K101: LM317 Adjustable Power Supply

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This kit is designed around the LM317 3-terminal adjustable voltage regulator.  It is capable of supplying in excess of 1Amp over an output  range of 1.5volts to 27volts.
 

An input AC or DC voltage source of 3V to 35V (not included)  from a transformer, such as a wall-mount type AC adapter, or a DC power source to the circuit will provide a regulated DC power supply output that is adjustable by varying a potentiometer.  A heat sink (not supplied) may be needed for the LM317, depending on your application.  See the specifications of the LM317 Data Sheet.
 

This circuit is perfect for those who want a small, compact  adjustable power supply.  It can be used on the bench and it is small enough to fit in robotics, models, automobiles, video game  modifications, equipment enhancements, etc. 
 

The PCB is 1" x 2", double-sided, 0.062", FR-4, with silk  screening on the top side, and mounting holes.  This is an excellent  chance to learn about and build your own power supply.   

See the kit Manual for schematic, assembly and operating instructions, and parts list.

This kit is based on the popular LM386 audio amplifier.  The LM386 in this kit is rated for 700mWatts into an 8-Ohm load while the maximum gain can be set to 20, 50, or 200.  

The  unique input stage of the LM386 allows ground referenced input signals. The output automatically self-centers to one-half the supply voltage.  It has a low THD (Total Harmonic Distortion) rated for 0.2% at 125mWatts.  See the specifications on the LM386 Data Sheet. 

Uses include MP3 output amplifiers, guitar amplifiers, headphone amplifiers, audio source amplifiers, intercoms, line drivers, alarms, ultrasonic drivers, TV sound systems, AM-FM radio, small servo drivers, small speaker driver for your computer, etc.  Included are an input  connector that is a 2.5mm phone jack and an output connector that is a standard RCA jack and it is possible to wire in different connectors (not supplied) of your own choosing.  A potentiometer is supplied to  control the volume.  This kit will work with batteries or power source from 4VDC to 12VDC.

The  PCB is 1" x 2", double-sided, 0.062", FR-4, with silk screening on the top side, and distributed ground on top and bottom sides.  This is an excellent chance to learn about and build your own audio amplifier.

See the kit Manual for schematic, assembly and operating instructions, and parts list.

This kit is based on the extremely versatile 555 multi-purpose timer integrated circuit.  This kit has been designed so that you may select either ASTABLE or MONOSTABLE modes of operation by simply populating the PCB with appropriate components included in the kit.  Astable is "free-running" and is used for an audio oscillator or LED flasher configuration of this kit.  Monostable is a "one-shot" and is used for a timer configuration of this kit. This kit will work with batteries or power source from 5VDC to 15VDC.
 

The  control, reset, trigger, and output signals of the 555 are routed to pads on the PCB so that you can connect to them and expand the capabilities of this kit.  This circuit is truly amazing with all the available options.  Use it in prototyping your designs or even as a stand-alone module for your  projects such as dark room timer, signal generator, flashing display,  games, audio source, connect it to a relay to control higher voltages, etc.  See the 555 timer Data Sheet for further information .

The  PCB is 1" x 2", double-sided, 0.062", FR-4, with silk screening on the top side, distributed ground on bottom side, and mounting holes.  This is an excellent chance to learn about and build your own oscillator/timer circuit.

See the kit Manual for schematic, assembly and operating instructions, and parts list.

The extensive capabilities of the micro-controller in this kit have been pre-programmed to provide temperature on-off control with digital set point. This kit is a great building block for projects to  monitor your computer fan air temperature, control fish or other tank temperatures, monitor your refrigerator, use in a gaming application,  control a fan for cooling, control a heating element, create a temperature controlled switch, set off a freezing or overheating alarm, implement a room or equipment temperature thermostat…    

Features of this kit include:

• Typical 3C accuracy, no calibration required  
• 7 switches to digitally select temperature set point in 0F or 0C, ranging from -10C to 100C  
• Dedicated output is activated at temperature set point and remains latched until reset  
• You can add your own circuits with surface mount and through-hole prototyping section on the PCB  
• Open collector output for connection to higher power circuits and relays  
• LED indicator of temperature set point  
• Small, 2.2" x 1.7", FR-4, 0.062" thick, double sided PCB with top side silk screen, and mounting holes  
• All micro-controller signals are accessible with through-hole pads at the edge of the PCB  
• Wide input voltage range (2.7V to 12V) with very low stand-by power, suitable for battery operation.  
• Switch select-able over or under voltage temperature trip point  

See the kit Manual for schematic, assembly and operating instructions, and parts list.

The extensive capabilities of the micro-controller in this kit have been pre-programmed to provide a versatile ambient light sensor.  It is also capable of being activated by a common red laser pointer for longer range, more accurate laser light control.  This kit is a great building block for projects to create a light or dark sensitive switch, door entry monitor, light tag or other gaming application, day or night controlled switch, a light or dark alarm, proximity detector, remote control by flashlight…
 

This kit can be used as a remote control by cell/mobile  phone.  The circuit is activated when the back-light of a cellular phone comes on with an incoming call.  There are no apps to download and in fact you don't need a smartphone, there are no special adapters or connectors required.  This kit is compatible with almost any cellular phone where the back-light is lit continuously (i.e. no flashing) while the cell phone is ringing.  The circuit turns on when 2 incoming calls are detected within one minute, and turns off when there is 1 incoming call within one minute.  You will want to adjust the back-light on your cell phone so it stays on for less than 45 seconds so 2 calls can be detected within one minute.  For best results when this kit is used as a remote control by cell phone it is set up out of direct light and the light sensor in this kit is pointed to the brightest part of your cell  phone display. 
 

