133 lines
8.0 KiB
Plaintext
133 lines
8.0 KiB
Plaintext
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AM LIGHTWAVE TRANSMITTER AND RECEIVER BY JOE SCHARF
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-------------------------------------------------------------------------------
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SCHEMATIC 1 [TRANSMITTER]
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-------------------------------------------------------------------------------
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MIC* C1
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() + .1 uF
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|---------(OO)-----|(--------| +9V
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| () | ^
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| R3 R4 | /|\
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| 5.6K 5.6K | |
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*---/\/\/\-------*---/\/\/\--|-------*-------*------|
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| | | | | |
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| | >R1 | | |
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| | |---->>>50K | >R5 >R8
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| __|3___|2_ >VAR | >1K >220
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| \ + - / |RESIST | > >
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| \OP AMP/-----|-------- | |
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*----------------\741 /7 | | | **
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| 4 \ / >R2 | C/NPN Q1
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| \/ >1M |---------B| TRANSISTOR
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| |6 > | | E\ 2N2222
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| | | C2 | | |
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| | | + 10 uF | >R6 |
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| ----------*---|(-----*-->>>50K |
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| >VAR |
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| |RESIST| LENS
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| | __|___*** ^
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| | \LED / (|)
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| | \ / ( | )
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| R7> \/ (|)
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| 1K> -----|---- \/
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| > | LENS
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| | | OPT.
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|--------------------------------------------*-------|
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--------
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----
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--
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_______________________________________________________________________________
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R1-GAIN CONTROL
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R6-LED BIAS CONTROL ADJUST R6 FOR BEST SOUND QUALITY
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R8-LIMITS CURRENT APPLIED TO LED
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* - MIC- USE CRYSTAL MICROPHONE OR ELECTRET UNIT (CONNECT RED LEAD TO 9V)
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** - TRANSISTOR - USE A 2N2222 NPN TRANSISTOR.
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*** - LED - USE A HIGH-BRIGHTNESS RED OR HIGH POWERED INFRARED LED FOR BEST
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RESULTS
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_______________________________________________________________________________
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THE 741 AMPLIFIES VOICE SIGNALS FROM THE MICROPHONE AND COUPLES THEM THROUGH C2
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TO MODULATOR TRANSISTOR Q1. FOR A FREE-SPACE RANGE OF UP TO 1000 FEET
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(AT NIGHT), USE A LENS TO COLLIMATE THE LED BEAM OR USE THIS CIRCUIT AS
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AN OPTICAL FIBER TRANSMITTER.
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_______________________________________________________________________________
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SCHEMATIC 2 --- AM LIGHTWAVE RECEIVER
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_______________________________________________________________________________
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|-----------------------------------------|
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>R1 |
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>100K |
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> |
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LENS | C1 .1uF |
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^ *----|(---------*-------| |
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(|) C| | | |
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( | ) /Q1 | | | +9V
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( | ) B|PHOTOTRANSISTOR | | | ^
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(|) E\ |-----| | | | /|\
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\/ | | __|3_|2_ | | |
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LENS | | 4\ + - /7 | | |
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*-------*----\ 741/------|-----------------*---------*
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| \ / | | |
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| \/6 | | |
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| | >R2 | ------ C2
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| | >100K | ^^ .1 uF
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| | > | ^ |^
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| |--------* | |
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| | | --------
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| | | ----
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| | 3|\ | -
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| | |------|+\|6
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| | | |* \--------------|
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| R3< | | /5 C3 | +
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| 10K<<------| |----|-/| 100uF -----
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| VAR< | 2|/4| ^
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| RESIST| | | |
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| | | | 8 OHM|---/|
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| | | | SPEAKER| ||
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| | | | |---\|
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|------------------------*---------*-------*--------------|
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----------
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------
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--
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_______________________________________________________________________________
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R2-GAIN CONTROL
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R3-VOLUME CONTROL
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C2-PREVENTS OSCILLATION KEEP LEADS TO BATTERY SHORT.
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* --- OP AMP --- THIS MAY NOT LOOK LIKE AN OP-AMP BUT IT IS (VERY HARD TO
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DRAW THEM ON THE COMPUTER. USE A 386 OP AMP FOR THIS ONE
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_______________________________________________________________________________
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THIS RECEIVER WORKS BEST IN SUBDUED LIGHT OR AT NIGHT WHEN USED FOR
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FREE-SPACE COMMUNICATIONS ALWAYS PLACE A SHIELD OVER THE DETECTOR IF SUNLIGHT
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OR BRIGHT ARTIFICIAL LIGHT IS PRESENT. AN INFRARED FILTER SHOULD BE USED
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FOR BEST RESULTS (DEVELOPED COLOR FILM WORKS WELL) UNLESS THE TRANSMITER
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LED EMITS VISIBLE LIGHT.
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CAUTION : THIS CIRCUIT CAN PRODUCE LOUD SOUNDS. DO NOT PLACE SPEAKER CLOSE
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TO YOUR EAR.
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_______________________________________________________________________________
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FEEL FREE TO PASS THIS CIRCUIT AROUND AND IF YOU HAVE ANY QUESTIONS OR
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PROBLEMS YOU CAN CONTACT ME ON CHUCKS PLACE (304)-776-7078 BY LEAVING E-MAIL
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TO: JOE SCHARF
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_______________________________________________________________________________
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