14-05-03 SIM900 GSM/GPRS
12-03-27 Black Spot II
11-12-28 Trinity RF Power Meter
11-02-05 Robot Voice
10-04-10 Transcendent Frequency Counter
09-12-22 Rotator experiment











Front end design of antenna
Antenna filter impedance
RF field meter


How to make aircoils
Air Coils (inductance measurement)
How to calculate slug tuned inductor
More test about slug tuned inductor
IF-CAN (Intermediate Frequency CAN)
How to calculate toroids
TOKO-Variable & Molded Coils
Quadrature FM Detectors
Ceramic filter
LC-meter
Improved LC-meter


Explore inside of a Radio
How a radio receiver works
50 MHz FM receiver (for my 50 MHz crystall controlled transmitters)
AM-Receiver for Aircraft communication
Synthesizer controlled AM-Receiver for Aircraft communication
Cordless phone BUG
MC 13136 experiment (Narrow band FM receiver)
SA602, SA612 Mixer
78-80 MHz Superfast Scanner
50MHz Receiver for the IR detector
Automatic Frequency Control (AFC)
Super improved AM-Receiver for Aircraft.
900MHz Cordless Phone Bugging.
Mixer testing of FM-receiver
DTMF Radio Receiver
POCSAG. Post Office Code Standardization Advisory Group
RC Receiver for airplane
How to make a PCB
How to solder smd components
MC3362 FM Receiver


Xenon Flash Indicator
50 MHz transmitter I (1 transistor, FM)
50 MHz transmitter II (3 transistor, FM)
Crystal controlled bugg transmitter FM
50MHz Power Amplifier (transmitter)
50MHz Transmitter for the IR detector
Power amplifier class-C
Bugs and cockroach
Digital Wattmeter for RF based on AD8307
Wife Replacer
500mW FM PLL transmitter 88-108MHz
PLL bug transmitter
Digitally controlled FM transmitter (Part I)
FM PLL controlled VCO unit (Part II)
1.3W Power Amplifier
Bird Transmitter
RF Power Amplifier Module S-AV10H TOSHIBA
30W Digital Wattmeter for RF (0-500MHz)
1.5W Power Amplifier class-C (Part III)
250MHz RF Generator
TR1001 868.35 MHz Hybrid Transceiver
Ipod Stereo FM transmitter 1W
GPS Jammer
GPS Jammer Black Spot II
Trinity RF Power Meter



Audio amplifier with squelsh-control



45-860MHz Radio receiver based on UV916-tuner
TV-tuner and Spectrum Analyzer
Super Scanner 45-860MHz with 0.01Hz stepsize
Superior TV-tuner receiver 45-860MHz in 2500Hz step



Frequency Counter
Introduction to Fundamental Crystal Oscillators
VCO-Voltage Controlled Oscillator
VCO tester and logger
Wireless Frequency counter
Poor man's counter
2.5 GHz Frequency counter
Exclusive 2.5GHz Frequency Counter
Transcendent Frequency Counter



PIC16F84 programmer
The Smart Switch
AD9835 Direct Digital Synthesis (DDS)
Vacuum Fluorescent Display (VFD)
ISD4002-120 Recording Circuit
Basic Introduction to PIC familly
Boot Loader software for PIC16F870
Rotator experiment
NE555 timer circuit
IDE Hard Disk experiments
Robot Voice

Software download for all my projects
SIM900 GSM/GPRS



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Rolls-Royce Griffon engine 65
This is the most beautiful engine
I know. It was developed during WW2 and used in Spitfire and P51 Mustang.

Once I stood only 2 meter from Griffon engine during a start. The sound from this 2050hp monster can not be described with words!
I can only say "respect"

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