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BackLoRa Transceiver Module LoRa Radio, RF, Module, http://www.hoperf.com/upload/rf/RFM69HW-V1.3.pdf 8 pin DIP socket | | | R3, R21, R27, R28 R4, R6, R7 | 2 | 1M | Resistor | | U1 | 1 | 10nF | Film capacitor | | | | C10 | 1 | B10k | Potentiometer | | J2 | 1 | ICM7555xP | CMOS General Purpose Timer, 555 compatible, PDIP-8"/>