Mains Remote Switch
Published in issue 312, July 2002
This compact design forms a remotely operated switch that receives its control signal via the mains voltage. The switch is operated using the ‘mains remote transmitter’ described elsewhere in this issue. With this transmitter, a switch should be connected between pins 1 and 2 of K1. Depending on the application, this must be either a press contact or a make contact.The idea of the ‘mains remote switch’ is that a relay is energised in order to connect the mains voltage on K1 through to K2.
Resistors:
R1 = 1MOhm 5
R2 = 220kOhm
R3 = 39kOhm
R4 = 6kOhm 8
R5 = 220Ohm
R6,R7 = 470kOhm
P1 = 10MOhm preset
Capacitors:
C1 = 22nF 275VAC Class X2, lead pitch 15mm
C2 = 22nF, lead pitch 5 mm
C3 = 220pF
C4 = 2nF2, lead pitch 5mm
C5 = 680pF
C6 = 100nF, lead pitch 5 mm
C7 = 100µ F 40V radial
C8 = 330nF 275VAC, Class X2, lead pitch 22.5mm or 27.5mm
Inductors:
L1 = 470µ H
Semiconductors:
D1 = BAT85
D2 = 1N4148
D3 = zener diode 24V 1.3W
D4-D7 = 1N4007
T1 = BC557B
T2 = BC547B
Miscellaneous:
K1,K2 = 2-way PCB header, lead pitch 7.5 mm
Tr1 = 5:5 turns 1mm dia. isolated wire on N30 ring core 16x6.3 mm, B64290L45X830 EPCOS (Farnell # 311-0266)
Re1 = PCB relay, 1 c/o contact, 8A 24V 1200Ohm , e.g., Schrack # V23057-B0006-A201
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Click below to download a PDF copy of this article from Elektor magazine. Please note. In view of the complexity of international markets, Elektor cannot guarantee the availability of components for this project.
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