YaeCCC Auto Transformer AC Variable Voltage Controller Metered

I bought a 16” Lasco window fan. It’s low speed setting is way to high for sleeping so I needed an autotransformer to reduce the line voltage. Variac auto transformers are 10x higher in price (made in USA) so this was a good economic alternative although I would prefer American

The price, quality and performance is very good. Thank You

This gets the job done. Not super high amps or super high voltages but perfect for the times I need to isolate from the mains.

the VU meter matches the dial labeling but nether of those match actual output voltage.the dial is labeled in increments of 13 volts and for every increment +1v or +2v is added to the actual voltage so at 13v dial setting I get 15v, at 26v dial setting I get 30v, etc. at 130v dial setting I get 148v output.output spikes -1.3v at max output (148v) and -0.6v at near min setting (2v) periodically (~2hz, smooth spike). aside from this spike voltage is +/- 0.1v for about 70% of the time, the other 30% being that spike happening.attached is a multi meter test for the dial sweep. dial was turned from min to max to min at a more or less constant rate a few times. voltage spike happens with my unit at around 25v and its significant. you can see it in the picture. the rest of the transition from min voltage to max is smooth. scale of the graph is 0v-160v mean is 80v.also attached is oscilloscope reading of the output at 2v. my scope is only rated for 10v max and im not going to push it with this unit. shows 60hz +/- 0.1hz with a periodic spike in hz every so often which makes it dip to sub 20hz. spike is super short (a few microsecond or less is my guess, didn't bother to try and catch it on the scope to measure it explicitly.) and happens less than once per second so no big deal. you can see that spike measured in the statistics frame on the oscilloscope image under the Min column, average column is still close to 60z so its not a significant spike. if you care about a spike that short you probably care about the waveform too - scope shows a pretty clean saw waveform, not sine wave. this aint guna be lab gear.all in all, for the price, its fine. its not supposed to be lab equipment and as long as you mind the actual output voltage it should work well. im pretty happy with it.UPDATE:been running 24/7 for 11 months, no issues at all.

Solar Off-Grid use.Great transformer for 50% full duty use.

Bought this for my daughter's scientific history project (if it makes sense) and it played its role very well.

Works just fine feels nice and heavy and meter is fairly close

Very happy with this transformer. I returned a previous order for incorrect specs. I am using this unit to regulate the voltage for lichtenberg pyrography.

El indicador de voltaje es muy impreciso, por lo demás excelente