There are 120 circuit schematics available. Last circuit added on Tuesday, 19 May 2015.

CircuitCategoryDate AddedOK?
Bridge headControlAug 14, 2002
PWM motor controllerControlJun 06, 2003
Home Automation Over InternetControlMar 25, 2009
CMOS control voltage for firing Crydom Soft-Start Motor ModuleControlMar 25, 2009
FAN Thermostat controlled by IR remote controllerControlMar 25, 2009
Delayed Power Circuit using an SCRControl 
H-Bridge CircuitControl 
High current PWM controller based around a 555 timerControlSep 23, 2009
Relatively simple thermostat circuit diagramControlSep 23, 2009
Electric heater thermostatControlSep 23, 2009
Making a bistable from a normal relay, based on coil hysteresisControlJul 21, 2013
Two-button control for dangerous machinesControlOct 05, 2012
MOSFET based H-Bridge controller for DC motorsControlMar 17, 2014
Clap operated remove control for fansControlDec 07, 2014
Presure based hit switchControlDec 07, 2014
Light switch using LDRControlJun 26, 2009
Heating System ThermostatControlJun 26, 2009
Touch switch based on CD4011 flip-flopControlJun 26, 2009
DC Motor Control CircuitControl 
Fan control based on a TL082 opamp and IRF510 power MOSFETControl 
Simple 120 VAC motor speed controller based on a TRIACControl 
Electronic Control for DC Motors Using Discrete Bridge Circuits (PDF)Control 
Digital Encoder Circuit Using Stepper MotorControlJan 08, 2014
Various CNC mill circuit diagrams and other DIY CNC mill informationControlJun 17, 2011
H Bridge Motor Control CircuitsControlJun 09, 2002
Unipolar and bipolar stepper motor driver circuits using 74194 and ULN2803ControlNov 04, 2011
HIGH or LOW Power Switch For Lights or Small MotorsControlSep 10, 2006
Push Button Motor Control CircuitsControlSep 10, 2006
Motor speed controllersControlJun 17, 2003
GSM SMS javljalnik ALSMS-01 (page in slovenian )SMS remote control projectControlOct 07, 2009
Variety of simple motor control circuit diagrams using SCR or TRIACControlFeb 20, 2010
Dremel drill speed controllerControlMay 16, 2010
PWM Heater fan controller based on PIC12F675ControlMay 24, 2010
Audio Signal Detecting Auto Power-On UnitControlMar 30, 2010
Mains Power Load Sensing Automatic SwitchControlMar 30, 2010
Thermo-Fan to keep your amplifier or other equipment coolControlMar 30, 2010
Current loop interfaceControlAug 12, 2001
AC Motor Speed ControllerControlSep 01, 2009
Simple Two Speed Contactor DC Motor ControllerControlSep 01, 2009
Light/Dark Detector drives a relayControlSep 01, 2009
Pulse Width Modulation DC Motor ControllerControlSep 01, 2009
Water Detector With Sump/Bilge Pump ControllerControlSep 01, 2009
Time Delay RelayControlSep 01, 2009
Time Delay Relay IIControlSep 01, 2009
Simple Servo Controller using 555 TimerControlSep 01, 2009
Stepper Motor Controller using 4027 flip-flop and 4070 XOR gateControlSep 01, 2009
Touch Switch using 4011 CMOS NAND Gate ICControlSep 01, 2009
Stepper motor driver using PIC12F675 that offers serial port command interfaceControl 
Stepper motor driver using PIC12F675Control 
H-Bridge Motor Control with Power MOSFETSControlMar 23, 2015
Simple temperature regulated FAN speed controllerControl 
Three electronic circuit diagrams for thermal controllers including linear and PWM controlControl 
Shadow activated (or hand wave) motion detectorControl 
Pushbutton one-shot and latch (PDF)ControlJan 26, 2001
Charge coupled bi-directional power MOSFET relay (PDF)ControlJan 26, 2001
Finger touch activated switch (PDF)ControlJan 26, 2001
