Tycobrahe Octavia opamp remix

[moonTV]

Hi all,

Newbie tinkerer here. I was playing around with the tycobrahe Octavia on the breadboard and decided to involve a dual op amp I had lying around.

A non inverting buffer and a non inverting gain stage with a variable gain going from 1 to 50.

No problems buffering the input and adding a clean blend after the rectification stage.

Also able to drive the rectification via the op amp without any problems that I can see.

Where I'm having problems is this: I want the op-amp driven rectification stage to drive the transistor-based fuzz stage. It oscillates, acts all crazy; there must be something glaringly obvious but I'm new and haven't figured it out yet.

A nudge in the right direction is all I ask.

Thanks

 

[dogears]

Ha, that transistor gain stage is a Helios

 

[EthanSpaulding]

I'm unclear how the op-amp is driving which transistor, but you might want to install a series resistor between op-amp output and any transistors base.

 

[abbey road d enfer]

A nudge in the right direction is all I ask.

A schematic with your actual implementation is all I ask...