This is simple signal injector circuit, used two transistors join together as astable multivibrator, signal output frequency 1,000Hz in square wave form.
Tag: BC547
This is Simple preamplifier circuit using transistors,low noise and easy to builds we have many circuit below, simple to difference projects
The video amplifier splitter circuit, it is designed to take video signal is stronger. Compensate for the loss of signal, and is video splitter video