Parts List
component description/value

SG1 Ultrasound transducer (receiver), 40 khz
SPK1 Audio speaker
IC1 CD4069 Hex inverter
IC2 LM386 Audio amplifier
D1, D2 1N4148 High speed small signal diodes
R1 1 kohm Resistor 1/4 Watt, 5%
R2, R3, R5 1 Mohm Resistor 1/4 Watt, 5%
R4 100 kohm Resistor 1/4 Watt, 5%
R6 470 ohm Resistor 1/4 Watt, 5%
R7, R8 470 kohm Resistor 1/4 Watt, 5%
R9 10 kohm Resistor 1/4 Watt, 5%
R10 10 ohm Resistor 1/4 Watt, 5%
VR1 010 kohm Variable resistor
VR2 0200 kohm Variable resistor
C1, C2, C3, C7 0.01 uF Ceramic capacitor, 25V
C4 20 pF Ceramic capacitor, 25V
C5 220 uF Electrolytic capacitor, 16V
C6, C13 0.04 uF Ceramic capacitor, 25V
C8, C9 0.022 uF Mylar capacitor, 50V, +/ 10%
C10, C11 100 pF Ceramic capacitor, 25V
C12 100 uF Electrolytic capacitor, 16V
C14 10 uF Electrolytic capacitor, 16V
C15 47 uF Electrolytic capacitor, 16V
