Electronics portal | Search electronic components online (or old version here) | >20 mln. datasheets | Electronic circuits, schematics, and diagrams | Social network for geeks | Electronics auctions | News about radio electronics | >50k service manuals | Free fonts download | Pinouts collection

Complete list of electronic components suppliers | Complete list of electronic components producers

LASER Transmitter/Receiver


This set of two circuits from the basis for a very simple light wave transmitter. A LASER beam is modulated and then aimed at a receiver that demodulates the signal and then presents the information (voice, data, etc..). The whole thing is very easy to build and requires no specialized parts execpt for the LASER itself. LASERs are available from MWK Industries.


Schematic Of Transmitter

Schematic for LASER transmitter

Schematic Of Receiver

Schematic for LASER receiver



Total Qty.



C1, C22 0.1uf Ceramic Disc Capacitor

C3 1 100uf 25V Electrolytic Capacitor

R1 1 100K Ohm 1/4W Resistor

R2 1 1M Ohm 1/4W Resistor

R3 1 10K Pot

Q1 1 NPN Phototransistor

U1 1 741 Op Amp

U2 1 LM386 Audio Amp

SPKR1 1 8 Ohm Speaker

T1 1 8 Ohm:2K Audio Transformer

MISC 1 Wire, Board, Knob For R3, LASER Tube and Power Supply


1. In the transmitter schematic, no ballast resistor is shown because most small LASER power supplies already have one built in. Yours may differ, and a resistor may be needed.

2. The receiver should be kept away from bright lights. You may want to put a piece of wax paper in front of Q1 to keep the LASER from swamping it.

3. In order to get any decent amount of modulation, you may need to drive T1 with more then a watt.

4. The circuit can be made to transmit computer data with the use of two modem chips.

VN:F [1.6.9_936]
Rating: 0.0/10 (0 votes cast)
VN:F [1.6.9_936]
Rating: 0 (from 0 votes)

Discuss this article at the forum