Star Micronics MP111MP-24G-A - Manual (Page 18)

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We employ a zener diode to control spike voltages that occur when the transistor is turned OFF. The following figure
shows and example of the drive circuit. With this circuit, we use a transistor equipped with a zener diode (zener voltage
60 + 10/-5V) between the base and collector.
TR1 2SD2041 (ROHM)
R1 1K
Ω
R2 330
Ω
VH 23V + TR1 for VCE (sat) = 24 V
Fig. 3-11 Example of Print Solenoid Drive Circuit
HV (24 V)