Saturday, August 8, 2015

Upper Console DPDT Latching Rockers DTMF Tone Request

Here is a little something we are working on to add a little more flash to the Upper Console. The momentary switches are simple enough to have request a random DTMF tone from the Voice Box, but for latching switches this is a lot more complicated. So what we have here is a circuit scenario that makes use of a few simple components to achieve just that. This scenario makes use of the 555 timer IC chip to send a short one second pulse to the Voice Box's DTMF tone generator which is roughly about the same as a momentary button. In this diagram I have 2 mapped out for simplicity but essentially you would continue the pattern for each DPDT Rocker Switch. The LED indicator lights board is optional but I like it. On the indicator board I have green LEDs and red LEDs that would each light up for about a second when each corresponding Rocker Switch has been turned on, also a short signal is sent to the Voice Box to request the random DTMF tone.

IMPORTANT NOTE:

There are a few errors in the 555 Timer circuit above, also this new one has been simplified a little eliminating one Capacitor and swapping out a Resistor for a Variable resistor. Out side of that just swap out the Piezo Buzzer for your LED connection. :)