| Part | Total Qty. | Description | Substitutions |
| C1 | 1 | 0.01uF Ceramic Disc Capacitor | |
| C2 | 1 | 100uF 35V Electrolytic Capacitor | |
| R1 | 1 | 1K 1/4W Resistor | |
| R2 | 1 | 10K 1/4W Resistor | |
| R3 | 1 | 15K 1/4W Resistor | |
| R4 | 1 | 470 Ohm 1/4W Resistor | |
| D1, D3, D4 | 3 | 1N4004 Rectifier Diode | |
| D2 | 1 | Red LED | |
| U1 | 1 | 555 Timer IC | |
| K1 | 1 | SPST 12V Automotive Relay | |
| MISC | 1 | Board, Wire, Socket For U1, Case | |
- This circuit is by bob and was originally posted to the forum as Need Circuit Project to Improve Remote Car Alarm.
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