Features of this kit include:

• Adjustable light and dark sensitivity 
• Switch select-able momentary or toggle output mode 
• Dedicated output is activated when light or dark is sensed and remains latched until reset  
• You can add your own circuits with surface mount and through-hole prototyping section on the PCB  
• Open collector output for connection to higher power circuits and relays  
• LED indicator for light or dark detection 
• Small, 2.2" x 1.7", FR-4, 0.062" thick, double sided PCB with top side silk screen, and mounting holes 
• All micro-controller signals are accessible with through-hole pads at the edge of the PCB 
• Switch select-able dark or light detection  
• Wide input voltage range (2.7V to 12V) with very low stand-by power, suitable for battery operation.  
• Special cell phone mode with timer for remote control by cell phone 

See the kit Manual for schematic, assembly and operating instructions, and parts list.

K105 Video Demo 

The extensive capabilities of the micro-controller in this kit have been pre-programmed to provide a versatile infrared light sensor. Wondering what to do with all those infrared remotes you no longer use?  This kit is a great building block for projects to create an infrared sensitive switch, test that your infrared remote control is functioning,  IR tag or other gaming application, infrared light beam monitor, a remote controlled switch, intruder alarm…
 

Features of this kit include:

• Works with practically any InfraRed (IR) remote control 
• Switch select-able momentary or toggle output mode 
• Dedicated output is activated when dark or infrared light is sensed and remains latched until reset  
• You can add your own circuits with surface mount and through-hole prototyping section on the PCB  
• Open collector output for connection to higher power circuits and relays  
• LED indicator for dark or infrared light detection 
• Small, 2.2" x 1.7", FR-4, 0.062" thick, double sided PCB with top side silk screen, and mounting holes  
• All micro-controller signals are accessible with through-hole pads at the edge of the PCB 
• Switch select-able dark or infrared light detection  
• Wide input voltage range (2.7V to 12V) with very low stand-by power, suitable for battery operation.  
• Special infrared (IR) remote control button double push mode with timer improves selectivity 

See the kit Manual for schematic, assembly and operating instructions, and parts list.

The extensive capabilities of the micro-controller in this kit have been pre-programmed to provide a versatile vibration sensor. This kit is a great building block for projects to create a vibration  sensitive switch, a remote controlled switch, intruder alarm, wind  detection, motion detection, a gaming application…
 

Features of this kit include:

• Switch select-able sensitivity 
• Switch select-able momentary or toggle output mode 
• Dedicated output is activated when vibration is sensed and remains latched until reset  
• You can add your own circuits with surface mount and through-hole prototyping section on the PCB  
• Open collector output for connection to higher power circuits and relays  
• LED indicator for vibration detection 
• Small, 2.2" x 1.7", FR-4, 0.062" thick, double sided PCB with top side silk screen, and mounting holes  
• All micro-controller signals are accessible with through-hole pads at the edge of the PCB 
• Wide input voltage range (2.7V to 12V) with very low stand-by power, suitable for battery operation.  

See the kit Manual for schematic, assembly and operating instructions, and parts list.

The extensive capabilities of the micro-controller in this kit have been pre-programmed to provide a timer with digital delay adjustment. This kit is a great building block for projects to create a time delayed switch, use in automobile for delayed lighting or wipers, as part of a gaming application, camera timer, on/off timing for appliances…
 

Features of this kit include:

• Better than 2.5% accuracy no calibration required 
• 8 switches to digitally select timing from seconds to days 
• Dedicated output is activated at the end of the time delay interval and remains latched until reset  
• You can add your own circuits with surface mount and through-hole prototyping section included on the PCB  
• Open collector output for connection to higher power circuits and relays  
• Activated by push button or electronic trigger 
• LED indicator of time delay interval 
• Small, 2.2" x 1.7", FR-4, 0.062" thick, double sided PCB with top side silk screen, and mounting holes  
• All micro-controller signals are accessible with through-hole pads at the edge of the PCB 
• Wide input voltage range (2.7V to 12V) with very low stand-by power, suitable for battery operation 
• Timer base period output provided 

See the kit Manual for schematic, assembly and operating instructions, and parts list.

This kit contains over 50 common SMD (Surface Mount Device) components providing  a great opportunity to learn and practice assembling with surface mount  electronics. There are 7 different SMD component types and similar components are easy to identify by the quantity of each type provided in the kit. To test that you have assembled the kit correctly, the circuitry functions as an LED (Light Emitting Diode) flasher. Whether you’re a beginner interested in practicing, experimenting, or learning about surface mount electronics or a professional interested in  teaching, training, or adjusting SMD re-flow process parameters this kit is a great fit. 

Features of this kit include

• Over 50 SMD components with ample spacing to facilitate assembly on the printed circuit board 
• Includes 7 types of common SMD components in a variety of sizes 
• LED indicator flashes to test that you have assembled the kit correctly 
• Each component type is clearly marked and located in sections on the printed circuit board 
• Compact, 2.2” x 1.7”, single sided Printed Circuit Board (PCB) with 4 mounting holes 
• Operates from a 9V battery (not included) 

See the kit Manual for schematic, assembly and operating instructions, and parts list.