Parts List
1 double-sided plated-through PCB coded 01101221, 67 x 121.5mm
available from the PE PCB Service
3 (2) 30V DC 10A contact, 24V DC coil DPDT PCB-mount/cradle relays
(RLY1-RLY3) [Altronics S4313, Jaycar SY4007]
8 (6) 2-way 5.08mm pitch mini terminal blocks (CON1-CON8)
1 44mm-tall, 16.5 x 10mm PCB-mount finned heatsink (HS1; for Q16)
[Altronics H0645]
1 TO-126 or TO-220 silicone insulating washer and insulating bush
[Altronics H7230, Jaycar HP1176]
1 M3 x 10mm panhead machine screw
1 M3 shakeproof washer
1 M3 hex nut
4 tapped spacers and 8 machine screws (to suit installation)
Semiconductors
16 (11) BC547B/C 50V 100mA NPN transistors, TO-92
(Q1-Q3, Q5, Q6, Q8-Q10, Q12, Q13, Q15, Q17-Q19, Q21, Q22)
6 (4) BC557B/C 50V 100mA PNP transistors, TO-92 [BC558-9B/C will also
work] (Q4, Q7, Q11, Q14, Q20, Q23)
1 BD139 80V 1.5A NPN transistor, TO-126 (Q16)
1 27V 1W zener diode (ZD1) [1N4750]
3 (2) 1N4004 400V 1A diodes (D1-D3)
Capacitors
6 (4) 47μF bipolar/non-polarised electrolytic [Jaycar RY6820]
3 47μF 50V electrolytic [Altronics R4807 or Jaycar RE6344]
Resistors (all 1/4W 1% metal film axial)
6 (4) 33k-100kW (see text; if unsure, use 100kW)
1 47kW 3 (2) 4.7kW
(n) for the four-channel version (PCB code 01101222, 67 x 91mm), the
quantities required are listed in red.
