Here’s a picture of some statistics from the switching power supply in the last post after running a bit over 24 hours. After 344,268 samples the minimum voltage was 10.160V and the maximum was 10.165V. The average was 10.161V. I had the input voltage set at 12.9V.
I’ve increased the input voltage to 15V and the output is now 10.168V. So far, after over 5000 samples, it has remained a steady 10.168 volts. At 12.9 volts, the output had already swung from 10.160 to 10.165 volts within 100 samples. Currently there is no load on the supply. Switching frequency has decreased as expected and there’s a bit more noise. Putting a 550 ma load decreased the output voltage about 200 mV. I didn’t check the input voltage from the supply at the switching supply’s input.
Looking at the scope, noise on the output decreased dramatically and the input noise increased. Thanks to the noise, the scope can’t return a stable frequency, but no load averaged around 260 KHz and under the 500 ma load, it increased to around 560 KHz.
I forgot to mention that the brand is DROK, and I purchased them off Amazon. The SKU (I think) is 2001708006. I haven’t pulled my spectrum analyzer out yet to check RFI. The bench supply emits quite a bit when the output is active so my current RF test setup is compromised at the moment.
If anything that seems important comes up, I’ll do a new post.
