Vu meter leds10/2/2023 Be careful with pins B-C short-circuited. But you need to swap the legs and turn them back. Then adjust VR1 to LED glow fully all LED. While connects the input signal from a speaker of a power amplifier. Then, test to provide the voltage power supply to this project. And all transistors Q1-Q10 that together into the voltage compare circuit.įigure 2 the PCB layout and the components layout of the 20 LED cheap electronic VU-meter using transistor project That consists of C1, C2, D1, D2 to the circuit. Then, the signal is sent to the voltage doubler rectifier circuit. In addition to this project is very easily circuit and also can modify to drives Solid State Relay for easily control a larger lamp.Īs you see the complete circuit of the projects in Figure 1.Īn input signal from the power amplifier is passed through to VR1, to adjust the amplitude of this input signal at the proper level. Which the circuit using a generally IC will cannot directly connect to uses. This is 20 LED VU meter schematic is designed for who want to have a circuit that can drive LED up to 20 pcs (Stereo 40 LEDs). Not only that see improved circuits with PCB layout. Digital multimeter circuit using ICL7107.Here are a few related posts you might want to read: Then expand to the LED current to light the rhythm music. To forward to the transistors Q2-Q4, each level of the signal strength coming. This will serve to break the sound signal to gradually decrease, respectively. The remaining signal is sent through diodes D3, D4 and D5. The first part of the signal will flow through R1 to the base of Q1. Which both diodes rectifier AC to DC with positive and negative together.Īfter that, DC voltage comes to C2 to filters into a smooth DC voltage. Next, the signal goes into the circuit to increase the voltage with D1 and D2. Then, flows through the C1 signal coupling. And VR1 passed the input signal and adjust the sound more or less. Recommended: Learning Electronics for beginners! How it worksįirst of all, when applying the power supply to the circuit. So, all transistors can drive all LEDs to emit light much more. Also, the output is DC voltage.Īdding LEDs for 25 LEDs Analog VU Meter circuit using transistors They approximately double an incoming AC voltage. It has a voltage doubler circuit, C1, C2, R1, R2. The weakness of the previous circuit is cannot display low voltage. Recycling free white SMD LED from e-waste Note: likewise you can see the second circuit that using more LEDs, too. It causes the current can flow to three diodes, D1, D2, D3, So, LED1-LED3 glow up. But LED4 and LED5 will go out. Back…reading.Įach diode has a voltage across is 0.6V. Related: KA2284 Stereo audio level indicator And the LED4 shows the most level signals. The LED1 displays an audio level with the least light. To drive LED1-LED4, to show the level of the signal. They limited bias current to the base of Q1-Q4 to increase current up to each collector. To forward to each the transistors Q1-Q4 through Resistors, R5-R8. Second, divide the audio signal to gradually decrease, respectively.First, rectify the audio signal, AC voltage to DC voltage.Next, four diodes D1, D2, D3, and D4 pass the input audio signal. Simple LED VU meter circuit using transistors Then, connects an input of the VU meter to the output of the amplifier. When entering the power supply to the circuit. Here is a simple VU meter. It has only the necessary parts. Recommended: Learn transistor circuit works here 5 LED VU Meter Circuit Simple circuit-suitable for learning basic electronics.You can fix it one by one, do not change it all. Although we need to use a lot of transistors. Cheap-They are inexpensive when compare with IC.But we can use other transistors instead like 2SC828, 2SC945, 2SC1815, etc. But it is still always popular.ĢSC458 transistor, now The factory quit producing it. Easy to get them-Although they are quite ancient.But I can show you the transistor is so great all the time. Related Posts Why should use transistors version
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