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Mains Remote Switch

Mains Remote Switch
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.
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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor Members can exclusively download these files for free as part of their Membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service. Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

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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