Fan Speed
When testing in a power supply laboratory it is difficult to take fan noise readings as the noise from the Sunmoon test equipment and air conditioning corrupts everything. The next best thing in our circumstances was reading off the fan speed with a tachometer to get an idea for the noise. The ambient temperature during testing held constant at 22 degrees, with 1 degree of variation. Each power supply had a consistent time period of 5 minutes to stabilise between each load scenario.
In my experience the following general relationships apply between noise levels and fan speeds, though it can vary greatly between the type of fan used.
- Below 800 RPM – Inaudible/Silent
- 800 to 1000 RPM – Barely audible
- 1000 – 1200 RPM – Audible but still quiet
- 1200 – 1400 RPM – Moderately noisy
- 1400 – 1800 RPM – Noisy
- 1800 RPM or higher – Intolerable
Teapo are high quality? Things have certainly changed since the days I used them.
When I worked on the bench back in the mid 80’s to late 80’s repairing switching PSU’s was my job and Teapo were a cheap and nasty brand of cap we used to buy use because they were far cheaper than Nippon Chemi-Con and a lot easier to obtain. Generally they were good for about 9 months then they began to swell, leak and pop but those PSU’s were not PC PSU’s but heavy duty PSU’s used in large mainframes, in fact so much current ran through them that they buzzed and it was nerve wracking to to thread a screwdriver past the heatsinks and exposed coils to tweak a potentiometer.
Anyway I’m rambling on now. What I’m getting at is Teapo have been around for a long time and I guess their components have improved considerably because a lot of reputable manufacturers use their caps.