I just got a Pegasus Ultimate Power Box v2.
I'm powering it with a 30amp Astron power supply. A very clean linear power supply.
I'm using the UPBv2 (at the moment) to power, and supply USB, for a QHY camera, and run a single dew heater strap.
One thing I noticed was a lot of audio noise coming from the dew heater strap. (I'm using a DewBuster heater strap which I've had for quite a while.)
My understanding is the powerbox uses pulse modulation on the Dew heater output. It sounds like it is pulsing at something like 1000hz.
I previously used a DewBuster manual dial controller, and it also "pulsed", but the DewBuster ran at like 1 hz... I never heard any sound.
This thing is so noisy I don't think I can use it at a public party.. I find it annoying when I am out with the telescope.
Can I work around this problem?
Will some ferrite chokes help? (I wouldn't think so.)
Does this happen with other Dew Straps?
Btw The Ultimate PB v2 is currently running firmware version 2.4, in case that matters.
thx for any suggestions.