Its only about when his AC motor works and taking the cartridge near the disc center that picks a bit of hum. When shutting the motor down, nada. About the Sub triggering on its own, it should be spurious noises picked. Maybe es44 has a point. Would be easy to try those clamp ferrite things we see on computer data cables sometimes.
I tried that too.
I dded big clamping ferrites at input and second at output. Still doing that...
In that case I would need to put the relay between the first stages and R14.
Does the relay coil and needed psu not intrude in the signal ?
If its DC coming from a reg chip like in the Mezmerize there will be no emitted field or other correlation to the contacts so to contaminate the signal lines.
Do you have an oscilloscope so to put it waiting in SINGLE shot mode when sampling the SUB IN RCA? That will capture the event when the SUB randomly turns on. If it is indeed an incoming event and not some erratic hiccup in the B&W sub's stand by circuit.
No occasions of turn On when cable is disconnected from Sub. It is definitely cable, or some signal spike in linkwitz or isolation transformer catching some RF.
I think I'll go to open cable output RCA and I'll insert 0.01uF ceramic between signal and return. It is so tiny space there... What do you think?
I think I'll go to open cable output RCA and I'll insert 0.01uF ceramic between signal and return. It is so tiny space there... What do you think?
The ferrite acts as a Filter to High frequencies IF there is the complementary low impedance at High Frequency to take the RF to Signal Return.
The complementary component required to get the ferrite to work is a capacitor.
The ferrite comes first and the capacitor comes second.
You NEED both components.
The ferrite must be around BOTH the Flow and Return wires of the input PAIR.
The complementary component required to get the ferrite to work is a capacitor.
The ferrite comes first and the capacitor comes second.
You NEED both components.
The ferrite must be around BOTH the Flow and Return wires of the input PAIR.
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I have two scopes, but how to catch such event. I'm not sure if my new Regol has such long recording session capability. Any way, I'll try.... Thank you for your advice.
I see. I'll try to inset cap into RCA and I'll add ferrite.
Not much space for even very small cap and also AB designed DBS is blocking some area for ferrire.
I'll report soon. Thank you.
It has SINGLE button and its also in the trigger menu. Its not long recording, its waiting for something to pass and capture it. Like setting a trap.
See this short video also
https://www.youtube.com/watch?v=g_KuGEh0PyA
This is it what I needed! Thank you very much.
I'll try to capture spikes. Let you know ASAP.
I used a 805 or 604 smd cap across the gap from Hot to Cold on the back of the RCA
This achieves the next to lowest RF impedance.
The lowest impedance would be a group of smd distributed around the whole perimeter of that gap from Hot to Cold.
On that basis using two lower value smd caps would be better than using one smd cap.
Have a look at the newer XLR plugs with the integrated & distributed capacitance from Hot to shell to conduct RF to Chassis.
