I am new in electronics and this is old subject but still. I started new Arduino project where I control 4 solenoid valves independently via Arduino 4 chanel 5 V Relay module. From the beginning I put flyback diode on each solenoid to eliminate EMF (1N4002). Everything works fine but when I speed up cycle things get messy (I need speed about 30 Hz). Solenoid coil can't discharge properly that quickly (it has delay). I read some forums and found solution: diode+zener.
What kind of zener diode should I use and how to properly mount it (any additional parts)?
I am also afraid of over-heating due to quite high current. How can I avoid it?
My valves are: 48 VAC, 3.8 VA and 24 VDC, 3.1 W.
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