I have just completed DAC End assembly. I’ve used LT1085 for the filament regulator, R8,R9 2.2R R11 560R. The supply I/V is 0- 250V and 0-9 V 3A. I was able to adjust for 6.3V and measured 268-274V for HV. I have also applied the LED mod. I did not apply yet SPDIF trafo and I use as SBDIF interface M2TECH HIFACE USB. Tubes are GE 7044. The sound is as described by adamus, sweet yet very detailed although it is not much forgiving for bad recordings.
However I experience an initial relay chattering for two or three seconds before it stabilizes and then the DAC runs with no problems. Also I can hear low frequency hum that becomes noticeable when the music is paused starting from pot position 11 o’clock on my MF X-CANv8 HeadAmp. I have no scope, only a multimeter.
Any hints for the relay chattering and mostly for the hum?
However I experience an initial relay chattering for two or three seconds before it stabilizes and then the DAC runs with no problems. Also I can hear low frequency hum that becomes noticeable when the music is paused starting from pot position 11 o’clock on my MF X-CANv8 HeadAmp. I have no scope, only a multimeter.
Any hints for the relay chattering and mostly for the hum?
Attachments
Update
I’ve changed R8, R9 to 1.2R and no more relay chattering. Also while inspecting the I/V I found excess of solder on HV power connection that was very near the ground, removed it and no more hum. Now is dead quiet. This is a really great DAC.
Thanks Quanghao, Andrea and Sallas.
I’ve changed R8, R9 to 1.2R and no more relay chattering. Also while inspecting the I/V I found excess of solder on HV power connection that was very near the ground, removed it and no more hum. Now is dead quiet. This is a really great DAC.
Thanks Quanghao, Andrea and Sallas.
It is very good to see you back here in the forums.
For a little time it seemed that the DAC END thread was dead and gone. It was very suddenly cut off.
Jeff Davison
For a little time it seemed that the DAC END thread was dead and gone. It was very suddenly cut off.
Jeff Davison
Thank Jeff Davison!
Well I can work, Sorry you had to wait long
Please Update the list yourselves when you type here:
Hi quanghao, I've paid for my set through paypal. Thanks.
1. pathetic (1 set - PAID)
2. cchean ( 2 sets )
3. Lucylu (1 set)
4. Ulyses31 (1 set)
5. damohpi (1 set dac end 2 pcb)
6. mikvous (4 sets)
7. gipione ( 1 set)
8. flocchini (1 6h6P if done, 1 Salas HV)
9. belkoff (full set dac end 2 + 1 6h6P if done, 1 Salas HV) + schematic for each PCB
10. klaju1955 (1 set)
11. ben-jam-in (1 set)
12. morpheous
13. hotzman (2 x full set new dac end 2 pcb)
14. le´flu (one complete set of new DAC-pcb)
15. klie (1 set)
16. Yomanze (1 DAC PCB only)
17. Ferrari (1 full set + 1 extra I/V stage PCB)
18. Sugden (1 set)
19. rolotube (1 set - PAID)
1. pathetic (1 set - PAID)
2. cchean ( 2 sets )
3. Lucylu (1 set)
4. Ulyses31 (1 set)
5. damohpi (1 set dac end 2 pcb)
6. mikvous (4 sets)
7. gipione ( 1 set)
8. flocchini (1 6h6P if done, 1 Salas HV)
9. belkoff (full set dac end 2 + 1 6h6P if done, 1 Salas HV) + schematic for each PCB
10. klaju1955 (1 set)
