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Replacement module for the SL486 & MV601 remote control receiver ICs This simple module is a replacement for the Plessey SL486 & MV601 infrared preamplifier & receiver ICs. It’s based on a new IR receiver subsystem plus a specially programmed Z86 microcontroller. By RICK WALTERS Over the years, SILICON CHIP has described a number of projects that included infrared remote control. Several of these were based on the Plessey SL486 & MV601 infrared preamplifier and receiver ICs but unfortunately these devices are no longer avail­able. There are three projects involved, as follows: (1). Infrared Remote Control For Model Railroads, April-May 1992; (2). Remote Volume Control For Hifi Systems, May-June 1993; and (3). Stereo Preamplifier With IR Remote Control, Sept-Nov 1993. For a while, it looked as though these circuits would all become obsolete, or that readers would not be able to get re­placements if either of the two Plessey devices failed. Fortu­nately, a new infrared (IR) receiver subsystem recently became available and so we’ve been able to come up with a module that’s a complete replacement for the two Plessey devices. Of course, the module is not a dropin replacement since two separate ICs were originally used. Instead, the board has to be mounted separately and flying leads used to make the connec­ tions after the two Plessey devices have been removed. This is quite straightforward, since the outputs from the module are labelled exactly the same as for the original MV601 device. Before we take a closer look at the new circuit, let’s briefly recap on the roles of the original devices. The SL486 was basically an infrared preamplifier IC that processed IR signals picked up by an external photodiode. It included a differential input to reduce noise pick-up, several amplifier stages and an AGC circuit. Its output was then fed to the MV601 “remote control receiver” IC. Fig.1: the circuit is based on a Z1954 (or equivalent) IR receiver subsystem (IC1) and a Z86E08 microcontroller (IC2). IC1 takes the place of the original SL486 preamplifier IC and its external photodiode, while IC2 does the job of the MV601. April 1996  53 PARTS LIST 1 PC board, code 09103961, 50 x 50mm 1 Z1954 (DSE) or PIC12043 (Oatley Electronics) – (IC1) 1 Z86E08 programmed microcontroller (available from Silicon Chip) – (IC2) 1 18-pin IC socket (optional) 1 4MHz crystal (X1) 1 5mm LED (LED1) Fig.2: install the parts on the PC board as shown here. Leave the two links (shown dotted) out if you intend using the device in SILICON CHIP projects. Fig.3: this is the full-size etching pattern for the PC board. Check your board carefully for any defects before installing the parts. Capacitors 1 47µF 16VW electrolytic 1 0.1µF MKT polyester 1 680pF ceramic 2 22pF NPO ceramic Resistors (0.25W, 1%) 4 100kΩ 1 47Ω 1 470Ω This larger-than-life-size view shows the completed PC board. Make sure that the microcontroller carries an RXD label. The MV601 decoded the signal from the SL486 and provided five BCD outputs (labelled A-E). These could be either momentary or latched, depending on whether pin 5 was high or low. In addi­tion, the MV601 provided a “data ready” output at pin 10. This output was normally high but would go low whenever a valid code was present on the A-E outputs. Finally, pins 3 & 4 were the “rate” inputs and these were connected to match the