Hi guys,
We are almost ready to send the samples for the next month. (V5i, V6 Classic or Vivid). We have a few free samples available. Please pm me if you would like to test them.
Supreme Sound Opamp V5i – Burson Audio
Supreme Sound Opamp V6 – Burson Audio
Thanks,
We are almost ready to send the samples for the next month. (V5i, V6 Classic or Vivid). We have a few free samples available. Please pm me if you would like to test them.
Supreme Sound Opamp V5i – Burson Audio
Supreme Sound Opamp V6 – Burson Audio
Thanks,
Hello,
Purchased the PCB and found most of the parts at mouser. Does anyone know what tranformer that will be in the parts kit still not available?
I have found the 70065K 22 v sec and the 70065K 18 v sec.
Also any real advantage with either one? besides more heat etc?
Thanks!
Alex
Purchased the PCB and found most of the parts at mouser. Does anyone know what tranformer that will be in the parts kit still not available?
I have found the 70065K 22 v sec and the 70065K 18 v sec.
Also any real advantage with either one? besides more heat etc?
Thanks!
Alex
I think that the 22V will allow higher output power on very demanding impedances, like 32ohms or below.
It's also possible that you will not be able to increase the output bias as much with the 18V version.
But that's pure speculation as I did not measure or do the math.
From what I see in those pages, your should be OK with the 18V version.
What headphones do you plan to pair it with?
I use the 22V transfo with 80mA/6.8Ohms output bias, and regulators are very hot despite the bigger heatsinks. 18V transfo will give much less waste on the regs.
The caps next to my regs are also getting warm which is not great for lifetime I think.
Something to take into account if you plan a compact build.
It's also possible that you will not be able to increase the output bias as much with the 18V version.
But that's pure speculation as I did not measure or do the math.
From what I see in those pages, your should be OK with the 18V version.
What headphones do you plan to pair it with?
I use the 22V transfo with 80mA/6.8Ohms output bias, and regulators are very hot despite the bigger heatsinks. 18V transfo will give much less waste on the regs.
The caps next to my regs are also getting warm which is not great for lifetime I think.
Something to take into account if you plan a compact build.
If you are building the whammy with 24v rails and regulators, (which limits you to the OPA2604 only) and are planning to drive an F4 to clipping, use 22v.
If you are going to use as a linestage and/or headphone amp use 18v transformer with 15-18v rails.
Either option will drive any headphone to ear-damaging levels.
If you are going to use as a linestage and/or headphone amp use 18v transformer with 15-18v rails.
Either option will drive any headphone to ear-damaging levels.
Hello,
Purchased the PCB and found most of the parts at mouser. Does anyone know what tranformer that will be in the parts kit still not available?
I have found the 70065K 22 v sec and the 70065K 18 v sec.
Also any real advantage with either one? besides more heat etc?
Thanks!
Alex
As others have pointed out, 18V transformer is plenty. You can also use any other encapsulated or potted transformer. Like this one (30VA 2x18V).
You only need to drill one 4-4.5mm hole in the PCB.
Attachments
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Okay guys, as promised here is a review of the rest of the OP Amps I bought to test in the whammy. These ones are all on 8P-DIP adapters:
Again I used my HiFiMan HE400i headphones and Topping D50 DAC. I used FLAC audio 96Khz 24 bit. Evanescence Synthesis album.
8P-DIP Adapter based OP Amps:
OPA1622 SoundPlus:
Operating Voltage: 18v MAX
Slew Rate: 10v/µs
DC Offset: L -152.6mV / R -154.2mV
FET: No
Package: VSON-8
Notes: This is an excellent OP Amp, High clarity, wide sound stage, no noticable distortion, this one is truly stunning from the mids and trebles right through to the vocals. DC offset is extremely high in this one. Maybe due to the extra onboard components of the DIP adapter. There are some resistors and capacitors.
OPA1662 SoundPlus:
Operating Voltage: 36v MAX
Slew Rate: 17v/µs
DC Offset: L 76.2mV / R 74.8mV
FET: No
Package: SOIC-8
Notes: Very wide sound stage, clear with good mids and trebles, vocals prominent and up front. Overall nice sounding OP Amp. DC offset is also quite high.
OPA2189:
Operating Voltage: 36v MAX
Slew Rate: 20v/µs
DC Offset: L -0.1mV / R -0.2mV
FET: No
Package: VSSOP-8
Notes: This is quite a nice OP Amp with clear vocals, wide soundstage and balanced mids and trebles. Very low DC offset.
OPA1692 SoundPlus:
Operating Voltage: 36v MAX
Slew Rate: 23v/µs
DC Offset: L -34.8mV / R -34.9mV
FET: No
Package: SOIC-8
Notes: Crystal clear, good sound stage and up front vocals. Sounds really nice this one.
OPA2210:
Operating Voltage: 18v MAX
Slew Rate: 6.4v/µs
DC Offset: L -0.1mV / R -0.2mV
FET: No
Package: SOIC-8
Notes: This OP Amp sounds incredible. Very wide soundstage, clear mids and treble with vocals just at the right distance. This one really brings out the finer details. Very low DC offset. Really like this one.
Hello Gaz,
Thanks a lot for your intensive testing. How would you describe the differences between OPA1692 and OPA2189?
Thank you very much,
Martin
Got the PCB today.
I ordered the 70065K 22v sec from digikey. $23
Also wondering the .1uf cap from the RCA's to case ground is a .1uf Film cap..
Can this be a ceramic cap as well?
