Editing Basic Circuit Building Blocks
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*[http://chungyan5.no-ip.org/vc/trunk/AltiumDesigner6ProjectFiles.zip?root=7segment_LEDs&view=log AltiumDesigner6ProjectFiles] | *[http://chungyan5.no-ip.org/vc/trunk/AltiumDesigner6ProjectFiles.zip?root=7segment_LEDs&view=log AltiumDesigner6ProjectFiles] | ||
*[http://www.dnatechindia.com/index.php/Tutorials/8051-Tutorial/7-Seg-Interfacing.html Interfacing Seven Segment to Microcontroller] | *[http://www.dnatechindia.com/index.php/Tutorials/8051-Tutorial/7-Seg-Interfacing.html Interfacing Seven Segment to Microcontroller] | ||
− | + | == Schmitt Trigger == | |
+ | Use this circuit when you want to sense if an input is either high or low. The circuit elmininate inputs that are "in between" and stops small noise signals from causing the input to rapidly oscillate from high to low. | ||
+ | |||
+ | |||
+ | Circuit: | ||
+ | [[Image:opamp_st.png | Schmitt Trigger ]] | ||
+ | |||
+ | Where | ||
+ | *RIN input resistor -- when this inputs more current than the positive feedback resistor the output switches to the voltage at the input, else it stays at the output voltage it has already reached. Typically lower in value than RFB. | ||
+ | *RFB positive feedback resistor the output voltage is feed back to the input and keeps the output at its current voltage. | ||
+ | |||
+ | |||
+ | Discussion: | ||
+ | |||
+ | The circuit is used to switch between two states even in the presence of noise. This is an somewhat unusual op amp circuit as it uses positive not negative feedback. See the references for a better explanation and variations on the circuit. | ||
+ | Schmidt Triggers are also available as integrated circuits which require no external components. | ||
+ | |||
+ | More Information: | ||
+ | *[[OpAmp Links]] | ||
== Oscillators == | == Oscillators == |