11. ben-jam-in (1 set)
12. morpheous
13. hotzman (2 x full set new dac end 2 pcb)
14. le´flu (one complete set of new DAC-pcb - PAID)
15. klie (1 set)
16. Yomanze (1 DAC PCB only)
17. Ferrari (1 full set + 1 extra I/V stage PCB)
18. Sugden (1 set)
19. rolotube (1 set - PAID)
2. cchean ( 2 sets )
3. Lucylu (1 set)
4. Ulyses31 (1 set)
5. damohpi (1 set dac end 2 pcb)
6. mikvous (4 sets)
7. gipione ( 1 set)
8. flocchini (1 6h6P if done, 1 Salas HV)
9. belkoff (full set dac end 2 + 1 6h6P if done, 1 Salas HV) + schematic for each PCB
10. klaju1955 (1 set)
11. ben-jam-in (1 set)
12. morpheous
13. hotzman (2 x full set new dac end 2 pcb)
14. le´flu (one complete set of new DAC-pcb - PAID)
15. klie (1 set)
16. Yomanze (1 DAC PCB only)
17. Ferrari (1 full set + 1 extra I/V stage PCB)
18. Sugden (1 set)
19. rolotube (1 set - PAID)
1. pathetic (1 set - PAID)
2. cchean ( 2 sets )
3. Lucylu (1 set)
4. Ulyses31 (1 set)
5. damohpi (1 set dac end 2 pcb)
6. mikvous (4 sets)
7. gipione ( 1 set)
8. flocchini (1 6h6P if done, 1 Salas HV)
9. belkoff (full set dac end 2 + 1 6h6P if done, 1 Salas HV) + schematic for each PCB
10. klaju1955 (1 set)
11. ben-jam-in (1 set)
12. morpheous
13. hotzman (2 x full set new dac end 2 pcb)
14. le´flu (one complete set of new DAC-pcb - PAID)
15. klie (1 set)
16. Yomanze (1 DAC PCB only)
17. Ferrari (1 full set + 1 extra I/V stage PCB - PAID)
18. Sugden (1 set)
19. rolotube (1 set - PAID)
2. cchean ( 2 sets )
3. Lucylu (1 set)
4. Ulyses31 (1 set)
5. damohpi (1 set dac end 2 pcb)
6. mikvous (4 sets)
7. gipione ( 1 set)
8. flocchini (1 6h6P if done, 1 Salas HV)
9. belkoff (full set dac end 2 + 1 6h6P if done, 1 Salas HV) + schematic for each PCB
10. klaju1955 (1 set)
11. ben-jam-in (1 set)
12. morpheous
13. hotzman (2 x full set new dac end 2 pcb)
14. le´flu (one complete set of new DAC-pcb - PAID)
15. klie (1 set)
16. Yomanze (1 DAC PCB only)
17. Ferrari (1 full set + 1 extra I/V stage PCB - PAID)
18. Sugden (1 set)
19. rolotube (1 set - PAID)
Hi Sugden! this is the bom or DAC-end up updat, and you can se it in my web: kit ad1865
Parts List for kit DAC-END
Resistor Vishay/Dale CCF50 1/4W:
470 Ohm x 1 R39
75 Ohm x 1 R41
680Ohm x 1 R40
Resistor Caddoc MK132:
200 Ohm x 2 R37,R38
Capacitor Vishay/BC
0.1uF/12V x 6 C26,C28,C30,C32,C34,C36
0.01uF x 2 C38,C39 (at digital input), C40,C41
68nF/63V x 1 C37
Sanyo os-con - electrolytic capacitors:
47uF/10-16V x 6 C24,C27,C29,C31,C33,C35
Chip
CS8414 x 1 U3 Cirrus Logic Inc
74HC04 x 1 U2 Toshiba
AD1865 NK, NJ, N x 1 U1 Analog Devices
Socket : 28 pin, 24pin, 8pin
Inductor: 120uH x x 2 L1, L2
Led: GREEN LED x 1
SPDIF: Transformer x 1 T2 Newava Technology S22083 or LL1572
Salas Shunt on The DAC
JFet Toshiba
2SK170 x 18 Q2,Q3,Q5,Q8,Q9,Q11,Q14,Q15,Q17 Q20,Q21,Q23,Q26,Q27,Q29,Q32,Q33,Q35 Transistor
Transistor Fairchild Semiconductor
BC560 x 1 Q10
BC550 x 5 Q4,Q16,Q22,Q28,Q34
Mosfet
On Semiconductor International Rectifier (IR)
IRF540 x 2 Q7,Q12
IRF9540 x 10 Q1,Q13,Q19,Q25,Q31,Q6,Q18,Q24,Q30,Q36
Electrolytic Capacitors / Rubycon ZLH
220uf/16V x 6 C3,C7,C11,C15,C19,C23
2200uF-4700uF/25V x 6 C1,C5,C10,C13,C17,C21
Capacitor Illinois Cap & Wima, etc...
