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Old Dec 08, 2012, 09:07 AM
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Canada, MB, Winnipeg
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Cny17f

The CNY17Fcomes in 4 versions, CNY17F-1, CNY17F-2, CNY17F-3, and CNY17F-4. The CNY17F-1 has the same specs as the 4N25, you could also use the -2 but, the -3 and -4 have a transfer ratio of over 100% and can be over sensitive. Also, almost all manufacturers recommend that the RL, R11 in Gompy's schematic be between 75 and 100 ohms. The higher the resistance the slower the transistor in the opto switches. Also Vishay shows using a 50 ohm LED resistor with a 5v supply, I believe these values will solve the switching problems.

Ray
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