Which IC in the Armstrong Twin?

red C · **Posted:** Wed Aug 01, 2007 1:11 pm

Hey All;
I'm looking to maybe built the Twin and source the couple of parts that I don't already have. While checking the parts list/build pdf on the Twin, I did not see any IC listed. I also checked the schematic. Will a rc4558 work? I have a few in the 'screamer' parts drawer.

Any idea when the PC board might be available for the Twin
Red

Stephen · **Posted:** Wed Aug 01, 2007 2:08 pm

The Twin uses a 4558 op-amp

red C · **Posted:** Wed Aug 01, 2007 6:35 pm

Stephen
Thank you sir!
Red

byoc · **Posted:** Fri Aug 03, 2007 9:54 am

damnit! instructions updated. Thanks for catching that Red. Unfortunately I don't have any atwin boards for sale. I do have a lot of blem boards that have a really easy fix on them though.

TrevorOfDoom · **Joined:** Fri May 12, 2006 10:58 am **Posts:** 197

Stephen wrote:

The Twin uses a 4558 op-amp

that said, i assume we can sub op-amps like we do with the screamer? anyone done this yet?

SugarBear · **Posted:** Mon Aug 20, 2007 11:13 pm

yes, you should be able to trade out just about any dual opamp. While it would have an effect on the signal, I can't say it how much. It'll be something I'll play with when I get my kit.

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Which IC in the Armstrong Twin?

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