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Rodent Deterrent

environmentally friendly and humane

Rodent Deterrent
Rodent Deterrent
Mice, rats and even the playful and inquisitive marten are rodents that are certain to make a considerable nuisance of themselves whenever they interact with human activity. Their presence will result in unpleasant odours and irritating noises while their sharp teeth will cause havoc with rubbish bags, hoses, (car) electrical wiring and just about everything else. Therefore, suitable measures are in order and electronics can prove itself indispensable here.Most humans are not too fond of rodents, particularly when they decide to move into our premises against our express wishes. Their behaviour and presence will cause the destruction of all kinds of things, generally leave a bad smell and can also convey diseases.So, how best to deal with them? There are the obvious options of traps and poisons. While simple and usually effective, there is always the risk that they catch the wrong animal or arouse the curiosity of an unsuspecting child.
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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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PCB

Component list

Resistors:
R1,R2,R35 = 47k?
R3,R7,R10 = 100k?
R4 = 22k?
R5 = 56k?
R6 = 470?
R8,R9 = 12k?
R11 = 10?
R12,R37 = 2k?7
R13,R16 = 1k?5
R14,R15,R31 = 4k?7
R17,R19,R21,R24,R38 = 1k?
R18 = 270? 5W
R20,R23 = 270?
R22,R25 = 6?8 5W
R26 = 330k?
R27,R36,R42 = 1M?
R28 = 100?
R29,R30,R34 = 10k?
R32 = 15k?
R33 = 3k?3
R39,R40 = 15?
R41 = 1?5 5W
P1 = 470k? preset
P2 = 1? preset
Capacitors:
C1,C9 = 47µF 25V radial
C2,C3,C8,C10,C11,C12,C14,C15,C17,C18,C20 = 100nF
C4 = 1µF MKT (Siemens), lead pitch 5 or 7.5mm
C5 = 2nF2
C6,C7 = 220pF
C13 = 220µF 25V radial
C16 = 220nF
C19 = 2200µF 25V radial
Semiconductors:
D1 = 8V2 0.4W
D2-D5 = 1N4148
T1,T8 = BC557B
T2,T9 = BC547B
T3,T5 = BD140
T4,T6,T10,T11 = BD139
T7,T12 = BUZ11
IC1 = TS922IN ST (Farnell)
IC2 = LM331N
IC3 = 4013
IC4 = TLC556
Miscellaneous:
JP1 = 2-way pinheader with jumper
K1 = 3-way PCB terminal block, lead pitch 5mm
K2,K3 = 2-way pinheader
LS1 = 2-way PCB terminal bock, lead pitch 5mm
Piezo tweeter type PH8 (Visaton)
F1 = fuse, 1.5A, fast acting, with PCB mount fuse holder
High intensity LEDs (not on PCB), e.g., Sharp Super-luminosity LED
Lamp type GL0ZS042B0S (Conrad Electronics # 18 30 08)
2 spade terminals, PCB mount using 3-mm bolts and nuts
PCB, order code 020110-1

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