Logic Question
Moderator: Queue Moderator
Logic Question
Does anyone have a cheap way to convert A logic Low into a chasis ground so I can turn a repeater on/off with a st809 dtmf decoder I am trying to wire this to a r1225 to enable and disable the repater over the air any suggestions
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jackhackett
- Posts: 1518
- Joined: Tue Jun 10, 2003 8:52 am
I don't know how your knowledge of electronics is, but I'll give a brief answer, if need be someone can fill in more details.
P
robably a couple of transistors would do it, an NPN with the emitter to ground, collector to whatever you're trying to pull to ground, then to get it to turn on with a logic low you'd drive the base with a PNP transistor as an inverter.
Cost wise probably under a dollar.
P
robably a couple of transistors would do it, an NPN with the emitter to ground, collector to whatever you're trying to pull to ground, then to get it to turn on with a logic low you'd drive the base with a PNP transistor as an inverter.
Cost wise probably under a dollar.
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TWEMARS
- Posts: 27
- Joined: Sun Feb 26, 2006 10:24 pm
- What radios do you own?: More than you can ever imagine
Re: Logic Question
There's an INPUT pin option in the RSS, accessory pins for repeater disable.
I have a Halcyon TIMS. It has an audio spectrum analyzer.
I have an IFR 1200. It has an audio distortion analyzer.
I can test and alter the audio response and distortion of my analog radio system to make it sound better.
I have a pair of socks.
Why would I want to put them in my mouth just so I could sound like I'm using a DMR radio?
I have an IFR 1200. It has an audio distortion analyzer.
I can test and alter the audio response and distortion of my analog radio system to make it sound better.
I have a pair of socks.
Why would I want to put them in my mouth just so I could sound like I'm using a DMR radio?