OK,Folks!! Here is the connection scheme for the four circuit stereo earphones plus microphone plug: Tip= left channel (usually), ring =Right channel (unless swapped with the left) , THEN comes the first part of the sleeve, just past the ring: THAT is the "common" for both the headphones AND the microphone circuit. Then the final segment of the sleeve, which is the very end,is the microphone hot (signal) connection. NOW on the jack, if it is a three circuit jack only intended for headphones, the "sleeve" portion that is intended to make contact with the common on a TRS, (tip Ring Sleeve) jack may be rather short so as to leave room for the switches intended to disconnect the internal speaker in the package. That sleeve may be too short to contact the "common" sleeve.

Adding that microphone connection should have been forbidden, and none of that garbage ever allowed into the USA!! The four circuit plug should have been a larger diameter so as to not fit three circuit jacks.
Being in a crowd with a bunch of individuals jabbering on their phones, always louder than needed, is a real nuisance, and rather an irritation when I am trying to have a conversation with a person next to me.

 

Please post a link to the product page where you ordered the jacks.

ak

 

OK, I went back to post #1 and looked at the pictures. To quote from "Smokey and the Bandit", "What we have here is a failure to communicate."
Consider that the item shown as a microphone has a stupid four circuit plug. with the microphone common side in the inner sleeve section and the microphone signal on the outer end sleeve. The three circuit stereo headphone jack does not connect to the microphone signal at all.
So that aside from any issue with capacitor values versus frequency response, there is the basic failure that with no input signal and no output connection it will be a real challenge to get any signal out of the amplifier.
What we have not ever seen is the connections to the stereo headphones jack that the TS is using. It is possible that the picture of the microphone with the smartphone connector on the cord does not relate at all to the headphones that the TS is using. BUT that information is not provided yet.

Can the TS please show us close-up photos of the connections to the input and output jacks? That may reveal the problem.

 

All that's required is to measure and see if there's any voltage across the mic element.

 

If the connectors are from amazon, we can get as much information from my friend's cat.

 

All that's required is to measure and see if there's any voltage across the mic element.

GOOD LUCK doing that! the whole mic assembly has a smart-phone connector molded on and the connector shown does not match the plug shown.
And to make it more interesting the TS has not shown us how they connected to the three circuit headphone jack.

 

Measure the voltage at the junction of R1 and C1.
Should read supply level if the mic is not connected

 

Actually,it is also possible to check the headphone connections with an ohm meter. IF the headphones are working, then with the ohm meter negative connected to the circuit common, (battery negative) there should be heard in the headphones a click when the meter positive probe touches the terminal of C7 or C8. If there is nothing, then achieving that connection will be a first step.