39,428
edits
7104: Difference between revisions
Jump to navigation
Jump to search
no edit summary
No edit summary |
No edit summary |
||
| Line 63: | Line 63: | ||
Module A25 (schematic page <15>) contains the low-voltage regulators. | Module A25 (schematic page <15>) contains the low-voltage regulators. | ||
There are independently regulated and current-limited sections | There are independently regulated and current-limited sections | ||
for the | for the −50 V, −15 V, +5 V, +15 V and +50 V rails. | ||
Each section has an opamp and a BJT output transistor in emitter-follower configuration. | Each section has an opamp and a BJT output transistor in emitter-follower configuration. | ||
The opamps need power, too. | The opamps need power, too. | ||
To avoid a dependency cycle, the power supplies for the opamps are separate | To avoid a dependency cycle, the power supplies for the opamps are separate | ||
low-current, low-efficiency zener clamps that in no way depend on the | low-current, low-efficiency zener clamps that in no way depend on the −50 V, −15 V, +5 V, +15 V or +50 V regulators. | ||
The power supplies for the opamps produce | The power supplies for the opamps produce −22 V, −5.6 V, +5.6 V, and +22 V. | ||
To avoid exceeding the opamps' limit of 30 V total rail voltage, each opamp either gets | To avoid exceeding the opamps' limit of 30 V total rail voltage, each opamp either gets | ||
−22 V and +5.6 V, or −5.6 V and +22 V, depending on whether it needs more output swing | |||
in the positive or negative direction. | in the positive or negative direction. | ||
The +50 V section is produces the reference voltage for the other sections. | The +50 V section is produces the reference voltage for the other sections. | ||
It uses a | It uses a 9 V zener diode, VR1412, as a reference. | ||
The dependency relationship of the supplies is: | The dependency relationship of the supplies is: | ||
* The | * The −50 V, −15 V, +5, and +15 V sections depend on | ||
** the +50 V supply for reference voltage, | ** the +50 V supply for reference voltage, | ||
** the opamp supplies for to power their opamps, and | ** the opamp supplies for to power their opamps, and | ||
** the A24 semi-regulated rectifier outputs | ** the A24 semi-regulated rectifier outputs | ||
* The +50 V depends on | * The +50 V depends on | ||
** the opamp supplies (+22 V and | ** the opamp supplies (+22 V and −5.6 V) for to power its opamp, | ||
** the A24 semi-regulated rectifier outputs ( | ** the A24 semi-regulated rectifier outputs (−54 and +54 V) | ||
* The opamps supplies depend on | * The opamps supplies depend on | ||
** the A24 semi-regulated rectifier outputs | ** the A24 semi-regulated rectifier outputs | ||
| Line 105: | Line 105: | ||
|align=right| $29,995 | |align=right| $29,995 | ||
|- | |- | ||
! | ! 2019 value | ||
|align=right| $ | |align=right| $44,420 | ||
|align=right| $ | |align=right| $52,310 | ||
|align=right| $ | |align=right| $58,340 | ||
|- | |- | ||
!rowspan=2| Mainframe with [[7A29]],<br />7A29 Opt. 04, [[7B15]], [[7B10]] | !rowspan=2| Mainframe with [[7A29]],<br />7A29 Opt. 04, [[7B15]], [[7B10]] | ||
| Line 116: | Line 116: | ||
|align=right| $44,510 | |align=right| $44,510 | ||
|- | |- | ||
! | ! 2019 value | ||
|align=right| $ | |align=right| $67,040 | ||
|align=right| $ | |align=right| $77,990 | ||
|align=right| $ | |align=right| $86,570 | ||
|- | |- | ||
|} | |} | ||