Laser Communicator WITHOUT Audio Output Transformer

The Transistor-based Laser Communicator Transmitter

For this design, I’ve successfully built the following and have had good success with it.  I’ve given schematics for 2, but they are essentially the same.  One is for mono input and the second is for combining stereo input the correct way.  The mono input one uses a 10uF electrolytic capacitor, which will give you better bass preservation.  The stereo input uses .01uF (103) non-polarized capacitors and lacks as much bass response as the other.  I recommend trying different capacitor values here and find one that works best for you.

laser transmitter - schematic - Mono Input

Laser Transmitter – Mono Input

laser transmitter - schematic - Stereo Input

Laser Transmitter – Stereo Input

Supplies:

 

My Assembled Laser Transmitter

Laser Communicator Transmitter
Laser Communicator Transmitter
Laser Communicator Transmitter

2 thoughts on “Laser Communicator WITHOUT Audio Output Transformer

  • January 21, 2014 at 3:37 AM
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    Hey. I want to build the Laser Transmitter with Mono Input. Would you take a picture of the connected Laser Transmitter?

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    • January 21, 2014 at 10:03 AM
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      Hey Chris,
      I updated page 2 to include pictures of my transmitter (http://blog.mklec.com/laser/2/). I’m combining the stereo input into mono on it though. To use a mono input, you can eliminate the (2)10K resistors on the input and one of the 0.1uF capcacitors. Just compare the two schematics given and that’s basically the only difference besides the first uses a 10uF capacitor.

      Reply

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