Which explains the cause of the heating.. In the application where I run an AD826 it has a +- 12V supply-rails in which case it hardly runs hot.
But I'm not sure if +- 12V Rails will be sufficient for the Whammy.
I have headphones that get really loud (damage your hearing loud) on a phone or iPod, and that's typically an output swing of 1.5vRMS, or 4.2v peak-peak.
Even with "small" 12v rails this circuit will still swing almost the entire rails into the load, or 24v Pk-Pk, (8.4vRMS) and enough current capability for any headphone you can attach to it... I'm sure it's going to be sufficient
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I have headphones that get really loud on a phone or iPod, and that's typically an output swing of 1.5vRMS, or 4.2v peak-peak.
Even with "small" 12v rails this circuit will still swing almost the entire rails into the load, or 24v Pk-Pk, (8.4vRMS) and enough current capability for any headphone you can attach to it... I'm sure it's going to be sufficient
Thanks, 6L6
So here is my build:
Pretty much everything was from the official BOM except for the:
- O type transformer;
- old stock oil capacitors;
- Sennheiser HD600 headphone & A-T M50X headphone.
- Tokyo Koen CP601 pot.
So far I have tried 3 op amps: AD826, RC4580, and LM4562.
I got AD847 and Opa134, I am waiting for the 2 into 1 adaptors.
The RC4580 has very good mid and hi SQ; although the bass is a bit muddy.
The "hot" AD826 is quite a good overall performer-bass is clean and solid and I can hear more details; mid and hi are as good as RC4580.
LM4562 is by far my favourite. SQ may not be as analytical/detailed as AD826 but very smooth and fluid, analogue and comfortable feel; no hearing fatigue after 3 hours of use!
The most expensive op amp I ever bought was the ADA4627(SMD) and one of them has extreme popping noise. I feared my solder gun was too hot and destroyed it...
When some more adaptors come, I will transfer them to a new board and check again. I hope I did not kill it. It cost quite a bit.
And the Whammy amp drives my Sennheiser headphone beautifully; but not too good with my M50X. Of course HD600 cost twice as much.
more subjective & biased listening experience with other op amps to come
Pretty much everything was from the official BOM except for the:
- O type transformer;
- old stock oil capacitors;
- Sennheiser HD600 headphone & A-T M50X headphone.
- Tokyo Koen CP601 pot.
So far I have tried 3 op amps: AD826, RC4580, and LM4562.
I got AD847 and Opa134, I am waiting for the 2 into 1 adaptors.
The RC4580 has very good mid and hi SQ; although the bass is a bit muddy.
The "hot" AD826 is quite a good overall performer-bass is clean and solid and I can hear more details; mid and hi are as good as RC4580.
LM4562 is by far my favourite. SQ may not be as analytical/detailed as AD826 but very smooth and fluid, analogue and comfortable feel; no hearing fatigue after 3 hours of use!
The most expensive op amp I ever bought was the ADA4627(SMD) and one of them has extreme popping noise. I feared my solder gun was too hot and destroyed it...
When some more adaptors come, I will transfer them to a new board and check again. I hope I did not kill it. It cost quite a bit.
And the Whammy amp drives my Sennheiser headphone beautifully; but not too good with my M50X. Of course HD600 cost twice as much.
more subjective & biased listening experience with other op amps to come
Attachments
Yeah...having tried many single op-amps over the years, IMO the ADA4627-1 is one of the best sounding FET-input op-amps available regardless of cost.
It simply "mops the floor" with lesser op-amps like the OPA-134.
I have soldered many 4627-1's to different adapters without killing them from excessive heat.
I always use a small 15W soldering for doing so, though.
There is also a guide to this project available through the diyAudio Guides (beta) section of the forum. 6L6 authored. Source
From a quick look it appears more or less the same as the first posts in this thread and the way it is presented is very nice. Nice work!
Link to guide
From a quick look it appears more or less the same as the first posts in this thread and the way it is presented is very nice. Nice work!
Link to guide
Should the power supply drawing note that when using D5 and D6 (configuration 2), R10 and R14 should also be omitted along with R9 and R13? The tested voltages did not vary significantly from what was expected with R10 and R14 in the circuit. We couldn't decipher the regulator circuit based on the datasheet. Then again, we're noobs!
Thanks for a great project!
Frank and Emma
Thanks for a great project!
Frank and Emma
Regardless of what the datasheets state, the ADA4627-1 still sounds better to my ears than the '4625-1.
I've listened to both in different applications.
Sometimes "newer" with "better specs." doesn't always correlate to "better sound quality".
Of course when it comes to something as subjective as op-amps' sound quality, ymmv.
Thanks for the suggestion... I've found a type 1706 with knob, on/off switch, holes for the phones and rca entries and power inlet... and in blackMy WHAMMY is finished, thanks Wayne for this nice little amp, like it
The Breeze Audio 1706 case is a nice and cheap fit for this amp. One side of the pcb glides into the lead and you need only two spacer on the other side to fix the board.
That will save me a lot of drilling and nasty issues.
Nice job and thanks for the heads up on the 1706 enclosure ordered one from aliexpress
1706 all aluminum amplifier chassis / preamplifier case / DAC / AMP Enclosure / case / DIY box (172*60*251mm)-in Amplifier from Consumer Electronics on Aliexpress.com | Alibaba Group
1706 all aluminum amplifier chassis / preamplifier case / DAC / AMP Enclosure / case / DIY box (172*60*251mm)-in Amplifier from Consumer Electronics on Aliexpress.com | Alibaba Group
How about a battery powered whammy with a dac and some way to interface wirelessly to a mobile phone / sw player. Not looking unlike the top left/right variants in the picture. The leather strap is obviously the most important element. A modern take on the walkman.
Pic Source
