Apocalypse Audio Four Horsemen Overdrive

[anders]

A great sounding overdrive with some fuzzy germanium goodness when cranked.

Schematic

[anders]

Now verified and good to go. Sounds great and will probably be boxed. I used a russian P30 tranny for Q4 with Hfe 104 and zero leakage.

[rocket88]

bah, i didn't notice you did this one anders. i just posted a layout for it on the main page.

nice job with it, btw, really looks great. nice and neat.

[anders]

No worries! The more the merrier as they say. Your layout looks neat as well.

[SeaWitch]

Anders,

Thanks for this layout!  

If I want to do a NPN version of this build, do I just flip all the diodes and electrolytic caps?

EDIT: Looks like I don't flip ALL the diodes and caps, however I'm not exactly sure which ones to flip...

Is there anything else I need to look out for?

Thanks!

[anders]

Hey! No need to change the polarity, it's already running on normal power supply. I guess you were thinking about the PNP germanium. You can use those with normal power supply, just check out Fuzz factory or Monolith Oracle for example.

[Frank_NH]

For those who have built it, how does this circuit sound?  I couldn't find any examples online, but it seems pretty high gain from the schematic.  I even have some spare PNP germanium transistors I could use!

[SeaWitch]

Thanks!  I got a little confused there for a minute...

What do I need to do to use a NPN transistor there instead of a PNP?   I have a handful of MN38A’s that would probably sound good.  

Thanks for your help!

On Tue, Jul 23, 2019 at 9:28 AM anders [via Guitar FX Layouts] <[hidden email]> wrote:

Hey! No need to change the polarity, it's already running on normal power supply. I guess you were thinking about the PNP germanium. You can use those with normal power supply, just check out Fuzz factory or Monolith Oracle for example.

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NAML

[anders]

Yes, it's pretty high gain with gain knob dimed but the whole range is usable. Sounds tight and clear, I really like this design.
I did a new layout a while ago which isn't verified at the moment but I think I will give it a go in a couple of days. If you wan't I could possibly alter the components sorrounding Q4 so a NPN transistor could be used.

[SeaWitch]

Thanks Anders!  I was just roaming around your blog, and it looks great...amazing job!

I have some MN25B's (PNP) I can use for this Four Horsemen, but if you end up doing a layout for a NPN @ Q4, I'd probably build that one too.

Thanks again!

On 7/23/2019 3:21 PM, anders [via Guitar FX Layouts] wrote:

Yes, it's pretty high gain with gain knob dimed but the whole range is usable. Sounds tight and clear, I really like this design.
I did a new layout a while ago which isn't verified at the moment but I think I will give it a go in a couple of days. If you wan't I could possibly alter the components sorrounding Q4 so a NPN transistor could be used.

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NAML

[RNFR]

Thanks guys. I’m very proud of this one.

[SeaWitch]

Hey RNFR,

I built your 4 Horsemen as well as the Toecutter, and housed them together with the 4HM >> Toecutter.  This thing rips!

Thanks for sharing your hard work...much appreciated!  here is a photo of it:

On 10/2/2019 4:49 PM, RNFR [via Guitar FX Layouts] wrote:

Thanks guys. I’m very proud of this one.

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NAML

[RNFR]

Wow that looks awesome!