January 4th, 2021, 15:59
The heads are so sensitive to static discharge that they contain a built in fuse to short the terminals. Once the heads are mounted on the arms , and the arms have been mated with the control chip a special command is sent to the read/write chip to blow the fuses. A verification process makes sure all electrical connections are ok and then the fuses are blown.
January 4th, 2021, 18:28
January 5th, 2021, 13:17
January 6th, 2021, 6:46
January 6th, 2021, 14:14
January 6th, 2021, 16:11
January 6th, 2021, 16:25
guru wrote:From the above he must be talking about “Trimming” (blowing fuses) is used to compensate for process variations- Trimming uses fuse circuitry to address the variations.
free_electron wrote:i make the chips that sit on the drives :)
I did the preamps ( the read/write amplifier that sits on the arm with the heads ) for about 2 years.
January 6th, 2021, 17:03
January 6th, 2021, 17:44
January 6th, 2021, 18:31
January 6th, 2021, 18:48
In another embodiment, the transducing head includes a shunt electrically connected with the sensor element in parallel. The shunt includes a plurality of removable resistive elements, each resistive element having an element resistance, and an adjustable transducing head resistance defined by the sensor resistance and the element resistances. Sequential removal of some or all of the resistive elements establishes a desired transducing head resistance.
Powered by phpBB © phpBB Group.