Using two 741 operational amplifiers, this low-pass circuit has a cutoff frequency of 10 kHz. We found it in an article in the magazine Electronics Now from August 1993.
This circuit is from an old American documentation using as indicators for the flip-flops neon...
This circuit that uses only discrete components (transistors) mimics the sound of an American...
July 1017 - Maxim MAX17290 and MAX17292 PWM boost controllers can now be purchased from Mouser...