Elmer 101 was created by members of the Internet QRP club as a tutorial on transceiver theory. The tutorial is based on the design of the SW+40 transceiver kit from Small Wonder Labs and was designed so that it complemented the construction of the kit. Tutorial users would read a little theory, do a little construction, and then test their kit to observe the theory in action. Hundreds of QRP-L members have used this material to expand their knowledge of radio theory.
I taught a kit-building class based on the Elmer 101 materials. The presentation materials I created are available as MS Powerpoint slides and can be downloaded by lesson:
Lesson 1: Parts inventory and voltage regulator
Lesson 2: Oscillators and the VFO
Lesson 3: Transmit switch and transmit mixer
Lesson 4: Transmit bandpass filter, buffer, and driver
Lesson 5: Receiver input, receive mixer, and IF filter
Lesson 6: Product detector and first audio amplifier
Lesson 7: Receiver mute circuit, second audio amplifier, and active bandpass filter
Lesson 8: The final amplifier and low pass filter
You’ll need MS Powerpoint in order to view these materials. The slides are also available in PDF form in a single zip file. Leave a comment below if you have any questions or feedback regarding these materials.