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Auto On/Off for Solder Paste Compressor

Do you often forget to switch off the air compressor of your solder paste dispenser? This simple project may be just what you need.

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Materials

Resistors

R1 = 100 Ω

R2 = 270 k

R3,R4* = 10 k

Capacitors

C1,C4 = 100 µ/25V radial

C2,C3 = 100 n

Semiconductors

D1,D2 = 1N4148

T1 = BC547

IC1 = NE555

Miscellaneous

K1 = 3-way terminal block, pitch 200 mil

K2 = 2-way terminal block, pitch 200 mil

Re1 = relay 12V DPDT (Schrack RTS3T012)

IEC C13 power outlet (e.g. Bulgin Limited PX0675/63)

IEC C14 plug (e.g. Bulgin Limited PX0686/WH)

* = see text