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"WHAMMY" Pass DIY headphone amp guide
"WHAMMY" Pass DIY headphone amp guide
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Old 5th October 2019, 12:22 PM   #1641
emacs is offline emacs
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used a few hours to finish it, now checking the components value and cap direction as well as clearing solder fulx. hope can hear it asap.
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Old 6th October 2019, 02:48 AM   #1642
GraphicCanuk is offline GraphicCanuk  Canada
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I would like to build this amp, as I want a A topology headphone amp and the design is Pass related, so win win. But for a few reasons I am holding off. As a first time builder there are a few things not the clearest in instructions for me. For one and most vague is the IEC hook up. One spot (above) it has a heading that states 240 volt hook up but I cannot find 110 volt hook up, the heading is either an error and/or They are the same (other then the jumpers). As a visual learner a few more images (less crammed) at this spot if possible would help. The other is, well, a nice case that is milled (i.e. SSII CASE) which I know is being worked on, makes me say hold on for a bit. I am going to go the SSII to route for now as having both tube and class A headphone amps would be great! So if someone could clarify for a rookie the 110 volt IEC wiring my apprehension will be lessened. This would be my first time wiring an internal power supply.
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Old 6th October 2019, 04:26 AM   #1643
emacs is offline emacs
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I finished it now and tested a few time for different Opamp.
The sound is so great even though i did not connect the IEC earth. So i can hear noise when i play and suspend my cellphone player.

I got some data about the amp.
Opamp Vcc+/Vcc- : 16.74V / 16.57V. Is it ok? as the schematic show them are 15V
L/R out to GND without input source voltage are 9.44mV / 10.47mV, it is acceptable?
BTW, the 7815/7915 are too hot.

I have a question, what value of capacitor should i install on the RCA-GND to IEC earth?
I saw many people added this capacitor on their work.
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Old 8th October 2019, 08:57 PM   #1644
sp33ls is offline sp33ls
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Whatever happened to that DIYAudio Chassis for the Whammy? I've been holding off on completing three kits for friends due to wanting to use that chassis instead.
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Old 8th October 2019, 10:45 PM   #1645
wayne is offline wayne  United States
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"WHAMMY" Pass DIY headphone amp guide
Emacs your power supply Voltages are okay since you have the red leds in.
How hot are the voltage regulators? Unless the bias is super high for some reason they shouldn't be over 55 C.
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Old 8th October 2019, 10:59 PM   #1646
Jason is offline Jason  Australia
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"WHAMMY" Pass DIY headphone amp guide
Quote:
Originally Posted by sp33ls View Post
Whatever happened to that DIYAudio Chassis for the Whammy? I've been holding off on completing three kits for friends due to wanting to use that chassis instead.
Last month it was with a designer who had an urgent family matter to attend to. I will follow up...
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Old 9th October 2019, 09:25 AM   #1647
nano35 is offline nano35  Hong Kong
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I haven't used the stock whammy for awhile (I used it everyday awhile back).
Today I turned it on.

The 4 FQP FETs are 80 degrees C hot!
The 7815/7915 Regs are 60 degrees C.
The 6 filtering caps are 50 degrees C.
Transformer is 35 degrees C.
But the music sounds great.
DC offset is -1.3mV for both channels. I remember it is less than 0.5mV before.
I also remember the filtering caps are only warm before and all the heatsinks are not this untouchably scorching.
OP AMP is 94720-not hot at all.

Where should I trouble shoot?

Thanks!
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Old 9th October 2019, 01:42 PM   #1648
rich1051414 is offline rich1051414
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Quote:
Originally Posted by nano35 View Post
I haven't used the stock whammy for awhile (I used it everyday awhile back).
Today I turned it on.

The 4 FQP FETs are 80 degrees C hot!
The 7815/7915 Regs are 60 degrees C.
The 6 filtering caps are 50 degrees C.
Transformer is 35 degrees C.
But the music sounds great.
DC offset is -1.3mV for both channels. I remember it is less than 0.5mV before.
I also remember the filtering caps are only warm before and all the heatsinks are not this untouchably scorching.
OP AMP is 94720-not hot at all.

Where should I trouble shoot?

Thanks!
How much current is it drawing at idle? I would check the bias resistors first, to make sure they haven't drifted.

Last edited by rich1051414; 9th October 2019 at 01:45 PM.
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Old 9th October 2019, 02:58 PM   #1649
73 and a 3rd is offline 73 and a 3rd  United States
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Quote:
Originally Posted by Jason View Post
Last month it was with a designer who had an urgent family matter to attend to. I will follow up...

Thanks!
I have been wondering this too.
I am about 90% done with my build in an old DVD chassis that has been cut up, smashed and tweeked as a temporary solution. Its pretty Franken-ugly!
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Old 9th October 2019, 04:43 PM   #1650
barryso is offline barryso  United States
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Quote:
Originally Posted by 73 and a 3rd View Post
Thanks!
I have been wondering this too.
I am about 90% done with my build in an old DVD chassis that has been cut up, smashed and tweeked as a temporary solution. Its pretty Franken-ugly!
My temporary "chassis" is a piece of wood as a base and cardboard on the back to hold the rca jacks. It was cute for about a month ... but it's been about 9 months now.

Put me down for an official chassis, please!
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