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New PassDIY Headphone Amp (now available)
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Old 13th April 2018, 02:53 AM   #1081
Frazzled is offline Frazzled  Canada
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WOO HOO just purchased 2.
Thank you!
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Old 13th April 2018, 07:12 PM   #1082
wayne is offline wayne  United States
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Thanks 6L6 for all your work on this. My gets used quite often.
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Old 14th April 2018, 10:42 AM   #1083
osscar is offline osscar  Latvia
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Quote:
Originally Posted by 6L6 View Post
Osscar - Wonderful! A beautiful construction!

Looking forward to hearing news of it's operation. Post more photos if you have them
Whammy is finally finished!
I turned to the dark side (with a blue LED of course):

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internal part( There was a small hum on the left channel from the transformer - I made a mu-metal shield)

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sounds very good, the bottom end is very fast!
Bias 100mA, Irfs, BB OPA 2604 (original), all 22uf non-polar+film caps.Rails: +-17V. heat sinks - 55 Celsius. offset - 1mV and 0,1mV
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My DIY so far: two Leach amps, Pass AB100, Pass F5, B1 buffer, Hiraga le monstre, two LM3875, LM1875, OPA549, 6C33C SE, GU32 PP, 6p3c-e PP, Marsh headphone amp.Phono - OBH-8se, Pacific RIAA, inDiscreet Phono, Whammy headphone amp.
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Old 14th April 2018, 01:08 PM   #1084
6L6 is offline 6L6  United States
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Beautiful! Thanks for the photos!

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Old 14th April 2018, 02:08 PM   #1085
osscar is offline osscar  Latvia
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Thank you and others who are involved and made this project available to everyone.
I like the optocoupler bias circuit - no adjustments, it works from the first start !
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My DIY so far: two Leach amps, Pass AB100, Pass F5, B1 buffer, Hiraga le monstre, two LM3875, LM1875, OPA549, 6C33C SE, GU32 PP, 6p3c-e PP, Marsh headphone amp.Phono - OBH-8se, Pacific RIAA, inDiscreet Phono, Whammy headphone amp.
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Old 14th April 2018, 03:12 PM   #1086
WalterW is offline WalterW  Netherlands
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New PassDIY Headphone Amp (now available)
Wow! Nice work Osscar. Nice PCB's and chassis.
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Old 14th April 2018, 03:22 PM   #1087
osscar is offline osscar  Latvia
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thank you, they are not as perfect as industrially produced, but it's DIY after all. (I decided at last to put parallel resistors in PSU CRC to reduce dissipation ..resistors are not parallel in - there was no pads for that )
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My DIY so far: two Leach amps, Pass AB100, Pass F5, B1 buffer, Hiraga le monstre, two LM3875, LM1875, OPA549, 6C33C SE, GU32 PP, 6p3c-e PP, Marsh headphone amp.Phono - OBH-8se, Pacific RIAA, inDiscreet Phono, Whammy headphone amp.
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Old 27th April 2018, 06:54 AM   #1088
pelayostyle is offline pelayostyle  United States
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In the planning stages for this build and I really want to use an AD8620 I have laying around. Specs show max dual-supply voltage at 13V. It looks like its R35 and R36 need to be changed to drop the voltage a bit but not sure what values to try. Can anyone help? Thanks!

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Old 27th April 2018, 06:12 PM   #1089
wayne is offline wayne  United States
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You could use a 15 volt transformer and 12 Volt regulators.
If you use 15 Volt regulators the resistors would need to be about 330 Ohms and I don't know if that is the best idea.
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Old 12th May 2018, 11:48 PM   #1090
nzlowie is offline nzlowie  Australia
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I've been looking for a really nice sound ding low power amp to drive my horn's, could I use something like this or would this struggle to drive 8 ohms?

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