Oscilloscope adaptor: Difference between revisions
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** Using precision surface-mount resistors on a PCB with a heat-sink |
** Using precision surface-mount resistors on a PCB with a heat-sink |
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*** Use body of probe as heatsink, if conductive enough. |
*** Use body of probe as heatsink, if conductive enough. |
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* Use a |
* Use a 2v zener diode with a voltage dependent switch to enable the measuring of voltages less than 2.4v(.3*8) |
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** This method would require the child to recognize high(above 1.9v) and low(below 1.9v) voltages, and to adjust a switch accordingly. |
** This method would require the child to recognize high(above 1.9v) and low(below 1.9v) voltages, and to adjust a switch accordingly. |
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==Prototype== |
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[[Image:Voltage divider.png|||100px|Schematic of a resistor divider. ''R''<sub>1</sub> is connected to ''V''<sub>in</sub> and ''V''<sub>out</sub>, ''R''<sub>2</sub> is connected to ''V''<sub>out</sub> and GND]] |
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* Using a voltage divider like the one imaged above, I set the values of ''R''<sub>1</sub> to be 700 ohms, and ''R''<sub>2</sub> to be 100 ohms, according to the formula: ''V''<sub>out</sub>=''V''<sub>in</sub>*(''R''<sub>2</sub>/(''R''<sub>2</sub>+''R''<sub>1</sub>)) |
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** This gives me a simple voltage divider which divides by a factor of 8 |
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* I then plan on having a simple switch to switch the path of the input from the voltage divider to a 2v Zener diode. |
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[[Category:Hardware ideas]] |
[[Category:Hardware ideas]] |
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[[Category:Hardware]] |
[[Category:Hardware]] |
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Latest revision as of 14:48, 22 September 2007
Goal: To take input from .3-16v to .3-2.0v
Ideas:
Voltage Divider w/ Zener
- Use a resistor-based voltage divider that divides by eight, reducing 16 volts to 2 volts.
- Using precision surface-mount resistors on a PCB with a heat-sink
- Use body of probe as heatsink, if conductive enough.
- Using precision surface-mount resistors on a PCB with a heat-sink
- Use a 2v zener diode with a voltage dependent switch to enable the measuring of voltages less than 2.4v(.3*8)
- This method would require the child to recognize high(above 1.9v) and low(below 1.9v) voltages, and to adjust a switch accordingly.
Prototype
- Using a voltage divider like the one imaged above, I set the values of R1 to be 700 ohms, and R2 to be 100 ohms, according to the formula: Vout=Vin*(R2/(R2+R1))
- This gives me a simple voltage divider which divides by a factor of 8
- I then plan on having a simple switch to switch the path of the input from the voltage divider to a 2v Zener diode.