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Subject: Re: Schematic needed for a timimg circuit that will fire 32 LEDs in sequence
X-Newsreader: Microsoft Outlook Express 5.50.4920.2300
Date: Wed, 27 Nov 2002 20:40:29 GMT
NNTP-Posting-Date: Wed, 27 Nov 2002 20:40:29 GMT
Organization: Ireland On-Line Customer
Probably the easiest way to do this is to use :
1. a clock ... many ways to achieve this including 555 astable.
Driving a divide by 4 counter. followed by a divide by 2 counter
2. 2 off of 4 to 16 line decoders e.g. in the TTL range the 74150 would be
Asingle LED in series with a 470OHM resistor to be connected between each
of the 16 outputs and ground
The four address lines of the 4:16 line decoders are Driven by the 4 bit
The Enable line of the 4:16 decoder is attached to the output of the divide
by two counter Such that only one of the two decoders is enabled at any
This should allow a travelling light down the 32 leds.
"johnm" wrote in message
> Hello All,
> Let me start with some background...
> Over the past several days there have been some posts on the
> rec.models.scale newsgroup regarding a lighting circuit that runs on a
> 9V DC battery and fires off 32 LEDs in sequence. The circuit is used
> in a model of the old "Lost In Space - Jupiter 2" space ship to
> simulate the engines. Anyone over 40 will remember the television
> show and hopefully understand what I mean.
> Unfortunately, the manufacturer of the ciruit has either gone out of
> business and/or discontinued the production of the circuit.
> So, that brings me to the reason for this post...
> Several of my fellow modelers over at rec.models.scale would like to
> be able to re-create the lighting effect. However, with the lighting
> circuit no longer produced we are out of luck.
> So, I would like to ask the group if anyone could post a schematic for
> a timimg circuit that would fire off 32 LEDs in sequence and run off a
> 9V DC Battery.
> Thanks in advance
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