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6 Transistors no IC spectrum analyzer LED circuit DIY



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I show You how to make 6 Transistors no IC spectrum analyzer LED light circuit. This circuit using 6 small NPN Transistors without using any IC (Integrated Circuit). 3 Transistors as the preamp and also as the Low Pass Filter (LPF), Band Pass Filter (BPF), and High Pass Filter (HPF).

Basically on each band is a circuit of VU METER LED with audio frequency filters.

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Component list:
- 6 pcs NPN transistors; C1815 or C945, or You can use any other NPN transistor (but You have pay attention into EBC pin sositions).
- 36 pcs 3v LED bulbs.
- 6 pcs Elco 10uF at least 16v.
- 39 pcs 1N4148 Diodes.
- 36 pcs 820 ohm Resistors.
- etc.

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#SpectrumAnalyzer #LedCircuit #Electronic
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Audio
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