Fig. 4. Circuit diagram of the heater module. F2 : Polymeric Positive Temperature Coefficient (PPTC), Q1 : Heater (Bipolar Transistors), Q2 : N-Channel Metal Oxide Semiconductor Field Effect Transistor (MOSFET), R1, R2 and R8 : Resister.

Korean J Acupunct 2021;38:282-9 https://doi.org/10.14406/acu.2021.029

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