Battery Cooler

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Materials
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.
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Component list
R1 = 1kOhm
R2 = 5kOhm 6
R3 = 6kOhm 8
R4 = 8kOhm 2
R5 = 12kOhm
R6 = 15kOhm
R7 = 18kOhm
R8 = 22kOhm
R9,R12 = 1kOhm 8
R10,R15 = 4kOhm 7
R11 = 3kOhm 9
R13 = 270Ohm
R14 = 1Ohm 5 5W
Capacitors:
C1,C2,C3 = 100nF
Semiconductors:
D1,D2 = zener diode 2V7 400mW
D3 = LED, red, high efficiency
D4 = zener diode 3V3 400mW
T1 = BC547
T2,T5 = BC557
T3 = BD139
T4 = TIP141/TIP142
IC1 = TL072
Miscellaneous:
S2 = on/off switch, 1 make contact
S1 = rotary switch, 2 poles, 6 positions
M1 = fan, 12V
Heatsink for T4: 3K/W, e.g., Fischer SK48 (Dau Components)
PCB, order code 014126-1
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