Fig. 7: Example comparator POMaC circuit.
From: Biodegradable elastomeric circuit boards from citric acid-based polyesters
a POMaC circuit boards can be designed with multiple component attachment locations. b Fully functional POMaC circuit board implementing a comparator circuit. The LED is not illuminated when the applied sinusoidal input signal (+0.75 V magnitude, +0.75 V offset) is less than the applied threshold signal (+0.75 V), due to an amplifier output of 0 V. c When the input signal surpasses the threshold signal, the amplifier output increases and the LED is illuminated. d Voltage monitoring of the circuit in operation with various frequencies of input signal (0.1, 0.25, and 0.5 Hz). For each frequency, the black circle represents the time at which the amplifier receives power. Once the amplifier is powered and the threshold voltage is surpassed, the LED is forward-biased by the positive amplifier output voltage. Note that total LED illumination time for each cycle decreases as the frequency of input signal is increased (due to a shorter cycle period). Scale Bar = 26 mm.