transmitter rate connections. IR receiver subsystem The new IR receiver subsystem carries the type designation Z1954 and is available from Dick Smith Electronics. An equivalent device, designated PIC12043, is also available from Oatley Elec­tronics. We’ve tested both devices in this circuit and found that they offer similar performance. In each case, the device looks a bit like a small 3-terminal regulator but has a plastic bubble on the front which is the lens for the IR receiver diode. The Z1954 is actually a lot simpler to use than the SL486 it replaces, as it needs no external components around it. As well as the IR receiver diode, the TO-220 style package contains an amplifier, a limiter, a bandpass filter and a demodulator. Its on-axis reception distance is quoted as eight metres but this will obviously depend on the light output from the source. Circuit details Fig.1 shows the circuit of the replacement module. IC1 is the Z1954 IR receiver subsystem. Its output appears at pin 1 and is fed to pin 9 of IC2, the Z86 IC. Note that the output of IC1 is actually inverted, compared to the transmitted signal, but this is compensated for in IC2. RESISTOR COLOUR CODES ❏ No. ❏  4 ❏  1 ❏  1 54  Silicon Chip Value 100kΩ 470Ω 47Ω 4-Band Code (1%) brown black yellow brown yellow violet brown brown yellow violet black brown 5-Band Code (1%) brown black black orange brown yellow violet black black brown yellow violet black gold brown The Z86E08 microcontroller used for IC2 is the same type of device used in the recent Railpower Mk.2 project (Sep-Oct 1995 & Jan 1996). This time, however, it has been programmed to emulate the MV601 codes. The processor needs a crystal, a couple of capacitors and four resistors to do the emulation. An acknowledge LED has also been included to indicate the reception of a valid code. When power is first applied to the microprocessor, it checks the A & B rate inputs and, depending on the linking, sets the internal timer to the correct frequency. It then waits until two pulses with a 6T period between them appear at pin 9 (P32) of IC2. This is the synchronising pulse time. Once a sync pulse has been recognised, the next five bits of data are decoded as zeros or ones and stored. This data string will be repeated a number of times before the transmitter button is released. The next string is also decoded and compared with the first one. If they are identical, the data is made available at P20-P24 and the DATA READY line is pulled low, thereby illuminating LED1. Finally, linking options have been provided to latch the output data (output 5 low) and Tristate the outputs (output 9 high). These functions were provided to allow complete compa­tibility with the MV601. Note: Tristate outputs were not used in the SILICON CHIP designs. Construction A small PC board coded 09103961 (50 x 50mm) has been de­signed to hold all the parts. Fig.2 shows the wiring details. As shown on this diagram, some of the pads have numbers next to them. These numbers refer to the equivalent pin on the MV601. The two optional links are shown dotted – leave them off the board if you intend using the module in the aforementioned SILICON CHIP projects. This will ensure momentary operation of the A-E outputs (ie, the decoded outputs will only go high while the transmitter button is being press­ed). Alternatively, install the link at output 5 if you want latched outputs and the link at 