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Simple Bat Detector

Inexpensive, sensitive and easy to build

Simple Bat Detector
Various animal welfare associations everywhere in Europe have designated 2011 as the Year of the Bat. Their aim is to enhance public awareness of these flying mammals, which are unfamiliar and surrounded by mystery for many people. Bats hibernate at this time of year, but this gives you time to build this simple bat detector so that you will be prepared to go on safari for bat sounds in the spring.
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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor 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. Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

Resistors
R1 = 10Ohm
R2 = 1.3kOhm
R3 = 150kOhm
R4,R7,R9 = 1kOhm
R5 = 560kOhm
R6 = 10kOhm
R8 = 470kOhm
R10 = 100Ohm
R11,R12 = 47kOhm
P1 = 22kOhm preset, vertical mounting
Capacitors
C1 = 220nF MKT, lead pitch 5mm
C2,C3 = 47nF MKT, lead pitch 5mm
C4 = 220µF 16V radial, lead pitch 2.5mm
C5 = 2.2nF MKT, lead pitch 5mm
C6 = 1.5nF MKT, lead pitch 5mm
C7,C12 = 100pF ceramic, lead pitch 5mm
C8 = 1nF MKT, lead pitch 5mm
C9,C10 = 470pF ceramic, lead pitch 5mm
C11 = 100nF MKT, lead pitch 5mm
C13 = 33nF MKT, lead pitch 5mm
C14,C15,C16 = 100µF 25V radial, lead pitch 2.5mm
Semiconductors
D1,D2 = 1N4148
T1 = BC337-40
IC1 = LM386N-3
IC2 = TL074CN
IC3 = 4024
Miscellaneous
REC1 = 40kHz ultrasonic sensor (receiver) (e.g. Prowave 400SR16P, diam. 16 mm)
LS1,S1,BT1 = 2-pin pinheader, lead pitch 0.1 inch (2.54mm)
3 pcs 2-pin connector (for loudspeakers, switch and battery)
LS1 = loudspeaker 8Ohm/0.3W, diam. 20mm (e.g. Kingstate KDMG20008)
S1 = slide switch, 1 make contact
BT1 = 9V battery with clip–on lead
PCB # 110550-1 (see www.elektor.com/110550)

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