Hard Disk Switch

Posted on Feb 6, 2014

In these times with viruses and other threats from the Internet it would be nice to have reassurance that the PC cannot be infected. That is why this circuit was designed. It makes it possible to install multiple hard disks inside the case of a PC, which are separated in such a way that viruses cannot move from one disk to another. In this case th

Hard Disk Switch
Click here to download the full size of the above Circuit.

ere are three drives installed, one for use of the Internet via ADSL, one for working with email and one for other applications. If data from the Internet never arrives on the third disk, it is effectively protected against viruses. The solution outlined here has been in satisfactory use for a couple of years. There is an additional benefit: if there are ever any problems with the operation of the computer, then it is very easy to change to another hard disk to check if the problem manifests itself there as well. In this case, fault finding can be made much easier. The circuit operates by only switching over the power supply voltages (5 V and 12 V) of the hard disks. The hard disk is out of service without a power supply. This works without a problem with S-ATA disks. With IDE disks this only works with modern drives. There may only be a combination of hard disks on the relevant port and no CD-ROM, DVD-drive, CD-burner or something similar. The selection of the desired hard disk is done with a rotary switch. This has to be set to the correct position before the computer is switched on. When the power supply is turned on, one of three relays is driven via diode D1, D2 or D3. The relays are provided with a hold circuit via a second diode (D4, D5 and D6). In this way the selected relay remains energised as long as the power supply voltage is present. After switching on, electrolytic capacitor C1 is charged via R1, so that the...

Leave Comment

characters left:

Related Circuits

  • New Circuits



    Popular Circuits

    Jfet bipolar cascode video amplifier
    Transistor Clock
    Muscular stimulator circuit
    Design a esthetic and energy-conserving acousto-optic controlled lighting lamp of corridor
    Piezoelectric alarm rings clear as a bell
    Connecting an IR Sensor
    Simple Active Mixer on sinlge voltage
    Circuit diagram of grundig 5441 tv
    Shruthi-1 Sound Filter
    MC1411 series Darlington current internal structure of a drive circuit
    The triangular wave carrier generator circuit diagram
    TDA4863AJ Basic Application Circuit a