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"WHAMMY" Pass DIY headphone amp guide
"WHAMMY" Pass DIY headphone amp guide
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Old 1st October 2019, 11:05 AM   #1631
emacs is offline emacs
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i ordered some components for modification.
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6 different Opamp which included AD823

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2 type of output transistor. 2013+313 was matched

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RIFA PHE450 MKP 224 0.22UF 630V VS WIMA 0.22uF 300v
WIMA 1UF/100V MKS4 VS ERO MKT 250V 105 1UF
i dont know the 0.22uf and 1uf which type is better.

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Here is a big question, i ordered 3 types of 220uf, but nichicon and SIC SAFCO are too big for installation, only Panasonic FC 220uf is suitable for this board.
Nichicon BP 220uf/50V got the ESR is 0.1324r @120Hz
SIC SAFCO 220uf/100V got the ESR is 0.148r @120Hz, bur the true value is 280uF, is it OK for use ?
May i know where should i install nichicon BP or SIC SAFCO is better as i can't install all of this on the board.

Last edited by emacs; 1st October 2019 at 11:10 AM.
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Old 1st October 2019, 11:41 PM   #1632
6L6 is offline 6L6  United States
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"WHAMMY" Pass DIY headphone amp guide
I don’t think there’s a much better electrolytic made than the FC. All the factory Pass Labs products are filled with them.
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Old 2nd October 2019, 08:05 AM   #1633
chede is offline chede  Germany
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"WHAMMY" Pass DIY headphone amp guide
+ 1

The Panasonic FC are my standard go-to electrolytic capacitors for a few years now. Have always been very happy with their performance.

Best regards, Claas
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Old 2nd October 2019, 02:12 PM   #1634
emacs is offline emacs
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Thx 6L6 and chede solved my question. I will use FC in my board.

The 3300uf/50V i will use NipponChem KY series. I tested this cap then got the size is 3200uf and ESR is 0.0424R, the result is good.
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Old 3rd October 2019, 01:38 PM   #1635
UltimateX86 is online now UltimateX86  France
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hello,
when you measure the distortion of a headphone amp, what are you using as a load and under which voltage?
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Old 3rd October 2019, 03:11 PM   #1636
ashleytt is offline ashleytt  Canada
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Hi there. I'd like to know how to calculate the power outputs (mW) of Whammy to the phones I'm using: 14ohms, 46ohms, 250ohms and 300ohms. I'm using the default 17v rails and 60mA bias. TIA!
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Old 3rd October 2019, 03:32 PM   #1637
rich1051414 is offline rich1051414
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Quote:
Originally Posted by ashleytt View Post
Hi there. I'd like to know how to calculate the power outputs (mW) of Whammy to the phones I'm using: 14ohms, 46ohms, 250ohms and 300ohms. I'm using the default 17v rails and 60mA bias. TIA!
Power = Voltage * Current
Current = Voltage / Resistance
Therefore
Power(in watts) = Voltage^2 / Resistance
The typical max volume level is 2v, and going off that:

2v^2 / 14ohms = 286mW
2v^2 / 46 = 143mW
2v^2 / 250 = 16mW
2v^2 / 300 = 14mW
That would be peak, not RMS. Divide by the square root of 2 to get an approximation of the RMS, if that is what you want.

From what I understand, the 17v rail is mostly for the op amp, to allow it to swing further, to keep the output from dropping lower than the input without clipping.

Last edited by rich1051414; 3rd October 2019 at 03:43 PM.
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Old 3rd October 2019, 07:35 PM   #1638
wayne is offline wayne  United States
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"WHAMMY" Pass DIY headphone amp guide
I tested it into 32 Ohms and it is about 400 mW at low distortion. This will hurt your ears! It is capable of more than a watt into lower impedance loads.
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Old 3rd October 2019, 10:03 PM   #1639
JamieMcC is offline JamieMcC  United Kingdom
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fwiw I spent an enjoyable couple of hours with the Whammy driving my 12" 100db 8 Ohm open baffle drivers and while they do benefit from a bit more oomph it was still very much an enjoyable listen with a clean & detailed presentation. The Whammy didn't seem to be stressed the heat sinks were no warmer than normal and the transformer (22v) stayed cool to the touch during that time.

Normally I use a 2W Set amp.
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Old 4th October 2019, 01:00 PM   #1640
ashleytt is offline ashleytt  Canada
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Thanks everyone! I won't be listening to high volume. Just want to have a sense of how the music I"m hearing related to the power outputs of the amp.
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