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Remote Power On Switching?

Roger Thompson AD5T
Roger Thompson AD5T Member ✭✭
The 6000 series hardware manual calls for shorting the remote power on center pin to ground to power up the radio, a pin that measures about 3.3 volts DC when open.  I see discussions about pulling this pin to ground using a relay, but am curious if anyone has successfully used an optoisolator like a 4N25 or an open collector transistor switch? 


  • WX7Y
    WX7Y Member ✭✭✭✭
    edited June 2020
    I'll bet if those two transistor devices you mentioned don't put down far enough to cause the remote power to turn on a FET 2N7000 will work just fine, the 2N7000 FET junction pull down to ground with a lot less resistance in the gate then a transistor. 
    The FET doesn't require any more components then a open collector transistor depending on what your using to use to switch the device from HI to LOW if it happens to be inverted then it will require 2 devices and a pull up resistor just like a transistor. 


  • IW7DMH, Enzo
    IW7DMH, Enzo Member ✭✭
    edited January 2017
    Hello Roger, in my last project I am using a 4N35 with success. I drive it using a Arduino Due digital pin through a 220 ohm resistor. In the same project I use another 4n35 to key the rig using the accessory port. It is very fast and totally silent. 73' Enzo iw7dmh
  • k3Tim
    k3Tim Member ✭✭✭
    edited May 2020
    From teh 4N25 datasheet, the Collector to Emitter saturated (CEsat) will be less than 0.20 Volts. This should easily control the 3.3V-DC input, pulling it low. The drive current of the LED (50 mA) should be noted.

    Good Luck,


  • IW7DMH, Enzo
    IW7DMH, Enzo Member ✭✭
    edited January 2017
    Just FYI,

    I want to highlight the Orion G3NA solid state relay.
    I am using it for my remote AC switch and I can drive it using a straight output Arduino port (@5V).
    G3NA relays are rated for different input voltages (5-24VDC) and for different output loads (5 to 90A @ 24-240VAC) .
    They are used for a lot of domotic applications and it seems they are very reliable.

    73' Enzo


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