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"WHAMMY" Pass DIY headphone amp guide
"WHAMMY" Pass DIY headphone amp guide
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Old Yesterday, 12:18 PM   #1501
labjr is offline labjr  United States
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Quote:
Originally Posted by ernesternest View Post
Labjr, the airspeed choosen for this work, is it in the low or higher speed range?
It varies by the job and the nozzle I'm using but I'm impatient so usually on the higher side. I have a relatively inexpensive hot air station. I wouldn't mind having a better one.
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Old Yesterday, 09:11 PM   #1502
Gaz2613 is offline Gaz2613  United Kingdom
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Best way to make rolling op amps easier on the Whammy is to use an IC socket tower.
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Old Yesterday, 09:27 PM   #1503
AudioSan is offline AudioSan  Norway
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those sinks looks scary close to the top lid when the outputs are not electrically isolated from the sinks.
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Old Yesterday, 09:55 PM   #1504
Gaz2613 is offline Gaz2613  United Kingdom
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Quote:
Originally Posted by AudioSan View Post
those sinks looks scary close to the top lid when the outputs are not electrically isolated from the sinks.
I used everything in the BOM including the listed chassis and sinks. There is a few mil clearance between the top cover and the top of the sinks so they dont touch I did check that when doing the initial build.
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Old Yesterday, 11:33 PM   #1505
avdesignguru is offline avdesignguru  United States
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Default Whammy build

Thought I would share my Whammy build. I have built more than a half dozen projects in the DIY store enclosures so I thought I would give the original spec Hammond enclosure a try. Since I wanted a filtered input socket as well as output jacks, layout was tight on the rear panel. I ended up with the right RCA output jack a bit close to the socket.

I really wanted the front panel volume control to be centered vertically, so I chose a 50K audio ALPS RK16 (physically mid-sized between the RK09 and the original spec RK27) and added some leads to get it off the PCB. The shaft damping on the RK16 is not quite as smooth and viscous as the RK27 or even the RK09 but still acceptable. An RK09 with a 99 cent EBay PC adapter board probably would fit.

Add in a front panel power switch, LED and HP jack and the front panel layout pretty much dictates itself. I find the front panel a bit thin. It flexes when removing the headphone plug. The only other mods to the standard build with LED voltage reg control were the Wurth input caps (1/3 the cost of the Vishay caps). I bought both the RC4580 and the LM833 input opamps and have only listened to the RC4580 so far.

My two other HP amps are Pete Millett's NuHybrid and Mark Johnson's T2, both of which have SMPS regulated supplies. All 3 sound different. Not earth shaking but with discernible differences.

Wayne's amp is the most well behaved circuit of the 3. Dead quiet, no turn on or turn off noises, gobs of gain. If there are any drawbacks for me, it is that the bass seems a bit soft compared to the other two, perhaps that is a characteristic of the power supply, maybe the opamp.

The other thing is that the Whammy sound character is pretty obviously driven by the choice of the front end opamp. Mark's T2 beats the Whammy in that respect in that the T2 really doesn't have much of a front end. Also, not enough gain to adequately drive low sensitivity planar magnetic headphones.

So, my initial response is, the Whammy is very quiet, has good gain, is very detailed and would make a good studio monitoring headphone amp but it is not as exciting as either the NuHybrid or even the T2. The NuHybrid ended up the most costly of the 3 because I found I prefer listening to the source in its original polarity, which required some expensive Jensen input transformers, reversed to compensate for the triode circuit inversion inherent in the design.

For a first time builder, I would recommend Mark's T2. Easier to build, less expensive, and more fun to listen to, as long as you don't need a ton of gain.
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Builds: F6, B1, B1-Korg, LXmini ACN, MoFo, T2 HPA, NuTube Buffer, NuHybrid HPA, NuClassD Amp, Aikido Preamp; In-progress: Whammy HPA, M2X Amp

Last edited by avdesignguru; Yesterday at 11:48 PM.
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Old Today, 01:03 PM   #1506
stormfrontier is offline stormfrontier  United States
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Quote:
Originally Posted by AudioSan View Post
those sinks looks scary close to the top lid when the outputs are not electrically isolated from the sinks.
I recommend the use of die-cut mica insulator pads with thermal paste on both sides. In my amp, I can flex the top plate enough to touch the sinks!
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Old Today, 01:18 PM   #1507
Mark Johnson is offline Mark Johnson  United States
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"WHAMMY" Pass DIY headphone amp guide
For the sub-2-watt applications inside WHAMMY, Bergquist Sil-Pad insulators are perfectly fine. They're cheap, they speed up assembly, and they don't create a sticky goopy mess.

https://www.digikey.com/products/en?...K4-0.006-00-58

SPK4-0.006-00-58 Bergquist Company | Mouser
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