MEASURES
-
Rails: +/- 24VDC under load
-
DC offset at speaker teminals: +/- 2mV
-
BIAS: 1.3A (0.61V on R13/R14)
-
Voltage gain: 10 (20dB)
-
THD+N (at 1 Watt into 8 Ohms at 1kHz): 0.08%
-
THD (at 1 Watt into 8 Ohms at 1kHz): 0.04%
MEASURES
-
Rails: +/- 24VDC under load
-
DC offset at speaker teminals: +/- 2mV
-
BIAS: 1.3A (0.61V on R13/R14)
-
Voltage gain: 10 (20dB)
-
THD+N (at 1 Watt into 8 Ohms at 1kHz): 0.08%
-
THD (at 1 Watt into 8 Ohms at 1kHz): 0.04%
NOTES
-
R7 changed to 52.3k to remove excess negative DC offset at the output of the amp
-
R4 changed to 8.2 Ohms and 220uF bipolar capacitor added to remove DC offset at Edcor input (pin 1)
-
Boards, Edcor transformers and MOSFETs from TeaBag
-
Harris IRFP9240 MOSFETs
-
Matched Toshiba JFETs from FET Audio
-
Dual mono implementation
-
2 x 250VA transformers from Toroidy - 230V primary, 2x18V secondary
-
8 x 22000uF KEMET PEH200 in power supply
-
Deluxe 4U chassis from Hi-Fi 2000
RESOURCES
-
Manual: First Watt M2
-
diyAudio: Official M2 schematic, M2 Clone boards with 120mm UMS spacing
-
Other: Edcor
Last update: 10.03.2019.
NOTES
-
R7 changed to 52.3k to remove excess negative DC offset at the output of the amp
-
R4 changed to 8.2 Ohms and 220uF bipolar capacitor added to remove DC offset at Edcor input (pin 1)
-
Boards, Edcor transformers and MOSFETs from TeaBag
-
Harris IRFP9240 MOSFETs
-
Matched Toshiba JFETs from FET Audio
-
Dual mono implementation
-
2 x 250VA transformers from Toroidy - 230V primary, 2x18V secondary
-
8 x 22000uF KEMET PEH200 in power supply
-
Deluxe 4U chassis from Hi-Fi 2000
RESOURCES
-
Manual: First Watt M2
-
diyAudio: Official M2 schematic, M2 Clone boards with 120mm UMS spacing
-
Other: Edcor
Last update: 10.03.2019.
Power Supply
DC power supply for Pearl 2 phono stage, Technics SL-1200 turntable and Wyred 4 Sound Music Server in one chassis.
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High current regulator schematic
NOTES
-
Pearl 2 power supply:
-
50VA transformer from Toroidy (230V primary, 2x24V secondary),
-
CRC transformer snubber,
-
CRCRC filter: 4700uF, 10Ohm, 4700uF, 10Ohm, 10000uF.
-
-
Technics SL-1200 power supply:
-
Original transformer removed from the turntable,
-
CRC transformer snubber,
-
CRC filter: 4700uF, 10Ohm, 4700uF.
-
-
Wyred 4 Sound Music Server power supply (10-14V/3A or greater required):
-
Pesante 2U chassis (Hi-Fi 2000)
RESOURCES
-
diyAudio: Technics SL-1200 DC Power Supply, Simple, no-math transformer snubber using Quasimodo test-jig, Building a Pearl 2
-
diyAudio: Juma's Easy-Peasy Capacitance Multiplier, The SLB (Smooth Like Butter) Active Rect/CRC/Cap Mx Class A Power Supply GB
-
Simple circuits reduce regulator noise floor, Using 3-Pin Voltage regulators, Simple high current regulator,
Last update: 06.06.2023.