Transistor Light Bulb Driver

The circuit is useful for audio/music lights. The circuit drives the 1.5 V light bulb. There is a similar product on Elecrow: https://www.elecrow.com/light-bulb-indicator.html. The problem with that product is that a high current output (from a power amplifier) is required to drive the light bulb. Our product does not need a current power amplifier. You can connect this circuit to the output of an operational amplifier or a digital-to-analog converter of a microcontroller.

You can control the brightness of the light bulb by changing the input bias. Ideal audio input to the circuit should be biased at about 0.7 V. This can be done with a simple voltage divider circuit or a transistor circuit. The yellow wire is the circuit input. The black wire is ground. The red wire is the 1.5 V power supply for the additional voltage divider/transistor circuit.

The uploaded images show schematic and PSpice simulations.

You can watch the circuit working in this video:

More information on interfacing this driver to other circuits is shown in this link: https://lowcostcircuits.blogspot.com/p/sound-light-bulb.html