This is for any tech who has a few minutes to try and figure out a problem for funnzies and if you're willing of course.
I am still making the Tweety Bird noise toy. I clean and do any refurbishing necessary to several D104 models and Turner +3's, install them and resell. Folks keeping buying them so there is a market.
The Tweety fires a single "tweet" when you key the mic, then makes the repeating tweet when the activation button is pushed.
The Key Up tweet is accomplished by the presence of a polarized capacitor across the activation button. When the mic is keyed the capacitor's charge is dumped into the circuit creating the noise. Cap is recharged when the mic is unkeyed.
Here's the problem. This Key Up tweet (KUT) is found to function only on certain mic models. It will not do the KUT in mics with more extensive electronic circuit boards OR if you install it in a radio. The toy will otherwise function normally (fires when activation button is pushed).
Toy Ground (TG) is normally connected to mic chassis, which is isolated from Battery Negative. (Toy will not KUT if TG is connected to battery negative)
So the tweety works fine (does KUT) in D104 TUG8's, TUG9's and any TUP9 stand except for K Eagles. And the Turner mics are fine.
Will NOT do the KUT in K Eagles, Galaxy Echo (Sadelta clones), Synchrons etc.... or again, if installed in a radio.
I've tried connecting TG to every other possible grounding point. I've tried diodes on Toy pos & grd to allow current flow in the proper direction but preventing backflow. I've tried isolating the circuit boards from the chassis. None of this worked.
Something is preventing the capacitor from charging, or more likely, discharging properly, when the mic is keyed in these mics with more extensive circuit boards. I am not not a schooled technician, just a tinkerer and cannot figuring out what is causing this situation. Everything else about these installations remains the same and is essentially a three wire hookup with 1) 9V pos. 2) chassis [non-battery negative] ground 3) audio
Anybody have any ideas? I appreciate ya !
I am still making the Tweety Bird noise toy. I clean and do any refurbishing necessary to several D104 models and Turner +3's, install them and resell. Folks keeping buying them so there is a market.
The Tweety fires a single "tweet" when you key the mic, then makes the repeating tweet when the activation button is pushed.
The Key Up tweet is accomplished by the presence of a polarized capacitor across the activation button. When the mic is keyed the capacitor's charge is dumped into the circuit creating the noise. Cap is recharged when the mic is unkeyed.
Here's the problem. This Key Up tweet (KUT) is found to function only on certain mic models. It will not do the KUT in mics with more extensive electronic circuit boards OR if you install it in a radio. The toy will otherwise function normally (fires when activation button is pushed).
Toy Ground (TG) is normally connected to mic chassis, which is isolated from Battery Negative. (Toy will not KUT if TG is connected to battery negative)
So the tweety works fine (does KUT) in D104 TUG8's, TUG9's and any TUP9 stand except for K Eagles. And the Turner mics are fine.
Will NOT do the KUT in K Eagles, Galaxy Echo (Sadelta clones), Synchrons etc.... or again, if installed in a radio.
I've tried connecting TG to every other possible grounding point. I've tried diodes on Toy pos & grd to allow current flow in the proper direction but preventing backflow. I've tried isolating the circuit boards from the chassis. None of this worked.
Something is preventing the capacitor from charging, or more likely, discharging properly, when the mic is keyed in these mics with more extensive circuit boards. I am not not a schooled technician, just a tinkerer and cannot figuring out what is causing this situation. Everything else about these installations remains the same and is essentially a three wire hookup with 1) 9V pos. 2) chassis [non-battery negative] ground 3) audio
Anybody have any ideas? I appreciate ya !
