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Mains Remote Control: Decoder

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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Materials

Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor GREEN and GOLD 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.

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PCB

Component list

Resistors:
R1 = 100kOhm
R2 = 47kOhm
R3 = 1MOhm
R4 = 330kOhm
R5 = 10MOhm
P1 = 25kOhm preset
P2 = 100kOhm preset
P3 = 50kOhm preset
Capacitors:
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
Inductor:
L1 = 470µ H miniature choke
Semiconductors:
D1,D2 = BAT85
T1,T2 = BC547
IC1 = HT12D/F (Holtek) (Farnell) *
IC2 = 4069U
IC3 = 4538
IC4 = 7812
Miscellaneous:
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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