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Old 10-15-2019, 11:18 AM   #101
budm
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Default Re: DPS5020 dual power supply build

You are switching AC to the AC load so a NO NO to put diode across the load, you will see nice fire works when that diode conducts. You will put diode across the RELAY DC winding with proper DC polarity to the relay winding.
RC snubber of for the switch contact.
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Last edited by budm; 10-15-2019 at 11:22 AM..
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Old 10-15-2019, 11:21 AM   #102
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Default Re: DPS5020 dual power supply build

Quote:
Originally Posted by budm View Post
You are switching AC to the AC load so a NO NO to put diode across the load, you will see nice fire works when that diode conducts.
Yes, I know that That's why I mentioned DC as a separate topic.
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Old 10-16-2019, 02:21 PM   #103
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Default Re: DPS5020 dual power supply build

To suppress back EMF from an inductive load, an RC snubber is commonly used. A DC inductive load usually has a diode across it to clamp the back EMF.

You can guess a snubbers value based on the transformer's size.
I would use 33-47nF and 22-100 ohms 1-3W as a ballpark for a 1,500VA transformer. The film cap needs to be HV rated, a junkbox X-cap is OK but if the cap fails short, the resistor burns up.

Leakage current from the cap doesn't matter, the transformer might have 1mA flowing all the time but it will stay asleep. Although some loads will still have weak ghost power from that.
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