Oddfelow Effects - Caveman Overdrive  [traced]

General documentation, gut shot, schematic links, ongoing circuit tracing, deep thoughts ... all about boutique stompboxes.
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jreeves47
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Post by jreeves47 »

flavor of the month at the polishers forum
pic from ebay
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jubal81
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Post by jubal81 »

Funny. Id've sworn from listening to the demos that it would have been 4049-based.

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Post by FiveseveN »

Maybe it's a 4049 cut in half! [smilie=a_jester.gif]
No close-up yet?
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Lawnchair
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Post by Lawnchair »

The descriptions posted on TGP remind me of the CJOD. No idea of the topology.

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gtrplaya101
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Post by gtrplaya101 »

Heres another close up: (Photo not mine)
Caveman003_zpsc326411a.jpg
I'm seeing tl072??
single clipping diode
dual transistors
humm

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mmolteratx
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Post by mmolteratx »

FET clipping in the feedback loop. It's a boring op amp clipper with basic frequency shaping. Maybe Zen Drive ish. Not worth tracing, IMO.

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Manfred
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Post by Manfred »

mmolteratx wrote:FET clipping in the feedback loop. It's a boring op amp clipper with basic frequency shaping. Maybe Zen Drive ish. Not worth tracing, IMO.
I agree with you.

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DrBoogey
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Post by DrBoogey »

Hi guys

I looked inside one and I saw two 2N7000 and one TL082, that reminds me of something :scratch:
Drive :D

Cheers

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mirosol
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Post by mirosol »

Manfred wrote:
mmolteratx wrote:FET clipping in the feedback loop. It's a boring op amp clipper with basic frequency shaping. Maybe Zen Drive ish. Not worth tracing, IMO.
I agree with you.
Nothing is not worth tracing. In fact, more of a ripoff, more important that it is traced.
+m
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DrBoogey
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Post by DrBoogey »

I traced a unit from a collegue and my guess was right, its a slightly modded Fulltone OCD
I have drawn the changes in the OCD schematic I found in the net
The Diode is not a 1N34 or other germanium, maybe a shottky diode
I breadboarded the circuit and compared with the original unit, it sounds absolutly the same as the original Caveman Drive (differences: I used a TL072 and a BAT85 for the diode)

Cheers
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OddCD.jpg

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mirosol
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Post by mirosol »

This is exactly what meant with my comment above. I think it's important that we uncover blatant ripoffs that result in disinformation and well, crap like this:
http://ztalk.proboards.com/thread/60746 ... -overdrive

Quote: "This sounds like an awesome pedal. And, also sounds like an original design. I wonder if this pedal will achieve the same street cred as the Timmy. I'm hoping yes - because I love the idea of people coming up with original designs and becoming successful with them. The question is . . . how long will the $132 price tag last?"

No. I don't want to see anyone becoming successful with changing couple of resistor and cap values in existing design. Seems like the price tag got a bit questionable a few moments ago, when DrBoogey posted his trace.
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Post by IvIark »

DrBoogey wrote:I traced a unit from a collegue and my guess was right, its a slightly modded Fulltone OCD
I have drawn the changes in the OCD schematic I found in the net
The Diode is not a 1N34 or other germanium, maybe a shottky diode
I breadboarded the circuit and compared with the original unit, it sounds absolutly the same as the original Caveman Drive (differences: I used a TL072 and a BAT85 for the diode)
Cool. How is the Boost switch wired in the original? I can see in the gutshots that two poles are used but by the schematic you could obviously do that with one pole.
"If anyone is a 'genius' for putting jacks in such a pedal in the only spot where they could physically fit, then I assume I too am a genius for correctly inserting my legs into my pants this morning." - candletears7 - TGP

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mirosol
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Post by mirosol »

I believe the other pole is for the "Boost" indicator LED.
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Post by IvIark »

mirosol wrote:I believe the other pole is for the "Boost" indicator LED.
Ha ha, aah right, I didn't realise it has an indicator. Should have been bloody obvious really

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Post by DrBoogey »

IvIark wrote:
mirosol wrote:I believe the other pole is for the "Boost" indicator LED.
Ha ha, aah right, I didn't realise it has an indicator. Should have been bloody obvious really
Yes, its the LED indicator :wink:

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Post by IvIark »

This should cover it

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mmolteratx
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Post by mmolteratx »

Here's a redraw of the schem with a slightly less retarded boost control. Might do up a PCB later today.
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Caveman Drive.png

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Post by mmolteratx »

Did this pretty quick, but I looked over it and it looks good, as long as the schematic is good. Uploaded to OSH Park. I don't guarantee that it works, but it's very likely that it does. Might be up to organize a group buy after it's verified and if there's enough interest. Will fit in a 125B for sure with battery and everything. Might even fit in a 1590B with a bit of ingenuity. Plus it doesn't look like a monkey designed it.

https://oshpark.com/shared_projects/uhVgxqEH

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Post by mmolteratx »

PCB above is verified.

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Post by zedsnotdead »

Hi guys, sorry for the necro-post.

I built this thing some days ago, and I'd like to share with you some thoughts.

Here it is, built on mmolteratx OSHpark PCB (excelent work, thanks a lot! :D there's only just one thing - please check note @ end of post):
11666171_1012943032072043_3926986634665265484_n.jpg
Now a few notes regarding the sound.
1- I compared it vs OCD. Caveman seem a little darker sounding, but tweaking the tone control they sound almost identical.
2- I used a B100K pot for boost control. Only at around 80% CW you start to notice a "boost on/off" difference. Lower than that rotation it doesn't do much for boosting the signal. What I mean is if you have the boost pot @ 50% and step on the "boost" footswitch you will hear almost no difference in volume. You only get it significantly above 80%.

So what I was wondering is:
a) how do I make it less dark sounding? Should I change the tone cap? Should I change the pF cap on the feedback? Both??
b) do you think that using a B50K pot for boost control could give a better "range spread" for it?

Thanks!!


@mmolteratx
Boost pot/trimmer connections are backward. 1 is 3, and vice versa :)

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