Activities/Turtle Art/Using Turtle Art Sensors: Difference between revisions

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The XO1 is protected at the input by a 5V zener diode. The allowable input is -0.5V to 5V. Inputs outside this range will cause excessive current and damage. Even a single 1.5V battery can cause damage if connected reverse polarity.

The XO1.5 is protected by a resistor,(1/16W) which should protect up to 9V continuously, and up to higher voltages for shorter periods of time. Similar protection is planned for the XO1.75.

The XO1.5 is protected by a resistor,(1/16W 470 ohm SMD0402) and a pair of diodes to ground and to +3.3V which should protect up to 9V continuously, and up to higher voltages for shorter periods of time. Similar protection is planned for the XO1.75.

For the XO1, the addition of a 150k ohm series resistor would (I expect, no guarantee) give a reduced sensitivity in voltage mode (0-4V) but allow inputs to +- 100V without damage. Input impedance in resistance, volume and pitch modes is much lower but a 1k ohm series resistor should still allow inputs to +-12V.

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<i> 680 ohm series resistor on a 3.5mm audio plug</i>

Test leads with a zener diode and series resistor would expand the safe range for the XO1.5 and XO1.75.

Damage can also be caused by applying voltages between the grounds of any of the external sockets.

==Voltage Mode==

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 The XO1 is protected at the input by a 5V zener diode. The allowable input is -0.5V to 5V. Inputs outside this range will cause excessive current and damage. Even a single 1.5V battery can cause damage if connected reverse polarity.
-The XO1.5 is protected by a resistor,(1/16W) which should protect up to 9V continuously, and up to higher voltages for shorter periods of time. Similar protection is planned for the XO1.75.
+The XO1.5 is protected by a resistor,(1/16W 470 ohm SMD0402) and a pair of diodes to ground and to +3.3V which should protect up to 9V continuously, and up to higher voltages for shorter periods of time. Similar protection is planned for the XO1.75.
 For the XO1, the addition of a 150k ohm series resistor would (I expect, no guarantee) give a reduced sensitivity in voltage mode (0-4V) but allow inputs to +- 100V without damage. Input impedance in resistance, volume and pitch modes is much lower but a 1k ohm series resistor should still allow inputs to +-12V.
@@ Line 22: / Line 22: @@
 <i> 680 ohm series resistor on a 3.5mm audio plug</i>
+Test leads with a zener diode and series resistor would expand the safe range for the XO1.5 and XO1.75.
+Damage can also be caused by applying voltages between the grounds of any of the external sockets.
 ==Voltage Mode==