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- Newsgroups: sci.electronics
- Path: sparky!uunet!usc!rpi!newsserver.pixel.kodak.com!laidbak!tellab5!mcdchg!mcdphx!schuch
- From: schuch@phx.mcd.mot.com (John Schuch)
- Subject: Re: chaser lights
- Message-ID: <1992Nov4.151022.10680@phx.mcd.mot.com>
- Sender: news@phx.mcd.mot.com
- Nntp-Posting-Host: bopper2.phx.mcd.mot.com
- Organization: Motorola Computer Group, Tempe, Az.
- References: <1992Oct30.194327.841@phx.mcd.mot.com> <1992Oct31.222606.5830@mtu.edu>
- Distribution: usa
- Date: Wed, 4 Nov 1992 15:10:22 GMT
- Lines: 20
-
- In article <1992Oct31.222606.5830@mtu.edu> cmwolf@mtu.edu (christopher m. wolf) writes:
- >schuch@phx.mcd.mot.com (John Schuch) writes:
- >>In article <1992Oct22.143703.6299@sactoh0.sac.ca.us> jhp@sactoh0.sac.ca.us (Jim H. Puga) writes:
- >>>I understand I missed an article about how to build chaser lights
- >>
- >>Build an oscillator with an LM555, connect to output to a 7493
- >>TTL binary counter, connect the BCD output to a 74154 TTL BCD to
- >>1 of 16 decoder, connect the outputs of the 74154 to solid state
- >>relays starting with output 1, connect the first unused output
- >>from the 74154 to the reset input of the 7493.
- >>
- >
- >How about using SCRs or TRIACs instead of relays, much quieter when I built
- >one. (SCR/TRIAC + optoisolator for each output)
-
- Agreed, and much cheaper to build.
-
- John
-
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