Instructables

2 transistor Crystal radio amplifier kit - shortwave science fair

This kit is 5.00 dollars . To order send email. Then send check.  The amplifier  has the parts soldered on top of homemade circuit board. It is tested . I listen for KCBS, KGO,kSCO and several other stations with only a small ferrite on a crystal radio..  Only the circuit board is included.  The coil and tuning capacitor are not included. Many coil and variable capacitor combinations will work up to about  13 Mhz.  There is a small wire near the output which provides feedback when it is moved towards the input.  Each station is tuned individually as the feedback is different. Wrap several turns around the input coil (not included).  The variable capacitor is in parallel with the coil. The shortwave coil can be a 1 inch diameter with 13 turns of narrow wire. Stations I pick up are Radio Havana Cuba,  Radio New Zealand , Church and amateur. There are some cautions. It could include cutting tape for your circuit design.  The shortwave requires an external antenna. Schematic included. Crystal earphone is not included. Another transistor can be added for speaker  or 8 ohm type earphone.

Picture of 2 transistor Crystal radio amplifier kit - shortwave science fair
Pro

Get More Out of Instructables

Already have an Account?

close

PDF Downloads
As a Pro member, you will gain access to download any Instructable in the PDF format. You also have the ability to customize your PDF download.

Upgrade to Pro today!