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Car Voltage Alarm

The links to the Maplins web site and prices are from August 2012.

Component

Value

Maplins Code

Price

Note

R1

1K Ohms

M1K

26p

 

R2

6.8K Ohms

M6K8

26p

R2 + R3 = 7K

R3

200 Ohms

M200R

26p

 

R4

1K Ohms

M1K

26p

 

R5

10K Ohms

M10K

26p

 

R6

510 Ohms

M510R

26p

 

R7

10K Ohms

M10K

26p

 

R8

5.6K Ohms

M5K6

26p

R8 + R9 = 5K

R9

47K Ohms

M47K

26p

 

R10

2.2K Ohms

M2K2

26p

 

R11

2.2K Ohms

M2K2

26p

 

R12

150K Ohms

M150K

26p

 

C1

0.1 uF

N43CJ

29p

Not fussy

ZD1

6.2V Zener

QH09K

39p

 

LED1

5mm green

WL30H

59p

Not fussy

LED2

5mm yellow

WL28F

59p

Not fussy

B1

12V/5mA Buzzer

KU58N

1.99

 

IC1

LM393N

UH30H

99p

 

TR1

2N2222 or BC547C

BC547C

39p

Any small NPN

Total

8.35

 

Plug

RAYNET free or

BV63T

2.99

 

Box

You choose!

KC91Y ?

2.59

Must fit your

circuit board.

Stripboard

Think!

JP47 ?

3.49

Best to buy large and cut off as required.

 

 
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Page updated on 09 January 2017

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