• Document: BUILD YOUR OWN RC SWITCH (Issue 3)
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BUILD YOUR OWN RC SWITCH (Issue 3) PART ONE – SINGLE ELECTRONIC RC SWITCH Fancy switching the lights using your radio, then here is a circuit you may consider building. It only uses one IC and seven other components for a single switch and you can build two or three to run from one output channel of your receiver, which will allow you to switch the navigation lights, cabin lights and deck flood lights of your vessel in sequence. The circuit for the RC switch is by Tony Van-Roon and was found on the internet at DiscoverCircuits.com it is an adaptation from an original circuit by Ken Hewitt. The circuit is a so-called "Radio Controlled Electronic Switch". It can be used to switch on/off anything electrical. The schematic diagram in Fig 1 shows the setup for switching general accessories such as motors, relays, navigation lights, landing gear, sound systems, glow plug driver, bomb release, parachute, search lights, gyros, and so on. Please note that this system will not work with PCM. Technical Description The circuit is based on a CMOS Dual ‘D’ Flip-Flop integrated circuit type 4013. The input Flip-Flop is designed as a monostable pulse generator by means of R1, P1 and C1 connected between 'Q' and the RESET input, which produces a preset pulse-length set by the adjustable potentiometer (100k) and starts at the rising edge of the input pulse from the receiver. When this monostable times out its inverted 'Q signal goes high and clocks the output stage of the Flip-Flop, which is used as a normal type 'D, to sample the input pulse. If the duration of the input pulse is longer than the preset monostable pulse, then a logic high level will be clocked to the output of the D type. A shorter input pulse will cause a logic low to be clocked to the output. In short, both halves of the IC perform two different logic functions. The IC output (pins 12/13) drive the output device which in this circuit is the IRF540A MOS FET it needs only 2 volts on its gate to fully turn-on and has an ‘ON’ resistance of only 0.028 ohm. To invert the operation of the R/C switch, you can connect R2 (1k0) to either pin 12 or 13 of the 4013. Please note that the system switches the negative or ground side of the supply and the positive supply is permanently connected to the device being switched. This device can be built as a single switch or two/three switches on the same board. It is easy to build and can be made using Strip Board, or a specifically design PCB layout. 5v dc Output 2 11 14 5 12 13 Connect to either pin for Invert/Non-invert outputs 3 4013 6 RC Input 9 8 1K0 IRF540A 0.47 1 10 4 7 47K0 100K0 10K0 22nf 0v Fig 1 Schematic Diagram of Single RC Switch Page 1 of 8 BUILD YOUR OWN RC SWITCH (Issue 3) Note: The 100k potentiometer sets the trigger point at which the circuit will switch on. Only one 0.47uf decoupling capacitor is required per circuit board irrespective of the number of switch circuits built on the board Switch Construction The Printed Board track and component layout for a single switch is shown in Fig 2. Output (5volts) Input 5v in Earth Fig 3 Switch PCB Component Layout (Scale 2:1) PCB actual size 42 x 24mm see Fig 4. Fig 4 PCB Master (Scale 1:1) for the list of components see appendix A. If you intend to make a printed board in order to construct your switch, you will need some pre- sensitised PCB material and Caustic Soda for developing. Then you will need to etch the copper to form the tracks using Ferric Chloride. If you do not wish to play around with chemicals, you could build your switch using Strip /Matrix Board (Vero Board). A board layout indicating where to cut the copper tracks is shown in Fig 5 (scale approx. 2:1) all that is required is that you cut the strips of copper where m

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