This is purely a voltage drop and you can consider the voltage drop to Sequential timer circuit composed of 556 556 timer dual circuit tester diagram sponsored links circuitdiagram
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PWM Motor Speed Controller Circuit Using IC556
whirlyworld: DC motor control with 556 timer
Sequential timer circuit composed of 556 - Time_Control - Control
This is purely a VOLTAGE DROP and you can consider the voltage drop to
556 PWM - Multisim Live
556 PWM - Multisim Live
556 Dual Timer Tester | Circuit Diagram