I just love Electro-Harmonix phasers such as the Small Stone or the Electric Mistress..
I found these schematics to build a Small Stone replica using the CA3080 Operational Transconductance Amplifiers:
http://www.tonepad.com/project.asp?id=11
The build on a breadboard looks like this:
And the sound is great, here’s a demo using a great song by Adrian Nation, Five Fingers Rapid:
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