Hello, I am building an alarm for a project on stripboard. The problem I have got is that I have only got a 1 tone noise coming from it, when obviously I should have a two tone noise - like an alarm. I have tested it on an oscilloscope, and multimeter. I have got power going to both of the 555 timers, but only got one square wave coming from the first of the 555 timers. I have tested the capacitor on the oscilloscope to see if it is charging and discharging which it is. What could the problem be? i have attached a picture of the circuit diagram and the schematic that I converted it to.
Hopefully you will be able to work out where I have gone wrong on my circuit diagram. Its not the best diagram in the world but please appreciate that this is my first ever attempt to convert a schematic diagram to a circuit diagram. Any feedback is appreciated,
Thanks.
Hopefully you will be able to work out where I have gone wrong on my circuit diagram. Its not the best diagram in the world but please appreciate that this is my first ever attempt to convert a schematic diagram to a circuit diagram. Any feedback is appreciated,
Thanks.