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Speed Controller Duet (2)

construction, programming and the power units

Published in issue 296, February 2001

Part 1 presented an overview of the system. In part 2, we deal with the construction of the SpeedControl unit, user programming with a PC (via the RS232 interface) and finally the construction of the two power units: SpeedPower 1 and SpeedPower 2.SpeedControl constructionThe printed circuit board for the SpeedControl unit is shown in Figure 4. For economic reasons, this board is only available in combination with one of the two SpeedPower boards (see the Components List), so the first task is to saw apart the two boards (if you so desire).If you work calmly and carefully with a fine-tipped soldering iron and keep to the components identified in the Components List, you shouldn’t have any problems assembling the circuit board. A servo extension cable that has been cut in two can be used for the connecting cable. It is a good idea to fit a ferrite toroidal core onto the cable to the receiver, since this will isolate the circuit from high frequency signals from the receiver, and the remaining length of the cable will not degrade signal reception.

Components

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Resistors:
R1,R4,R8,R13 = 10k
R2 = 100k
R3,R7 = 2k 2
R5,R6,R9-R12 = 1k
R14,R15 = 560 ohm
P1 = multiturn preset, vertical mounting (e.g., Bourns 3386W)
Capacitors:
C1 = 220pF ceramic, lead pitch 2.5 mm
C2 = 100mF 16V, radial
C3 = 100nF
C4,C5 = 18pF ceramic
Semiconductors:
D1 =zener diode 2V3
D2,D3 = high-efficiency-LED (3 mm) red
D4 = high-efficiency-LED yellow
D5 = high-efficiency-LED green
D6,D7 = BAT85
T1,T5 = BC547
T2,T3,T4 = BC557
IC1 =ST62T60BB6, programmed, order code 000070-41
Miscellaneous:
S1 = pushbutton, make contact
X1 = 4MHz quartz crystal
Bz 1 = AC buzzer
Ferrite suppressor coil
PCB:
- in combination with SpeedPower1: order code 000070-5;
- in combination with SpeedPower2: order code 000070-4
SpeedPower 1
Resistors:
R1 = 680 ohm
R2,R3 = 470 ohm
R4,R5 = 2k 2
R6 = 1 ohm
R7 = 100k
R8 = 15 ohm
Capacitors:
C1 = 10µF 16V radial
C2,C3 = 100nF
C4 = 47µF 16V radial
C5 = 22nF
Semiconductors:
D1 = STPS3045CT
D2 = BAT85
T1 = BC547
T2,T3 = IRL2203N
IC1 = HCPL2630
IC2 = TC4426CPA
IC3 = L4940V5
Miscellaneous:
Re1, Re2 = relay, Fujitsu 51ND06-N (Conrad Elecrronics #505099-11)
PC1-PC9 = solder pin
PCB, order code 000070-5 (in combination with SpeedControl)
SpeedPower 2
Resistors:
R1,R2,R3 = 470 ohm
R4 = 330 ohm
R5,R6 = 2k 2
R7 = 39 ohm
R8,R11 = 1 ohm
R9 = 560 ohm
R10 = 15 ohm
Capacitors:
C1,C4 = 100nF
C2,C5 = 47µF 16V radial
C3 = 22nF
Semiconductors:
D1,D2 = BAT85
D3 = zener diode 4V7
D4 = STPS3045CT
T1 = BC547
T2 = MTP50P03HDL
T3,T4 = IRL2203N
IC1 = HCPL2630
IC2 = TC4428CPA
IC3 = L4940V5
Miscellaneous:
PC1-PC9 = solder pin
PCB, order code 000070-4 (in combination with SpeedControl)

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