Simple alarm
Overview
Simple Alarm Auto: Open SW0 turns on the alarm, door contacts SW1 to SW4 are normally closed out of the car you have a few seconds determined by R1, C1; Then if one opens a door has three seconds R2, C2 SW0 to operate before the relay activates an alarm; Once the relay is activated the closed doors do not stop the alarm, only SW0 closed position shuts off the alarm. (The SW0 contact can be a shunt on a DIN socket)
Technical aspects
- Supply Voltage: 12V
- Output: 12V Relay Contacts
- Contact SW0 hidden for cut or shunt with an outlet on dashboard
- Using the 555
Nomenclature
Designation
|
Amount
|
Reference
|
Description
|
| Resistors 470 k 1M 10k | 1 1 1 | R1 R2 R3 | 470k 1/4 W (yellow, purple, yellow) 1M ohm (black brown green) 10 k (orange brown) |
| Capacitors 10 uF 3.3 uF 10 nF | 1 1 1 | C1 C2 C3 | |
| NE555 circuit | 2 | IC1, IC2 | |
| Diode 1N4148 | 1 | D1 | |
| 2n2097 Transistor | 1 | Q1 | |
| Relais 12 V | 1 | R | 2 R inv. |
| Fuse wire AUTO Support | 1 | ||
| 1A Fuse | 1 | ||
| CI | 1 | VO01 PCB |
Nomenclature VO01M1.PDF
Housing
Recommended housing:
Cost
| Folder | Type |
Click
| Format |
Size
|
| VO01 Complete | All files |  | VO01.ZIP |
Options
| Documentation | Click | Format | Size |
| 555 NE | | NE555.PDF | 121 KB |