Safety Buzzer for Sailplane Winch Solenoid

The project aims to build a buzzer to a winch to create an audible alarm and modify the winch by creating two solenoids wired in series.

A simple circuit was designed which consists of 2 LEDs with series resistors. To indicate that its contacts are open, an LED is connected across each winch solenoid. A stuck solenoid would indicate a dark LED. The addition of the buzzer produces a sound at any time when either solenoid is closed by itself.

A 12V battery or power supply is used to test the device on the bench where the red wire (battery side) is connected to +12V and the brown wire (motor side) to ground and both LEDs should light. The buzzer should sound when the red light turns OFF and the green light gets brighter by touching the orange wire to the red wire or +12V.

A stuck solenoid can be simulated by installing the device on the winch. It can be tested by connecting the input to the output of either solenoid using a clip-lead or jumper wire. Only one solenoid is ensured to be bridged at a time.

Rest of the project