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SA156 plastic bobbin An SA156 plastic sewing machine bobbin which can be used for winding high-current air-cored inductors in the range of about 1-10µH. 6mm ID, 20mm OD, 10mm height. Preferred colour: cleartranslucent orangetranslucent pinktransulcent grey Cat No SC3432. Price: AUD $1.00 1  Add to trolley In stock: yes (53 available). Estimated dispatch time: 1-3 days Related to: Project: Ultra-LD Mk.4 200W RMS Power Amplifier: Preview (July 2015 [print issue] [online issue]) Project: Ultra-LD Mk.4 200W RMS Power Amplifier, Pt.1 (August 2015 [print issue] [online issue]) Project: Ultra-LD Mk.4 200W RMS Power Amplifier, Pt.2 (September 2015 [print issue] [online issue]) Project: Ultra-LD Mk.4 Power Amplifier, Pt.3: 110W Version (October 2015 [print issue] [online issue]) Other items relevant to these projects: Ultra-LD Mk.4 Amplifier PCB [01107151 RevC] ($15.00) Add to trolley Ultra-LD Mk3/Mk4 Amplifier Power Supply PCB [01109111] ($15.00) Add to trolley Ultra-LD Mk.4 Amplifier prototype PCB [01107151 RevB] ($2.50) Add to trolley 2 x HN3A51F + 1 x IMX8-7-F + 2 x BC846C transistors for the Ultra-LD Mk.4 Power Amplifier module ($5.00) Add to trolley Ultra-LD Mk.3 Power Supply PCB pattern (PDF download) [01109111] (Free) Add to trolley Ultra-LD Mk.4 Amplifier PCB pattern (PDF download) [01107151 RevC] (Free) Add to trolley