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PLUTO owner support informationNOTICE - The entire web page is strictly confidential - containing proprietary information, which is for PLUTO Construction Plan owners only. If you are not the intended viewer you may not use, disclose, distribute, copy or print this information. | Terms & Conditions | Please understand that I do not have the time to help you individually. Study my website and contact the OPLUG forum if you get stuck. Access to the Resource pages of the
ORION/PLUTO/LX User Group (OPLUG) After you have registered, please forward proof of
purchase to the OPLUG administrator: orionusers@gmail.com.
The admin will then grant you unrestricted access to all site content. ====================================== CAUTION: When deviating from the mechanical construction and pipe diameters make sure that you maintain the specified outside diameter around the woofer and tweeter mountings. Increasing the diameter here will affect diffraction and thus the frequency response and polar response. Beveling the corners to correct for a larger diameter is not sufficiently effective. ====================================== The AnTek transfomer AN-0522 looks like a cost effective
replacement of the specified Amveco product. https://www.antekinc.com/details.php?p=32 I just noticed that due to a file mix-up when I changed computers the 1st track on the Test CD is dual mono pink noise and not pink noise that alternates between left and right channels. The level of the pink noise on track 2 is 6 dB too high. I am sorry if my error has caused confusion. ====================================== Now that you are a PLUTO owner/builder you can request access to the locked areas of the forum. Sign in with your email and a password at https://oplug-support.org/index.php . You will be refused access but you can send an email to the Board Administrator (orionusers@gmail.com) from there and request to be admitted as an owner. ====================================== To view the PLUTO-2.1 supplement to the PLUTO documentation click on the link above. ====================================== A complete update of the Material
List . Thanks to Dave Reite ====================================== For polypropylene capacitor replacement use the Panasonic ECHS-Series of PPS film capacitors with 2% tolerance and 50 (or 100) WV DC rating. (e.g. 33nF = PS1H333G-ND) It appears that the ECSH series will be continued for some time. The increased dissipation factor of 0.3% for PPS compared to 0.1% for PP should have no sonic effect. For polyester film capacitor replacement use the Panasonic E-Series. (e.g. 10uF = E1106-ND) For updates and help also check in with the ORION/PLUTO Users Group ====================================== Material list is updated to replace obsolete Panasonic capacitors. ====================================== I reworked the frequency response in the crossover region and slightly for the tweeter as compared to (40) below. Change C65 from 10nF to 47nF (= 39nF in parallel to
existing 10nF) Pluto-2 has now reference quality for me in the 100 Hz to
10 kHz frequency range. ??? To get an idea of the variability of the AURA tweeter's frequency response see what I measured. ====================================== The VR1 tweeter level adjustment
potentiometer should be centered for circuit tests but it will require listening
tests to arrive at the optimum setting for your particular drivers and room
conditions. See 6.2 of the Construction Plans. See what I measured for the variability of the AURA tweeter's frequency response. ====================================== Material list ====================================== Draft material list. Not checked out for accuracy. ====================================== Panasonic ZNR Transient/Surge Absorber, 85VDC, Digi-Key P7240-ND ======================================
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====================================== The L16 has a continuous circular basket rim. It causes a
diffraction ripple in the frequency response around 4 kHz if the tweeter is set
back 7/8" as in the drawing on page 4. The tweeter should be moved forward
so that the distance is 3/8" inch from the outer edge of the rubber coupler
P to the rubber surround front edge of the tweeter. ====================================== See the added support page for circuit diagram, frequency response and test chart. ====================================== Adding 820 pF to C41, C81 and C91 prevents/reduces some low level spurious oscillation in the MHz range that is visible on the part of the waveform that comes out of clipping. This is a precautionary measure. I am not aware of any audible effects of the oscillation. The amplifier must first be clipping or be near it. ====================================== The inner diameter of the Woofer pipe (K) is 4", the
Tweeter pipe (L, M) is 1.6". (page 5 of Plans) ====================================== 1 - I have found that it is safe to use a 1 A slow-blow fuse instead of the specified 0.5 A fuse, if the amplifier module has been thoroughly tested and is functioning properly. This prevents blowing the fuse during extended high volume level listening. 2 - The heat sinks are marginal in size for extended high volume level listening and the amplifiers can drop out momentarily to cool down before turning back on. This can be prevented by blowing air from a small fan over the heat sinks. Alternatively one could use a single, larger heat sink. Together with the fuse change, Pluto+ is then capable of quite amazing sound levels. 3 - If Pluto+ subwoofers are not used, then the new SEAS midrange driver will provide higher low frequency volume capability than the Peerless driver. ====================================== An alternative midrange driver is the new SEAS L16RN-SL H1480-08. It is optimized for long stroke, low distortion and piston behavior as needed in PLUTO. It is a derivative of the W16NX001 and uses an aluminum cone. The driver can be ordered from Madisound. On the PLUTO pcb the following component changes are required: Change R58 from 10k to 7.5k Implement (25) below or alternatively solder a series connected 2.87k ohm resistor and 2.2 nF capacitor with one end to the junction of R28 and R29 and with its other end to a circuit ground point. This will give the same high frequency boost regardless of which input is used. Re-adjust the tweeter level if necessary with VR1. ====================================== The new DigiKey part number for the 1kohm trimmer potentiometer is 3362P-1-102LF-ND ====================================== The power line fuse for 220 VAC operation should have a 500 mA Slow Blow rating to avoid nuisance blowing due to the inrush current which charges the capacitors. See also (24) below. ====================================== The 12/21/06 subwoofer material list was not completely updated for the equalization change in the U5B stage which requires: R68, R69 = 5.62k The corrected material list is pluto-sub-BOM1.xls The omission had probably little audible consequences. ====================================== The diode bridge with DigiKey part number 1N5401/54GICT-ND has been replaced by 1N5401-E3/54GICT-ND ====================================== A worthwhile improvement in extreme high frequency sound output can be obtained by adding a resistor-capacitor highpass shelving filter. Solder a series connected 1 kohm and 6.8 nF to the junction of R3 and R6 (at R3) and with its other end to ground (at R22). This gives a boost of 2.9 dB at 12 kHz and 4.6 dB at 20 kHz. Note, the added circuitry has no effect when you use the
