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📖 An astable multivibrator circuit consists of two amplifying stages connected in a positive feedback loop by two capacitive-resistive coupling networks. ↪ In this case LEDs have been connected to each stage to provide for flashing effects. ↪ NXP Semiconductors®️ BC817, are used for the NPN transistors in this design. ↪ The simulator options have been loosened so as to better aid in convergence.