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F1 QUAD 405 Evolution September 2011 + R7 3.3k C5 100u R14 560R D1 R6 330k Input C1 680n R3 22k 2 IC1 R4 10k R1 220k 3 - R10 1k 8 6 LM301A + C7 330p R17 3.3k C8 120p R23 3.3k C11 330p C9 330p Tr2 ZTX304 + C3 3.3p C2 100u 3V C6 1n R20 1k R16 180R R2 R21 1k R27 8.2k Tr9 BDY77 R38 47R L2 3u Output C12 100n Dumpers-out + R25 22R D4 IS920 R37 22R Tr8 40872 D2 LR120C First Production PCB M12368 iss. 5 ? R30 560R R31 560R R29 8.2k L1 6.8u + C10 47u C14 10,000u Tr10 BDY77 R33 22R F2 4A R5 d.c. feedback 10k QUAD 405 Schematic as published in Wireless World Dec.1975 to support the article “Current Dumping Audio Amplifier” by P J Walker ot the Acoustic Manufacturing Co. Ltd. (Q.U.A.D.) Revision: 2 [email protected] Page Size: A4 QUAD 405 M12333 iss. 2 2 Mar 2002 Drawn: K. Snook Checked: SK2 R39 10R R36 0.08R R28 75R Tr6 BC214C 2.2R R8 3.3k red R40 2.7k 2W D5 IS920 D6 IS920 ClassA-out R12 3.3k 1 4 D8 Tr7 40872 C13 10,000u R19 3.3k C4 47n 7 Tr4 ZTX504 Tr3 ZTX504 R13 22k D3 IS920 R24 22R + R11 1.8k R9 180R Tr5 BC214C R22 270R Tr1 BC214C LR120C R11 is Limiter for ESL57 Speakers R18 3.3k R15 100R +50V 4A R35 0.08R R26 75R Page 1 of 1 -50V FS1 + R7 3.3k C5 100u R14 560R D1 LR120C Input C1 680n R3 22k 2 IC1 R4 22k R1 220k 3 - 6 C11 330p R12 3.3k R17 3.3k Tr2 ZTX304 C8 120p + C3 3.3p C2 100u 3V R20 1k C6 1n R16 180R R2 R21 1k D6 IS920 Tr9 BDY77 R38 47R Output C12 100n Dumpers-out C10 47u D4 IS920 Tr8 40872 R30 560R R31 560R R37 22R L1 6.8u Tr10 BDY77 R29 8.2k R33 22R Note: This point is connected to input ground but ideally should be connected to other side of R2 FS2 d.c. feedback 4.7k M12368 iss. 7 PCBs were used for serial numbers from ?? to 9000 [email protected] Revision: 1 Page Size: A4 QUAD 405 - M12333 iss. 3 8 Feb 2003 Drawn: K. Snook Checked: C14 10,000u C18 47n 4A R5 + D2 LR120C R25 22R Speaker R39 10R R36 0.08R R28 75R Tr6 BC214C + R8 3.3k red R40 2.7k 2W R27 8.2k L2 3u 10R Input ground must be connected to chassis at DIN socket to prevent oscillation see - R39 C12 D8 D5 IS920 ClassA-out 1 4 Tr7 40872 Tr4 ZTX504 Tr3 ZTX504 R23 1.2k R10 1k 8 D3 IS920 C13 10,000u C7 330p 7 R24 22R R13 22k C4 47n LM301A + R9 220R R11 1.8k R6 330k Tr1 BC214C Tr5 R22 BC214C 270R R18 3.3k +50V 4A + R11 is Limiter for ESL57 Speakers R15 100R R35 0.08R R26 75R Page 1 of 1 -50V F1 + R7 3.3k C5 100u R14 560R D1 LR120C Input C1 680n R3 22k 2 IC1 R4 22k R1 220k 3 - R10 1k 8 6 + C3 3.3p C2 100u 3V R12 3.3k R17 3.3k Tr2 ZTX304 C8 120p R20 1k C6 1n R16 180R R2 R21 1k M12368 iss.9 PCBs used for serial numbers from 9000 to 29000 