[sci.electronics] Help needed with voltage controlled delay circuit

v097pba8@ubvmsd.cc.buffalo.edu (Ken F Morton) (02/07/91)

	I'm working on a drum pad interface and I thought this sub heading
might prove more definitive of the project on this group.
	What I need is a circuit that will take voltage from a piezo element
and 1) Close a contact immediately 2) Close another contact after a delay
period related to the voltage of the trigger signal.  This delay will be
very small, I'm sorry I can't give the range in microseconds, it's less
than one second.

	Anyone have any ideas?

	It must be a *very* responsive circuit.


				Thanks...


				Ken Morton

				v097pba8@ubvmsd.cc.buffalo.edu

grayt@Software.Mitel.COM (Tom Gray) (02/12/91)

In article <58290@eerie.acsu.Buffalo.EDU> v097pba8@ubvmsd.cc.buffalo.edu writes:
}
}	I'm working on a drum pad interface and I thought this sub heading
}might prove more definitive of the project on this group.
}	What I need is a circuit that will take voltage from a piezo element
}and 1) Close a contact immediately 2) Close another contact after a delay
}period related to the voltage of the trigger signal.  This delay will be
}very small, I'm sorry I can't give the range in microseconds, it's less
}than one second.
}
}	Anyone have any ideas?
}

As always a 555 set up as a monostable will do this. Reset the 555 with the
sample pulse and use the sampled voltage as the reference signal to the 555.