Laser Communicator WITHOUT Audio Output Transformer

The Laser Communicator Receiver

Unfortunately, this is where I have to give you the disappointing news.  I’ve tried many circuit designs and have failed to find one that produces satisfactory results.
My goal in providing a receiver circuit is to avoid the necessity of Radio Shack’s Mini Audio Amplifier, Catalog #: 277-1008, because costs around $15 and you might never use it again after this.  We could build an amplified receiver for much cheaper than this too, that is, if I ever find a circuit that works.  I mainly focused on the Laser Torch-Based Voice Transmitter And Receiver circuit because of it’s use of a phototransistor, which is inexpensive.  I would like to make one that uses either a phototransistor or a LDR (light dependent resistor) since they are both low-cost.

But for now, the mini audio amplifier will have to work.  If you nave the expertise to design a great receiver circuit or know one that will work great for this, contact me and I’ll offer a reward for it if it works great.

2 thoughts on “Laser Communicator WITHOUT Audio Output Transformer

  • January 21, 2014 at 3:37 AM

    Hey. I want to build the Laser Transmitter with Mono Input. Would you take a picture of the connected Laser Transmitter?

    • January 21, 2014 at 10:03 AM

      Hey Chris,
      I updated page 2 to include pictures of my transmitter ( 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.


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