I've built siren circuits using 555/556. Great two tone.
Trouble is I'm almost finished with a model fire truck of 2001 era and the modern equivalent 'yelp / wail / warble' is beyond me!
Does anyone know how I might start to get a handle on this?
I've thought of buying a 'blank' greetings card module and then putting a wav file onto it. But, 1) I can't find 'blank greeting card sound modules; and 2) Don't have a clue how to put the sound onto the chip anyway!
Previous help means I've got the knightrider LED sequence spot on, the blue lamps, head lamp, hazards are all working great. Just this last bit to go.
Trouble is I'm almost finished with a model fire truck of 2001 era and the modern equivalent 'yelp / wail / warble' is beyond me!
Does anyone know how I might start to get a handle on this?
I've thought of buying a 'blank' greetings card module and then putting a wav file onto it. But, 1) I can't find 'blank greeting card sound modules; and 2) Don't have a clue how to put the sound onto the chip anyway!
Previous help means I've got the knightrider LED sequence spot on, the blue lamps, head lamp, hazards are all working great. Just this last bit to go.