My kids are learning Morse code this summer, so I threw together this little circuit to help them learn. And to make it more fun… It uses an ATtiny85 ($2.26 at digikey.com) to drive a piezo beeper (? $3.50 at Radio Shack.) The ATtiny85 takes 5.5V max, so I built the circuit on a piece…
DetailsWith a simple, clean design this Elekit TU-879S single-ended, class-A vacuum tube amplifier kit echoes past greats like the Japanese made Audio Note Ongaku. Supplied with EH 6L6 tubes, this versatile amplifier is able to handle just about any octal based power tube on the current production market. We have tried it with JJ KT77,…
DetailsModel 8LS Stereo Integrated Tube Amplifier Stereo Integrated Tube Amplifier Kit that is easy to build, sounds great, and is just fun! The Stereo Integrated Tube Amplifier utilizes 5670 triode and 6005 pentode tubes. The amplifier has built in volume control so that it can be driven directly from a CD player, tuner,…
DetailsNow you can build your own valve radio with a combination of old and new technology. The valve provides strong reception and the typical sound of valve radios, while a modern audio IC and a high-quality loudspeaker provide an optimal sound level. In addition to the characteristic sound, the warm glow of the valve heaters…
DetailsThere an issue of using YAESU “FT857d” transceiver CAT control in conjunction with the YAESU antenna tuner “FC40”. It controlled through the CAT. Thus it is not possible to use the CAT together (example with E-LOGBOOK or other devices) through the same CAT Port. While developing “FT857d” transceiver the YAESU engineers have envisaged a baypass…
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