Re: PTT pop hack

Raj vu2zap Member Profile All Messages By This Member #25314 Very annoying pop in the audio. It is even worse with the Motorola mic I am using. If I turn the audio volume control to minimum then the pop almost disappears. That tells me that source is the preamp stage. I tried a small cube relay to disconnect the speaker but the relay does not seem to be fast enough. The amp cap charge remains long enough to amplify the pop. Muting the volume control with a relay/2n7000 makes it worse! I gave up, I am going to build an amp with TDA2822 and see if that is any better next week! I hope that it will be a "bobs your uncle moment"! There are some ready boards on the bay thats worth experimenting with. Some even come with a volume control for a few bucks. Raj toggle quoted message Show quoted text At 20/04/2017, you wrote: Simple brute force solution use a small relay to disconnect the speaker on tx keep a 1k resistor as a load and to keep the output capacitor charged pop should go Sent from my iPhone On 20 Apr 2017, at 12:40, Allard PE1NWL <pe1nwl@...> wrote: Yes I tried this already, but I still got a pop each time I connected the pin to ground... 73, Allard PE1NWL On Thu, April 20, 2017 13:22, Steve Greer wrote: Is there a way that we can use the mute feature of the lm386 on ptt. The datasheet says ground I believe pin8 will mute the lm386 and this would eliminate the pop in the ear????

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