限速警示电路

材料BOM表：

R1,R2,R19 1K 1/4W Resistors
R3-R6,R13,R17 100K 1/4W Resistors
R7,R15 1M 1/4W Resistors
R8 50K 1/2W Trimmer Cermet
R9 470R 1/4W Resistor
R10 470K 1/4W Resistor
R11 100K 1/2W Trimmer Cermet (see notes)
R12 220K 1/4W Resistor (see notes)
R14,R16 68K 1/4W Resistors
R18 22K 1/4W Resistor
R20 150R 1/4W Resistor (see notes)
C1,C7 100µF 25V Electrolytic Capacitors
C2,C3 330nF 63V Polyester Capacitors
C4-C6 4µ7 25V Electrolytic Capacitors
D1,D5 Red LEDs 3 or 5mm.
D2,D3 1N4148 75V 150mA Diodes
D4 BZX79C7V5 7.5V 500mW Zener Diode
IC1 CA3140 or TL061 Op-amp IC
IC2 4069 Hex Inverter IC
IC3 4098 or 4528 Dual Monostable Multivibrator IC
Q1,Q2 BC238 25V 100mA NPN Transistors
L1 10mH miniature Inductor (see notes)
BZ1 Piezo sounder (incorporating 3KHz oscillator)
SW1 SPST Slider Switch
B1 9V PP3 Battery (see notes)
Clip for PP3 Battery