Super LED Blinking With 1 Transistor||Make Blinking Lights 3.7-12Volt
This is a fairly simple project for anyone with some electronic skills.
Plug this circuit into an audio source and the LEDs will blink to the rhythm of the music. All it really does is use the voltage from the audio input to activate a transistor and turn on the LEDs.
This circuit is very customizable. The setup of the lights is really up to you. The main thing to consider when choosing layout for the LEDs is your audio source and the power supply you will use.
For this particular one I chose to make it run off a 9v battery and use an IPod for input.
Depending on the configuration of your setup you may need to modify the number of parts below.
Parts:
Superbright LEDs, the number and color are up to you (I used 4 blue ones).
2 x TIP 31 NPN Transistors, the heart of the project.
Audio cord (a headphone cord will do or just an 1/8 inch jack)
case (I used a spare thick cardboard box)
9v battery clip (or the power supply you are using)
Tools:
Soldering iron
Wire cutters/Strippers
1.Solder 2 of the LEDs together in series. Connect the anode (long pin) of the first LED to the cathode (Flat side/short pin) of the second LED.
***NOTE you can add more LEDs in series or a resistor depending on the voltage of the power supply.
2. Now connect the Cathode of the first LED to the middle pin of the TIP 31 (the collector).
3. Repeat steps 1-2 again (for the second part of the stereo input)
4. The Anodes of the last LEDs go to positive voltage.
5. The right pins of the TIP 31s (emitter) go to ground.
Take the audio cable, strip the ends, and determine which wire is right and which is left. Red is usually right and white is usually left.
Another way to determine the sides is to take a multimeter and do a connectivity test with each wire and part of the jack
The tip of the jack is right.
The middle of the jack is left.
And the bottom of the jack is ground.
NOTE****
Decide which set of LEDs will be right and which will be left.
Then connect the corresponding wires to the left pin of the TIP 31s
Connect the positive part of the battery clip to one side of a switch and the positive end of the LEDs to the other.
Then mount it all in a case (i used an old jewelry case).
I used a hot glue gun to secure everything, and some electrical tape to protect against any shorting.
Here are some additions/modifications that people have suggested and asked for.
1. The first addition is adding an output jack wired in parallel to the audio input wire. Unfortunately the case I used was a little too small for this.
2. Different configurations of LEDs. Many people commented on using different numbers/colors of LED. The main thing to be careful of is the VOLTAGE that you draw. (Series vs parallel). The next step I'm going to try is maybe using an RGB LED.
3. Transistors. I am not an expert at transistors. Use an NPN that is rated for the appropriate voltage.
4. Mounting the LEDs in interesting cases. I'm going to try mounting them in a pair of portable speakers.
Super LED Blinking With 1 Transistor||Make Blinking Lights 3.7-12Volt
This is a fairly simple project for anyone with some electronic skills.
Plug this circuit into an audio source and the LEDs will blink to the rhythm of the music. All it really does is use the voltage from the audio input to activate a transistor and turn on the LEDs.
This circuit is very customizable. The setup of the lights is really up to you. The main thing to consider when choosing layout for the LEDs is your audio source and the power supply you will use.
For this particular one I chose to make it run off a 9v battery and use an IPod for input.
Depending on the configuration of your setup you may need to modify the number of parts below.
Parts:
Superbright LEDs, the number and color are up to you (I used 4 blue ones).
2 x TIP 31 NPN Transistors, the heart of the project.
Audio cord (a headphone cord will do or just an 1/8 inch jack)
case (I used a spare thick cardboard box)
9v battery clip (or the power supply you are using)
Tools:
Soldering iron
Wire cutters/Strippers
1.Solder 2 of the LEDs together in series. Connect the anode (long pin) of the first LED to the cathode (Flat side/short pin) of the second LED.
***NOTE you can add more LEDs in series or a resistor depending on the voltage of the power supply.
2. Now connect the Cathode of the first LED to the middle pin of the TIP 31 (the collector).
3. Repeat steps 1-2 again (for the second part of the stereo input)
4. The Anodes of the last LEDs go to positive voltage.
5. The right pins of the TIP 31s (emitter) go to ground.
Take the audio cable, strip the ends, and determine which wire is right and which is left. Red is usually right and white is usually left.
Another way to determine the sides is to take a multimeter and do a connectivity test with each wire and part of the jack
The tip of the jack is right.
The middle of the jack is left.
And the bottom of the jack is ground.
NOTE****
Decide which set of LEDs will be right and which will be left.
Then connect the corresponding wires to the left pin of the TIP 31s
Connect the positive part of the battery clip to one side of a switch and the positive end of the LEDs to the other.
Then mount it all in a case (i used an old jewelry case).
I used a hot glue gun to secure everything, and some electrical tape to protect against any shorting.
Here are some additions/modifications that people have suggested and asked for.
1. The first addition is adding an output jack wired in parallel to the audio input wire. Unfortunately the case I used was a little too small for this.
2. Different configurations of LEDs. Many people commented on using different numbers/colors of LED. The main thing to be careful of is the VOLTAGE that you draw. (Series vs parallel). The next step I'm going to try is maybe using an RGB LED.
3. Transistors. I am not an expert at transistors. Use an NPN that is rated for the appropriate voltage.
4. Mounting the LEDs in interesting cases. I'm going to try mounting them in a pair of portable speakers.
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