9 for Tristate out­puts. The remaining parts can be installed on the board in any order although its best to leave the microcontroller (IC2) until last. A socket can be used for this IC or you can solder it directly to the PC board. Both the acknowledge LED (LED1) and the IR receiver subsystem (IC1) can be connected to the PC board via flying leads if that makes for more convenient mounting arrangements. Testing Being such a simple board, it should work first go without any problems. The only way to confirm its operation is to illu­minate it with one of our previous remote controls which uses an MV500 remote control IC and a 500kHz resonator. The acknowledge LED should light whenever a valid code is received. If it doesn’t, make sure that the A and B rate programming in the transmitter and receiver are the same. If you do have a problem, look for dry solder joints and for solder bridges between the IC pins. Footnote: the programmed Z86E08 microprocessor (RXD) is available from Silicon Chip Publications for $18 SC (incl. p&p). X-ON ELECTRONIC SERVICES WHOLESALE TO THE PUBLIC SEMICONDUCTORS ULN2804A 1N914 1N4004 1N4148 1N4936 1N5404 78L05 BB119 BC327 BC328 BC337 BC338 BC548 BC549 BC558 BC639 BC640 BD139 BD140 BD649 BD650 BS170 BZV85C16 BZV85C75 BZW03C75 BZV85C16 BZX79C5V6 C7805H HEF4046BP HEF4053BP HEF4066BP ICM7555CN IRF540 LF347N LM317T LM358N LM386N-1 LM393N LM833N LM1875T $2.82 $0.04 $0.10 $0.04 $0.39 $0.27 $0.95 $0.52 $0.31 $0.31 $0.31 $0.31 $0.18 $0.18 $0.18 $0.57 $0.57 $1.16 $1.16 $1.71 $1.71 $0.88 $0.37 $0.49 $1.83 $0.37 $0.18 $1.53 $1.34 $1.10 $0.82 $1.34 $8.54 $4.09 $2.14 $1.10 $1.71 $1.16 $2.14 $7.32 LM3914N LM7805CT LM7808CT LM7812CT LM7815CT LM7915CT MC68HC705C8P MTP3055E NE555N NE571N NE602AN NM93C46N PC74HC11P PC74HC42P PC74HC132P PC74HC573P PC74HC4051P PC74HC4040P PCF8573P TDA1074A TEA1100 TL071CP TL072CP TL074 W04M CRYSTALS HC-38C-32.76800-kHz HC-49/U-2.000000-MHz HC-49/U-3.579545-MHz HC-49/U-4.000000-MHz HC-49/U-10.00000-MHz CAPACITORS CERAMIC 2222-681-09688 6P 10P/5MM 22P/5MM 33P/5MM 39P/5MM 47P/5MM 68P/5MM 100P/5MM 150P/5MM CAPACITORS BOXED POLYESTER 100V MKT 2222-370-11104 100N $0.29 2222-370-11184 180N $0.37 2222-370-11684 680N $0.83 2222-370-18474 470N $0.61 2222-370-21153 15N $0.22 2222-370-21223 22N $0.22 2222-370-21473 47N $0.27 2222-370-21563 56N $0.27 2222-370-11683 68N $0.27 2222-370-18224 220N $0.33 2222-370-11334 330N $0.45 2222-370-41472 4N7 $0.22 2222-370-41562 5N6 $0.22 2222-370-42103 10N $0.22 2222-370-51102 1N $0.22 2222-370-51222 2N2 $0.22 2222-370-66332 3N3 $0.22 CAPACITORS MONOLTHIC CERAMIC 5M PITCH 0.1uF/0.2 100N $0.16 URD30E474MT 470NF $0.43 FUSES AND HOLDERS 210030SX PCB FUSE CLIP M205 $0.12 AGE10 10A 3AG 32*6MM $0.32 AGE3 3A 3AG 32*6MM $0.32 GME1 1A M205 20*5MM $0.32 GME3.15 3.15A M205 20*5MM $0.32 INLINEFUSE INLINE HOLDER $0.85 JEF-510 PCB M205 HOLDER $0.49 TO220B TO220 BUSH (56359C) $0.07 CONNECTORS 396H-3 3 WAY 3.96MM HOUSING $0.37 396H-5 5 WAY HOUSING 3.96MM SPACING $0.55 DN-8P DIN 8 WAY MALE PLUG $1.71 ETB-11-03 3 WAY PCB TERMINAL BLK $0.93 H1-40-G-07 40*1 PIN HEADER STR $0.55 ICS-8-A-T 08 PIN IC SOCKET $0.20 ICS-16-A-T 16 PIN IC SOCKET $0.31 ICS-18-A-T 18 PIN IC SOCKET $0.33 MJG MINI JUMPER SHUNTS $0.12 PLCC-44-T 44 PIN PLCC IC SOCKET $2.03 POW016 MAINS POWER CORD IEC $6.71 FERRITES 4312-020-38040 ETD49 3F3 CORE NO GAP $4.58 4312-020-41080 EFD20 3F3 CORE NO GAP $1.60 4322-021-33920 ETD49 CLIP $0.61 4322-021-35150 EFD20 