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| Q1, Q2, Q3, Q4, Q5 R1, R2, R23, R24 R3, R21, R27, R28 R4, R6, R7 | 3 | 10uF | Polarized capacitor | | | C3 | 1 | 1 | 1 | TL074 | Quad Low-Noise JFET-Input Operational Amplifiers, DIP-8/SOIC-8/TO-99-8 | | C1 | 1 | SW_3PDT_x3 | Switch, triple pole double throw, separate symbols K switch single-pole double-throw spdt ON-ON illuminated LED SW PUSH SMALL http://www.ckswitches.com/media/1457/ksa_ksl.pdf SW PUSH 12mm http://katalog.we-online.de/em/datasheet/430476085716.pdf tact sw push 12mm SW PUSH 12mm http://katalog.we-online.de/em/datasheet/430476085716.pdf tact sw push PVA1 DPST momentary / push-push button, h=15mm C&K PVA2 https://www.ckswitches.com/media/1343/pva.pdf momentary / push-push button, h=17.5mm C&K PVA1 https://www.ckswitches.com/media/1343/pva.pdf momentary / push-push button, h=15mm C&K PVA1 https://www.ckswitches.com/media/1343/pva.pdf momentary / push-push button, h=15mm C&K PVA1 https://www.ckswitches.com/media/1343/pva.pdf momentary / push-push button, h=17.5mm C&K PVA1 https://www.ckswitches.com/media/1343/pva.pdf momentary / push-push button, h=17.5mm C&K PVA1 https://www.ckswitches.com/media/1343/pva.pdf momentary / push-push button, h=17.5mm C&K PVA1 https://www.ckswitches.com/media/1343/pva.pdf tact sw push 6mm tactile push button, 6x6mm e.g. PHAP33xx series, height=4.3mm tactile push button, 6x6mm e.g. PHAP33xx series, height=8mm tactile push button, 6x6mm e.g. PHAP33xx series, height=8.5mm tactile push button, 6x6mm e.g. PHAP33xx series, height=13mm FS5700 series pushbutton footswitch, DPDT, https://www.e-switch.com/system/asset/product_line/data_sheet/226/FS5700.pdf Switch with High Contact Reliability, Side-actuated Model, without Ground Terminal, with Boss Ultra-small-sized Tactile Switch for High-Density Mounting, 7.3mm height, https://omronfs.omron.com/en_US/ecb/products/pdf/en-b3fs.pdf Surface Mount.

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