Below is a schematic diagram of my canopy alarm. I realize that there are simpler circuits. I chose to use the CD4011 because I only had one wire going to the canopy switch and didn't want to run another one. Also, the CD4011 outputs 5 volts needed by the voice recorder. When activated, the voice recorder plays, "CANOPY OPEN". The pilot knows immediately what is wrong and does not have to figure out what an alarm light or buzzer means.
Van's Air Force
The definitive Van's Aircraft support community! Buying, building or flying an RV? Join our exclusive family of mentors and enthusiasts!
Canopy Unlatched Alarm
- Thread starter Mich48041
- Start date
Is the voice chip readily available and secondly what air switch would you use?The ISD1820 voice recorder is available on eBay for less than $5 U.S.A.
I bought an airspeed switch from Aircraft Spruce. Part Number ASW-1
My review of the switch is on Aircraft Spruce's website. Read it before purchase.
https://www.aircraftspruce.com/catalog/elpages/tcwairspeedswitch.php
The air pressure at 30 knots is equal to that of a 15mm water column (very low).
Blowing into the airspeed switch could damage it.
I bought an airspeed switch from Aircraft Spruce. Part Number ASW-1
My review of the switch is on Aircraft Spruce's website. Read it before purchase.
https://www.aircraftspruce.com/catalog/elpages/tcwairspeedswitch.php
The air pressure at 30 knots is equal to that of a 15mm water column (very low).
Blowing into the airspeed switch could damage it.
