🚀 go-pugleaf

>I'm looking for the schematics to a simple chase-light circuit, 
>or anything else that might be neat to hook up to the 9 lamps in 
>my 9-line ATTfone...
>    -Dorian->
>|\  /\  \ ARPAnet: dorian@eddie.mit.edu

I.  Very easy "blinkie" do-nothing machine:  Connect blink-LED in 
series with normal LEDs to make all blink together. Red blinker 
in series with yellow and green normal LEDs works with a 9v 
battery; no current-limit resistor needed.  Connect several such 
series-strings in parallel and arrange the LEDs randomly over the 
surface to be decorated.              [designed by Duke McMullan]


II.  DUAL SEQUENTIAL FLASHER             [designed by Chuck Lane]

555 drives two J-K flipflops in 7473 arranged in series as freq. 
divider (Q output of one connected to C input of other, all J and 
K inputs to Vcc).  Three lines (555 output, Q outputs of both 
flipflops) go to A,B,C inputs of 74145 10-line decoder; input D 
is grounded.             
               Power connections:  Vcc     gnd
                         --------|-------------
                            555  | 4,8      1
                           7473  |   4     11
                          74145  |  16      8

Each of 74145 outputs 0 thru 7 go to two parallel LEDs (select 
LED pairs for equal brightness in parallel; use clear, undiffused 
LEDs).  Outputs 8 and 9 are unused.  All LED anodes are in 
parallel and connected to +5v thru 47 ohm 1/4w resistor. Adjust 
555 frequency as desired; I used 10k from pin 7 to Vcc, 1M 
between pins 6 and 7,  0.1uf capacitor from pins 6&2 to ground.

Arrange LEDs in two sequential strings around a border, such that 
the two LEDs illuminated at any instant appear to be chasing each 
other:
                          <-- rotation
                      4    3    2    1   0
                      5                  7
                      6 <your name here> 6
                      7                  5
                      0    1    2    3   4

I used this circuit in an animated name-tag holder for 
conventions. ICs are on back of a piece of "universal" p-c board, 
battery holder goes in shirt pocket.

Power supply: Four alkaline AA cells in series with 10 ohm 1/4w 
resistor.  When circuit begins to fail from battery depletion, 
connect shorting jumper across resistor.  Battery life is at 
least 10 hours.

--

Frank     W9MKV
reid@gold.bacs.indiana.edu
bitnet: reid@iubacs