dc blocker test report

[jeapel]

hi

for my aleph 3 oversize toroid buzz with (6sec. turn on
relay with 20 ohm power resistor)

10000uF 10v
RS604 400v 6A
+ MOV Z131-20UL on toroid primary

DC on AC power was very strange to me ?? but
the 6sec. turn on buzz is much lower and the general
buzz sound level is much lower

not perfect but surely a good update for my aleph

bye

 

[jeapel]

i forgot :

my dc blocker is on the hot line wire not the neutral line
like the drawing

 

[jeapel]

any comment with similar testing would be appreciate 🙂

 

[AndrewT]

Hi,
I used the series connected capacitors.
But the downside is they need to be 4 times the capacitance to match the impedance of Bryston's inverse parallel method.

 

[jeapel]

hi Andrew

ok good point for bryston but did you get good
result like me

if i understand your power is 240v (maybe 2 hot wire)
not 120v with hot and neutral wire like canada

 

[AndrewT]

Hi,
I inserted in the hot (live) line just in case it ever went open circuit.
It cut some mechanical hum.

We have one live (230Vac) and one neutral and one earth.
Three phase (400Vac phase to phase and 230Vac phase to neutral) has three live and optional neutral with one earth.