This circuit with two operating modes was found in the September 1989 issue of Radio Electronics magazine. Other operational amplifiers can be used. The power supply must be dual.
Using a 4046 PLL this circuit generates rectangular signals in three wavebands that depend on the...
This circuit is from the LM3914 manual and can be found elsewhere on this site and from other...
The circuit used is the 4093 configured as an inverter in this application from Radio Electronics from...