LEVITON 5 AMP X-10 AC FILTER MODEL # 6287 SCHEMATIC
source:
Nick Ciarallo, newsgroup post
7uH* 7uH*
BLACK ----+---))))))---+---))))))---+---- BLACK
|
|
|
|
| | | | | |
-----|
|-----+-----| |-----
| | | | |
|
0.22uF ----- 0.22uF
-----
| 0.1uF
* 12 turns #18 wire |
on a toroidial core /
0.5" OD
\
"FUSE" (1 strand #18 wire on PCB)
0.25" ID
/
(probably about 1 amp)
0.25" THICK
|
WHITE
Building An efficient Phase coupler and noise blocker
Phase Coupler
The following trivial circuit can is an efficient phase coupler The circuit is a series-connected R-L-C circuit which tunes out the capacitor's reactive impedance. Used for phase coupling, it would be connected across two phases.
I suspect that this $4 circuit is the phase coupler sold commercially for 20 times as much. Alternatively, they can be wired right into the breaker box.
Phase coupling: The components are small enough to be built into a 2 or 3 phase plug. Electric code dictates no circuitry in breaker boxes, so build a plug, if you're a purist.
Bill of materials for each phase couple (three phase systems would need double of this):
- 0.1uF,630v polyester capacitor
- 18uH inductor
- 0.25A inline fuse (optional, but recommended)
- A 2 or 3 phase plug
Procedure:
- Connect a 18uH inductor in series with a 0.1uF,630V capacitor in series with a 0.25A fuse.
- Connect these between phases that need to be coupled in the plug.
Simple theory behind it:
The inductor-capacitor values are such that they resonate at the pass frequency.
The complex impedance of a capacitor is: Z = [1/jwC]. X10 signals are sent at 120KHz. At this frequency, a 0.1uF capacitor would create an impedance of 13.2 ohm, which might hinder obtaining equal signal strength on the two phases. A larger capacitor could be used, but that is more expensive, physically larger, and increases the reactive power load on the circuit from the 2.2 VA with 0.1 uF capacitor.
The series R-L-C circuit complex impedance is given by:
where w = 2(pi)f. The resonating frequency in which the capacitive reactive impedance is canceled is for L = 1/(Cw^2). At this value of L, the circuit impedance is purely resistive with Z = R. The circuit is tuned to resonate at the frequency.
The inductance required to bring a 0.1uF capacitor to resonance at 120 KHz is 17.6 uH. A 18uH inductance is an "off the shelf" value.
The finished signal-bridge therefore consisted of a 0.1uF 630 V capacitor in series with a 18uH inductor - plus a 1/4 amp fuse.
Figure 7 shows a noise block connected in a fixture (Line side). Figure 8 shows a noiseblock connected at module (load side). Black are the live leads, white the neutral lead. In both cases it couples any 120kHz signal generated by the noisy device to ground.
Its simulated response is shown below, and as can be seen, it blocks well around the 120-130KHz:
Installation example by Bruce Robin
Here's a photo of an installation I did using a repeater hooked up through a dryer outlet. I put in a pair of outlets, one per leg, for testing or plugging in a TW523 or CM11a.
