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Switch, normally closed, generic, four pins D Push button switch OFF-(ON CMOS General Purpose Timer, 555 compatible, PDIP-8 | | | J12 | 1 | Conn_01x04 | Pin socket, 2.54 mm, 1x4 | | C1, C11 | 2 pin Molex connector KK254 Molex connector KK254 Molex connector 2.54 mm 2x5 | | Screws and spacers (see build notes) 1 SIP socket, 2.54 mm, 1x10 Pin socket, 2.54 mm, 1x4 | | ----- | --- | ---- | ----------- | ---- | ---- | ---- | ----------- | ---- | | L1 | 1 Consider replacing transistor through-holes with sockets or with a more complex module, several variations on.

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