Just a little weener

[madbean]

wicked,  awesome work Brian do you have a schematic handy please?  

I would love to breadboard this and see what the fuss is about cheers  

Sure. I'm not positive that the SAG control will be included. I realized after testing my build out that I was actually running it at 6.3v (it was hooked into an LM317) and it sounded awesome. I'm going to do so more tests tomorrow to decide if there is any benefit to lower voltages or not. Everything else is for sure.

[jstbrowsin]

nice, thanks Brian.
Just out of curiosity are the transistor choices because that's just what you had handy? I'm only asking because Q1 is a 2N3565, google says 2N3904 replacement but I'm not so sure cause there seems to be quite a bit of difference between the 2 specs. What spec (hfe, current gain, impedance etc) should I be looking at specifically to identify the ideal replacement please?     
TIA

[Haberdasher]

another great project!
Will this layout have pads for radial caps as well, or should I commence to orderin axials?

[jkokura]

nice, thanks Brian.
Just out of curiosity are the transistor choices because that's just what you had handy? I'm only asking because Q1 is a 2N3565, google says 2N3904 replacement but I'm not so sure cause there seems to be quite a bit of difference between the 2 specs. What spec (hfe, current gain, impedance etc) should I be looking at specifically to identify the ideal replacement please?     
TIA

You could just get a 2N3565 from Smalbear...

Jacob

[timbo_93631]

very cool. first I've heard of the whipple inductor. Does anybody sell TDK-alikes?

I have modded a dozen or so Vox V847's with Whipple inductors and can say that they are really good.  The guy that makes them is really great to deal with too.  if you look at smallbear they have a variety of inductors too, but no TDK clones are out there to my knowledge.  Sometimes you see a TDK in a fasel style package that has been pulled from an organ on ebay.

[saxoftenest]

YES!!!! Cannot wait for this one...

[cjkbug]

the "stack of dimes" inductors that small bear sells sound fantastic as well.

[madbean]

nice, thanks Brian.
Just out of curiosity are the transistor choices because that's just what you had handy? I'm only asking because Q1 is a 2N3565, google says 2N3904 replacement but I'm not so sure cause there seems to be quite a bit of difference between the 2 specs. What spec (hfe, current gain, impedance etc) should I be looking at specifically to identify the ideal replacement please?     
TIA

You could just get a 2N3565 from Smalbear...

Jacob

I indicated 2n3565 simply because it is what I used and my preference for medium gain transistors (part aesthetics, too which you will see when I post my build pic). You can certainly use a 2n3904 in its place. While I haven't compared the datasheets, they both fall into the ~300 Hfe range.

[madbean]

Okay, so I'm ditching the sag control. No benefit, unless you really love lower output.

The only change will be the suggestion of a socket for the Q1 emitter resistor. Lowering it gives you more volume and gain, if you want it. I settled on 150R. You can go as far as grounding the pin, if you want.

So, just got grease up the treadle tomorrow and it should be good to go.

[JakeFuzz]

So does that output buffer mean it will play nice with my Fuzz Faces? So incredibly ready for this thing!

[madbean]

So does that output buffer mean it will play nice with my Fuzz Faces? So incredibly ready for this thing!

Maybe not all fuzzes. Fortunately, it is easy to bypass and the doc will have instructions on how to do that with a switch.

[madbean]

After looking at some shell specs, I realized that the mounting hole arrangement was not too great on the previous layout. So, I went ahead and revised it to fit the three most common mounting areas in the Crybaby. It actually is a bit better layout in some ways.

Couple small changes to the schem and I went ahead and added the pads for a buffer bypass instead of some kind of kludge....just cleaner this way.

[sgmezei]

This is looking great Brian! I am not sure about the Halo inductor pinout from Small Bear but I think I might use that one. Will there be pads for it? If not, I shall rig something up, or just get the whipple.

[madbean]

Pin spacing on these inductors is a bit hard to come by. I did the Whipple directly from mine, and the Fasel is about 12.5mm. Unfortunately, Steve doesn't seem to provide pin spacing on the other inductors he has.

If anyone has specs on other inductors, please feel free to pass it along and I will do my best to include them.

[madbean]

Here is the final build. Note all my mounting hackery from poor planning (I have since fixed the mounting hole positions). Sound is great....very WAAAHHH. I'm going to tweak the emitter resistor of Q1 a little more and play with the peak trimmer, but everything works and sounds as it should. I opted not to have a bypass for the output buffer on this one. Most likely I will build a couple of these in the future.

Video demo coming ASAP.