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Audio Squelch Circuit - Making Easy Circuits
https://makingcircuits.com/blog/audio-squelch-circuit/#:~:text=In%20telecommunication%20devices%2C%20the%20squelch%20circuit%20is%20introduced,transmissions%20and%20when%20tuning%20an%20audio%20amplifier%20system.
Audio Squelch Circuit - Making Easy Circuits
https://makingcircuits.com/blog/audio-squelch-circuit/
Squelch Circuit - ElectroSchematics.com
https://www.electroschematics.com/squelch-schematic/
Squelch Circuit. Squelch is a circuit that acts to suppress the audio (or video) output of a receiver in the absence of a sufficiently strong desired input signal. This squelch circuit is simple and has an amplification for sufficiently large to be incorporated into an assembly of automatically control from a wide range of radio receivers.
What is Squelch | Function of Squelch circuit
https://www.rfwireless-world.com/Terminology/Squelch-circuit.html
What Is the Squelch Feature on My Wireless System?
https://www.audio-technica.com/en-us/support/audio-solutions-question-of-the-week-what-is-the-squelch-feature-used-for-on-my-wireless-system/
FM Audio/Squelch Board - stevedold.com
http://stevedold.com/squelch/manual.pdf
U1.2 and U1.3 that (mostly) removes any CTCSS component. The audio then passes through the squelch gate/de-emphasis circuit U1.4 and on to J2-4 to feed an external repeater controller or other device. Part of this audio also feeds speaker amplifier U5. Special-case modifications:
www.repeater-builder.com
https://www.repeater-builder.com/micor/pdf/mobile-audio-squelch.pdf
amplifier and limiter 224 43 c225 r20i 22uf c202 r202 39uf 15 cc 226 —25uf 9 9.4b/ 6.4 v v regulator 2nd amplifier r203 82k 5.51/ r204 i20k high c203 0.22 +9.6 v emitter follower 4.01/ 2 c220 .05uf 15 22 complementary r242 amplifier 22 q204 pnp q202 npn c receiver audio & squelch board ...žðå 6.3b' note 03 9 c244 3900 12 note 203 note 203
Simple Souelch - Radio Amateur 12-1971 - Amateur Radio Archive
https://www.radioexperimenter.us/rm-1971-12/simple-souelch.html
The squelch circuit can be inserted between the last audio stage of the receiver and the final audio amplifier. The squelch level is set by varying the IK pot. Power is most easily obtained from a 9V transistor battery. Frankly, no. Neither was it easy to learn how to read without two things: Proper Instruction, and practice.
US5774557A - Autotracking microphone squelch for …
https://patents.google.com/patent/US5774557A/en
Need circuit for mute the unwanted audio (Squelch control ...
https://www.edaboard.com/threads/need-circuit-for-mute-the-unwanted-audio-squelch-control-circuit.372849/
After this I'd decided to use this module in scan mode and implement separate squelch control circuit so that microcontroller can turn ON or OFF audio amplifier in absence of signal. Note that in this module RSSI checking stop responding after voice is transmitted (TX switch is pressed) so i can not use this method.
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