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Back| 5 | 100nF | Ceramic capacitor | | | | | | R3, R21 | 2 pin Molex header Operational amplifier, DIP-8 | | | J3 | 1 | SW_SPDT | Switch, triple pole double throw, separate symbols K switch dual-pole double-throw DPDT 3pdt ON-ON D Push button switch | | | | | R4, R12, R13 | 3 | 22k | Resistor | | | | J5, J12, J13 | 3 | A1M | Potentiometer | | | Tayda | A-553 | | Screws and spacers (see build notes) 1 SIP socket, 2.54 mm, 1x7 | | | S3 | 1 | ICM7555xP | CMOS General Purpose Timer, 555 compatible, PDIP-8 0.2A Ic, 40V Vce, Small Signal NPN Transistor, TO-92 | | D3, D4, D5, D8, D9, D10 100V 0.15A standard switching diode, DO-35"/>