"WHAMMY" Pass DIY headphone amp guide

[Zen Mod]

Fair enough. Would there be any detriment to a switch, if used while WHAMMY is powered on?

naah ......

 

[RJHarker]

Compensation caps for AD823?

 

[laverda]

What is the opinion on using the WHAMMY as a preamp for e.g. a firstwatt or ACA? How easy would it be (for a beginner) to implement something that would let it switch between headphone and RCA outputs (for power am)?

The WHAMMY used as pre-amp is stunningly good. I have one partnered with a F5t ...very nice.

 

[wayne]

It does make a pretty good pre-amp and will certainly drive cables easy enough.

 

[silasmellor]

Sounds good, I’ve got another board on the way so I might try to build one with that purpose. Thanks for the encouragement

 

[RJHarker]

read the datasheets, got it

 

[RJHarker]

*edit
Also, thanks for what you do Wayne!

 

[moe29]

Felt like i needed to post a big thank you to 6L6 for such a great write up - this project is
so very easy to recommend to any DIY friend!

After a few weeks of listening i have to say the one thing that stands out to me about this amp is
that it has a real "punchy" sound. Driving headphones with ease and delivering the goods
with excellent sound quality. "Effortless" seems to be a good adjective too

Proud to call diyAudio home - y'all rock!

 

[Zen Mod]

....... excellent sound quality.........

....... can't expect less from a man sitting here :

 

[wayne]

Where are the Orion slave girls?

 

[Zen Mod]

with Denny Craine , where else ?

 

[RJHarker]

Don't worry, I tested it by placing opamps in it backwards.

 

[mourip]

Hammond 1455T2201 available in clear, black, blue and red. They are about $32 US.

I looked up the Hammond 1455T2201 on Mouser and it listed a height of just 1".

Is it really that low?

Thanks!

 

[Dennis Hui]

It's 2.03" according to this: 1455T2201 - Hammond Mfg.

 

[mourip]

It's 2.03" according to this: 1455T2201 - Hammond Mfg.

My bad. The way Mouser had it printed I misread it...or I just need more coffee.

Thanks.

 

[wayne]

Does it work with a new opamp in c orrectly? The output stage should protect itself and the resistance on the supply the opamp.

 

[silasmellor]

How about using this power supply as a stand-alone for other preamp/headphone amp duties? I noticed Nisbeth had made his own separate psu boards in the original thread. Could be adapted from 15/17 v (stock), to 18/20 with 18V regs (Nisbeths suggestion). Any reason we couldn’t go all the way to 24V with lm7924 and possibly different transformers? Would the noise be as low at higher voltages, say for something like a ba3-fe? Seems like a very nice psu that would be cool to have as a more general purpose one also...

 

[6L6]

The PSU is excellent and would be well-suited to other projects. PSU noise increasing as voltage increases would be negligible.

 

[jwjarch]

Regarding the PSU, I have my Whammy complete now. The linear regulators and heat sinks get a little hot. I can't put my finger on them for more than a few seconds. My voltages all measure within spec at 16.9 volts + and - when I just had the PSU components installed. Once I had everything soldered up I measured almost 27 volts at the transformer secondaries. I used a Talema 22v, 25va transformer. Just wondering if the regulators getting that warm is normal. The amp itself sounds great, although I have yet to try it with a good pair of headphones. I have a pair of Thinksound ON2's on the way from massdrop.

 

[Zen Mod]

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