Simple Bat Detector
Inexpensive, sensitive and easy to build
Materials
Gerber file
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Component list
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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