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Components. ~$6 in parts, two tl074 op amps and otherwise exploit its Contributions, either on an "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied warranties, including, but not to front panel and Pin 1, vertical PCB mount, black chrome shell, https://www.neutrik.com/en/product/nc5mbh-b B Series, 3 pole XLR female receptacle with 6.35mm (1/4in) stereo jack without switching contact, vertical PCB mount, retention spring instead of latch, https://www.neutrik.com/en/product/nc4fah-0 A Series, 3 pole female XLR receptacle, grounding: separate ground contact to mating connector shell and front panel, horizontal PCB mount, https://www.neutrik.com/en/product/nl8md-v STX Series, 4 pole chassis connector, black D-size flange, countersunk thru holes, horizontal PCB, https://www.neutrik.com/en/product/nl2md-h speakON Chassis Connectors, 2 pole chassis connector, gray D-size flange, switchable version of package Relay DPDT IM-relay FRT5 Kemet signal relay, DPDT, double coil latching, https://content.kemet.com/datasheets/KEM_R7002_EC2_EE2.pdf Kemet EC2 signal relay DPDT double dual coil latching through hole 3.3mm, height 4, Wuerth electronics 9774070951 (https://katalog.we-online.de/em/datasheet/9774070951.pdf), generated with kicad-footprint-generator Connector Phoenix Contact, SPT 2.5/10-V-5.0-EX 1732577 Connector Phoenix Contact, SPT 5/3-H-7.5 Terminal Block, 1732386 (https://www.phoenixcontact.com/online/portal/gb/?uri=pxc-oc-itemdetail:pid=1732386), generated with kicad-footprint-generator JST XH series connector, LY20-28P-DT1, 14 Circuits (http://www.jae.com/z-en/pdf_download_exec.cfm?param=SJ103130.pdf), generated with kicad-footprint-generator Hirose FH12, FFC/FPC.

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