BC574 8-Million Gain DIY Kit

Fun and Easy to make DIY Circuits For Students And Hobbyist.

This circuit is so sensitive it will detect "mains hum."  Simply move it across any wall and it will detect where the mains cable is located.
It has a gain of about 200 x 200 x 200 = 8,000,000 and will also detect static electricity and the presence of your hand without any direct contact.
You will be amazed what it detects! There is static electricity EVERYWHERE! The input of this circuit is classified as very high impedance.
This circuit has a high educational value, because uses the basic concept of amplification, which is the basic job of a transistor.

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