Do you have the same as I? Missing one hand during QSO-ing? That's why I wanted to make an adapter for a PC-headset to the transceiver. Headsets are there in a variety to buy, from cheap to very expensive. But a usable headset for me is that one witch doesn't give me red ears after an hour of use (HI). I choose for a headset from creative. It wares comfortable and the microphone can be connected to the headset with a 3.5mm jack. With a simple circuit the headset is usable to the transceiver. Because I use the Yaesu transceivers FT896 and 857 I'll found the drawing below on the internet.
Such a simple circuit so that I build it around the connectors. The combination C2, R2 is used for RF filtering for the microphone signal. Capacitor C3 needs to be placed as near as possible to the electrets element. Capacitor C1 is used for the high tone filtering. I used a small cabinet where I glued two female 3.5mm jacks in and on top a three position switch. Switch in the middle is for RX. When I pull the switch to me, the transceiver switches to TX. When I release the switch in comes to the middle position. When I push the switch the TX function becomes active wile the switch stays in that position (LOCK function).

Then there where the connections on the transceiver. It's always a hard job to find out how the wires need to be connected. How do we count? Is one on the left or on the right? When we see a connector do we look at the pins from the front of the connector or from the inside of the connector? With the RJ45 connector it's not so difficult. I took a standard patch cable used for computers.
If we pickup the connector with the contact pointing to us than the left pin is 1 and right of course number 8.
Now the only thing to do is to put the according wire on the matching pin from the RJ45 connector. That's very hard to do with a shielded microphone cable. Because the wires should have the exact matching diameter otherwise the wires are not properly connected or won't fit in the connector. So I choose for an other option. I used a standard patchcable and cut about 10cm of wire complete with connector.
The cable from the plastic box is a 7 wire shielded cable that I connected to the patchcable using the wiring diagram below.