CLIP $0.49 FASTENERS 030449C 4X1/2 SLOTTED PAN $5.88 PKT 100 030452B 6X1/2 SLOTTED PAN $7.25 PKT 100 030455G 8X1/2 SLOTTED PAN $6.70 PKT 100 030466A 6X3/8 SUPADRIV PAN $6.15 PKT 100 031524H M3X6 SLOTTED PAN $4.62 PKT 100 031525F M3X10 SLOTTED PAN $4.31 PKT 100 031526D M3X12 SLOTTED PAN $4.51 PKT 100 031527B M3X16 SLOTTED PAN $4.95 PKT 100 031528X M3X20 SLOTTED PAN $4.58 PKT 100 031529R M3X25 SLOTTED PAN $8.22 PKT 100 031583H M3X6 SLOTTED CSK $5.77 PKT 100 031584F M3X12 SLOTTED CSK $4.31 PKT 100 031615B M2.5 FULL NUTS $6.64 PKT 250 031616X M3 FULL NUTS $6.75 PKT 250 031630D M3 S/PROOF WASHERS $3.76 PKT 250 035941R 5mm SPACER $10.48 PKT 50 403375H 6mm SPACER $11.33 PKT 50 403377D 8mm SPACER $12.96 PKT 50 403378B 12mm SPACER $16.60 PKT 50 403380C HTLP3050-08 $12.18 PKT 50 403381A HTLP3050-12 $16.07 PKT 50 HARDWARE CV100 CABLE TIE 100*2.5MM $0.05 $4.88 $1.53 $1.53 $1.53 $1.53 $1.53 $28.06 $2.56 $0.73 $7.20 $4.27 $3.42 $0.73 $1.34 $1.10 $1.83 $1.34 $1.34 $11.71 $15.49 $15.49 $1.83 $2.32 $3.05 $0.98 $1.27 $4.60 $2.44 $2.44 $2.44 $0.12 $0.12 $0.12 $0.12 $0.12 $0.12 $0.12 $0.12 $0.12 180P/5MM $0.12 220P/5MM $0.12 270P/5MM $0.12 470P/5MM $0.12 680P/5MM $0.12 820P/5MM $0.12 GREENCAPS GC0.001uF $0.18 GC0.0027uF $0.18 GC0.01uF $0.18 GC0.022uF $0.18 GC0.039uF $0.18 GC0.082uF $0.18 GC0.1uF-100V $0.24 ELECTROLYTIC CAPACITORS LL10/50 $0.31 RB1/63 $0.18 RB2.2/50 $0.18 RB4.7/63 $0.18 RB10/50 $0.18 RB22/25 $0.18 RB33/35 $0.24 RB47/25 $0.24 RB100/16 $0.31 RB100/25 $0.31 RB220/16 $0.31 RB220/63 $0.73 RB470/16 $0.55 RB470/25 $0.61 RB1000/16 $0.67 RB1000/25 $0.85 RB2200/25 $1.22 RB4700/16 $2.32 RB4700/50 $4.64 RB10000/25 $5.86 80x80x25mm 12V FANS B802512BL $12.00 HEATSINKS 5mm 274-2 HEATSINK TO220 LEDS AND OPTO ELECTRONICS CSL-300E1DT 3MM ORANGE ROUND CSL-300G1DT 3MM GREEN CSL-300H1GT 3MM RED CSL-300Y1BT 3MM YELLOW CSL-500E1DT 5MM ORANGE CSL-500G1DT 5MM GREEN CSL-500H1DT 5MM RED CSL-500Y1DT 5MM YELLOW CSL-620E1DT 5MM*2MM ORANGE CSL-620G1DT 5MM*2MM GREEN CSL-620H1DT 5MM*2MM RED CSL-620Y1DT 5MM*2MM YELLOW POTENTIOMETERS VG067TH1 SIDE ADJUST TRIMMERS VG067TL1 TOP ADJUST TRIMMER RELAYS R729/DC12-1C SPDT 12VDC 10AMP H100S24-1-C PCB RELAY SPDT RESISTORS MRS25 SERIES 1% 0.6 WATT MF25 SERIES 1% 1/4 WATT CR25 SERIES 5% 1/4 WATT SIP10A-102G 1K 10P 9RES RESNET SIP10A-103G 10K 10P 9R RESNET SIP10A-153G 15K 10P 9R RESNET SQP5-0R1 0R1 5W RESISTOR SQP5-82R 82R 5W RESISTOR SQP5-100R 100R 5W RESISTOR SWITCHES EDS-1-4-S DIP 4-WAY PCB 8222/RED RED PUSH BUTTON 8222/BLACK BLACK PUSH BUTTON BUZZERS TDB-12PN BUZZER 12MM PIEZO 7S3240-LA BUZZER 1.5-28VDC BATTERIES 9 VOLT BATTERY SNAP CABLES AND WIRE (PRICED PER MTR) 011251B 30 AWG 1/30 BLACK 011252X 30 AWG 1/30 BLUE 011254G 30 AWG 1/30 GREEN 011256C 30 AWG 1/30 ORANGE 011257A 30 AWG 1/30 RED 011260X 30 AWG 1/30 YELLOW CA-26 RIBBON CABLE 26-WAY $0.73 $0.18 $0.18 $0.18 $0.18 $0.18 $0.18 $0.18 $0.18 $0.18 $0.18 $0.18 $0.18 $0.49 $0.49 $6.04 $2.75 $0.07 $0.06 $0.02 $0.37 $0.37 $0.37 $0.49 $0.49 $0.49 $1.71 $0.73 $0.73 $2.75 $2.93 $0.27 $0.15 $0.15 $0.15 $0.15 $0.15 $0.15 $2.26 KEEP YOUR HOBBY AFFORDABLE. THIS IS A SAMPLE OF OUR MASSIVE RANGE TAKEN FROM RECENT PROJECTS PUBLISHED. DEL CHARGE $8.00 FREE DELIVERY FOR ORDERS OVER $200. 10% DISCOUNT FOR 10+ SAME ITEM PRICES TAX INCLUDED MASTER/VISA/BANK/AMEX CARD X-ON ELECTRONIC SERVICES 1161 ALBANY HWY, BENTLEY PHONE: 09 351 9202; FAX: 09 458 5545 IF ITS NOT HERE JUST ASK. OVER 200,000 LINES AVAILABLE! April 1996  55