Batboard

Ok, so they had to use 5 volts as the control voltage on the ass of the trbo radios (could'nt be 12 volts).

I need to find a impulse relay that will work on 5 volt coil voltage. I am just looking to have dry contacts on the other end to open and close the ptt line of another radio(s) for linking purposes (on and off)

We need to be able to turn on/off three seperate radios with the trbo telem. Due to only three assignable buttons, I will have to use pulse command.

Any one have a lead or idea on this one.

Thanks, Rob

If active high isn't a must, you could go for active low on the TRBO and still use 12v relays.

Active high is not, as it is a pulse on/off application. Just flip flopping the realy. How would I utilize the 12 volt realy?

I can use 87 a to for normal operation, and when I send the command to shut it off, the realy would than move to 87, which would not be connected to anything. But how is 5 volts going to operate the coil?

Thanks, Rob

Mot standard design for years has been open collector outputs and opto-isolated inputs with at least 16v limits. Did they do something different with Trbo? If not, then you can put 12v at the top of a relay, and take it to ground through an open collector output.

Bill,

From what I can understand it is roughly 4.6 volts at 10ma. So if I understand what you are saying one side of the coil would be 12 volts + and the ground would pull from the radio. So if I am using active high, when voltage is present on the pin the realy would not be active. Then when I activate the pin and sink the voltage, that would provide ground for the relay?

If I am off, please explain what you meant earlier.

Thank you again for your continued help. Rob

FMROB wrote:Bill,

From what I can understand it is roughly 4.6 volts at 10ma. So if I understand what you are saying one side of the coil would be 12 volts + and the ground would pull from the radio. So if I am using active high, when voltage is present on the pin the realy would not be active. Then when I activate the pin and sink the voltage, that would provide ground for the relay?

If I am off, please explain what you meant earlier.

Thank you again for your continued help. Rob

Sinking voltage is what we are saying.

Apply 12v to one side of the relay, and the other side goes into the radio- programmed for "active low". When the the radio gets the signal to activate the pin, it will go to ground and activate the relay.