The New Generation Of 12-Volt DC Relays
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Forum Discussion
You mentioned the Opto-isolator
For my digital adapter for my ham radio I wished to completely DC isolate the Computer and radio side.
Thus both transmit and receive audio pass through transformres
But what of the keying line (PTT)? Opto isolator (home made) consisting of an I/R LED and an I/R Photo Transistor and a LED indicaator and a switch
Circuit as follows
Computer RS-232 out (Via FTDI USB Adapter) to LED assembley and I/R diode (This way I have a visual indication of when the computer wants to talk)
Switch in series with Opto-transistor to Transmitter KEY line and ground.
This way I can DISABLE the computers ability to key the rig (Safety/testing feature).
Works great.
For my digital adapter for my ham radio I wished to completely DC isolate the Computer and radio side.
Thus both transmit and receive audio pass through transformres
But what of the keying line (PTT)? Opto isolator (home made) consisting of an I/R LED and an I/R Photo Transistor and a LED indicaator and a switch
Circuit as follows
Computer RS-232 out (Via FTDI USB Adapter) to LED assembley and I/R diode (This way I have a visual indication of when the computer wants to talk)
Switch in series with Opto-transistor to Transmitter KEY line and ground.
This way I can DISABLE the computers ability to key the rig (Safety/testing feature).
Works great.