high level input J2. See (30) above for another way to boost high frequencies. ====================================== The circuit diagram for the power supply of the electronic
module shows the wiring for 110 Vac and with the primary windings of the
transformer in parallel connection. ====================================== Capacitor C69-70 is missing from the material list for the
w-ASP, page 2. ====================================== w-ASP loading of capacitors Make sure that C43-44 = 330nF is loaded into the C43+ and
C44+ holes so that C42 and C43-44 add to 720nF. ====================================== When in doubt about measurements from the Electrical Test Chart on page 26, then check your data against the frequency response curves on page 27. A 1V input at J1 can lead to clipping of some stages, and even a 0.5V input could be too high for TP10, but should be ok otherwise. See (6) below. ====================================== The specified 4-40 flat head screws should be 3/8" long, not 1/2" to work for the stand-offs. Alternatively place a spacer or nut under the screw head. ====================================== Reducing "Hum" In some cases you may hear hum when the PLUTO+ woofer with its power amplifier and crossover is added to an existing PLUTO hook-up. With more components connected to the power line there is increased potential for "ground loops" and hum. Ground loops are closed circuits which provide paths for low level AC ground currents to flow between different ground connections, if these connections are at different ground potentials, or if magnetic stray fields from power transformers induce currents into the loops. If the RCA cables which interconnect the different pieces of equipment are part of the loops, then the ground currents will also flow in the cable shields. Cable shields and associated RCA connector junctions have a finite ohmic resistance so that there is a voltage drop induced across that resistance by the ground current. A "hum" voltage is thereby added to the normal signal voltage.
See also ORION FAQ10. ====================================== R5 is 3.48k and not a Jumper. ====================================== The Peerless 850488 woofer driver has been replaced by the Peerless HDS Nomex 832873 (= 830873). No circuit or construction changes are necessary. It is a drop-in replacement according to my tests. ====================================== For 230 VAC operation the slow-blow fuse rating of F1 must be reduced to 0.250 A. Use a Littelfuse 3AG Glass Body Slo-Blo fuse. Its DigiKey part number is: F310-ND ====================================== The Peerless HDS 850488 driver is still available from Madisound though not listed in their catalog and maybe from other distributors. It has been obsoleted by Peerless. I estimate that I will replace this driver with the Peerless HDS 830873. Initial measurements indicate that it would only require to decrease the tweeter level by about 1 dB (= 2 tick marks ccw). I will eventually take more detailed acoustic response measurements to determine whether a slight adjustment of the equalization is advisable. I assume that it will not be a setback in performance. ====================================== A substitute for the OPA2134 operational amplifier is the OPA2604. You could also use the TL072 until either one of them is available. I would be curious to know if you hear a difference. Either the LM3886T or the LM3886TF can be used for the power operational amplifiers. ====================================== The part number for the 1k resistor R1 should be listed as 1.00kXBK-ND on page 23, and not as 100kXBK-ND. ====================================== In the ====================================== In Europe 110 mm (4") pipe material might be obtained from Georg Fischer Piping Systems if you are an industrial buyer. All pipe sizes in my plans are inner diameters. If you cannot find the exact ID then use the next larger standard size that is available from plumbing material supply stores in your area. the outer diameter is not critical other than to fit matching parts. Sanding off the writing and scratches gives a pleasing matte finish to the pipe surface. ====================================== Here are substitutes for items that may be backordered at Digi-Key - MO Varistor, use BC Components, BC1385-ND ====================================== The positive 15 V regulator, LM78M15CT, has been replaced by the STMicroelectronics L78M15ABV, Digi-Key part 497-1465-5-ND. One PLUTO builder found that the LM78M15CT introduced a 7 kHz low level spurious oscillation, probably due to marginal device parameters. It could be stopped by increasing the value of C107 from 0.33 uF to 4.7 uF. I will investigate this potential problem. If you observe such oscillation, use a 4.7 uF, 50 V tantalum capacitor such as from the AVX TAP Series with Digi-Key part no. 478-1908-ND, $1.28. Observe the polarity. The positive side of C107 is adjacent to the Pos regulator. ====================================== The 0.5A SB fuse with Digi-Key part no. F314-ND has been replaced by part no. F2538-ND ====================================== The 8-pin IC socket Assmann A08-LC-TTA08-LC-TT or
Digi-Key part AE8908-ND is no longer available. ====================================== The "Electrical Test Chart" on page 26 of the
documentation is based on a 1 Vrms input voltage to the PLUTO circuit board. At
this voltage level the 10 kHz tweeter voltage at TP9 will be clipping with
normal AC power line voltage. ====================================== The correct balance of tweeter and woofer outputs is
critical and some experimentation with finding the optimum setting for VR1 may
be necessary due to possible variation in woofer and tweeter sensitivity. ====================================== The preferred TO220 heat sink is part number 294-1086-ND. ====================================== Material list error The correct part number for .01uFcapacitors is P4513-ND. ====================================== New DigiKey part number 220 pF is now P4574-ND If not available use 180 pF, P4573-ND ========================================================================
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