The Apollo 1260 Voltage Regulator is needed when an upgrade is made on a Apollo 1240 from 68040 to 68060 CPU. This is because the 68060 used VCC 3.3V instead of VCC 5V. I based the design around the LM1085 voltage regulator that I find to be very good, but size is a bit bigger than normal. This regulator has been tested successfully with speeds over 80MHz on a 68060 Rev. 6.
Other than that the design is fairly simple and the part that can be a bit tricky is the 0402 SMD capacitor.
BILL OF MATERIAL
|1||LDO Voltage Regulator||TO-263||926-LM1085IS-3.3NOPB||Yes|
|2||Tantal Capacitor 10uF 25VDC||C-Case||T491C106K025AT||Yes|
|1||0.1uF 16V SMD Capacitor||0402||81-GRM155R71C104KA88||Yes|
|1||Female Header||2.54" 2x8 (16pin)||No|
Please note that the Female Header can be replaced with a male header and soldered directly to the PCB. The advantage with this way is that it leaves a less higher footprint.