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Re: Audible buzzer

To: Trevor Jordan <trevor.jordan@rmit.edu.au>
Subject: Re: Audible buzzer
From: George Richardson <gprtech@ix.netcom.com>
Date: Wed, 08 Oct 1997 08:03:33 -0400
Cc: triumphs@Autox.Team.Net
Organization: Merlin Group Inc.
References: <v03110703b05f6ab47386@[131.170.185.4]> <v03110702b060dc9b2317@[131.170.185.4]>
Trevor Jordan wrote:
> 
> >If the TR6 turn signal indicator lamp is connected both the left and
> >right turn signals, then the solution is to use 2 diodes with the
> >buzzer. Any 2 diodes will do.
> >
> >Connect the anode of the first diode to one side of the lamp. Connect
> >the anode of the seconde diode to the other side of the lamp. Connect
> >the cathodes (banded ends) of both diodes together and to the red wire
> >(positive side) of the buzzer. Connect the black wire (negative side) of
> >the buzzer to ground.
> >
> >The diodes will steer current (they're called steering diodes in such an
> >application) from the side of the lamp that has positive voltage (if
> >any) to the buzzer without bypassing the lamp.
> >
> >--
> >George Richardson
> >'57 TR3, TS15559L
> >(getting ready to paint - and now on the web!)
> >http://www.merlingroupinc.com/tr3.htm
> 
> Thanks, this should be a much better configuration than my suggestion of
> using a bridge rectifier to connect the buzzer across the indicator lamp.
> It gives the buzzer a direct connection to ground, rather than through the
> opposite turn signal lamps, so that there is no need to worry about the
> effect of the voltage drop across those lamps on the operation of the 12V
> buzzer.
> 
> As you point out, it also will not shunt current from the indicator lamp;
> although it appears that this lamp has now been appropriated for a dozen
> other purposes.
> 
> Trevor Jordan
> 74 TR6 CF29281U

I'm sorry, I didn't see the message where you described the bridge
rectifier setup.

That would've worked well also.
-- 
George Richardson
'57 TR3, TS15559L
(getting ready to paint - and now on the web!)
http://www.merlingroupinc.com/tr3.htm

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