I have a project in my college that requires me to make an SOS (... --- ...) buzzer without any IC's, what are the possible components that I can use for the delay between the morse code signals? Thanks in advance.
I need to make a circuit that activates an SOS buzzer, what are the components that I need? [closed]
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1\$\begingroup\$ Would be tough without any IC. \$\endgroup\$Eugene Sh.– Eugene Sh.2021-11-09 19:54:12 +00:00Commented Nov 9, 2021 at 19:54
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2\$\begingroup\$ Please be more specific about where you are stuck in the process of solving this project/task. Right now the question is too broad and cannot be answered. Is the sound to be played by a speaker, a buzzer which just needs a constant voltage and how did morse code suddenly become a part of this? \$\endgroup\$Jakob Halskov– Jakob Halskov2021-11-09 19:55:39 +00:00Commented Nov 9, 2021 at 19:55
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\$\begingroup\$ @EugeneSh. an oscilator can easily be made without integrated circuits (ICs). \$\endgroup\$Jakob Halskov– Jakob Halskov2021-11-09 19:56:26 +00:00Commented Nov 9, 2021 at 19:56
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3\$\begingroup\$ @HoleWizard. I thought no ICs!?!? \$\endgroup\$Math Keeps Me Busy– Math Keeps Me Busy2021-11-09 20:30:42 +00:00Commented Nov 9, 2021 at 20:30
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1\$\begingroup\$ A single 555 probably won't help too much. \$\endgroup\$Eugene Sh.– Eugene Sh.2021-11-09 20:37:35 +00:00Commented Nov 9, 2021 at 20:37
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1 Answer
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You can simply use a couple astable multivibrators and a ring counter with some diodes to create the pattern:
The circuit I used has 61 transistors, a bit more than 200 components, and is probably far from optimal, but easy to create with copy/paste.
Yours will, no doubt, be unique and different from this (deliberately unreadable) one.
answered Nov 9, 2021 at 22:29
Spehro 'speff' Pefhany
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