|
|
Post by hellcat on Mar 14, 2023 16:36:38 GMT -5
I’ve seen mic adapters for sale that will allow you to run a 4 pin Cobra mic on a Browning Mark lll ( 2 pin Amphenol ) Doesn’t the Browning have 100 to 300 volts DC coming out of that connector? Where does this voltage go when a mic is plugged in? To ground? Can it hurt anything?
|
|
|
|
Post by 2600 on Mar 16, 2023 23:45:49 GMT -5
The transmit pin of the mike socket is connected to one side of the relay's coil. When the mike is keyed, it connects this side of the relay coil to ground.
The other side of the relay coil goes to a 15k 10 Watt resistor R62. The other end of R62 goes to the 330-Volt DC tap of the power supply. That's the approximate voltage that appears on pin 2 of the mike socket in receive mode. When the mike is keyed, that 330 Volts drops down to about 280 Volts. The relay coil gets about 110 Volts of this, the resistor R62 gets the other 170 Volts more or less.
Since the relay socket must be changed to replace the relay, we took the attitude that converting it to a 12-Volt DC relay is worth the small added expense that requires. This makes the exposed pin 3 on a 4-pin Cobra/Galaxy type mike socket a lot safer. Pretty sure I posted the step-by-step for this mod here on the forum a year of few ago.
73
|
|
