This is the digital fan speed control circuit design that can be utilize to control the speed of 220V fans using induction motor. The speed control is nonlinear, i.e. in steps. The current step number is displayed on a 7-segment display. Speed can be varied over a wide range because the circuit can alter the… Read More »
Here is the 250W RMS power amplifier circuit called Legend-Stage Master. This is the previous version of Legend-Stage Master MK2. The circuit is based on power MOSFET and give a great output performance for indoor audio sound system.
This is the circuit design of unipolar stepper motor driver to control unipolar stepper motors with 5, 6 or 8 wires. It uses four MOSFET IRFZ44. This circuit can be operated in free-standing or PC-controlled mode.
This is 500W RMS power amplifier circuit design, build based on MOSFET. The circuit is very popular in EE audio hobbyist as “LEGEND stage Master MK2”. It is a very good and powerful amplifier. It uses 12x power MOSFET IRFP240.
This is a low cost, simple, yet a surprisingly powerful electronic siren powered by just a 9V battery. The circuit may provide the final circuit block module in an alarm circuit using a relay to activate it.
9 Volt Siren Kit — CK1207 A simple 9 volt siren kit with a surprisingly loud output. Uses voltage controlled oscillator; comes with a half-watt 8 ohm speaker. Good as a sound module to attach to an alarm system, etc.
Unipolar Stepper Motor Driver Kit — CK1405 Unipolar Stepper Motor Driver Kit. Standard circuit to driver unipolar stepper motors with 5, 6 or 8 wires. Uses 4 IRFZ44’s. Can be operated in free-standing or PC-controlled mode. Uses standard IC’s: 4013, 4030 and 4093.
This bipolar stepper motor driver circuit will drive a bipolar stepper motor using externally supplied 5V levels for stepping and direction. These usually come from software running in a computer or from a microcontroller unit. The circuit uses IRFZ44 and MTP2955 MOSFET’s.
Bi-Polar Stepper Motor Driver Kit — CK1406 This bi-polar stepper motor driver kit will drive a bi-polar stepper motor using externally supplied 5 volt levels for stepping and direction (Usually provided by PC Software. Uses IRFZ44 and MTP2955 MOSFET’s.