PASS DIY Headphone Amp - WHAMMY
Mar 20, 2020 at 6:14 AM Post #181 of 204

JamieMcC

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Hey all I made a few different designs based on Wayne's power supply for the whammy. The one shown is a single rail positive CRCRC filtered linear supply. This board is already in the fabrication house and I'll be fully testing when they arrive.

Screenshot_20200319-211052__01__01__01.jpg

I have also made a board based on the pilot light schematic submitted by 6L6 which allows you to easily add a pilot or power LED to the whammy or any other amp that doesn't have the provision for a power LED. Simply tap into the transformers AC output or the power supplys DC output. I made an alteration to the original circuit by adding a variable resistor to allow you to adjust the brightness of the power LED indicator for your build. These are also in the fabrication house.

Screenshot_20200319-210951__01.jpg
Those boards could prove handy for all sorts of projects. Keep us updated
Cheers
 
Mar 20, 2020 at 6:24 AM Post #182 of 204

gaz2613

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Those boards could prove handy for all sorts of projects. Keep us updated
Cheers

Will do. I'll post my other designs at some point in the next few days. :)
 
Mar 20, 2020 at 7:09 PM Post #183 of 204

gaz2613

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Here are my other designs. First up we have the traditional dual rail positive and negative power supply which can be useful for many projects:

Linear Reg-PSU-REV-A-Top.jpgLinear Reg-PSU-Bare-Board.jpg

I have modified the design from the one on the whammy where by the LEDs on the output are used to provide the regulators with an idle load and there is also provision to attach a single LED for use as a power on indicator. Other than that the design is practically the same.

The next one is very similar being dual rail but this time it provides 2x positive rails so you can build a power supply with dual outputs to power multiple devices.
Linear Reg-PSU-Dual_Pos.jpgLinear Reg-PSU-Dual_Pos-Bare-Board.jpg

You may not be able to see well in the images but there is provision for a power on LED indicator for each rail so you can easily see that both outputs are powered up.

Finally I also quickly made a board for the 15/25VA transformers so you can add to your own projects. I know these are readily available but I made mine easier to understand for wiring to either 120v or 240v depending on your country's voltage specification.

15-25VA Transformer Board.jpg15-25VA Transformer Board-Bare.jpg

If you have any more ideas then let me know. :)
 
Apr 4, 2020 at 7:11 PM Post #184 of 204

gaz2613

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Here is the single rail PSU I built. Working nicely I might add. I need 2 of these boards for testing so I have 8 available. :)

IMG_20200404_003130-1382x1843__01.jpgIMG_20200404_003138-1843x1382.jpgIMG_20200404_003208-1843x1382.jpg
 
Apr 30, 2020 at 8:00 PM Post #185 of 204

gaz2613

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Got some dual rail boards if anyone is after any? This is pretty much the PSU section of the whammy but with a couple of design changes.
PIC A.jpg
 
Jun 2, 2020 at 9:50 PM Post #189 of 204

penmarker

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The case is from AliExpress and laser engraved. The rear looks better because the laser can burn off the black anodization cleanly. The front is highlighted with some black graphite or else it wouldn't have the same contrast.

I'm not worried about the inlet connectors, just don't stuff your pokey bits into the receptacle or open it.
 
Jun 3, 2020 at 3:26 AM Post #190 of 204

Avinunca1

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I'm not worried about the inlet connectors, just don't stuff your pokey bits into the receptacle or open it.

Scenario - Dad's taken the lid off to roll some op-amps. He has been listening to LMxxx vs ADxxxx and pops to the kitchen to make coffee. Little Jimmy wonders in.........
Okay, with valve(tube) kit there's HT all over the place. With most semiconductor kit however there are only dangerous voltages up to the transformer primary.
It's so easy to make them (much) safer with a bit of sleeving. We cannot assume that any future owner will be as sensible (or sober).

Listening on my Whammy as I type..... love it.
 
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Jun 3, 2020 at 4:13 AM Post #191 of 204

penmarker

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Thanks for the input, but little Jimmy is just as likely to poke a screwdriver around until he reaches the exposed solder points behind the transformer. I'll still update the connectors once I get suitable replacement shrouded crimp connectors though just in case.
 
Jun 23, 2020 at 8:37 AM Post #192 of 204

individual6891

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The case is from AliExpress and laser engraved.

Where did you get the laser engraving done from? If local, what price for the engraving? Trying to figure out my options in UK!
 
Jul 28, 2020 at 11:04 AM Post #194 of 204

John Massaria

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Very fun build, loving the sound.
I'm letting this go if anyone is interested.

IMG_20200521_204712.jpg IMG_20200521_204515.jpg IMG_20200521_204302.jpg IMG_20200521_204100.jpg
what are you using to replace it? is it still for sale and what OPA did you use?
 
Jul 28, 2020 at 11:04 PM Post #195 of 204

penmarker

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I still have my old Lehmann Black Cube Linear clone that I use as preamp and headphone amp duty. I was mainly thinking about selling it for the cash not because I found an upgrade.
Yes still for sale, there's a Burson V5 in it and a LM4562NA that I haven't tried yet. Initially built I used the cheap opamp from the BOM, it does its job but any better opamp will sound better.
 

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