dorian@bu-cs.BU.EDU (Dorian Garson) (07/26/88)
Greetings!
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 (It's been converted for homestyle 2-line modular plug use,
so the 1A2 is just sitting there...) I have the connector all set up, with
the proper wires stripped, and I can't find my schematics. I'm no EE
hacker, so I cannot hope to figure it out myself.
It'll be really cool when finished -- I'm designing it to be small so it
can be easily unplugged from the 1A2 and snapped onto any old 9-liner.
Thanks 10^6!
-Dorian->
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|/ \/ / FrEDnet: njmcsip!argo!DGarsoncommgrp@silver.bacs.indiana.edu (07/27/88)
>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
al@cs.strath.ac.uk (Alan Lorimer) (07/29/88)
In article <7200002@silver> commgrp@silver.bacs.indiana.edu writes: > > > >>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... . . >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. How about CD40106 based 1 invertor clock driving the input of a CD4017 decade counter. The outputs of the decade counter go to leds ( connect several leds in series to each channel if necessary - it doesn't cost any more to run. Add a single 270ohm or so currenlt limiting resistor in the common line of all the leds and away it goes. Total cost is 2 chips, 2 resistors and 1 capacitor. Battery life in this case is at least a week continuous, from a PP3 alkaline cell. I used this circuit built into a tie for a "White Shirts and Fancy Ties Party" driving a total of 16 leds ( 8 channels 2 leds/channel) It has been borrowed by several friends and is frequently left on all night - and it *Still* hasn't needed a new battery in over a year's party going. For installation in a telephone, this could be good, since a simple power supply compising a diode, zener diode, resistor and capacitor will make it work from the line's ringing volts. Some experimentation might be necessary to stop the circuit holding the line on a hangup. The 4017 will handle up to 10 channels, so it should be ideal for your 9 light telephone. Alan. -- ____________________________________________________________________________ Alan G. Lorimer, Strathclyde University, 26 Richmond Street, Glasgow G1 1XH. UUCP: ...!seismo!mcvax!ukc!strath-cs!al DARPA: al%cs.strath.ac.uk@ucl-cs JANET: al@uk.ac.strath.cs