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Application Note #1435 Protecting Encoder Input Circuitry If there are voltage spikes which are damaging the line receiver inputs of the Galil controller, the input circuit may be protected by placing 2 diodes on every encoder input that is used on the controller (CHA, CHB, CHA-, CHB-). The procedure and diagram for this modification are as follows. 1. Place one diode with the anode connected to the encoder signal and the cathode connected to + 12V. 2. Place the second diode with the cathode connected to the encoder signal and the anode connected to -12V. A resistor, such as 100 Ohms, should also be inserted into each line prior to the diodes. Generic electronics diode (such as 1n914 or 1n4148) should be sufficient. The diodes will clamp the input and the 100 Ohm resistor should limit the current into the diodes to keep them from being damaged. +12V From Encoder To Controller 100 Diodes are 1N914 or 1N4148 -12V -1Galil Motion Control, Inc. • 3750 Atherton Road • Rocklin, CA 95765 USA • 800-377-6329 • Ph: 916-626-0101 • Fax: 916-626-0102 • www.galilmc.com