V
VK3ZYZ
Guest
Do you have a need for a small, battery operated gizmo? Here is one take on it.
My son wants to run a Zoom concert with 4 performers. Each needs a headset, so this is what I came up with.
(Circuits tomorrow, maybe)
Started with a Jaycar 4 AA switched battery box. PH9282
Two cells of the terminals are removed to convert it to a 2 cell box..
and the +ve placed in the new position.
Part of the plastic divider and terminal retainers for the now unused cells is removed to make way for the LED and the 2 3.5mm stereo sockets.
Holes to suit are drilled in the end then the sockets and a green LED are super glued in.
Next, a 3K9 resistor is added to the LED Anode, the LED Cathode goes to the sockets sleeve solder tab, as does a 100nF cap. That will be the power -ve connection. The black wire from the battery switch goes here too later.
The other end of the cap is soldered to the free end of the 3K9 resistor to make the power +ve connection. The red battery wire will go here.
Next, the 3K to 3K CT audio transformer has some wires soldered on to make it ready to put on place.
Now the transformer and battery wires are installed.
A hole is made to fit a length (in this case, around 5 M) of 4 wire shielded cable.
The red and white wired are connected to the transformer secondary and the yellow and black to the headphone socket.
The other end of the cable has the pairs connected to length of 2 wire shielded cable, the red and white go to an XLR mic connector to feed the mixer while the yellow and black go to a 3.5mm stereo plug for the head phone signal. Dual wall heat shrink tube secures the joints.
As there will be 4 sets listening to the sound , a quad headphone adapter is also needed.
Each headphone signal is fed via a 100R resistor to split the signal, and protect from overloading the PC output.
The 3V feeding through the transformer powers the electret mic in the headset quite well, and the transformer produced a balanced output eliminating noise. If the center tap is taken of the gnd point, it will also be isolated if required.
I an sure the same setup could be used for a transceiver if needed, providing power for the mic.
The LED is green to remind the used to plug the "green" plug in next to it, while the "pink" one goes in the other socket.
The cheap PC headset works fine.
My son wants to run a Zoom concert with 4 performers. Each needs a headset, so this is what I came up with.
(Circuits tomorrow, maybe)
Started with a Jaycar 4 AA switched battery box. PH9282
Two cells of the terminals are removed to convert it to a 2 cell box..
and the +ve placed in the new position.
Part of the plastic divider and terminal retainers for the now unused cells is removed to make way for the LED and the 2 3.5mm stereo sockets.
Holes to suit are drilled in the end then the sockets and a green LED are super glued in.
Next, a 3K9 resistor is added to the LED Anode, the LED Cathode goes to the sockets sleeve solder tab, as does a 100nF cap. That will be the power -ve connection. The black wire from the battery switch goes here too later.
The other end of the cap is soldered to the free end of the 3K9 resistor to make the power +ve connection. The red battery wire will go here.
Next, the 3K to 3K CT audio transformer has some wires soldered on to make it ready to put on place.
Now the transformer and battery wires are installed.
A hole is made to fit a length (in this case, around 5 M) of 4 wire shielded cable.
The red and white wired are connected to the transformer secondary and the yellow and black to the headphone socket.
The other end of the cable has the pairs connected to length of 2 wire shielded cable, the red and white go to an XLR mic connector to feed the mixer while the yellow and black go to a 3.5mm stereo plug for the head phone signal. Dual wall heat shrink tube secures the joints.
As there will be 4 sets listening to the sound , a quad headphone adapter is also needed.
Each headphone signal is fed via a 100R resistor to split the signal, and protect from overloading the PC output.
The 3V feeding through the transformer powers the electret mic in the headset quite well, and the transformer produced a balanced output eliminating noise. If the center tap is taken of the gnd point, it will also be isolated if required.
I an sure the same setup could be used for a transceiver if needed, providing power for the mic.
The LED is green to remind the used to plug the "green" plug in next to it, while the "pink" one goes in the other socket.
The cheap PC headset works fine.
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