This motor speed control with tachometer sensor was found in the 1993 Radio Experimenter Special Projects. The maximum current is 2.4 A.
In the figure we have the typical circuit of a Baxandall tone control applied to an operational...
August 2017 - Microchip's new ATtiny1617 8-bit AVR microcontrollers running at 20 MHz and 16 kB...
This Signetics circuit uses a double 555 (556) to generate tone bursts at frequencies determined by...