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20W Class-A Amplifier Power Supply PCB [01105074] Power supply circuit board for the 20W Class A Amplifier. This is the revised version with provision for chokes to reduce transformer buzz, as described in the April 2011 issue. However they can be replaced with wire links if they are not needed. Thus the board replaces the original which was coded 01105073 and was approximately the same size. Double-sided PCB with plated through holes, solder mask and silkscreen overlay. 157 x 73mm. Cat No SC3083. Price: AUD $20.00 1  Add to trolley In stock: yes (23 available). Estimated dispatch time: 1-3 days Related to: Project: A 20W Class-A Amplifier Module (May 2007 [print issue] [online issue]) Project: 20W Class-A Amplifier Module; Pt.2 (June 2007 [print issue] [online issue]) Project: 20W Class-A Amplifier Module; Pt.3 (July 2007 [print issue] [online issue]) Project: 20W Class-A Amplifier Module; Pt.4 (August 2007 [print issue] [online issue]) Project: Building The 20W Stereo Class-A Amplifier; Pt.5 (September 2007 [print issue] [online issue]) Project: Fixing Transformer Buzz In The Class-A Amplifier (April 2011 [print issue] [online issue]) View 10 other items relevant to the same project(s)