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Principle of Tan Timer

2017-08-10 11:40  
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This article is Tan  timer  principles discussed. The principle of combining text comprehension is a good suggestion. The principle is very simple but very practical and effective. Requires only one time set suitable for your skin type, rotary switches can be replaced by hard-wired link. A tilt switch can be used instead of Rotary type. Please note that only one switch in the device off, or ICs may be damaged.
Tan Timer



R1_____________47K   1/4W Resistor
R2______________1M   1/4W Resistor
R3,R5_________120K   1/4W Resistors
R4____________Photo resistor (any type)

C1,C3__________10μF   25V Electrolytic Capacitors
C2____________220nF   63V Polyester Capacitor

D1,D2________1N4148   75V 150mA Diodes

IC1____________4060  14 stage ripple counter and oscillator IC
IC2____________4017  Decade counter with 10 decoded outputs IC

Q1____________BC337   45V 800mA NPN Transistor

SW1___________2 poles 6 ways Rotary Switch (see notes)
SW2___________SPST  Slider Switch

BZ1___________Piezo sounder (incorporating 3KHz oscillator)

B1____________3V Battery (two 1.5V AA or AAA cells in series etc.)
Photo-typeFeaturesExposure time
I & childrenLight-eyed, red-haired, light complexion, freckly20 to 33 minutes
IILight-eyed, fair-haired, light complexion28 to 47 minutes
IIILight or brown-eyed, fair or brown-haired, light or slightly dark complexion40 to 67 minutes
IVDark-eyed, brown-haired, dark complexion52 to 87 minutes
VDark-eyed, dark-haired, olive complexion88 to 147 minutes
VIThe darkest of all136 to 227 minutes
Note that pregnant women belong to Photo-type I



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