R43 22R T1 2N4992 D6 IS920 R27 8.2k Tr9 BDY77 R38 47R C13 10,000u R40 2.7k 2W T2 SC1418 Output C12 100n Dumpers-out Tr6 Bc214C R25 22R C10 47u D4 IS920 R37 22R Tr8 40872 R30 560R R31 560R L1 6.8u Note: This point is connected to input ground but ideally should be connected to other side of R2 C14 10,000u C19 1n R29 8.2k Tr10 BDY77 R33 22R C16 100n F2 d.c. feedback 4.7k [email protected] Revision: 1 Page Size: A4 QUAD 405 - M12333 iss. 4 8 Feb 2003 Speaker R39 10R R36 0.08R R28 75R 4A R5 red + D2 LR120C R42 15k D5 IS920 L2 3u + R8 3.3k D8 C17 10u ClassA-out 10R Input ground must be connected to chassis at DIN socket to prevent oscillation see - R39 C12 L3 6.8u R41 22R Tr7 40872 C11 330p 1 4 D3 IS920 Tr4 ZTX504 R23 1.2k C7 330p 7 Tr3 ZTX504 R24 22R R13 22k C4 47n LM301A + R9 220R R11 1.8k R6 330k Tr1 BC214C Tr5 R22 BC214C 270R R18 3.3k + R11 is Limiter for ESL57 Speakers R15 100R +50V C15 4A 100n R35 0.08R R26 75R Drawn: K. Snook Checked: Page 1 of 1 -50V F1 + R7 3.3k R11 1.8k Input C1 680n R3 22k 2 IC1 R4 22k R1 220k 3 6 + C3 3.3p C2 100u 3V R12 3.3k R17 3.3k Tr2 ZTX304 C8 120p R20 1k C6 1n R16 180R R2 R21 1k D2 LR150C R43 22R T1 2N4992 D6 IS920 R27 15k Tr9 BDY77 R38 47R C13 10,000u R40 2.7k 2W T2 SC1418 Output C12 100n Dumpers-out Tr6 Bc214C R25 22R C10 47u D4 IS920 R37 22R Tr8 40872 R30 560R L1 6.8u Note: This point is connected to input ground but ideally should be connected to other side of R2 C14 10,000u C19 1n R29 15k Tr10 BDY77 R33 22R C16 100n F2 4A d.c. feedback 4.7k [email protected] Revision: 2 Page Size: A4 QUAD 405 - M12333 iss. 5 8 Feb 2003 Speaker R39 10R R36 0.091R R28 75R R31 560R R5 red + R8 3.3k M12368 iss. 9 &10 PCBs used for serial numbers from 29000 to 59000 iss. 10 PCBs same as issue 9 except power transistor pads modified for production. R42 15k D5 IS920 L2 3u + -15V D8 C17 10u ClassA-out 10R Input ground must be connected to chassis at DIN socket to prevent oscillation see - R39 C12 L3 6.8u R41 22R Tr7 40872 C11 330p 1 4 D3 IS920 Tr4 ZTX504 R23 1.2k R10 1k8 LM301A Tr3 ZTX504 R24 22R R13 22k C7 330p 8 + R9 220R C4 47n 7 - Tr1 BC214C Tr5 R22 BC214C 270R R18 3.3k + R11 is Limiter for ESL57 Speakers R15 100R R14 560R D1 LR150C +15V R6 330k C5 100u +50V C15 4A 100n R35 0.091R R26 75R Drawn: K. Snook Checked: Page 1 of 1 -50V F1 +50V 4A + R7 3.3k C5 100u R14 470R D1 BZY88-C15 Input C1 680n R3 22k C7 330p C4 47n 2 IC1 R4 22k 3 7 8 6 TL071 + R10 560R R12 3.3k Tr2 ZTX304 1 4 C3 3p3 R1 220k D8 BZY88-C5V6 D9 BZY88-C8V2 + C2 100u 3V C6 1n R16 180R D8 Tr7 40872 R23 1.2k R17 3.3k C8 - 120p R21 1k T2 SC1418 R38 47R Output C12 100n