Quote:
Originally Posted by IvanTheTerrible
I use a PWM kit from Jaycar Electronics ...
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Problem is with the the jaycar cct & RCA connectors, 12V DC can be present on the outer shield of the RCA connectors (if the shell is metal)...see below. I knew this was a problem but really only did anything when I purchase some kendrick dew heater straps which had metal RCA plugs.
The Jaycar cct was not really designed for RCA type connectors more designed for something that is hardwired.
There are many Dew PWM ccts out there that switch Vcc & allow +12V on the RCA shield. In reality RCA plug connectors for this use are a poor choice adopted by amaturer astro nuts.
Some RCA plugs have plastic shells but usually even these have a metal skirt that can present the same problem, especially if you use an extender RCA cable wrapped around your tube.
An easy fix is to cover the RCA conectors with insulating heatshrink.
You will probably never have an issue but it would be very easy to short one of these RCA plugs to your mount or scope...passing +12V thru it.
Which would do wonders for all your valuable electronic equipment.
edit:
Oh damn....I forgot...and "Welcome Ivan"