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ReferenceDescriptionManufacturerManufacturer Part#Mouser#Digikey# (Alternative)QuantityComment
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C1, C2100n 10% X7R 50V 5.0mm lead spacingVishayK104K15X7RF5TH5594-K104K15X7RF5TH5 BC1101CT-ND2
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C3, C468u 20% Elec. 35V 2.5mm lead spacingPanasonicEEU-FM1V680667-EEU-FM1V680P12926-ND2
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C5220u 20% Elec. 63V 5.0mm lead spacingPanasonicEEU-FC1J221S667-EEU-FC1J221SP10347-ND1
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C6, CB1680u 20% Elec. 35V 5.0mm lead spacingPanasonicEEU-FM1V681667-EEU-FM1V681P12417-ND2
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CB210n 5% Film 400V 5.0mm lead spacingWimaMKP2G021001C00JSSD505-MKP20.01/400/5399-6025-ND1Digikey part is not an exact replacement (Kemet vs Wima).
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CF47p 5% Film 1000V 5.0mm lead spacingWimaFKP2O100471D00JSSD505-FKP247/1000/5490-7471-1-ND1Digikey part is not exact replacement (Ceramic vs Film).
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CZ220p 2.5% Film 100V 5.0mm lead spacingWimaFKP2D002201D00HSSD505-FKP2220/100/2.5399-7683-ND1Digikey part is not exact replacement (Kemet vs Wima). Value is suitable for the EA2622 transformer.
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R1, R26.81K 1% 0.25W metal film resistorXicon271-6.81K-RC271-6.81K-RC6.81KXBK-ND10Match a pair as close as possible with a multimeter.
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R3, R9, R14470Ω 1% 0.25W metal film resistorXicon271-470-RC271-470-RC470ADCT-ND3Adjust these resistors to tweak the LEDs brightness.
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R4100Ω 1% 0.25W metal film resistorXicon271-100-RC271-100-RC100ADCT-ND1
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R51.69K 1% 0.25W metal film resistorXicon271-1.69K-RC271-1.69K-RC1.69KXBK-ND1
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R6, R12150Ω 1% 0.25W metal film resistorXicon271-150-RC271-150-RC150ADCT-ND2
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R7, R8681Ω 1% 0.25W metal film resistorXicon271-681-RC271-681-RC681XTR-ND10Match a pair as close as possible with a multimeter.
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R1010K 1% 0.25W metal film resistorXicon271-10K-RC271-10K-RC10.0KXBK-ND1
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R11100K 1% 0.25W metal film resistorXicon271-100K-RC271-100K-RC100KXBK-ND1
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R131M 1% 0.25W metal film resistorXicon271-1.0M-RC271-1.0M-RC1.00MXBK-ND1
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RF24.9K 1% 0.25W metal film resistorXicon271-24.9K-RC271-24.9K-RC24.9KXBK-ND1
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RL150K 1% 0.25W metal film resistorXicon271-150K-RC271-150K-RC150XBK-ND1
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RZ5.1K 1% 0.25W metal film resistorXicon271-5.1K-RC271-5.1K-RC5.11KXBK-ND1Value is suitable for the EA2622 transformer.
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D1, D2, D31N4148 - small signal diodeFairchild1N4148512-1N41481N4148FS-ND3
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D4, D51N4007 - 1A/1000V diodeFairchild1N4007512-1N40071N4007FSCT-ND2
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Q1BC560C PNP transistorFairchildBC560C512-BC560CTABC560CTACT-ND1
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RL1, RL2, RL3DPDT signal switching relayPanasonic EWTQ2-12V769-TQ2-12V255-1002-5-ND3
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RV125K CCW audio taper (log) pot.Bourns51CAN-D20-G17L652-51CAN-D20-G17L-1Can be obtained from Mouser / Classic API or use any other 25K Reverse Log pot.
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SW1, SW2, SW3DPDT push buttonC&KF2UEE611-F2UEE401-1223-ND3
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SW1-CAPWhite PB cap for SW1C&KF0102611-F0102 401-1213-ND1
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SW2-CAPGray PB cap for SW2C&KF0104611-F0104401-1214-ND1
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SW3-CAPBlack PB cap for SW3C&KF0101611-F0101401-1212-ND1
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TX1Input TX API 2622 type----1Several options available. See the ML12 manual for more details.
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TX2Output TX API 2503 type----1Several options available. See the ML12 manual for more details.
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U1Discrete Op-Amp (2520 footprint)--
--1Most discrete opamps will work in the ML12 preamp. Whistle Rock Audio offers several options that have been tested and proven in this circuit (ML2520, ML918, RED-25 and BLU-18).
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LED1Red LED – 2.2V, 20mAEverlightMV5774C638-MV5774C 1080-1123-ND1
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LED2Green LED – 2.2V, 20mAEverlightMV5474C638-MV5474C1080-1115-ND1
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LED3Yellow LED – 2.2V, 20mAEverlightMV5374C638-MV5374C 1080-1106-ND1
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JMP14-pin header – TX1 ratio settingFCI68001-104HLF649-68001-104HLF609-3271-ND1
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JMP22-pin header – DOA output DC blockFCI68001-102HLF649-68001-102HLF 609-3506-ND1
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JUMPERSShunts for JMP1 & JMP23M929953-30517-953-30929953-30-ND3
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SOCKETSPCB sockets for DOAMill-Max0357-0-15-01-34-27-10-0575-035700-6Also, available from the Whistle Rock Audio webstore.
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OUTPUT-TX HDWROutput transformer mounting hardwareWhistle Rock AudioTX-HDWR--1Available from the Whistle Rock Audio webstore.
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PCBML12 v3.1 PC BoardWhistle Rock AudioML12-PCB--1Available from the Whistle Rock Audio webstore.
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J1, J25-way friction-fit PCB (M) headerMolex22-11-2052538-22-11-2052WM2703-ND2Optional Molex connector parts
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J3, J4, J52-way friction-fit PCB (M) headerMolex22-11-2022538-22-11-2022WM2700-ND3
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HS-2PIN2-way wire terminal (F) housingMolex22-01-2027538-22-01-2027WM2011-ND3
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HS-5PIN5-way wire terminal (F) housingMolex22-01-2057538-22-01-2057WM2014-ND2
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Crimp TerminalsGold contact crimp terminalsMolex08-55-0102538-08-55-0102WM2312-ND16
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