THanks
Alex
I ordered the 70065K 22v sec from digikey. $23
Also wondering the .1uf cap from the RCA's to case ground is a .1uf Film cap..
Can this be a ceramic cap as well?
THanks
Alex
Another basic question?
Will using a 22v sec xfmr vs a lower voltage one with 15 or 18 v sec limit the op amps that can be used safely in this amp?
If so what xfmr would be ideal to use to use the most op amps available in the amp "safely".
Or would the 22 v sec xfmr be "ok" and just run hotter?
Thanks
ALex
NOTE: 70065K - 22v
70064K - 18v
70063K - 15v
Will using a 22v sec xfmr vs a lower voltage one with 15 or 18 v sec limit the op amps that can be used safely in this amp?
If so what xfmr would be ideal to use to use the most op amps available in the amp "safely".
Or would the 22 v sec xfmr be "ok" and just run hotter?
Thanks
ALex
NOTE: 70065K - 22v
70064K - 18v
70063K - 15v
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Along the lines of my questions I was wondering about 6L6's comment:
If you set the whammy PSU at +/- 15V you could run meldano's Muses volume from it.
I would LOVE to try that. I've been interested in the Muses for a long time.
Dose this mean if I use the option 2, naked regulators and short out R9 and R13 I will be safe with the 22v xfmr due to this having the regs output at +/- 15 vdc?
Thanks for the help!
Once i get my head around this I will be soldering!
Alex
This may be the answer: Jumper the diodes and let the regulators run not elevated... Easy 15v.
If you set the whammy PSU at +/- 15V you could run meldano's Muses volume from it.
I would LOVE to try that. I've been interested in the Muses for a long time.
Dose this mean if I use the option 2, naked regulators and short out R9 and R13 I will be safe with the 22v xfmr due to this having the regs output at +/- 15 vdc?
Thanks for the help!
Once i get my head around this I will be soldering!
Alex
This may be the answer: Jumper the diodes and let the regulators run not elevated... Easy 15v.
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Alex - correct.
But please review the ‘naked regulator’ configuration, you do not jumper the diodes...
But please review the ‘naked regulator’ configuration, you do not jumper the diodes...
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Great.
I copied a post u made in the thread somewhere...so ok to use the 22v sec xfmr just go with the naked reg configuration and I will be able to use most any op amp!
So its omit the D5/6 leds and jumper R9 and R13.
Thanks for the info!
Alex
I copied a post u made in the thread somewhere...so ok to use the 22v sec xfmr just go with the naked reg configuration and I will be able to use most any op amp!
So its omit the D5/6 leds and jumper R9 and R13.
Thanks for the info!
Alex
Great...
On another point I wathced the Wayne C. video and the 24v OPA2604 seems to be nowhere available?
Are there any secret stashes out there at all??
Alex
On another point I wathced the Wayne C. video and the 24v OPA2604 seems to be nowhere available?
Are there any secret stashes out there at all??
Alex
I got opa604 then got an adaptor
https://www.mouser.com/ProductDetail/Texas-Instruments/OPA604AU?qs=wgAEGBTxy7mtgzYHZOMoUw==
These are single channel versions, you need 2
https://www.mouser.com/ProductDetail/Texas-Instruments/OPA604AU?qs=wgAEGBTxy7mtgzYHZOMoUw==
These are single channel versions, you need 2
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Thanks thats a great idea!
I was thinking about the build and my mind is grapling the choices of xfmrs and regulator configurations.
Its nice to be able to set these up via the 3 configs.
I was wondering if it makes and sense, or rather would this idea work or not:
According to Wayne, I read 104 pages of the thread so far...and ready that simply jumpering the R9 and R13 will set the regs to 15v.I also read someone asking if they needed to "remove" the diodes D5 and D6, the reply was just short out R9/13. Implying that u could leave the diodes in the circuit.
So building with a 22 v sec xfmr, using the config #1 LED....and then just install a DPDT switch to short R9/13 when u want to lower the voltage to 15 v?
Then I guess if it can be switched when the amp is on, install on the front panel or if not install a switch or slide switch mounted on the pcb so when u want to try a low voltage op amp you could set the switch's?
Just thinking out loud here.
Thanks
Alex
I was thinking about the build and my mind is grapling the choices of xfmrs and regulator configurations.
Its nice to be able to set these up via the 3 configs.
I was wondering if it makes and sense, or rather would this idea work or not:
According to Wayne, I read 104 pages of the thread so far...and ready that simply jumpering the R9 and R13 will set the regs to 15v.I also read someone asking if they needed to "remove" the diodes D5 and D6, the reply was just short out R9/13. Implying that u could leave the diodes in the circuit.
So building with a 22 v sec xfmr, using the config #1 LED....and then just install a DPDT switch to short R9/13 when u want to lower the voltage to 15 v?
Then I guess if it can be switched when the amp is on, install on the front panel or if not install a switch or slide switch mounted on the pcb so when u want to try a low voltage op amp you could set the switch's?
Just thinking out loud here.
Thanks
Alex
Has anyone here tried the AD797BRZ in the Whammy? I heard good things about this one at the Head-Fi op amp thread. How does it compare with the OPA627?
Alex - Please review the photos and text at the top of this thread concerning the regulator choices . The diodes are not installed in the 'naked regulator' configuration.
Jimmy - AD797 is a single, you'll need a dingle to dual adaptor. Also limited to 15V rails.
Jimmy - AD797 is a single, you'll need a dingle to dual adaptor. Also limited to 15V rails.
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