Spectrum polish off: Difference between revisions

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Fixes done until now:<br />
Fixes done until now:<br />


Replaced blown up 7805 voltage regulator.<br />
* Replaced blown up 7805 voltage regulator.<br />
Repaired +12V & -5V generator (replaced two transistors).<br />
* Repaired the +12V & -5V generator (replaced two transistors).<br />
Completely replaced foil keyboard by 40 6x6mm buttons, hot glued to the inside and hard wired, the rubber keypad was modified to make place for the buttons.<br />
* Completely replaced foil keyboard by 40 6x6mm buttons, hot glued to the inside and hard wired, the rubber keypad was modified to make place for the buttons.<br />
Built in a 1 transistor preamp to make the cassette input sensitive enough so it accepts signals from a tablet or laptop.<br /><br />
* Built in a 1 transistor preamp to make the cassette input sensitive enough so it accepts signals from a tablet or laptop.<br /><br />
TODO:<br />
TODO:<br />
Add a built in joystick, (port) that works by activating certain keys, by using FET's connected between the keyboard matrix points for the keys, 5,6,7 & 8, and 0 for fire.
Add a built in joystick, (port) that works by activating certain keys, by using FET's connected between the keyboard matrix points for the keys, 5,6,7 & 8, and 0 for fire.

Revision as of 17:14, 16 April 2014

Project Spectrum fixup
Status In progress
Contact mahjongg
Last Update 2014-04-16


Sinclair Spectrum fixup is a project to restore a donated defective Sinclair spectrum to working order:

Fixes done until now:

  • Replaced blown up 7805 voltage regulator.
  • Repaired the +12V & -5V generator (replaced two transistors).
  • Completely replaced foil keyboard by 40 6x6mm buttons, hot glued to the inside and hard wired, the rubber keypad was modified to make place for the buttons.
  • Built in a 1 transistor preamp to make the cassette input sensitive enough so it accepts signals from a tablet or laptop.

TODO:
Add a built in joystick, (port) that works by activating certain keys, by using FET's connected between the keyboard matrix points for the keys, 5,6,7 & 8, and 0 for fire.