Don't like squinting at a meter movement when you're trying to adjust an antenna coupler?
Why not make it audible?
That means the pitch drops to nothing as you approach 1:1 VSWR.
Here is a simple 555-based voltage controlled audio oscillator (designed by Drew Diamond VK3XU) that can be connected across the meter movement of a VSWR or resistance antenna bridge. The meter still works but you get a tone as well.
Watch the video to find out more.
Want a self-contained unit without the meter movement? Here you go.
There's other applications for this as well. For instance you could try it in a Wheatstone bridge circuit to measure resistance, capacitance or inductance. Or any other application where you are adjusting a meter for a null. You might even be able to save money by removing the meter movement altogether and just rely on the tone.
Why not make it audible?
That means the pitch drops to nothing as you approach 1:1 VSWR.
Here is a simple 555-based voltage controlled audio oscillator (designed by Drew Diamond VK3XU) that can be connected across the meter movement of a VSWR or resistance antenna bridge. The meter still works but you get a tone as well.
Watch the video to find out more.
Want a self-contained unit without the meter movement? Here you go.
There's other applications for this as well. For instance you could try it in a Wheatstone bridge circuit to measure resistance, capacitance or inductance. Or any other application where you are adjusting a meter for a null. You might even be able to save money by removing the meter movement altogether and just rely on the tone.
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