Building the circuit.
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Here is an example of the built circuit on a small piece of stripboard. The 2p coin gives an indication of size. I have not included the diode D1 in this example.
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Side view.
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General layout of components.
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Under side of the board showing the breaks in the stripboard tracks. Note the use of solder bridges to link leads on IC1.
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Underside of the board showing component locations.
Component List: figures in brackets are
Rapid Electronics stock codes.
IC1 = MIC502BN (82-4026)
T1 = TIP122 (81-0172)
D1 = 1N4001 (47-3420)
R1 = 10K (62-2146)
R2 = 15K (62-2154)
R4 = 270R (62-2070)
VR1 = 10K Linear (65-0715)
VR2 = 47K Linear (65-0725)
Thermistor = (61-0515)
C1 = 0.1uF (10-3220)
C2 = 220uF 25V (11-0265)
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