Dumpers-out R36 0.091R R28 75R Tr6 BC214C R25 22R C10 47u R30 560R R31 560R R5 Tr9 2SD424 D4 IS920 R37 15R C14 10,000u Tr10 2SD424 R29 15k Speaker R39 10R L4 22u Tr8 40872 D2 BZY88-C15 R40 2.7k 2W R43 22R D11 1N4003 C16 100n F2 R33 22R -50V 4A d.c. feedback 4.7k [email protected] Revision: 2 Page Size: A4 QUAD 405 - M12333 iss. 6 12 March 2004 Drawn: K. Snook Checked: Page 1 of 1 + R8 3.3k R42 15k T1 2N4992 R27 15k L2 3u + M12565 iss. 3 PCBs were used for serial numbers 59001 to 62500 and 57301 to 57600 D10 1N4003 D6 IS920 ClassA-out R20 1k red C13 10,000u C17 10u D5 IS920 C11 1n Limiter Grounded at input DIN socket D3 IS920 + R6 330k R24 22R Tr3 ZTX504 R13 22k C15 100n Tr5 BC214C Tr4 ZTX504 Tr1 BC214C R2 10R R26 75R R22 270R R18 3.3k R15 100R R35 0.091R FS1 3 2 R14 470R R15 100R R22 270R R18 3.3k C18 47u 3.3k BCW60 D1 BZY88-C15 4 Tr1 BC214C R13 22k R2 10R Tr3 ZTX504 1 5 R6 330k Current Limit Network C1 680n R3 22k C7 330p C4 47n R17 3.3k R23 1.2k 1N4003 Q05 NIA 4 5 C11 1n D5 IS920 Tr9 2SD424 2 R4 22k 3 R1 220k + 7 V+ V4 R12 3.3k R10 560R IC1 Tr2 ZTX304 6 TL071 + C2 100u 3V D8 BZY88-C5V6 D9 BZY88-C8V2 Limiter C6 1n R16 180R R43 22R T1 2N4992 C8 120p R20 1k C13 10,000u C17 10u R42 15k ClassA-out - red R40 2.7k 2W D10 3 N1 BCW61 10k Tr7 40872 Tr4 ZTX504 2 D8 + 1.5k 39V Input C5 100u C15 100n + R7 3.3k 68R 1 2.7k + 1k BCW61 +50V 4A R35 0.18R BCW60 L2 3u Dumpers-out R21 1k T2 SC1418 R38 47R Output C12 100n D6 IS920 Speaker R39 10R R36 0.18R + R37 15R C19 47u C10 47u 2 3 N2 1 R8 3.3k D2 BZY88-C15 C14 10,000u L4 22u Q05 NIA 5 4 R30 560R R31 560R d.c. feedback Tr8 40872 Tr10 2SD424 D11 1N4003 C16 100n FS2 R33 22R R5 4.7k -50V 4A [email protected] Revision: 1 Page Size: A4 QUAD 405 - M12333 iss. 7 8 Feb 2003 Drawn: K. Snook Checked: Page 1 of 1 + + M12565 iss. 5 PCBs (QUAD 405-2) were used for serial numbers from 62501 to 66699 Grounded at input DIN socket FS1 3 2 R14 470R R18 3.3k R15 100R R22 270R C18 47u 3.3k BCW60 D1 BZY88-C15 4 Tr1 BC214C R13 22k R2 10R Tr3 ZTX504 1 R6 330k Current Limit Network C1 680n R3 22k C7 330p C4 47n R17 3.3k R23 1.2k Q05 NIA 4 D13 1N4003 5 C11 1n 1N4003 D5 1N4003 2 R4 22k 3 + R1 220k 7 V+ V4 R10 560R IC1 R12 3.3k Tr2 ZTX304 6 TL071 D8 D9 + C2 100u 3V C8 120p BZY88-C8V2 Limiter R44 R20 1k C6 1n R16 180R L2 3u R21 1k T2 SC1418 R38 47R 75R Dumpers-out BZY88-C5V6 R43 22R T1 2N4992 ClassA-out - C13 10,000u C17 10u R42 15k Tr9 2SD424 red R40 2.7k 2W D10 3 N1 BCW61 5 Tr7 40872 Tr4 ZTX504 2 D8 + 1.5k 39V 10k Input C5 100u C15 100n + R7 3.3k 68R 1 2.7k + 1k BCW61 +50V 4A R35 0.18R BCW60 Output C12 100n D6 1N4003 Speaker R39 10R R36 