Calling all SMD experts!

[digi2t]

Tracing out the Spacemen Nebula, I came across these beasties on the backside of the babyboard...



The lower left legs are not connected to anything. If that helps any.

What in the heck is this???

[EBK]

ZXCT1041 bidirectional precision high-side current monitor?? (A relatively uninformed guess based on some Googling).  Are there rechargeable batteries involved?

[Groovenut]

ZXCT1041 bidirectional precision high-side current monitor?? (A relatively uninformed guess based on some Googling).  Are there rechargeable batteries involved?

I concur... that's all I could find matching as well

[digi2t]

Thanks guys!

Seems to fit the bill. It's for the Spaceman Nebula octave fuzz. What they're doing? No idea. I suppose it'll be clearer once I get the schematic drawn out.

[italianguy63]

Thanks guys!

Seems to fit the bill. It's for the Spaceman Nebula octave fuzz. What they're doing? No idea. I suppose it'll be clearer once I get the schematic drawn out.

Glad to see you back at it Dino my man!

MC

[Govmnt_Lacky]

Hey Dino!

What are those SMD parts directly connected to? An LED? A resistor?

[jubal81]

Looks like full-wave rectifier, so could very well be the source of the octave.

[digi2t]

Glad to see you back at it Dino my man!

MC

Thank you brother. I seem to have picked a mutherfooker for my first trace back.

Hey Dino!

What are those SMD parts directly connected to? An LED? A resistor?

I think they're part of the octave circuit, but I can't say for sure yet. I only have the prelim trace done, which needs to be converted to a schematic. Here's what I have for the moment...

Looks like full-wave rectifier, so could very well be the source of the octave.

That's what I was thinking. Probing the pins used with the diode tester, I do get readings somewhat like a rectifier.

[Govmnt_Lacky]

I concur with jubal... looks like those are your rectifiers 

[BetterOffShred]

I follow this with interest   

[EBK]

Could they be power MOSFETS, with extra pins primarily for thermal reasons?

[Slowpoke101]

Have a quick look at this application note.

https://www.diodes.com/assets/App-Note-Files/an55.pdf

You may be one to something with this.

[thermionix]

Why two, if one can do full wave?

[digi2t]

This is what I've come up with...



Definitely a new twist (component-wise) on octave generation.

[iefes]

That's great. Let us know when you have tested and verified it. I'm definitely interested.

[Digital Larry]

what's the ONION for at upper right?   

[diffeq]

what's the ONION for at upper right?   

Flavour? (I think  it might +1/+2 octave switch?)

[digi2t]

Type of switch... ON / ON.

Geez guys... I actually spent about a minute looking for "ONION"!! Not nice. 

That's the fuzz gain switch. Fuzz, or MORE FUZZ.

[thermionix]

what's the ONION for at upper right?   

It's only included for Spice?