hi there please i am doing a project on an automatic multipurpose siren system that switches automatically b/w ambulance,police and fire brigade sounds. I discovered that a um3561 aound generator ic does thid but i do not know how to swith automatically b/w the three sounds though i have a schematic that produces these sounds using the ic it usese only a 2 pole 4 way switch to manually select the individual sounds no auto switching that cycles b/w the three. Any help enyboby it is almost late now oin fact i just need the schematic plus a manual option along with the auto if possible so one can select what u need as use requires.
please can anyone help
please can anyone help
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