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Post by KneeBiter on May 17, 2012 18:39:29 GMT -5
Anyone know how to wire a 776 for a mkIII ? Any help is appreciated
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Post by cbrown on May 18, 2012 8:47:22 GMT -5
Won't work. You'd have to either pull a 5 volt source from the radio (and change to plug to feed the voltage to the microphone) or wire in a 5 volt battery into the 776 base.
If you want an amplified microphone, use one with a battery already in the base like a Turner or Astatic.
On my Mark III I don't use an amplified microphone.
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Post by KneeBiter on May 18, 2012 16:21:33 GMT -5
Sorry for the posting in 2 areas.
I see a bunch of mk3's out there with the 776. I am not in need of the preamp so is there a way to bypass that and wire it? I just like the look with the radio and have one so figure I could use it.
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Post by 238 on May 18, 2012 17:05:37 GMT -5
All 776 are not amplified. I thing thats is right 238
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Post by cbrown on May 21, 2012 8:52:26 GMT -5
All 776 are not amplified. I thing thats is right 238 As far as I know, none left the factory without the pre-amp board. That is not to say someone didn't remove the board later, but they were in there when they left the factory, if it is a Model 776 microphone. |
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43
Mudduck
Posts: 13
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Post by 43 on May 24, 2012 11:46:07 GMT -5
Just take out or bypass the amp board it will work fine. That what I did
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Post by KneeBiter on May 24, 2012 16:27:33 GMT -5
I posted this question on another forum. FIXER told me how to wire it with the preamp still in place. It works perfect on the mkIII with th 2 prong plug and the gain control works so I think the preamp is working . Dont know how or why but it does. Great to have people out here willing to help.  |
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Sandbagger
Administrator/The Boss 
Posts: 6,247 
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Post by Sandbagger on May 24, 2012 22:03:43 GMT -5
I posted this question on another forum. FIXER told me how to wire it with the preamp still in place. It works perfect on the mkIII with th 2 prong plug and the gain control works so I think the preamp is working . Dont know how or why but it does. Great to have people out here willing to help. I would love to know how you pulled that one off. The MK III has no capacity to power a mic through the mic plug. I just got done looking at the schematics of the MK III and MK IV and the MK IV has a 4 pin plug where one of the pins has 5V on it to power that mic. The MK III only has the mic input and the PTT line. So unless there's a battery inside the mic powering it, I can't see how it could work on a stock MK III without modding the radio to supply the voltage. |
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Post by KneeBiter on May 25, 2012 6:43:50 GMT -5
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Post by cbrown on May 25, 2012 8:37:33 GMT -5
What did you do with the red wire in the microphone cord? From what I read on the Browning site, Fixer told you to move the preamp wire, I believe. I'll have to check.
But if you didn't, like Sandbagger I'd love to know where the power for the preamp is coming from.
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Post by KneeBiter on May 25, 2012 8:44:40 GMT -5
Did just what he said. Blue goes to 1, Red to 2 and Shield goes to the shell. I used a NOS Browning brown 3 conductor cable.
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Post by FIXR on May 26, 2012 11:25:29 GMT -5
Knee,
The preamp is still connected. The voltage is derived from the red PTT wire. There is a 100 ohm dropping resistor and a couple of 5 V zeners on the preamp board to lower the PTT voltage to 5 V to power the preamp.
The brown stripe 776 replaced the banana mic on the last of the MKIII's. The later orange stripe model was for the MKIV and MKIVA. Either model can easily be changed over for either transmitter.
Alan
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Post by KneeBiter on May 26, 2012 15:40:41 GMT -5
Thank you for the info. It is a great help.
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amastron
Big Bucket Mouth
Don't take life too seriously; No one gets out alive!