Machine vibration triggers hour meter (PDF)ControlJan 26, 2001
Solid state relay (PDF)ControlJan 26, 2001
Line-powered Xenon flash transmitter (PDF)ControlJan 26, 2001
9V Xenon photoflash controller (PDF)ControlJan 26, 2001
Op Amp based PID Controller circuit with SPICE simulationControlMar 26, 2011
No-Hum Fan ControllerControlSep 13, 2006
AC switching with TRIAC from TTLControlJan 26, 2001
Control 120VAC relay with TTLControlJan 26, 2001
Driving a relay with a CPUControlJan 26, 2001
Clap activated remote controlControl 
Light Operated SwitchControl 
Optically isolated stepper motor controllerControlFeb 21, 2005
Stepper motor positionerControlJan 26, 2001
555 Based Simple Servo ControllerControl 
H Bridge controller for DC motorsControl 
DC Motor Controller using 74 series chipsControl 
Water system controller (PDF)Control 
Miniature Real-time Controller based on a 89C2051ControlApr 22, 2014
Circuit for soft start module for induction motorControlJun 19, 2011
Time switch with two optotriacs to control resistive AC loads directlyControlMay 19, 2015
DS1821 programmable thermostatControlMar 01, 2003
LDR light/dark activated relay switchControlJun 17, 2003
Touch SwitchesControlJan 26, 2001
6090 digital decoder schematicsControlOct 30, 2002
Smooth, fast, strong and cheap stepper motor controller using a PIC microControlNov 04, 2011
Selection of PWM driver circuits for electric DC motorsControlNov 05, 2009
Arduindo based Appliance Remote ControlControlJun 20, 2010
Remote Motor ControllerControl 
Assorted relay control circuitsControlMar 18, 2003
Thermal cooling fan controllerControl 
Electronic circuit diagram of cell phone SMS remote control deviceControl 
DIY Power Pulse ControllerControl 
H-Bridge Motor Driver Using Bipolar TransistorsControlAug 12, 2009
Dual fan controller using ATTiny45 microcontrollerControlNov 02, 2010
DC Motor-Driver H-Bridge CircuitControlJun 09, 2002
How to Make a PWM Circuit without a MicrocontrollerControlAug 12, 2009
Optically isolated TRIAC driverControlAug 17, 2009
Light / dark activated relayControlJan 26, 2001
Pulse width modudulator using 555 timer ICControlAug 03, 2009
Constant Temperature CircuitControlSep 21, 2006
PWM Motor Speed Controller / DC Light DimmerControlSep 07, 2009
PWM Motor/Light Controller circuit diagramsControlSep 07, 2009
DAS1 - 12 Volt 10 Amp Dark Activated SwitchControlSep 07, 2009
12 Volt Differential Temperature ControllerControlSep 07, 2009
PWM Motor Speed Controller / DC Light DimmerControlNov 17, 2002
Constant Temperature CircuitControlJan 26, 2001
PWM DC Motor Speed ControlControlJan 26, 2001
CO2 controller for planted tanksControlJan 26, 2001
Relay circuit for relay control via an RS232 portControl 
Micro-step driver - connect a bipolar steppe motor to a PC through the parallel portControl 
PA fan temperature controlled speed motor speed controllerControl 
Homemade Water Drain Pump controllerControl 
Dual stepper motor drivers using UDN2540ControlJul 03, 2011
PWM DC motor driver and control with SG3525ControlJul 03, 2011
Hot Water Tank Level IndicatorControlNov 27, 2002
Temperature monitor using 741 opampControlJan 26, 2001
Voltage comparator switchControlJan 26, 2001
Dark activated switchControlJan 26, 2001
DC Push Button Motor Control CircuitControlJan 26, 2001
Light detectorControlJan 26, 2001
DC Motor Reversing CircuitControlNov 27, 2002
Sound operated switchControlJan 26, 2001
4 Digit Keypad SwitchControl 
Simple keypad operated switchControl