tag:blogger.com,1999:blog-35901825.post6614146401778068959..comments2024-03-19T06:03:40.451+10:00Comments on marxy's musing on technology: Built a Gate Dip Oscillator (GDO) from Heckits.Peter Markshttp://www.blogger.com/profile/13007012724570360389noreply@blogger.comBlogger1125tag:blogger.com,1999:blog-35901825.post-24928303535652796252022-10-11T06:53:35.792+10:002022-10-11T06:53:35.792+10:00A GDO or whatever you want to call it pretty simpl...A GDO or whatever you want to call it pretty simple. A transistor, a meter, a tuned circuit. It's a good beginners project. And since you can get those frequency counter modules cheap, the hard work if calibration is gone.<br /><br />They were just one tubes in the old days, plus a power supply. Maybe a neon bulb for modulation.<br /><br />Bipolar transistors changed the design, but JFETsMichaelhttps://www.blogger.com/profile/13699701261288661640noreply@blogger.com