Hello,
Here is my goal:
To use a varying DC voltage signal to turn on an incandescent lamp. The input signal is sound from an audio file.
Currently I have three issues:
1. Trying to use a diode to drop a 3 Volt power source down to 2.4 V, which is what the incandescent lamp requires. Yet, I can't get this to work.
2-3. When not using the diode, I can get the lamp to operate. But not only is the lamp not very bright or fairly on when the signal is there, but it doesn't turn off. As well, when the signal is there, the power LED flickers.
Please see my images for the circuits.
The signal comes in and is taken through the base of a TIP 122. On the collector of that transistor, I have an LED which follows the audio envelope of the sound file. I'd like to transfer this signal to an incandescent lamp.
The lamp requires .8 Amp and 2.4 volts.
Issue #1: I've got a 5 volt 2 Amp power supply that I'd like to use. I've read where by using one diode in series with the power supply, the voltage drops 0.6 V. I can't get the lamp to turn on, when the diode is in the circuit
Issue #2: Once the signal isn't present, the lamp is still on.
Issue #3: The lamp is dim.
Any insights are welcome. Thank you for taking the time to read this and consider it.
Here is my goal:
To use a varying DC voltage signal to turn on an incandescent lamp. The input signal is sound from an audio file.
Currently I have three issues:
1. Trying to use a diode to drop a 3 Volt power source down to 2.4 V, which is what the incandescent lamp requires. Yet, I can't get this to work.
2-3. When not using the diode, I can get the lamp to operate. But not only is the lamp not very bright or fairly on when the signal is there, but it doesn't turn off. As well, when the signal is there, the power LED flickers.
Please see my images for the circuits.
The signal comes in and is taken through the base of a TIP 122. On the collector of that transistor, I have an LED which follows the audio envelope of the sound file. I'd like to transfer this signal to an incandescent lamp.
The lamp requires .8 Amp and 2.4 volts.
Issue #1: I've got a 5 volt 2 Amp power supply that I'd like to use. I've read where by using one diode in series with the power supply, the voltage drops 0.6 V. I can't get the lamp to turn on, when the diode is in the circuit
Issue #2: Once the signal isn't present, the lamp is still on.
Issue #3: The lamp is dim.
Any insights are welcome. Thank you for taking the time to read this and consider it.
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