I've ordered one of these: https://www.amazon.com/gp/product/B074Z1LDY2/, a tactical throat mic (and earpiece speaker) which is intended to be used with Kenwood two-way radios (and other compatible models). I'm interested in using this with conventional CTIA TRRS inputs/outputs as found on cell phone and laptops.
I know the pin-outs are incompatible as they are so I know I need to re-wire at bare minimum. What I'm trying to discover is how to tell if I need some capacitors and resistors or a full, externally powered circuit to support the mic (my primary interest, the speaker is less interesting to me).
I have a mid-level multi-meter and no oscilloscope. I know the pin-outs for these generally:
How can I best reverse engineer what the two-way radio mic is expecting and how to hook it up to what the cell phone is providing WRT to power? I've not been able to find any references on Kenwood two-way radio mics. Any tips for strategy to make this work, particularly not requiring more specialized testing equipment, would be very helpful. Also, any warnings and strategies for not damaging equipment would also be helpful. ;-)
[Edit: I've come across this which is basically the opposite of what I'm interested in doing but may give helpful context to someone with more insight that I have. http://www.n1gy.com/headset-adaptor-for-kenwood--baofeng-and-wouxun-hts.html ]
Works perfectly as described by @JRE below. The 3.5mm pin plugs directly into the breadboard jack on the right; the 2.5mm pin plugs into a 2.5->3.5mm adapter and then plugs into the jack on the left. The wiring specifics should be discernible via the photo.