![]() Most mics are designed with some form of current limiting so this isn't a problem. *Actually, circuit 2 also shorts the output stage of a condenser mic, lowering the impedance it sees to zero. Those have to use circuit 2, so the ribbon's preamp doesn't lose its voltage. which makes their operation similar to a P48 condenser. But ribbons that have an internal preamp (many modern ones) usually require P48. It'll also work with classic low-output ribbons. So circuit 1 disconnects the line-out device entirely, and shorts the console input to prevent noise.Ĭircuit 1 will also work with dynamic mics, since they don't have an internal preamp with an output stage. which can cause damage to the output stage, depending on design*. It'll also work for non-powered mics.īut if you're shorting a line-output device, circuit 2 shorts the output. So: good reasons to use circuit 2 for P48 mics. but won't change any noise issues when the phantom comes back. Shorting both of them to ground (i.e., shorting all 3 pins together) does affect the audio path as well as phantom, which quickly mutes the audio while you remove phantom. That's the opposite of what we want to do. which, of course, kills the audio when the mic's internal preamp dies. Shorting either 2 or 3 to ground won't affect the audio path with most P48 mics, but does short the phantom out. So circuit 2 shorts the audio, which is carried as the difference between pins 2 and 3. Since the phantom voltage is equal on both legs, shorting a mic's 2 to 3 doesn't affect it. For the same reason, it's not a good idea to switch a console's phantom supply while the mic fader is up. it can cause slight delay while mic's caps discharge, and a pop, momentary hiss, or delay when it comes back on (depends on the mic). If you're muting a P48 mic, you don't want to interrupt the phantom voltage. There are two schematics for a good reason: ![]()
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