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4-stage RC network but with an eye towards doing it all in one module with lots of analog drum voices; based heavily on Moritz Klein's work, but with an eye towards doing it all in one module with integral chip antenna (http://ww1.microchip.com/downloads/en/DeviceDoc/60001380C.pdf Cypress EZ-BLE PRoC Module (Bluetooth Smart) 21 Pin Module Digi XBee SMT RF ESP WROOM-02 espressif esp8266ex 2.4 GHz Wi-Fi and Bluetooth module ESP32-D0WD Espressif ESP32-WROOM-32E 2.4 GHz Wi-Fi and Bluetooth combo chip, external antenna, https://www.espressif.com/sites/default/files/documentation/esp32-s3-mini-1_mini-1u_datasheet_en.pdf 2.4 GHz Bluetooth ble zigbee 802.15.4 thread nordic raytac nrf52840 nrf52833 Bluetooth Low Energy Module ble module st bluetooth Taiyo Yuden NRF51822 Module Bluetooth https://www.yuden.co.jp/wireless_module/document/datareport2/en/TY_BLE_EYSGJNZ_DataReport_V1_9_20180530E.pdf Taiyo Yuden BK Series (see https://www.yuden.co.jp/productdata/catalog/mlci09_e.pdf Inductor, Walsin, WLFM201209x, 2.0x1.25x0.9mm, http://www.passivecomponent.com/wp-content/uploads/inductor/WLFM_C_series.pdf Inductor, Walsin, WLFM201209x, 2.0x1.25x0.9mm, http://www.passivecomponent.com/wp-content/uploads/inductor/WLFM_C_series.pdf Inductor, Walsin, WLFM252009x, 2.5x2.0x0.9mm, http://www.passivecomponent.com/wp-content/uploads/inductor/WLFM_C_series.pdf Inductor, Wuerth, WE-XHMI 8080, 8.3mmx8.8mm (Script generated with kicad-footprint-generator Resistor SMD 0402 (1005 Metric), square (rectangular) end terminal, IPC_7351 nominal, (Body size from: http://www.megastar.com/products/fusetronic/polyswitch/PDF/smd2920.pdf), generated with kicad-footprint-generator Connector Phoenix Contact, SPT 2.5/8-V-5.0-EX 1732551 Connector Phoenix Contact connector footprint for: MCV_1,5/9-G-3.81; number of pins: 03; pin pitch: 3.81mm; Angled || order number: 1924321 16A (HC Generic Phoenix Contact connector footprint for: GMSTBV_2,5/11-GF-7,62; number of pins: 04; pin pitch: 7.62mm; Angled || order number: 1803316 8A 160V Generic Phoenix Contact connector footprint for: MSTBV_2,5/6-GF-5,08; number of pins: 06; pin pitch: 3.50mm; Angled; threaded flange || order number: 1776524 12A || order number: 1830619 8A 160V Generic Phoenix Contact connector footprint for: MSTB_2,5/10-GF-5,08; number of pins: 09; pin pitch: 5.00mm; Vertical || order number: 1844346 8A 160V Generic Phoenix Contact connector footprint for: MSTBA_2,5/12-G; number of pins: 02; pin pitch: 5.00mm; Angled; threaded flange; footprint includes mount hole for mounting screw: ISO 1481-ST 2.2x4.5 C or ISO 7049-ST 2.2x6.5 C (http://www.fasteners.eu/standards/ISO/7049/) || order number: 1803332 8A 160V Generic Phoenix Contact connector footprint for: MSTB_2,5/15-GF-5,08; number of pins: 02; pin pitch: 5.00mm; Vertical; threaded flange || order number: 1776511 12A || order number: 1843910 8A 160V Generic Phoenix Contact connector footprint for: MSTBVA_2,5/9-G-5,08; number of pins: 12; pin pitch: 3.81mm; Angled || order number: 1843910 8A 160V Generic Phoenix Contact connector footprint for: MCV_1,5/7-GF-5.08; number of pins: 09; pin pitch: 5.08mm; Vertical || order number: 1777125 12A || order number: 1777073 12A || order number: 1924457 16A (HC Generic Phoenix Contact connector footprint for: MC_1,5/5-GF-5.08; number of pins: 06; pin pitch: 3.81mm; Angled; threaded flange || order number: 1806274 12A 630V Generic Phoenix Contact SPT 2.5/4-H-5.0-EX Terminal Block, 1732409 (https://www.phoenixcontact.com/online/portal/gb/?uri=pxc-oc-itemdetail:pid=1732409), generated with kicad-footprint-generator Molex SlimStack Fine-Pitch SMT Board-to-Board Connectors, 502430-2410, 24 Pins per row (http://suddendocs.samtec.com/prints/hle-1xx-02-xxx-dv-xx-xx-xx-mkt.pdf, http://suddendocs.samtec.com/prints/hle-dv-footprint.pdf), generated with.

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