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bench_power_supply
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new file:   .gitignore
	new file:   NOTES
	new file:   main-board/main-board.kicad_pcb
	new file:   main-board/main-board.kicad_pro
	new file:   main-board/main-board.kicad_sch
	new file:   old_schematics/LCD.pdf
	new file:   old_schematics/layout.pdf
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cinnaboot 2 years ago
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  1. 30
      .gitignore
  2. 34
      NOTES
  3. 2
      main-board/main-board.kicad_pcb
  4. 608
      main-board/main-board.kicad_pro
  5. 11163
      main-board/main-board.kicad_sch
  6. BIN
      old_schematics/LCD.pdf
  7. BIN
      old_schematics/layout.pdf

30
.gitignore vendored
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# For PCBs designed using KiCad: https://www.kicad.org/
# Format documentation: https://kicad.org/help/file-formats/
# Temporary files
*.000
*.bak
*.bck
*.kicad_pcb-bak
*.kicad_sch-bak
*-backups
*.kicad_prl
*.sch-bak
*~
_autosave-*
*.tmp
*-save.pro
*-save.kicad_pcb
fp-info-cache
# Netlist files (exported from Eeschema)
*.net
# Autorouter files (exported from Pcbnew)
*.dsn
*.ses
# Exported BOM files
*.xml
*.csv

34
NOTES
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limits:
output voltage: 2V (minimum of lm723) - 28V (max of lm358)
output current: 3A parallel, 1.5A series (max of transformer)
new features:
- working current limit :P
- calculate actual filtering cap value for some value of ripple at 3A
- I=CdV/dt, C=Idt/dV, dt=8.33ms (one half of 1/60 because full wave),
for 3Vpp ripple at 3A, 3*0.00833/3 = 8,330uF, (2x 50V 4700uF in parallel)
for 1Vpp ripple at 3A, 3*0.00833/1 = 24,990uF :o
- calculate worst case power dissapation value for pass transistor
- at 100C case temp, 3055 can safely dissipate about 60W
15V-2V = 13V*3A = 39W (with relay switching xformer leads at 15V)
should probably still add better heatsink with fan
- use keyed cable connectors
- high side current meausurement resistor
- need to use differential amplifier with good CMRR
- SCR overvoltage protection
- relays:
- on/off switch disables outputs
- switchable output
- voltage range switches transformer configuration
- 2-15V parallel output, 3A
- 15-28V series output, 1.5A
- may need to also switch off output when changing the voltage to
prevent inductive spikes from switching the xformer going to
the output
- kicad:
- virtual symbols for off-board components (ac side protection/switch)
^ https://forum.kicad.info/t/off-board-components-in-kicad-5/22286

2
main-board/main-board.kicad_pcb
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(kicad_pcb (version 20240108) (generator "pcbnew") (generator_version "8.0")
)

608
main-board/main-board.kicad_pro
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11163
main-board/main-board.kicad_sch
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old_schematics/LCD.pdf
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old_schematics/layout.pdf
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