Posts: 86
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Post by amastron on Aug 15, 2012 10:09:55 GMT -5
Knee, The preamp is still connected. The voltage is derived from the red PTT wire. There is a 100 ohm dropping resistor and a couple of 5 V zeners on the preamp board to lower the PTT voltage to 5 V to power the preamp. The brown stripe 776 replaced the banana mic on the last of the MKIII's. The later orange stripe model was for the MKIV and MKIVA. Either model can easily be changed over for either transmitter. Alan Mr. Alan, what would I need to change to get the Orange stripe mike to work on my Mark III SSB? |
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**GRUMPY**
Administrator/The Boss
Classic Radio Operator Olde Timer 8220 [/color][/center]
"The King of Ping"
Posts: 4,342
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Post by **GRUMPY** on Aug 16, 2012 7:56:25 GMT -5
Knee, The preamp is still connected. The voltage is derived from the red PTT wire. There is a 100 ohm dropping resistor and a couple of 5 V zeners on the preamp board to lower the PTT voltage to 5 V to power the preamp. The brown stripe 776 replaced the banana mic on the last of the MKIII's. The later orange stripe model was for the MKIV and MKIVA. Either model can easily be changed over for either transmitter. Alan Mr. Alan, what would I need to change to get the Orange stripe mike to work on my Mark III SSB? |
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Post by cbrown on Aug 16, 2012 9:01:25 GMT -5
If I understand Fixr's posts, you can wire the 776 to the Mark III like this:
Pin 1 - White
Pin 2 - Red & Black
Shell - Shield
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Post by cbrown on Aug 16, 2012 9:04:35 GMT -5
I'm not sure how fast you're going to get a reply from Alan, from what I was told Alan's house was struck by lightning and it put a big hole in the wall of the garage! Wow! I hope everyone there is okay! |
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amastron
Big Bucket Mouth
Don't take life too seriously; No one gets out alive!
Posts: 86
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Post by amastron on Aug 17, 2012 17:48:46 GMT -5
If I understand Fixr's posts, you can wire the 776 to the Mark III like this: Pin 1 - White Pin 2 - Red & Black Shell - Shield Thanks cbrown, do you still need a battery wired inside the base? And thanks Grumpy, hope all goes well for Alan! |
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Post by cbrown on Aug 20, 2012 8:15:37 GMT -5
Thanks cbrown, do you still need a battery wired inside the base? If I read his post correctly, the red wire in the 776 microphone is pulling voltage from the relay key circuit in the Browning. So the answer would be no on needing a battery. |
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Post by 2600 on Aug 22, 2012 16:04:06 GMT -5
The basis of this "impossible" trick is to use the power input to the preamp as your "ground" for the relay in the radio.
The relay will pull about 10 mA of current when you ground the transmit pin of the mike socket with a normal mike's transmit switch.
The power wire leading to the preamp in the 776 mike gets wired to the "transmit" side of the switch inside the mike. The wire going to this switch is hooked to the Mark 3 radio's transmit pin.
The preamp will "borrow" 8 or 9 Volts from the relay coil, since it now provides the relay's ground circuit. But the 110-Volt DC relay coil won't notice a change in voltage this small.
It's a "dirty trick", but it works.
However, if your Mark 3 got converted to use a low-voltage relay, this won't work. Changing the relay in a Mark 3 transmitter to a 12-Volt type removes the shock hazard caused by the factory-original type, but it locks you out of using this setup with a 776 mike.
73
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Post by Trapper_267 on Jan 21, 2018 10:31:23 GMT -5
I took all my Brown stripe Mark 2-3's apart and made this drawing on them. This is looking at the bottom from the mic cord to the switches.  |
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Post by SIX-SHOOTER on Jan 21, 2018 13:50:18 GMT -5
All 776 are not amplified. I thing thats is right 238 All of the 776 versions are amplified.There were some that came without the hole drilled in the bottom plate so that it could be adjusted but when the bottom cover was removed the tuning pot is there.Brown,Orange,or Red stripe it did not matter they all had the amplifier.I had one that was wired for a MK IV years ago & it worked great on my MK III as well.The radios & microphone both had been rewired to a 4 pin Cobra plug. SIX-SHOOTER |
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