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2014-11-17 22:06  
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In this circuit, Q1 through Q4 are triggered in diagonal pairs. The pair to be turned on is controlled by S1, which selects either T1 or T2 to receive a pulse from Q5. Current in the motor field is reversed by selecting either Q2 and Q3, or Q1 and Q4, for conduction. Because motor armature current is always in the same direction, the field current reverses in relation to the armature current, which thus reverses the direction of motor rotation. The setting of R1 determines the conduction angle of either Q1 through Q4 or Q2/Q3, thus setting the average motor voltage and thereby the speed.