Chauffeur Overdrive - caps in output

[fontoponto]

Hi fellow solder melters,

does anyone have an explanation the reason for the unusual caps in the output section and how they affect the signal?

 

[manfesto]

back to back like that in series and backwards from one another, those two polarized 100uF capacitors form a 50uF nonpolarized capacitor.

It's DC decoupling (blocking DC so that only the AC signal passes), and I think it's a little overkill (lots of circuits get by with like 1uF or less), but I also think overkill is sort of de rigueur for this circuit.

 

[fontoponto]

In another forum there is a discussion about this. Beside the decoupling the cap and the pull-down resistor are forming a high pass filter which might be useless in this case.
I was wondering if some one has more insight about why it is designed like that.

 

[manfesto]

Someone smarter than me can hopefully chime in, but I think the 1M to ground is a pull-down resistor for popping isn’t it?

 

[jesuscrisp]

A bunch of design decisions in the circuit are just stupidly redundant or overdone. But maybe the goal was exactly that.

 

[Feral Feline]

50µF + 0.47µF in series = 0.46562µF

Is there some kind of "tube-like sag" by having series capacitors "fill up"?

If not, then stick in a 470n film cap and be done with it. Yeesh.

 

[HamishR]

Probably over-stocked with 100µF caps and figures it makes his circuit look boss

 

[manfesto]

Probably over-stocked with 100µF caps and figures it makes his circuit look boss

What’s funny is that elsewhere in the circuit are similarly-overkill 47uf and 22uf electrolytics, and I’m kinda surprised those weren’t *also* 100uF for exactly that first reason