To make a single LED flash in time with your amplifier's music, we have the circuit given below. The diode in parallel with the LED prevents inverse voltages greater than 5 V from causing it to burn out. The resistor Rx depends, in its value, on the power of the amplifier, as well as its impedance, according to the following table.
The diode can be of the type 1N4148 or even 1N4001. When assembling, obey the polarity of the LED and the diode.
| Clique na imagem para ampliar |
| Clique na imagem para ampliar |
