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M³ Gallery - Page 4
Gilor's M³
This neat M³, built by
Gilor of France,
is a combination of source selector and headphone
amplifier with a bypass function. Three sets of inputs are selectable
via pushbuttons on the front panel, and the is done with relays on a
separate logic board. When the M³'s power is turned off, the
connected sources are available to the speakers amplifier.
Everything is housed in a
Hifi-2000
GX243 enclosure with the optional 10mm thick front panel. The top
is a custom perforated metal cover to provide ample cooling. The
heatsinks have to be trimmed 5mm in order to clear the top cover,
and are attached to the MOSFETs with special clips.
This M³ uses OPA627 opamps, Rubycon, Elna Silmic II,
Wima and Vishay-BC capacitors.
The power supply board was custom designed by Gilor because the STEPS
will not fit in the enclosure. The IEC power entry module includes a
power line filter.
Gilor documented the entire design and build process of this amplifier in
this homecinema-fr.com forum thread.
Gilor1.jpg
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Gilor2.jpg
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Gilor3.jpg
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Gilor4.jpg
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Gilor5.jpg
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Gilor6.jpg
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Gilor7.jpg
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Gilor8.jpg
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M³ by NeilR
This M³ by
NeilR
features two sets of RCA input jacks, selectable by a DPDT toggle switch.
It also has two Neutrik locking headphone jacks for concurrent enjoyment
by two persons. The M³ board features Panasonic ECQP
and Vishay-BC film capacitors, Nichicon PW electrolytic
capacitors, Vishay-Dale RN55 resistors, and Alps RK27 potentiometers.
The opamps are AD8610 (although OPA627/637 have also been tried).
The enclosure is a Hammond 1455T2202BK. NeilR uses an outboard
STEPS power supply for his M³.
NeilR1.jpg
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NeilR2.jpg
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NeilR3.jpg
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NeilR4.jpg
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NeilR5.jpg
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NeilR6.jpg
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NeilR7.jpg
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NeilR8.jpg
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M³ by I-feng Lin
This M³ amplifier and a companion STEPS power supply were built
by I-feng Lin of Taiwan. Both are housed in attractive stainless steel
enclosures. The amplifier also features a modified Linkwitz crossfeed
circuit built on a board from Tangent, and an
AMB ε12 muting/protect circuit.
I-feng used Vishay-Sprague Orange Drop, Wima MKP2 and ERO film capacitors,
Nichicon Muse electrolytic capacitors, Tocos/Tokyo Cosmos potentiometers,
and AD8610 opamps for this M³.
i-feng1.jpg
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i-feng2.jpg
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i-feng3.jpg
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i-feng4.jpg
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i-feng5.jpg
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i-feng6.jpg
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i-feng7.jpg
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i-feng8.jpg
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A balanced M³ by bdb
This balanced M³ amplifier, built by
bdb,
employs two M³ boards (see Other options
for more information).
Each board is powered by a separate STEPS PSU located in a separate case.
The amplifier is housed in a Par-Metal 20 series black anodized aluminum
case, while the power supply lives in a case sourced from Jameco.
Two
ε12
muting/delay circuits are also used to provide headphone protection.
This M³ features OPA627AP opamps, Nichicon Muse KZ electrolytic
capacitors, and two stereo stepped attenuators from
diyfidelity.com.au.
bdb1.jpg
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bdb2.jpg
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bdb3.jpg
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bdb4.jpg
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bdb5.jpg
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bdb6.jpg
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bdb7.jpg
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bdb8.jpg
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Ferrari's M³
This beautiful M³ is built by
Ferrari of the Netherlands.
The enclosure is a
Hifi-2000 GX383 with the optional 10mm thick front panel.
The power supply is a 30V STEPS with Nichicon Muse KZ electrolytics,
housed in a small simple metal case within the main enclosure.
All electrolytics capacitors on the M³ are Rubycon Black Gate,
polystyrene caps for Cbb and C6, and all other bypass caps are MKC.
The volume pot is an Alps RK40 Black Beauty, and the
opamps are OPA627AP/OPA637AP. An
ε12 muting delay circuit
provides protection for the headphones.
Ferrari1.jpg
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Ferrari2.jpg
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Ferrari3.jpg
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Ferrari4.jpg
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Ferrari5.jpg
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Ferrari6.jpg
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Ferrari7.jpg
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Ferrari8.jpg
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M³ by David Wei
David Wei of Taiwan built this M³ using a
hifidiy.net case. The total power supply rail
capacitance is a whopping 28200µF, which necessitated a LM338-based
regulator with soft-start. The regulator is mounted on a large heatsink.
Wima Black Box film capacitors and 3W metal oxide power output resistors
(matched to within 1%) were used.
David originally planned to build this as a headphone/speaker dual
purpose amplifier but was unable to fit speaker binding posts in the
case.
David_Wei1.jpg
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David_Wei2.jpg
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David_Wei3.jpg
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David_Wei4.jpg
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David_Wei5.jpg
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David_Wei6.jpg
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David_Wei7.jpg
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David_Wei8.jpg
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More coming soon!
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