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Mains Remote Transmitter

Mains Remote Transmitter
This circuit can be used to superimpose a 143-kHz carrier on the mains voltage, which allows various applications to be realised. One example is the ‘Mains Remote Switch’. Besides the power supply, the circuit consists of only a sine-wave oscillator, a buffer stage and an output transformer for isolation from the mains network.The oscillator, which is built around IC1a, is a standard Wienbridge design whose frequency is determined by R1, C1, R2 and C2. The combination of R3, R4 and the amplitude stabilisation circuitry built around T1 provides a gain of 3.
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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.

R1,R2 = 1k10 1%
R3 = 47kOhm
R4 = 22kOhm
R5,R18,R19 = 2kOhm 2
R6,R7 = 1MOhm
R8,R10 = 10kOhm
R9,R16,R17 = 220kOhm
R11 = 4kOhm 7
R12 = 1kOhm
R13,R14,R15 = 10Ohm
P1 = 5kOhm preset
C1,C2 = 1nF 1%
C3,C7 = 100pF
C4 = 1nF
C5,C6 = 470pF
C8 = 4nF7
C9 = 330nF
C10 = 1µ F 275VAC, Class X2, lead pitch 27.5 mm
C11 = 100nF
C12,C14 = 10µ F 63V radial
C13 = 100nF ceramic, lead pitch 5 mm
C15 = 470µ F 25V radial
D1,D2,D3 = 1N4148
D4,D5 = zener diode 4V7 1.3W
T1,T2,T3 = BF245A
T4 = BD139
T5 = BD140
IC1 = AD827JN Analog Devices (Farnell)
IC2 = 7812
K1 = 4-way pinheader
K2 = 2-way PCB terminal block, lead pitch 7.5mm
B1 = B80C1500 (rectangular case) (80V piv, 1.5A)
F1 = fuse, 32mAT (slow), with PCB mount holder and cap
Tr1 = 6:1 N30 core 16x6.3 mm EPCOS B64290L45X830 (Farnell)
Tr2 = mains transformer 15V >3VA, dims. 35x41mm, e.g., Hahn BV EI 382 1193 (15 V/4.5 VA) or Block VB 3,2/ 1/ 15 (15 V/3.2 VA, short-circuit resistant)
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