This circuit from 303 Circuit Elektor Electronics . The LC circuit frequency will change when the metal object altered the Inductance of inductor.
TUP, TUN, DUG, DUS
TUP is Transistor Universal PNP, TUN is Transistor Universal NPN, DUG is Diode Universal Germanium and DUS Diode Universal Silicon , are standard components that most retailers have in stock and have minimum specification that use as general purpose diode and low frequencies transistor with different type numbers and have similar specification.
Crystal Tester Circuit
The circuit is use for test Quartz Crystal from 1 MHz to 50 MHz, if the crystal X1 good enough, sinewave will appears on Emiter T1 BF494 , and rectified by D2 IN4148 , drive D1 IN4148 and will charge Capacitor C4 until enough voltage to turn on Transistor BC547 and make the LED 1 on. This circuit using 9 V battery for enough consumption , below is PCB you can design . ( Source : Elektor Summer circuit)
Wideband Spark Transmissions Signal Receiver
This is circuit for Fun, receive spark transmissions signal from switch on off light , motors, high voltage lightning , electric motors can detected by this receiver on short wave band.
AM SW Converter with NE602
If you have old AM radio , you can use this circuit to change to Short Wave Radio, and tune the Short Wave frequency and start listening Short Wave around the world. The AM SW short wave radio can works from 1.6 MHz until 10 MHz by C1 with various values. from 150 pF until 10 pF , or you can use Trimmer Capacitor from 0-200 pF. For Crystals X1 can use 34.545 MHZ overtone crystal.
As datasheet NE602 describe , the features of this IC :
* Low current consumption : typical 2.4 mA
* Excellent noise figure : < 4.7 dB typical at 45 MHz
* High Operating frequency
* Excellent gain : intercept and sensitivity
* Low external parts count ; suitable for crystal / ceramics filter
NE602 Pin Out :
Test Configuration for NE602 , look at Crystal on Pin 6.
Applications :
* Portable Radio
* Cellular Radio
Example for Cellular Radio Application :
* VHF Transceivers
* RF Data Links
* HF / VHF Frequency conversion
* Instrumentation frequency conversion
* Broadband LANs
As datasheet NE602 describe , the features of this IC :
* Low current consumption : typical 2.4 mA
* Excellent noise figure : < 4.7 dB typical at 45 MHz
* High Operating frequency
* Excellent gain : intercept and sensitivity
* Low external parts count ; suitable for crystal / ceramics filter
NE602 Pin Out :
Test Configuration for NE602 , look at Crystal on Pin 6.
Applications :
* Portable Radio
* Cellular Radio
Example for Cellular Radio Application :
* VHF Transceivers
* RF Data Links
* HF / VHF Frequency conversion
* Instrumentation frequency conversion
* Broadband LANs
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