Circuit Lake

Electronic Project and Circuit Collection

Ham Radio

1.5V Battery Operated FM transmitter

May 07, 2012 By: admin Category: Analog, Ham Radio, Transmitter No Comments →

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, television receiver, or radio receiver. This transmitter does not have pre-emphesies, so it is not high-fidelity. It has sort of an “AM” sound […]

1W RF Amplifier for iPod Stereo FM Transmitter

April 30, 2012 By: admin Category: Analog, Ham Radio No Comments →

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 often used in cars. The problem with most FM transmitter is that they have very weak signal […]

Low Picofarad Capacitance Meter

August 31, 2011 By: admin Category: AVR, Ham Radio, Measurement, Microcontroller, Project, Tools No Comments →

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 (guaranteed); 2500 pF possible and resolution: 0.1 pF. To read the result, this low cost C meter comes with 2 lines LCD. […]

Crystal Radio With External Speaker

April 07, 2011 By: admin Category: Analog, Audio, Basic, Ham Radio No Comments →

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 battery or power source and runs on the power received from radio waves by a long wire antenna.