Hi everyone
New to the DIY stuff, but clearly it seems there is a huge cost advantage to making your own, and using top shelf parts too boot. Learning new things never hurts either! Seeking to build two isolated outlets for two monoblocks, not sure on what all I need to suit. Amps are A/AB, 5 amp max, 100 watts. Solid State. (Monarchy)
What do I need to complete?
Thanks!
New to the DIY stuff, but clearly it seems there is a huge cost advantage to making your own, and using top shelf parts too boot. Learning new things never hurts either! Seeking to build two isolated outlets for two monoblocks, not sure on what all I need to suit. Amps are A/AB, 5 amp max, 100 watts. Solid State. (Monarchy)
What do I need to complete?
Thanks!
I'm no expert - which is why I'm asking the experts.
If the choke works by canceling common mode noise between the hot and neutral,
should the 2 snubber resistors be closely matched ?
For the 1M resistor - does it need to have a special AC rating ?
I'm ordering these Vishay CMF 60 series resistors - rated to 500 v.
https://www.mouser.ca/datasheet/2/427/cmfind-111261.pdf
Also - does anyone know where I can get a flat plastic plate
that can hold 4 or 5 regular AC receptacles - For the back of a 5 x 17" case ?
Thanks
If the choke works by canceling common mode noise between the hot and neutral,
should the 2 snubber resistors be closely matched ?
For the 1M resistor - does it need to have a special AC rating ?
I'm ordering these Vishay CMF 60 series resistors - rated to 500 v.
https://www.mouser.ca/datasheet/2/427/cmfind-111261.pdf
Also - does anyone know where I can get a flat plastic plate
that can hold 4 or 5 regular AC receptacles - For the back of a 5 x 17" case ?
Thanks
Common mode is stopping noise that goes from both hot and neutral to ground. Differential noise is riding on just one or the other.
No the resistors have no reason to be tightly matched. There is no 1M resistor on these. There is a 110k resistor spec'd at 350v.
If you find a plastic plate as you describe, let me know!
No the resistors have no reason to be tightly matched. There is no 1M resistor on these. There is a 110k resistor spec'd at 350v.
If you find a plastic plate as you describe, let me know!
Would you be able to cut a piece of acrylic plastic to fit? That would work
Do you have a link to those products? I would love to find an easy way to house these.
Thanks!
Thanks for your advise.
This polycarbonate (trade name lexan) 4 gang receptacle plate is the closest I can find.
Morris 81441
Industrial Electrical Supply | Morris Products
Polycarbonate can be welded (glued by melting together) using a solvent cement called methylene chloride, but its highly volatile and a carcinogen.
Model air plane cement should work as a solvent cement with polycarbonate
if you want to glue pieces together - but I haven't tested this.
A nylon receptacle plate should be fine as well - they are tough - but can't be glued to another bit of nylon. Those thermoset receptacle plates will crack too easily - as will acrylic.
.
This polycarbonate (trade name lexan) 4 gang receptacle plate is the closest I can find.
Morris 81441
Industrial Electrical Supply | Morris Products
Polycarbonate can be welded (glued by melting together) using a solvent cement called methylene chloride, but its highly volatile and a carcinogen.
Model air plane cement should work as a solvent cement with polycarbonate
if you want to glue pieces together - but I haven't tested this.
A nylon receptacle plate should be fine as well - they are tough - but can't be glued to another bit of nylon. Those thermoset receptacle plates will crack too easily - as will acrylic.
.
Sorry, it's Mcmaster-Carr. Lots of products for building with. McMaster-Carr, click on wall plates, then scroll down near the bottom, picture shows snap together plates.
The one from Morris Supply also looks great.
The one from Morris Supply also looks great.
Destroyer,
Have you simulated putting differential chokes on the hot and neutral
before the Fo Felix ?
Any comments on connecting 2 Fo Felix's in series ?
Also, thanks for your responce about wrapping the ground wire (Hydro Earth)
around a ferrite a few times - as dhsettim asked on #133.
As hydro ground can be quite noisy, I was going to ask this same question.
Also, to point out, its not to code in Ontario to have a separate earth grounding set up
for an audio system, or for any other reason.
In other words, all the grounds in a house can only have one earth node.
.
Have you simulated putting differential chokes on the hot and neutral
before the Fo Felix ?
Any comments on connecting 2 Fo Felix's in series ?
Also, thanks for your responce about wrapping the ground wire (Hydro Earth)
around a ferrite a few times - as dhsettim asked on #133.
As hydro ground can be quite noisy, I was going to ask this same question.
Also, to point out, its not to code in Ontario to have a separate earth grounding set up
for an audio system, or for any other reason.
In other words, all the grounds in a house can only have one earth node.
.
FWIW - I bought one of these units, I may have to make it a bit taller to fit 2 boards in, we'll see. It was inexpensive enough that I thought it was worth a shot.
I'll post some pics when it arrives and I put it all together.
Aluminum HIFI Chassis Case PSU Box DIY US Standard Power Strip 4/6 Outlets | eBay
I'll post some pics when it arrives and I put it all together.
Aluminum HIFI Chassis Case PSU Box DIY US Standard Power Strip 4/6 Outlets | eBay
Well here are some thoughts
It seems the most objectionable noise with audio equipment, on hydro lines,
is spiking noise caused by local motors or switch mode power supplies (computers).
When taking measurements, I use an electric drill, plugged into the same outlet to induce noise.
The drill's trigger is taped, so that its RPM and the spiking noise it creates, is consistent.
Then the noise on the +Ve supply rail of a power supply is measured using a scope.
Looking at the +Ve rail of a power supply, a single Fo Felix significantly reduces spiking noise caused by the drill.
Also, one piece of audio equipment can put noise on a hydro line,
then its picked up by another piece of audio equipment plugged into the same outlet.
For example, I was working on the power supply for a tube preamp.
My power amp has a big old E core humming transformer.
When I switched on the power amp, more spiking noise showed up on the supply rails of the preamp.
The Beauty of the Fo Felix, is that it helps isolate each piece of audio equipment.
I'm not set up for SPICE - however, it seems that its important that parasitics are taken into consideration
if modeling an EMI filter.
The 4 x 0.47uF X2 caps at the front of the Fo Felix , connected between
the hot and neutral, remove differential noise.
Connecting 4 of them in parallel should reduce ESR and ESL.
On the WIMA data sheet of the X2's I have, it says a
" High Degree of interference suppression due to good attenuation and and low ESR. "
Nothing is mentioned about ESL.
.
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