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Multi-purpose IC for Modellers(1)

two printed circuit boards and nine functions

Multi-purpose IC for Modellers(1)
The multi-purpose IC for modellers, offering a total of fourteen different functions, really comes into its own with the two printed circuit boards presented here. This board provides the speed control, soft start, motor voltage monitoring, BEC, anti-collision light, fail-safe, hot glow, servo balancing and go-slow functions.In the previous article in this series the multipurpose IC for modellers was presented with two application printed circuit boards. In this second and final instalment we present two further circuit boards. In total these four circuit boards offer fourteen different functions, all using the same IC, a Philips 87LPC762 microcontroller specially programmed for this project. The two new application circuit boards are the ‘motor control’ and the ‘goslow/hot glow’ boards. An overview of the four circuit boards and the functions they offer is given in Table 1.
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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.

PCB 010008-1 (Motor controller, Fig. 2)
Resistors:
R1 = 1kOhm
R2,R3 = see text
R4 = 3kOhm 6
R5 = 1kOhm 3
R6 = 3kOhm 6
R7 = 10kOhm
R8 = 10kOhm
Capacitors:
C1,C2 = 15pF
C3 = 100nF
C4 = 220µ F 16V radial
Semiconductors:
D1 = LED, red, low current
D2 = zener diode 5V1
D3 = BYV32-50
IC1 = 87LPC762BN (programmed, order code 010008-41)*
IC2 = LM2940-5.0
T1-T4 = BUZ71/IRLZ34N
T5 = BC548
T6 = IRF9530
Miscellaneous:
Bz1 = DC buzzer, 5V
X1 = 6MHz quartz crystal
2-way pinheader with jumper
PCB, order code 010008-1*
PCB 010008-3 (hot glow/go-slow, Fig. 4)
Resistors:
R1,R2 = 1kOhm
R3,R4 = 100kOhm
R5 = 1kOhm 3
R6 = 3kOhm 6
Capacitors:
C1,C2 = 15pF
C3 = 220µ F 16V radial
Semiconductors:
D1 = LED, red, low current
D2 = 1N4001
IC1 = 87LPC762BN (order code 010008-41)*
T1,T2 = BUZ71/IRLZ34N
Miscellaneous:
Bz1 = DC buzzer, 5 V
S1 = 4-way DIP switch
X1 = 6MHz quartz crystal
PCB, order code 010008-3*
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