Hi Arnie:
Sure, Zeners are voltage regulators...can be used in parallel or series. A
resistor can be used also, but the lamp is already a resistor, so a voltage
drop of about 5V will give the lamp it's intended 8V +/- a volt or so.
Either will work. A
zener is a more precise voltage drop is all.
Tim Economu
Design Engineer
-----Original Message-----
>From: Arnold Molloy <a.j.molloy@worldnet.att.net>
>To: Tim Economu <economu@whidbey.com>
>Cc: MG List <mgs@autox.team.net>; mgbob@juno.com <mgbob@juno.com>
>Date: Monday, November 08, 1999 6:02 PM
>Subject: Re: Halogen dash lights
>
>
>>Tim;
>>Maybe modern electronics is similar to modern math????? But back in the
>50's
>>when I went to school a series resistor was used to drop the excess
>voltage,
>>(5-6V) and the zener (in this case 7.5V) was placed across the load
>(parallel)
>>to determine the voltage applied. IMHO
>>
>>Arnie Molloy 53 TD
>>
>>
>>Tim Economu wrote:
>>
>>> Dear Bob, Jay, et al:
>>>
>>> If you want to use your 7.5V bulbs and have them last a long life, just
>add
>>> a 5.1V zener diode in series with the bulb to drop the other few volts.
>The
>>> bulbs will last the normal 2000 operating hours (their rating) and you
>will
>>> still get a nice bright bulb. The zener can also be purchased at Radio
>>> Schlock (misspelling on purpose!) and will be soldered into the circuit
>with
>>> the band end (cathode) toward the plus side of the battery on neg ground
>>> systems.
>>>
>>> But really, isn't the dim instrument good for all of us? And some LBC's
>have
>>> REOSTATS!! Wow modern technology!!
>>>
>>> Kind regards,
>>>
>>> Tim Economu
>>> '69 BGT mona
>>> email: economu@whidbey.com
>>>
>>> > It was previously said....
>>>
>>> Date: Sun, 7 Nov 1999 17:34:24 -0500
>>> From: Bob Howard <mgbob@juno.com>
>>> Subject: Re: Halogen dash lights
>>>
>>> Jay,
>>> I was one of the guys who contributed to the Radio Shack bulb
>>> correspondence.
>>> Experimentation with the 7.5 volt bulb (#50) demonstrated great
>>> illumination, so bright that the rheostat could be turned down almost to
>>> the miniumum
>>
>
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