

Whe I use OpenDialog (TOpenDialog), SaveDialog (TSaveDialog), OpenPictureDialog (TOpenPictureDialog), or SavePictureDialog (TSavePictureDialog), on Delphi 7 or Turbo Delphi Explorer running on Windows Xp Sp2, I always get access violation error (run time error) after I open the dialog box for second time. At first time the application run, it’s OK to open and browse the [...]