Frequency Marker Generator
COLT45 is a small multi-purpose device intended for the Amateur Radio operator, short wave listener, or other experimenters. Functions include a versatile frequency marker generator, a Morse code...
View ArticleFM Transmitter with a Single Transistor
Here is the most stable, smallest, and energy saving FM transmitter. It uses only single transistor oscillator, PN2222A. Other high frequency / low noise transistor like 2N2222A, BFxxx series, BC109B,...
View ArticlePLL FM Transmitter with PIC-Based Tuning
This easy to build PLL FM transmitter can deliver RF power output typically of 5 Watt. The project uses PIC16F627A to control PLL IC TSA5511 during FM Tuning process. PLL in-lock state status is...
View ArticleCrystal Radio With External Speaker
Crystal radio is the simplest type of radio receiver, and can be handmade with a few inexpensive parts, like an antenna wire, tuning coil of copper wire, crystal detector and earphones. It needs no...
View ArticleLow Picofarad Capacitance Meter
This little instrument, named as Pico C, can be used to measure capacitances down to fractions of a picofarad. It built based on ATtiny2313 microcontroller. It has range: <1 pF to 2000 pF...
View Article1W RF Amplifier for iPod Stereo FM Transmitter
If you want enjoy and share your favorite music, you can connect your iPod, MP3 or CD player to some kind of FM transmitter. The transmitting signal then can be picked up by any FM radio receiver, most...
View Article1.5V Battery Operated FM transmitter
The purpose of this 1.5V FM broadcast transmitter circuit is to provide a simple, appliance-like low-power transmitter to rebroadcast audio. It can be used to rebroadcast the output of a CD player,...
View Article
