Roger G3XBM's (Mainly) Amateur Radio Blog

A twin-tee audio oscillator is a very useful item to have around the shack. Looking around the net for suitable circuit values yesterday I c...

If you want a range "sure fire" crystal oscillator designs to suit fundamental and various overtone modes you should check out the...

Harry Lythall SM0VPO has a most interesting site full of ideas. Among the useful stuff is an oscillator calculator which allows you to wo...

Mike Rainey AA1TJ has some good tunnel diode ideas on his pages but these devices are hard to find these days. Instead one can create a neg...