0.1uF/25V x 12 C2,C,C6,C10,C14,C18,C22,,C4,C8,C12,C16,C20,C24
Resistor Vishay / Dale CCF50 1/4W
10 Ohm x 6 R4,R11,R16,R22,R28,R34,
47 Ohm x 6 R5,R11,R17,R23,R29,R35
100 Ohm x 6 R3,RR9,R15,R21,R27,R33
220 Ohm x 12 R2,R8,R14,R20,R26,R32,R6,R12,R18,R24,R30,R36
Resistor Vishay / Dale CCF50 2W
33 Ohm / 2W x 6 R1,R7,R13,R19,R25,R31
Led Green Led x 18 L1-L18
Diode VISHAY 1N5819
2A/800V x 24 D1-D24
Trimmer Fairchild Semiconductor
VR 1K Ohm x 6 VR1-VR6
Tranformer
9-12 V/100-200mA x 6
Parts List for kit DAC-END
Resistor Vishay/Dale CCF50 1/4W:
470 Ohm x 1 R39
75 Ohm x 1 R41
680Ohm x 1 R40
Resistor Caddoc MK132:
200 Ohm x 2 R37,R38
Capacitor Vishay/BC
0.1uF/12V x 6 C26,C28,C30,C32,C34,C36
0.01uF x 2 C38,C39 (at digital input), C40,C41
68nF/63V x 1 C37
Sanyo os-con - electrolytic capacitors:
47uF/10-16V x 6 C24,C27,C29,C31,C33,C35
Chip
CS8414 x 1 U3 Cirrus Logic Inc
74HC04 x 1 U2 Toshiba
AD1865 NK, NJ, N x 1 U1 Analog Devices
Socket : 28 pin, 24pin, 8pin
Inductor: 120uH x x 2 L1, L2
Led: GREEN LED x 1
SPDIF: Transformer x 1 T2 Newava Technology S22083 or LL1572
Salas Shunt on The DAC
JFet Toshiba
2SK170 x 18 Q2,Q3,Q5,Q8,Q9,Q11,Q14,Q15,Q17 Q20,Q21,Q23,Q26,Q27,Q29,Q32,Q33,Q35 Transistor
Transistor Fairchild Semiconductor
BC560 x 1 Q10
BC550 x 5 Q4,Q16,Q22,Q28,Q34
Mosfet
On Semiconductor International Rectifier (IR)
IRF540 x 2 Q7,Q12
IRF9540 x 10 Q1,Q13,Q19,Q25,Q31,Q6,Q18,Q24,Q30,Q36
Electrolytic Capacitors / Rubycon ZLH
220uf/16V x 6 C3,C7,C11,C15,C19,C23
2200uF-4700uF/25V x 6 C1,C5,C10,C13,C17,C21
Capacitor Illinois Cap & Wima, etc...
