47 lines
1.8 KiB
Markdown
47 lines
1.8 KiB
Markdown
---
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title: Power Supply
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BOMTable: true
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order: 0
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shortDescription:
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"Create a power supply for your future circuits"
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BOM:
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- type: Capacitor
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count: 2
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value: "10uF"
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- type: Resistor
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count: 2
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value: "10Ω"
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- type: Misc
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label: "2x 9V battery clips"
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- type: Misc
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label: "3 conductive nails for the +V, -V & GND pins"
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Connections:
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- -9v
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- +9v
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- GND
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pcb: "/recipes/power-supply/PaperCircuit.svg"
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---
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This circuit provides -9V[^negative-volt], 0V/Ground and +9V outputs, by combining two 9V batteries. If your project requires it, you can use any kind of battery instead of the 9V one, as long as they're two of the same [^18V].
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You could skip the capacitors and resistors and just connect the batteries together. However, they help filter electrical spikes, making the output smoother [^smooth].
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[^negative-volt]: Some chips, mostly op-amps, require a negative voltage, which does not come out of a battery by default.
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[^18V]: You can also get 18V: treat the -9V pin as 0V, making the 9V pin 18V
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[^smooth]: { height=30px }
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#### Testing
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Before plugging in the battery's, check your connections[^continuity]. When the batteries are plugged in, your pins should read -9V and +9V[^volt-meter].
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[^volt-meter]: Test this by using the volt meter on the multimeter. One probe touches your ground pin, the other the pin you'd like to test.
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[^continuity]: You can test this using the *continuity* mode on your multi meter, which beeps if electricity can pass trough.
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#### Upgrade
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An upgrade that could be useful is adding a power switch and/or LED to show if the power supply is active. |