This circuit drives 4 sequences of 5 LEDs that can be of any color. The frequency depends on the characteristics of the photosensor. The circuit is from an 80's documentation.
This op amp circuit is based on a 555 IC and two common op amps. Transistors are general purpose....
This circuit is an application for an operational amplifier with field effect transistors from...
This stabilized source can supply currents up to 700 mA and the output voltage is close to 15 V. a...