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- Path: sparky!uunet!olivea!spool.mu.edu!agate!doc.ic.ac.uk!uknet!jet!ps10
- From: ps10@jet.uk (Paul Simmonds)
- Newsgroups: sci.electronics
- Subject: Re: Headlight Reminder Circuit Wanted
- Keywords: Idiot Reminder
- Message-ID: <1992Nov5.084352.12750@jet.uk>
- Date: 5 Nov 92 08:43:52 GMT
- References: <davej.40.0@gmuvax2.gmu.edu> <1992Nov3.220234.23476@u.washington.edu>
- Organization: Joint European Torus
- Lines: 48
-
- In <1992Nov3.220234.23476@u.washington.edu> whit@carson.u.washington.edu (John Whitmore) writes:
-
- >In article <davej.40.0@gmuvax2.gmu.edu> davej@gmuvax2.gmu.edu (David F. Juraschek) writes:
- >>This is probably a very beat up old horse, but does anyone have a
- >>simple circuit they could post for an automobile headlight reminder
- >>circuit?
-
- > The standard trick is to connect from the switched +12V
- >on the instrument panel to the (+) lead of the headlamps; if
- >the headlamp terminal is more positive than the switched +12,
- >a buzzer (low-current type, connected in series with a diode)
- >goes off. The buzzer has to be a low-current type because the
- >current it draws is set by the quiescent draw of the instrument
- >panel, which is the current sink for the circuit.
-
- > Auto shops often sell a small kit for this purpose,
- >complete with fuse-block connectors and instructions.
-
- > John Whitmore
-
- A better solution is to go from the +12 Switched sidelight feed, via a
- buzzer to the drivers door light switch, you then need to put a diode in the
- door circuit to stop the other doors operating the buzzer.
-
- +12v (sidelights)
- |
- +----+
- | | Buzzer (12v)
- +----+
- |
- +-------|<|-------- To existing drivers interior light switch
- | Diode
- |
- O
- ----| Drivers door switch
- O
- |
- Car Chassis
-
- Thus when you leave your lights on *AND* open the drivers door, the buzzer
- sounds. If you mean to leave your lights on, just shut the door and the
- buzzer stops!
-
- Paul Simmonds (ps@jet.uk)
-
-
- - Disclaimer: Please note that the above is a personal view and should not
- be construed as an official comment from the JET project.
-