G'day all,
I want to build a radio remote control for a GPO. (Reason: I have built a capstan winch to haul a caravan up my driveway, and want to be able to turn the winch on and off while I steer the van at a range of up to 35 metres.)
My neighbour has given me a radio remote unit (transmitter / receiver) which has more than enough range, and has an output signal of 3.6V, almost square wave, roughly 0.7 seconds long. The signal looks very clean on a CRO.
He also gave me the details on a CD4013 Flip Flop which should latch 'ON' or 'OFF' an output to a 240V relay, as set out in the attached circuit.
The circuit is not reliable.
We have tried a number of modifications - adding capacitors here and there around the 4013, changing resistor values etc, but nothing makes sense. Sometimes the unit will change output state, but not always. Sometimes it will change state and then immediately change back. Sometimes there is a noticeable delay before the change of state, but the 4013 should activate almost immediately on rising voltage input (from the radio output).
We cannot find anything wrong with the finished board. I even bought another 4013 and set it uo on a breadboard with minimal adjacent components - still no reliable operation.
Can any of you suggest circuit errors, things to try etc?
Thanks in advance.
cheers,
glids
I want to build a radio remote control for a GPO. (Reason: I have built a capstan winch to haul a caravan up my driveway, and want to be able to turn the winch on and off while I steer the van at a range of up to 35 metres.)
My neighbour has given me a radio remote unit (transmitter / receiver) which has more than enough range, and has an output signal of 3.6V, almost square wave, roughly 0.7 seconds long. The signal looks very clean on a CRO.
He also gave me the details on a CD4013 Flip Flop which should latch 'ON' or 'OFF' an output to a 240V relay, as set out in the attached circuit.
The circuit is not reliable.
We have tried a number of modifications - adding capacitors here and there around the 4013, changing resistor values etc, but nothing makes sense. Sometimes the unit will change output state, but not always. Sometimes it will change state and then immediately change back. Sometimes there is a noticeable delay before the change of state, but the 4013 should activate almost immediately on rising voltage input (from the radio output).
We cannot find anything wrong with the finished board. I even bought another 4013 and set it uo on a breadboard with minimal adjacent components - still no reliable operation.
Can any of you suggest circuit errors, things to try etc?
Thanks in advance.
cheers,
glids