Intermediate electronics workshop Nathen Strreet http://nathenstreet.com
What’s in your kit 1x 4x 4x 4x 4x 1x 9V
40106 hex Schmitt trigger 10k resistor 10k linear potentiometer 4.7uF capacitor push button switch 3.5mm mono audio input battery clip
1x 2x 8x 8x
custom circuit board teal hookup wire orange hookup wire blue hookup wire
4x 8x 1x 1x 4 x
hexagon risers M2 screws wood base acrylic interface plastic knobs
What is a Schmitt trigger A Schmitt trigger is a type of comparator. Comparators are used in electronics to compare two voltages or currents. Schmitt trigger’s measure the voltages between two thresholds. When the measurement is above or below the threashold, the output is set either high or low (on or off). Some Schmitt triggers, like the 40106 are inverted; that is the output is opposite to the input. Using a potentiometer and a capacitor we put our 40106 into an astable multivibrator mode. This means we take the output of the schmitt trigger and feed it back into itself. This creates a loop in the circuit, causing the output to oscillate on and off. The speed or frequency this occurs is controlled by the potentiometer.
Multivibrators A multivibrator is an electronic circuit used to implement a variety of simple two-state systems such as oscillators, timers and flip-flops. There are three types of multivibrator circuits depending on the circuit operation: astable, in which the circuit is not stable in either state —it
Inverting Schmitt trigger symbol
Non-Inverting Schmitt trigger symbol
continually switches from one state to the other. monostable, in which one of the states is stable, but the other state is unstable (transient). Such a circuit is useful for creating a timing period of fixed duration in response to some external event. bistable, in which the circuit is stable in either state. It can be flipped from one state to the other by an external trigger pulse.