0.18R + 2 C20 4n7 R37 15R C19 47u C10 47u 3 N2 1 R8 3.3k D2 BZY88-C15 C14 10,000u L4 22u Q05 NIA 5 4 R30 560R R31 560R d.c. feedback Tr8 40872 Tr10 2SD424 D11 1N4003 C16 100n FS2 R33 22R R5 4.7k -50V 4A [email protected] Revision: 1 Page Size: A4 QUAD 405 - M12333 iss. 8 8 Feb 2003 Drawn: K. Snook Checked: Page 1 of 1 + + M12565 iss. 6 PCBs (QUAD 405-2) were used for serial numbers from 69700 to 72500 Grounded at input DIN socket FS1 3 2 R35 0.18R R7 3.3k 68R BCW60 4 R15 100R R22 270R Tr1 BC214C D1 BZY88-C15 R13 22k R2 10R 1 5 C1 680n 2 R6 330k R3 22k Tr7 40872 C7 330p C4 47n R17 3.3k R23 1.2k Q05 NIA 4 D13 1N4003 5 C11 1n 1N4003 D5 1N4003 2 R4 22k 3 + R1 220k 7 V+ V4 R10 560R IC1 R12 3.3k Tr2 ZTX304 6 TL071 D8 D9 C8 120p BZY88-C8V2 + C2 100u 3V Limiter C6 1n R16 180R R21 1k Output R39 10R R37 15R C14 10,000u L4 22u 3 Tr8 40872 Q05 NIA 5 4 R30 560R R31 560R d.c. feedback D11 1N4003 Tr10 17556 C16 100n FS2 R33 22R R5 4.7k -50V 4A [email protected] Revision: 1 Page Size: A4 QUAD 405 - M12333 iss. 9 12 Feb 2003 Drawn: K. Snook Checked: Page 1of 1 + 2 1 D2 BZY88-C15 Speaker + C19 47u C10 47u N2 R8 3.3k C12 100n D6 1N4003 R36 0.18R + C20 4n7 L2 3u T2 SC1418 R38 47R 75R Dumpers-out M12565 iss. 7 PCBs (QUAD 405-2) were used for serial numbers from 72501 to 82999 and 83000 to 84999 with voltage selector omitted Grounded at input DIN socket R44 R20 1k BZY88-C5V6 R43 22R T1 2N4992 ClassA-out - C13 10,000u C17 10u R42 15k Tr9 17556 red R40 2.7k 2W D10 3 N1 BCW61 Current Limit Network D8 C18 47u Tr4 BC556B +50V 4A + 1.5k 39V 10k Input R14 470R 3.3k 1 2.7k C5 100u C15 100n + 1k BCW61 + BCW60 FS1 3 2 R14 470R 3.3k BCW60 4 R22 270R R15 100R Tr1 BC214C D1 BZY88-C15 Tr3 BC556B R13 22k R2 10R C18 47u 1 5 R6 330k Current Limit Network R3 22k Tr7 40872 C7 330p C4 47n R17 3.3k R23 1.2k Q05 NIA 4 5 C11 1n 1N4003 D5 1N4003 D13 1N4003 2 R4 22k 3 + R1 220k 7 V+ V4 R10 560R IC1 R12 3.3k Tr2 ZTX304 6 TL071 D8 D9 BZY88-C8V2 R44 R20 1k L2 3u C6 + R16 180R R21 1k T2 SC1418 R38 47R 75R Dumpers-out 1n C2 100u 3V C8 120p BZY88-C5V6 Output C12 100n D6 1N4003 + R37 15R C19 47u C10 47u 2 3 Tr8 40872 N2 1 R8 3.3k D2 BZY88-C15 C14 10,000u L4 22u Q05 NIA 5 4 R30 560R R31 560R d.c. feedback D11 1N4003 Tr10 17556 C16 100n FS2 R33 22R R5 4.7k -50V 4A Revision: 3 [email protected] Page Size: A4 QUAD 405 - M12333 iss. 10 12 May 2004 Drawn: K. Snook Checked: Page 1of 1 + C20 4n7 R36 0.18R + Ground isolated at phono Speaker R39 10R Limiter M12565 iss. 7 PCBs (QUAD 405-2) used for serial numbers from 85000 onward - Note input earth change with phono input connectors R43 22R T1 2N4992 