VU meter only with transistor | Without any IC

In this video, I've shown a VU meter using transistor BC548 and BC558 and with Zener diode 1n4148.
Required Components:
Resistors: 1 KΩ, 10 KΩ
transistor: BC548, BC558
Capacitors: 47μF/ 25v, 1μF/ 25v
Diode: 1n4148 (Zener)
Miscellaneous: LEDs.
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Видео VU meter only with transistor | Without any IC канала EE Wave