Rothwell Switchblade

cpm · Post by **cpm** » 18 Nov 2012, 21:35

I had this box on the bench. The Rothwell Switchblade actually sounded nice, although a bit too bassy on the eq for my tase.

The problem with this is that its kind of microphonic, a lot of gain and some supect smd electrolytics, and that its mounted soldered to the 3pdt, amplifying noises on the switch and tapping the box...

I couldnt get the values on the SMD caps, I dont have a capable meter...

mirosol · Post by **mirosol** » 28 May 2014, 00:15

Interesting design. Here are my guesses for the non-polar caps:
C1 - 100n
C2 - 100n
C4 - 47n
C6 - 100n
C8 - 47n
C9 - 1n
C10 - 1n
C13 - I guess that should be fine with 1n.

I drew a layout with those, but if anyone has an idea of the correct values... Let me know. Layout is currently unverified.

mirosol · Post by **mirosol** » 01 Jun 2014, 20:27

Layout works, but my guesses on the values aren't exactly spot on.. Anyone have better guesses?

mmolteratx · Post by **mmolteratx** » 25 Jun 2014, 03:00

mirosol wrote:Layout works, but my guesses on the values aren't exactly spot on.. Anyone have better guesses?

Try

C1 - 100n
C2 - 220n
C4 - 1n
C6 - 470n or maybe even 1µ
C8 - 1n
C9 - 220n or 470n
C10 - 100p or 220p

mirosol · Post by **mirosol** » 25 Jun 2014, 06:39

Thanks mmolteratx. Some of those do look more reasonable. I'll be updating the layout soonish...

mirosol · Post by **mirosol** » 26 Jun 2014, 18:57

Values do make a bit more sense now...

mirosol · Post by **mirosol** » 02 Jul 2014, 21:35

mmolteratx wrote:
mirosol wrote:Layout works, but my guesses on the values aren't exactly spot on.. Anyone have better guesses?
Try

C1 - 100n
C2 - 220n
C4 - 1n
C6 - 470n or maybe even 1µ
C8 - 1n
C9 - 220n or 470n
C10 - 100p or 220p

Nope. Just oscillation with those values. Anyone has the unit and a capable meter? I'd be grateful for inaccurate readings too...

Rothwell Switchblade [traced]