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Mains Remote Control: Decoder

Mains Remote Control: Decoder
This receiver/decoder forms part of a simple mains network remote control system, which also includes the ‘Mains Remote Transmitter’ and the ‘Mains Remote Encoder’.The decoder is built around IC1, which is a Holtek type HT12D or HT12F. For the receiver we use the same circuit as in the ‘mains remote switch’, namely a passive circuit tuned to approximately 143 kHz, since we assume that the transmitter is powerful enough to provide an adequate signal.
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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 = 100kOhm
R2 = 47kOhm
R3 = 1MOhm
R4 = 330kOhm
R5 = 10MOhm
P1 = 25kOhm preset
P2 = 100kOhm preset
P3 = 50kOhm preset
C1 = 100pF
C2 = 1µ F MKT, lead pitch 5mm or 7.5mm
C3 = 22nF 275VAC, Class X2
C4 = 22 n ceramic, lead pitch 5mm
C5,C7 = 220pF
C6 = 2nF2 ceramic, lead pitch 5mm
C8,C9,C10 = 100nF
C11 = 100nF ceramic, lead pitch 5mm
C12 = 10µ F 63V radial
C13 = 470µ F 25V radial
C14-C17 = 47nF ceramic, lead pitch 5mm
L1 = 470µ H miniature choke
D1,D2 = BAT85
T1,T2 = BC547
IC1 = HT12D/F (Holtek) (Farnell) *
IC2 = 4069U
IC3 = 4538
IC4 = 7812
K1 = 4-way pinheader
K2 = 2-way PCB terminal block, lead pitch 7.5mm
S1 = 8-wayDIP-switch
S2 = 4-way DIP-switch *
B1 = B80C1500 (rectangular) (80V piv, 1.5A)
TR1 = N30 ring core 16x6.3 mm EPCOS B64290L45X830 (Farnell) *
TR2 = mains transformer 15V/1.5VA, short circuit resistant, e.g., Block type VB 1,5/ 1/ 15
* see text
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