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SMD Reflow Soldering Oven

SMD boards hot from the oven

SMD Reflow Soldering Oven
It’s usually possible to solder ‘ordinary’ SMD components using a low-power soldering iron and small-gauge solder. However, it’s a completely different story when you have to solder a component in a BGA, CSP or similar package. Such components can actually only be soldered using a reflow soldering oven. Here we describe how a normal, inexpensive oven can be transformed into a reflow oven.
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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.

Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

Component list
R1,R2 = 150
R3 = 10
R4 = SIL array 8 x 10k
R5 = SIL array 4 x 1k
R6 = 10k
P1 = 10k
C1,C4,C5,C12,C13,C15 = 100nF
C2,C3 = 27pF
C6-C9,C14 = 10µF 16V radial
C10,C11 = 470µF 16V radial
B1 = B80C1500 bridge rectifier, 80V piv, 1.5A
D1,D2,D3 = LED, red, low-current
IC1 = MAX6675
IC2 = AT89C52/24JI, programmed, order code 050319-41
IC3 = MAX232
IC4,IC5 = S202S12
IC6 = 24LC64
IC7 = 7805
K1 = connector for thermocouple
Thermocouple, K-type
K2 = 9-way sub-D socket (female), PCB mount
K3,K4,K5 = 2-way PCB terminal block, lead pitch 7.5mm
K6 = connection for LCD backlight LCD1 = LCD module, 2x16 characters, e.g. order code 030451-72 or PLED version 030451-73
S1-S6 = pushbutton, ITT type D6-R
Tr1 = mains transformer, primary 230V, secondary. 6V (e.g. Monacor/Monarch VTR-3106)
X1 = 12 MHz quartz crystal
PCB, ref. 050319-1 from The PCBShop
Disk, source and hex code files, order code 050319-11
17 wire links
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