0.1uF/25V x 12 C2,C,C6,C10,C14,C18,C22,,C4,C8,C12,C16,C20,C24
Resistor Vishay / Dale CCF50 1/4W
10 Ohm x 6 R4,R11,R16,R22,R28,R34,
47 Ohm x 6 R5,R11,R17,R23,R29,R35
100 Ohm x 6 R3,RR9,R15,R21,R27,R33
220 Ohm x 12 R2,R8,R14,R20,R26,R32,R6,R12,R18,R24,R30,R36
Resistor Vishay / Dale CCF50 2W
33 Ohm / 2W x 6 R1,R7,R13,R19,R25,R31
Led Green Led x 18 L1-L18
Diode VISHAY 1N5819
2A/800V x 24 D1-D24
Trimmer Fairchild Semiconductor
VR 1K Ohm x 6 VR1-VR6
Tranformer
9-12 V/100-200mA x 6
And the bom of iv satge use tub 6h30, 6h6, 6dj8:
IV stage for DAC-END
Composite-Triode
1. Resistor
R1,R31 = 22R/2W
R16 - R20A = 18K/2W
R32 - R36A = 18K/2W
R22,21,37,38 = 200R
R23,24,39,40 = 470K
R25,26,27,28 = 2K
R41,42,43,44 = 2K
R29,30,45,46 =220K
R52 = 10R
Resistor RELAY
ALL 1/4W
R47 = 220K
R48= 1K
R49 = 5.6K
R50,51 = 4.7K
2. Caps
C16, 22: 47uF/450V
C19, 21 ,24, 26 = 220uF/16V
C19,20,25,26 = 0.1uF
Caps -output:
C17, 23: 0.47 - 1uF/450V
Caps RELAY
C28: 47 - 220uF/12V
3. DS2Y RELAYS 5v X 1
4. Transitor
Q1: BC337
5. IC: LM311
6.Diot: D19, d20 = 1N4007 or better
7.Tube: V1, V2 = 6H30Pi, 6H6Pi, or 6dj8 x 2
8 . Tube Socket 9 PIN X 2
9. PCB I/v stage X 1
Note:
1. All resistor 1/4W or 1W
2. R1, R31: 22R/2W. R16 - R20A use 2W. R32 - R36A use 2W
2. The delay time : 0.45 minutes
Use Tube:
1.Tube 6H6PI:
+B = 270V. R22, R21, R37, R38 = 400R - 470R.
2.Tube 6H30PI:
+B = 230V. R22, R21, R37, R38 = 200 - 220R.
3.Tube 6DJ8 or 6H23:
+B = 200V. R22, R21, R37, R38 = 280R - 300R.
* R16 - R20A = 47K/2W .
* R32 - R36A = 47K/2W.
Parts List Salas Shunt for iV stage
JFet
2SK170 x 1 Q4
Transistor
2N2906 x 1 Q5
MJE 350x 1 Q2
MosFfet
IRF9160 x 1 Q1
IRF840 x 1 Q3,Q15
IC
LT1084, 85 Or LM 317 x 1 U1
Capacitor
220uf/450V x 2 C4,C5
1uf/450V x 2 C2,C3
100uF/25V x 1 C1
4700uF/16V x 2 C10,C11
470uF/16V x 2 C12,C14
47uF/16V x 1 C13
0.1uf/16V x 5
Resistor 1/2W
3.3 Ohm x 1 R7
47 Ohm x 2 R9,R10
200-220 Ohm x 1 R13,R2,R6
6.8K Ohm x 1 R14
Resistor 2W
33 Ohm x 1 R1
5.6 K Ohm x 1 R5
120 K Ohm x 1 R4
100 Ohm x 2 R15,R16
Resistor 5W
56K x 1 R3
Trimmer
2-5 K Ohm x 1 VR2
500-1K x 1 VR1
Led Green Led 3 D2,D3,D4
Diode
Diode 4A x 4 D13,D14,D15,D16
Diode 1N4007 x 2 D17,D18
Diode 2A/800V x 4 D9,D10,D11,D12
Diode Zenner
1n4172
TRANFORMER
SALAS SHUNT 1 0-200-250V/100mA
Filament x 1 0-8V or 0-9V/2A
Heatsink
10W x 2 Q1,Q3
5-10W x 1 U1
Jump
3 x 2
PCB
SSHV x 1 QUANGHAO
IV stage for DAC-END
Composite-Triode
1. Resistor
R1,R31 = 22R/2W
R16 - R20A = 18K/2W
R32 - R36A = 18K/2W
R22,21,37,38 = 200R
R23,24,39,40 = 470K
R25,26,27,28 = 2K
R41,42,43,44 = 2K
R29,30,45,46 =220K
R52 = 10R
Resistor RELAY
ALL 1/4W
R47 = 220K
R48= 1K
R49 = 5.6K
R50,51 = 4.7K
2. Caps
C16, 22: 47uF/450V
C19, 21 ,24, 26 = 220uF/16V
C19,20,25,26 = 0.1uF
Caps -output:
C17, 23: 0.47 - 1uF/450V
Caps RELAY
C28: 47 - 220uF/12V
3. DS2Y RELAYS 5v X 1
4. Transitor
Q1: BC337
5. IC: LM311
6.Diot: D19, d20 = 1N4007 or better
7.Tube: V1, V2 = 6H30Pi, 6H6Pi, or 6dj8 x 2
8 . Tube Socket 9 PIN X 2
9. PCB I/v stage X 1
Note:
1. All resistor 1/4W or 1W
2. R1, R31: 22R/2W. R16 - R20A use 2W. R32 - R36A use 2W
2. The delay time : 0.45 minutes
Use Tube:
1.Tube 6H6PI:
+B = 270V. R22, R21, R37, R38 = 400R - 470R.
