Blackout Effectors Sibling Phaser Guts from website

[Visualdistortion]

I found this pictures of this great phaser:
Got NE5517N inside.

[Stray]

Oh, that's nice. You took them from my blog.

[OnTheTundra]

Oh, that's nice. You took them from my blog.

Do I detect some sass?

[Scruffie]

If we take the Small Stone/Whetstone as a base, 2 transistors make up the small stone audio path, one transistor makes up the output boost.

That leaves us with 4 OTAs (2 Duals) and 4 Transistors which means, either there is 4 swept OTA Phase stages and an LFO made from 4 transistors OR there are 3 swept OTA stages and one OTA along with a pair of transistors makes up a copy of the small stone LFO and 2 transistors form a fixed phase stage.

That would be my guess and from the proximity of one of the transistor pairs I would assume they are forming a discrete darlington and therefore it is the 3 swept stage version I proposed.

[Tall Steve]

I count 7 transistors: 2 on the far left, 3 in the middle, and 2 on the far right. Judging by the Small Stone, the pair on the left is a PNP Darlington connected to the LFO. The pair on the right is the Sziklai buffer at the input. Since the 'Level' pot is right next to the pair in the middle, it's probably a summing amp. That leaves the single Q as the output buffer. The proximity of the OTA to the Sziklai suggests that it's next in the chain. If that's the case, then it has to be a swept stage. I'll have to check out some clips after I get out of class. If it is only a three-stager, that's an interesting configuration .

FWIW, here's the Small Stone schematic I used for reference: http://www.montagar.com/~patj/smlstone.gif