broken link removed Here is the part of the circuit in question. (Of course, it doesn't upload. Why not?)
As you can tell, I am not an electronic engineer (I'm having to act as if !).
I get told to "look at the Data Sheet" (1c4093) and the Truth Table. This is what I suggest, in order to get a positive square wave output of specific time (RC x ln V-v /V @ 25 deg C etc) from Pin 4.
The table suggests that if 5 and 6 are opposite, 4 will be positive.
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The ic4093 is set with +5v at pin 14, O v at pin 7.
Below, please imagine B gets a dropped voltage from 5 v to zero, as a sensor (to the left of A) closes a circuit to ground. A is fixed at 5 v. Then, there should be a + ve signal from Q1 (pin 3).
Now, below, this is the second
gate (if thats the right word). I'm sorry I am stuck with
A and
B again, but please imagine its the independent
second gate in the 4093.
Q1 (pin 3 on the ic 4093) goes to second
B, below, via a 15 nf cap, then thru 47K R to O v.
The second
B, pin6 goes to O v.
So pin 4, the second Q2 should be a timed + pulse.
Is this correct? Thanks in advance.
Malc