This circuit with two HT2030s powers 6 LEDs in a decorative flashing system. The circuit is from Electronics Now magazine, December 1997. The LEDs are fed in sequence.
The simplest filter for this purpose is the one shown in the figure consisting of two coils and...
We found this automotive alarm circuit in a 90's Popular Electronics circuit. The circuit emits a...
This basic op amp filter configuration was found in July 1975 Radio Electronics magazine. The...