tony-ellis
New Member
I have taken a single channel RC receiver from a simple rc car, which ran on 2 x 1.5v AA batteries. The output is red wire - pos, black wire - neg. These were originally connected to the motor causing the car to move forward. Press the transmitter and the polarity of the wires is reversed (red now becomes neg). This caused the car to go backwards.
I have connected the neg wire from the battery to a 5v reed relay and the black wire from the receiver to a common input on a bridge rectifier. I have connected the pos leg of the bridge rectifier to the relay. In the normal state, with neg going into the bridge rectifier, the relay is inactive. Press the transmitter, and the relay activiates, firing the camera. I have also linked a LED on the relay side of the bridge rectifier to indicate that the rc is operating ok.
My problem is that the relay will not function unless the batteries are absolutely fresh, and after a while in use the power drops. I thought of using a 9v pp3 battery but don't know how to regulate the voltage. An alternative would be perhaps to use a transistor, but I'm not sure how to connect it.
Any ideas.
Tony
I have connected the neg wire from the battery to a 5v reed relay and the black wire from the receiver to a common input on a bridge rectifier. I have connected the pos leg of the bridge rectifier to the relay. In the normal state, with neg going into the bridge rectifier, the relay is inactive. Press the transmitter, and the relay activiates, firing the camera. I have also linked a LED on the relay side of the bridge rectifier to indicate that the rc is operating ok.
My problem is that the relay will not function unless the batteries are absolutely fresh, and after a while in use the power drops. I thought of using a 9v pp3 battery but don't know how to regulate the voltage. An alternative would be perhaps to use a transistor, but I'm not sure how to connect it.
Any ideas.
Tony