This dual-LED circuit indicates three signal levels. It was found in the January 1996 issue of Electronics Now magazine. The integrated circuit may be an LM339 or another comparator.
The circuit presented was found in a documentation from the 1950s, generating a sinusoidal signal...
This circuit makes use of the Linear Technology LT1637. We find it in a 2005 manual. The circuit...
Using the Texas Instruments SN75489P this circuit was found in June 1978 Radio Electronics...