ClassA-out - C13 10,000u C17 10u R42 15k Tr9 17556 red R40 2.7k 2W D10 3 N1 BCW61 C1 680n 2 D8 + 1.5k 39V 10k Input C5 100u C15 100n + R7 3.3k 68R 1 2.7k + 1k BCW61 +50V 4A R35 0.18R BCW60 F1 R7 2.7k Tr1a(R14) 2SA1085E Tr7 MJE15033 Tr3(Tr4) ZTX753 R13 22k D10 1N4006 D5 1N4006 ClassA-out C4 680n 2% R6 22k 1% - 2 C1 680n 2% Input 3 R4 3.3k 1% R1 220k + C2b 1µ C2 47u 3V 7 IC1 V+ V+ 6 R12 2.7k 1% Tr9 MJ15003 R38 47R 1% R? 10R Tr2 2SC2547E TLE2071 C17 10u R42 15k D13 1N4006 C8 120p 1% 630V +50V C15 100n C13 22,000u 63V + R2 10R 4A R22 270R Tr1b 2SA1085E D1 BZY88-C15 CD1 1µ R35 R15 220R-AOT R43 22R T1 2N4992 T2 SC1418 Output 4 Feedback? C6 1n R3 22k 1% R16 180R 1% R20 1k 2% C12 100n L2 3u D6 1N4006 R21 1k 2% Speaker R39 10R Dumpers-out R36 D2 BZY88-C15 C10 47u L4 22u C14 22,000u 63V Tr8 R30 560R R31 560R Tr10 C16 100n F2 R33 22R MJE15033 R5 D11 1N4006 MJ15003 4A d.c. feedback 4.7k [email protected] Revision: 6 Page Size: A4 QUAD 405 - DCD Mod-3 Sept 2011 Drawn: K. Snook Checked: Page 1 of 1 -50V + R8 2.7k + CD2 1µ R37 15R Components marked in grey with blue reference designators should be removed to disable current limiting - This should be done in conjunction with a change of Tr9 and Tr10 to higher power devices like MJ15003 Tr3 should be bypassed base-emitter as shown and it should then be possible to safely remove C19 fitted across Tr10 collector-base on the solder side of the PCB - If you are not sure bypass Tr3 and leave C19 Components marked in green are changes or additions to the original n.f. = not fitted and Link = remove and wire across. For original sensitivity 0.5V for 100W fit R4 = 1.6k and C2 = 100uF + R7 2.7k C5 n.f. D1 BZV85-C15 CD1 1µ As shown sensitivity is 1V for 100W For sensitivity of 1.5V for 100W fit R4 = 4.7k and C2 = 33uF ESL 57 limit not fitted Input R3 22k 2 R4 3.3k + R1 220k - R13 22k 8 IC1 3 R10 Link + C2 47u 3V 1 4 6 C11 Link Wire to 0V R12 2.7k R38 47R C8 120p re-positioned on rear of PCB Tr2 2SC2547 C6 1n C2b 1µ-3.3µ fitted on rear of PCB R21 1k R16 180R R2 R27 15k Output C12 100n Dumpers-out Tr6 BC214C D2 BZV85-C15 D4 IS920 R25 22R C10 100 R30 560R Tr8 40872 C19 n.f R29 15k L1 6.8u R37 22R C16 100n Tr10 R33 22R C19 can be removed if Tr3 is bypassed but if you cannot check for stabilty leave it in place d.c. feedback R39 10R R36 0.091R R28 75R R31 560R R5 10R L2 3u + R8 2.7k Tr9 D5 1N4003 D6 1N4003 R20 1k 10R CD2 1µ C15 100n R23(R19) n.f. C3 n.f. TL071 or OPA134 OPA604 L3 6.8u R41 22R Tr7 40872 ClassA-out R17 Link +50V 4A D3 IS920 R24 22R Tr4 ZTX753 Tr3 n.f. C7 n.f. 7 Tr5 R22 BC214C 220R R18 n.f. Tr1 2SA1085 C4 680n