GL1500. Help Wanted: Electronics Geek... PLEASE!

603 Views 4 Replies 3 Participants Last post by ghostvet, Mar 14, 2013

ghostvet

Discussion Starter · Mar 13, 2013

Hey all...

I am STILL fighting with using my J&M headset to also connect to my Android whilst the bike... At least I am determined... :ROFL:

Anyway- Iam REAL close to success... essentially, I just need to run a small electret mic in addition to the condensor mic already in the chin bar.

Everything wiorks fine... with one little problem- if I turn up the Intercom volume while using the phone, I get tremendous feedback after the dial is at about 9:30-10:00 posiiton. The person on the other end of the phone does not hear it.

For now, I have to remember to turn off the intercom if I use the phone. Not ideal, but functional...

There does not seem to be a positional problem vs the condensor mic since moving it does not alleviate anything. I do not get feedback with the Goldwing radio (I have not tried it with the CB though).

So, how do I eliminate the feedback? Diode? Resistor? Flux capacitor?

raying:

So, while I wait for this answer, I guess I will clean up my workbench (weeks of working with wiring, etc), and then install my new Stebel Compact Nautilus horn I got at Daytona bike show. Can't wait for that beep!

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Rudy

· #2 · Mar 13, 2013 (Edited)

ghostvet said:
Hey all...

I am STILL fighting with using my J&M headset to also connect to my Android whilst the bike... At least I am determined... :ROFL:

Anyway- Iam REAL close to success... essentially, I just need to run a small electret mic in addition to the condensor mic already in the chin bar.

Everything wiorks fine... with one little problem- if I turn up the Intercom volume while using the phone, I get tremendous feedback after the dial is at about 9:30-10:00 posiiton. The person on the other end of the phone does not hear it.

For now, I have to remember to turn off the intercom if I use the phone. Not ideal, but functional...

There does not seem to be a positional problem vs the condensor mic since moving it does not alleviate anything. I do not get feedback with the Goldwing radio (I have not tried it with the CB though).

So, how do I eliminate the feedback? Diode? Resistor? Flux capacitor?
raying:

So, while I wait for this answer, I guess I will clean up my workbench (weeks of working with wiring, etc), and then install my new Stebel Compact Nautilus horn I got at Daytona bike show. Can't wait for that beep!

An electret mic IS a condenser mic. Neither of which would I want anywhere near a speaker on the same amp.
Condenser mics are designed to be omni-directional high sensitivity.
The problem you are having is why magnetic mics are used on bikes most of the time. Even ceramic mics can be problematically sensitive if not managed properly.

The other common problem is that since the mic and headphone speaker wires run in the same cables, crosstalk can cause oscillation easily if shielding and routing isn't addressed. This is what sounds like your problem is and possibly combined with the possible misuse of an over sensitive mic as well.

I have no way to know which from here but the short answer is... It's either acoustic feedback or induced electrical feedback or both.

You can always run the mic or headphone speaker wires down a different pair to get them away from each other for testing at least to try to see if it solves anything. It's a matter of isolation of several possible causes.

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dadztoy

· #3 · Mar 14, 2013

Rudy said:
An electret mic IS a condenser mic. Neither of which would I want anywhere near a speaker on the same amp.
Condenser mics are designed to be omni-directional high sensitivity.
The problem you are having is why magnetic mics are used on bikes most of the time

Wow - I can't begin to tell you how much I disagree with that statement Rudy... I have been using electret (condenser) mics on my Wings since the early 90's and never have I had problems with feedback, noise, or any other issue... Electret mics are designed like any other mic and as such, each individual design will dictate pattern, sensitive, signal to noise ratio, and gain...

I currently use the old Air rider system of many years ago which uses an electret mic element combined with a small interface box which houses the 9 volt battery and interface electronics... It has worked flawlessly for the last 15+ years and I would NEVER use anything but an electret mic on my bike... The audio is crisp, clear, and of sufficient gain to properly drive my Bluetooth interface on my 665 Zumo...

I suspect either a shielding problem with the OP's setup or he is running the gain too high on the electret mic circuit... For proper operation, his circuit should have the proper voltage divider (volume control) to limit the gain of the elected mic into the Wing radio...

Les

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ghostvet

Discussion Starter · #4 · Mar 14, 2013

Rudy said:
An electret mic IS a condenser mic. Neither of which would I want anywhere near a speaker on the same amp.
Condenser mics are designed to be omni-directional high sensitivity.
The problem you are having is why magnetic mics are used on bikes most of the time. Even ceramic mics can be problematically sensitive if not managed properly.

The other common problem is that since the mic and headphone speaker wires run in the same cables, crosstalk can cause oscillation easily if shielding and routing isn't addressed. This is what sounds like your problem is and possibly combined with the possible misuse of an over sensitive mic as well.

I have no way to know which from here but the short answer is... It's either acoustic feedback or induced electrical feedback or both.

You can always run the mic or headphone speaker wires down a different pair to get them away from each other for testing at least to try to see if it solves anything. It's a matter of isolation of several possible causes.

Because I am still testing, the mic wire for the phone is isolated from the curly-q wiring of the J&M headset cord.

Currently I have the phone, intercom, CB Radio, and stereo radio/tape player all using the same speakers (the J&M headset).

The J&M mic is used for the goldwing stuff only. The phone is using a seperate electret mic in the chin, using a seperate cord.

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ghostvet

Discussion Starter · #5 · Mar 14, 2013

This is as dirty, bare-bones, and unprofessional as it gets.... :ssshh:

All is did is patch into the existing speaker lines. From the 1/8" TRRS connector on the phone, I ran the L, R, & Ground directly into the J&M headset.

The mic I picked up from the TRRS connector and ran a direct line to a small electret mic. There are no other electronics or components involved- just a straight wire connection.

The mic ground is connected to the speaker ground since there are not enough pins to go around (5 pin DIN vs 4 pin TRRS).

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