24-05-2020, 07:36 AM
I built a mains DC monitor - quite a simple thing - to check for effective DC on the mains. In my neck of the woods it is less than 40mV, and I have no problem with toroid buzz in 500VA transformers.
But decades ago we lived in St Neots in Cambridgeshire, and well before anyone had started thinking about DC on mains - and I had significant buzz which was time of day dependent.
I knew of Rod Elliott's article and design, but note that a unit that you can either buy a circuit board for, or ready-built is here https://sjostromaudio.net/cart/gb/mains-...rmers.html
Craig
But decades ago we lived in St Neots in Cambridgeshire, and well before anyone had started thinking about DC on mains - and I had significant buzz which was time of day dependent.
I knew of Rod Elliott's article and design, but note that a unit that you can either buy a circuit board for, or ready-built is here https://sjostromaudio.net/cart/gb/mains-...rmers.html
Craig
