Showing posts with label Voice. Show all posts
Showing posts with label Voice. Show all posts
Monday, 9 January 2017
Voice Scrambler Circuit Diagram
With this circuit you can modify how your voice sounds by changing the pitch of your voice. This circuit can be connected to a phone and with a duplicate circuit on the end of the phone line, you can have a scrambled voice communication. The way the circuit works is as follows: If we cut the circuit in half at the T2 transformer and include the LM324 on the left side, you will see that the LM324 portion of the circuit is a tone oscillator which shifts the frequency of all input signals to a new higher frequency. When the voice and the tone oscillator mix frequencies the voice is not recognized. The voice signal is then inputted to the second stage which again shifts the voice signal again. I recommend that the first stage be tuned to a frequency that is 100hz lower then the second stage.
Voice Scrambler Circuit Diagram
Voice Scrambler Circuit Diagram
Thursday, 5 January 2017
Build a Scanner Voice Squelch Circuit Diagram
This Scanner Voice Squelch Circuit Diagram detects the presence of audio (voice) on the output of a scanner. If the scanner stops on a `dead carrier` or noise, the circuit mutes the speaker to avoid annoying noise. Ul amplifies speech and drives rectifier D1/D2 and switch Ql. Comparator U3 drives speaker switch Ql and indicator LED1. Q2 completes the speaker path to ground. U2 is an audio amplifier to drive the speaker. R3 is a volume control. PL1 connects to the scanner speaker or to the headphone jack .
Build a Scanner Voice Squelch Circuit Diagram
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