This is a ham radio transceiver Ham radio transceiver RF indicator circuit that small and easy to build. Use diode,transistor drive LED display 2 status
More circuits about oscillator, pulse, frequency , and others.
The CCD camera sensor is device that have very useful. This project has small size. But quality is a lot good. We can install with Television easily
This is DIY wireless audio video sender circuit,using all transistor and simple components, with PCB layout, Distance is about 40 feet and small
This is FM receiver circuit using sex transistors that very small size and cheap, The trimer capacitor To control the frequency from 87MHz to 108 MHz.