Posted by Jim Petersen (126.96.36.199) on March 04, 2003 at 22:02:35:
In Reply to: Re: Tapco Service Manuals And Operator Manuals posted by clair on July 07, 2002 at 06:38:21:
: : : I have a Tapco 6201B that I have just taken out of "mothballs" that I need some info on. My manual seems to be missing info from the "ON OFF Switch" to the end. What I have includes info on
: : I don't have a manual on this one but I bet Rick Chinn does.
: : Rick? The phantom power is the 48Volts (open cicuit) for the
: : powering of condensor microphones. This 48Volts is applied to
: : pins 2 and 3 of the 3 pin connector and the ground
: : is pin 1. Pin 2 is usually HOT with respect to pin
: : 3 when balanced mode is used. So, the application of the + 48 Volts
: : does not (normally) have any effect on a non-powered microphone
: : like the SM-58. Yes, the SM-58 is balanced, but not powered
: : so the 48 Volts DC, (if turned on), would appear at
: : pins 2 and 3, (the SM-58 balanced lines), but since there is
: : no voltage differential from pin 2 to 3, there is no current
: : drawn by the microphone and therefore no effect or harm done to
: : the sound or microphone. The powered microphones will use this
: : 48 Volts, (less when the mic is being powered because of the resistors
: : in the preamp of the mixer), from pin 2 and/or pin 3 to ground.
: : It's the reference to ground from pin 2 and 3 that makes the phantom
: : power work to power the microphone. Otherwise, pin 1 is just a ground
: : or shield for external fields.
: : Bob
: : : Channel Gain
: : : PAN
: : : Bass and Treble
: : : Effects
: : : Monitors
: : : MIC/Line switch
: : : Some Additional inputs on inputs
: : : Input connections
: : : Master Gain contols
: : : Rumble Filter
: : : MIC EQ
: : : Effect Returns Funtional description
: : : Master Monitor
: : : Phantom Power ON/Off switch
: : : and the first part of ON/OFF
: : : Am I missing anything critical?
: : : Also, can anyone tell me if a Shure SM 58 is a "balanced Mic?" Also, I am not sure I understand the purpose of Phantom Power.
: : : I appreciate any info I can get.
: : : Kit Kellison
An important consideration with Phantom power on dynamic and condensor microphones. When plugging or removing the mic wire if the phantom power is on there will be an electrical pop/spike into the sound signal path. If your board has a unified bus for phantom,
rather than a switch on the individual channel strips make sure the chanel fader is down or muted.
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