R6 22k C1 680n R9 Link R15 220R R14 2SA1085 R35 0.091R R26 75R F1 F2 4A 4.7k Note the 2 different ground symbols either side of R2 - probably to prevent internal hum loops The input ground connects to the chassis at the input DIN socket and originally the other side of R2 connects to chassis via the bolt in the heatsink - Even if you do not provide a formal ground wire to the 0V speaker terminal as I show you should ensure that both sides of R2 are at the same potential - If one ground is missing the voltage at the speaker terminals will be about 20mV if both grounds are in place it should be less than 1mV - Both grounds should be connected to chassis [email protected] Revision: 3 Page Size: A4 M12368 PCBs to DCD Mod-3 1 Sept 2008 Drawn: K. Snook Checked: Page 1 of 1 -50V Note: This is only a schematic - It has been implimented as a mod to 12368 iss.10 and 12565 iss.7 PCBs but the cicuit can oscillate at VHF radio frequencies which do not appear at the output but can put the transistors in compression - increasing the distortion and dissipation 3 R4 3.3k 1% R1 220k 3.3u + C2b C2 47u 3V D1 BZY88-C15 - C4 680n 2% 7 V+ R3 22k 1% 4 6 TL071 or TLE2071 OPA134 OPA604 LME49710 Net Audio QUAD 405 Mk3 Mk 3 Circuit diagram schematic Net Audio QUAD 405 Mk3 Mk 3 Circuit diagram schematic Tr4 ZTX753 Tr9 MJ11016 R104 R14 22k R12 2.7k 1% IC1 V+ R2 10R Tr7 MJE15033 D13 1N4006 R38 47R 1% Tr2 2SC2547E 47R Feedback? R16 180R 1% Net Audio QUAD 405 Mk3 Mk 3 Circuit diagram schematic Speaker Output L2 C12 100n 3u R20 1k 2% C8 C6 1n 2% C13 22,000u 63V 120p 1% - Input Net Audio QUAD 405 Mk3 Mk 3 Circuit diagram schematic Tr1b 2SA1085E +50V 4A C15 1µ R106 AOT + 2 R22 270R + R6 22k 1% F1 R15 220R R7 2.7k CD1 1u lookout for updates and refer to my website for further information C1 680n 2% Tr1a 2SA1085E R39 10R R21 1k 2% D6 1N4006 C14 22,000u 63V 47R + R105 Tr10 MJ11015 Net Audio QUAD 405 Mk3 Mk 3 Circuit diagram schematic CD2 1u R8 2.7k D2 BZY88-C15 R101 10k Q45 ZTX653 Tr108 MJE15032 C16 1µ R103 15R R5 Net Audio QUAD 405 Mk3 Mk 3 Circuit diagram schematic F2 -50V 4A 4.7k Note: The “Current Dumpers” Tr9 and Tr10 are complimentary Darlington transistors — This layout WILL NOT work with low hfe output devices due to the base current required — The “Current Dumpers” can be made complimentary MOSFETs If D13 and D6 are changed for resistors but care must be taken to ensure that the Source-gate voltage can be obtained within the limits of Tr7 and Tr108 current drive [email protected] Revision: 3 Page Size: A4 QUAD 405 - DCD Mod-4 1 Apr 2005 Drawn: K. Snook Checked: Page 1 of 1