2.Tube 6H30PI:
+B = 230V. R22, R21, R37, R38 = 200 - 220R.
3.Tube 6DJ8 or 6H23:
+B = 200V. R22, R21, R37, R38 = 280R - 300R.
* R16 - R20A = 47K/2W .
* R32 - R36A = 47K/2W.
Parts List Salas Shunt for iV stage
JFet
2SK170 x 1 Q4
Transistor
2N2906 x 1 Q5
MJE 350x 1 Q2
MosFfet
IRF9160 x 1 Q1
IRF840 x 1 Q3,Q15
IC
LT1084, 85 Or LM 317 x 1 U1
Capacitor
220uf/450V x 2 C4,C5
1uf/450V x 2 C2,C3
100uF/25V x 1 C1
4700uF/16V x 2 C10,C11
470uF/16V x 2 C12,C14
47uF/16V x 1 C13
0.1uf/16V x 5
Resistor 1/2W
3.3 Ohm x 1 R7
47 Ohm x 2 R9,R10
200-220 Ohm x 1 R13,R2,R6
6.8K Ohm x 1 R14
Resistor 2W
33 Ohm x 1 R1
5.6 K Ohm x 1 R5
120 K Ohm x 1 R4
100 Ohm x 2 R15,R16
Resistor 5W
56K x 1 R3
Trimmer
2-5 K Ohm x 1 VR2
500-1K x 1 VR1
Led Green Led 3 D2,D3,D4
Diode
Diode 4A x 4 D13,D14,D15,D16
Diode 1N4007 x 2 D17,D18
Diode 2A/800V x 4 D9,D10,D11,D12
Diode Zenner
1n4172
TRANFORMER
SALAS SHUNT 1 0-200-250V/100mA
Filament x 1 0-8V or 0-9V/2A
Heatsink
10W x 2 Q1,Q3
5-10W x 1 U1
Jump
3 x 2
PCB
SSHV x 1 QUANGHAO
What ratio should a audiotransformer at the DAC output have,if I don´t wanna use the tube output?
What ratio should a audiotransformer at the DAC output have,if I don´t wanna use the tube output?
i don't understand what do you ưant?? can you show mean??
Ok, I don´t want to use the tube output,I want to use a transformer instead.
And the AD1865 is outputting 127mv on the audiooutput, if I want 2vRms does it mean the transformer should be 1:16 ?
And the AD1865 is outputting 127mv on the audiooutput, if I want 2vRms does it mean the transformer should be 1:16 ?
Sowter Transformer 9762 DAC INTERFACE FOR AD1865N-J can give 22db gain with 200ohm, that is
if we use the formula db = 20Log10(Vout/Vin) and resolving for Vout, output should be around 2.52V if I'm not wrong.
if we use the formula db = 20Log10(Vout/Vin) and resolving for Vout, output should be around 2.52V if I'm not wrong.
What is Salas' opinion now for the Rubycon ZLH caps in the shunt supply? He was thinking not to have those any longer.
If he changed his mind where are you guys sourcing them.
On the rest of the BOM file parts are sourced from Digikey?
If he changed his mind where are you guys sourcing them.
On the rest of the BOM file parts are sourced from Digikey?
Input transformer?
I did some research and according to many digital designers and transformer builder they recommend the Digital Audio Transformer SC947-02 by Scientific Conversion. Wondering if anyone tried it?
Scientific Conversion, Inc. - Transformers and Inductors
I did some research and according to many digital designers and transformer builder they recommend the Digital Audio Transformer SC947-02 by Scientific Conversion. Wondering if anyone tried it?
Scientific Conversion, Inc. - Transformers and Inductors
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