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Back1 nF | Unpolarized capacitor | | J8 | 1 | SW_SPDT | Switch, single pole double throw, separate symbols Quad Low-Noise JFET-Input Operational Amplifiers, DIP-14/SOIC-14 | | | R20, R22 | 3 | 100R | Resistor | | ----- | --- | ---- | ---- | ---- | ---- | ----------- | ---- | ----------- | ---- | | R30 | 1 | ICM7555xP | CMOS General Purpose Timer, 555 compatible, PDIP-8"/>