Hey, Jim... I had no idea how to spec the snubber, so I chose whatever was in stock and affordable. If the MOVs absorb the turn-off kick, that's great. This kit is designed to run continuously so powerdown should only happen once every two weeks or so.
I've put a 13 A fuse in series with the...
I bought the following three varistors (130 VAC, 150VAC, 175 VAC):
http://my.element14.com/epcos/b72220s0131k101/varistor-74-0j-130vac/dp/1004282
http://my.element14.com/epcos/b72220s0171k101/varistor-98-0j-175vac/dp/1004352...
Good point... it's normally about 243 V on each phase.
We did have a scary situation last month. During a storm, 30 second long surges came about once every 2 minutes for half an hour... lots of long lasting surges. My multimeter said 290 V, but the lights were flickering (brightly!) so I don't...
I've done some quick calculations and it seems an RC snubber can generate quite a bit of heat. A 0.5 uF capacitor would limit 110 V @ 50 Hz to about 17 mA. This would make 1.7 W of heat in a 100 Ohm resistor. But the units come as a whole and they're specced for up to 600 VAC, so I guess heat...
Hi anorlunda. I'd prefer a DIY option since it'll be a lot cheaper, and surge protectors are designed to protect against infrequent surges, not regular inductive kicks. Good call with pennies but I think that shouldn't be necessary for the 110 V side since the transformer is isolating and the...
Hi berkeman,
I can't get 110 V power strips where I live... we only have 240 V kit here. Also, from reading reviews, surge protection in power strips seems a bit hit and miss. Some are good, some fail silently and leave you without protection. There's also the issues that one bit of equipment...
Hey... how's it going?
I've built a step down box to run 110 VAC appliances off incoming 240 VAC (Malaysia). The only components in the box are a cooling fan (240 V) and a great big transformer. It's a single phase 30A output aluminium cored 240V->110V 50 Hz transformer that weighs about 25 kg...
Hey... how it's going?
I signed up because I have a quick question about a snubber for a step down transformer.
I've already posted it on eeweb.com ... am I allowed to repost it here also? Extra info is certainly appreciated :)
Thanks,
- Leo