This circuit was found in a French publication called Generation Electronique, It can be assembled using BC548 for T1, BC558 for T2 and BD135 for T3. What he does is turn on the lamp when speaking in front of the microphone. We can supply it with 6 V and use a relay instead of L1 to have a Vox, or relay triggered by sound. The microphone is an electret.
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