AC Motor Speed Controller

Designed to control AC motors with carbon brushes (drilling machine, vacuum cleaner, saw, …). High torque, even at low r.p.m. May also be used for low voltage loads (24V). Supply and load circuit electrically isolated from one another.

Specifications:

L: 5" W: 3" H: 2"

Controls speed from about 5% to 95%

Board Requires 120VAC or 220VAC (Line cord not included) 

Load Supply can be from 24VAC to 220VAC @ 5.5Amps Max

Main and Load Power Supply are Galvanically Seperated

Includes Anti RF Interference Circuit

VEK2636 - AC Motor Controller

Bi-directional DC Motor Speed Controller

This DC motor controller kit allows controlling the speed of a DC motor in both the forward and reverse direction using pulse-width modulation (PWM). The range of DC motor control is from fully OFF to fully ON in both directions.  Turning the pot in the other direction causes the DC motor to spin in the opposite direction. The center position on the pot is OFF, forcing the motor to slow and stop before changing direction.  See our one direction DC Motor Controller.

Specifications:

L: 3-3/4" W: 1-5/8" H: 1".
Motor Speed Controlled via a potentiometer.
For DC motors 12 to 32 Volts DC @ 5 Amps as constructed. The IRFZ44 Mosfets can handle up to a maximum 49Amps, but PCB trace capacity would have to be beefed up with some hookup wire (underneath the PCB) soldered between the MOFSET pins and the screw terminal blocks.  If you are running beyond 5 Amps and the MOFSETS are getting hot, bigger heatsinks should be used.  You can also dissipate heat with a cooling fan directed over the heat sinks.
Requires operating voltage of 6 - 32 VDC.
(Need a Power Supply?)
This PWM DC motor controller circuit can be used for generating hydrogen, build your own fuel cell station.  More common uses include controlling DC motors in golf carts, buggies, RC cars, robotics, DC hobby motors, toy DC motors, etc.

See K166.pdf for complete details, including schematic and theory of operation.

K166 - Bi-directional DC Motor Controller

Mini Scrolling LED Sign

This is a great kit to help you build your electronics knowledge, plus when you're done building it you'll have a product that you'll actually use. No effort has been spared in designing a nice product.

This scrolling sign has 96 different characters, and can store messages up to 232 characters long. The messages are stored in memory even after power-down, so it'll be there when you turn it back on. The scroll rate is adjustable to 8 different speeds (including stopped) and you can manually scroll using the left and right buttons.

An intuitive 4-button interface that lets you enter messages quickly. You can also connect it directly to your computer and type in messages with your keyboard. Electronics enthusiasts will find this device a great tool when connected to another microcontroller.

This kit comes with all the parts you need to build a very cool scrolling LED sign, including a professional quality double sided circuit board, a programmed microcontroller (this kit is based on Microchip's PIC16F628A), and high brightness red LED displays (the image below gives no credit to the brilliant bright red). We even include extra parts to let you adjust the display brightness (and power consumption). A 7-9V 120mA power source is required. The kit includes a plug that can be soldered to any power wires (say, from a battery or old wall adapter). We also sell a power supply separately that already has the correct plug adapter.

Specifications:

Size: 8x24 pixels, 2.40"(61.9mm) x 1.71"(43.4mm) x .54"(13.8mm)
Display size: 8x24 pixels, .79"(20.0mm) x 2.36"(60.0mm)
Input Power: 7-9V, 120mA (Need a power supply?)
Comm Protocol: RS232, 19200baud, RS232 output option
See Mini Scrolling LED Sign Kit Instructions (PDF) for complete details, including schematic and theory of operation.

CKH001 - Mini Scrolling LED Sign Kit

Cell Phone Remote Control

Use this light activated circuit to turn equipment on and off at any location via GSM mobile phone.  Applications include turning on lighting, heating, opening your gate, simulating presence, controlling  animal feeders, activating car alarms, etc...  Ring detection circuit avoids phone charges and there is no need to open or modify phone, no physical connection to mobile phone.  Works with most GSM mobile phones.

Specifications:

L: 4" W: 1.7" H: 1"
Power supply: 12Vdc / 100mA
(Need a Power Supply?)
Dual operation mode: on/off toggle or on with auto turn-off timer
Timer settings: 0.5s, 2s, 30s, 1 min, 5 min, 15 min, 30min or 1 hour
Relay has Normally Open and Normally Closed Contact.
Relay Contact Max Current 3Amp @ 120VAC.
(more info on how relays work)
See VEMK160Assembly.pdf for complete details, including schematic and theory of operation.  See VEMK160Operation.pdf for operating instructions.

VEMK160 - Remote Control Via Cellular Phone

Three Light/Dark Activated Relay Switches

This kit has three separate circuits that allow you to open and close a switch based on the amount of light that the circuit senses. For example turn on a Flood Light when it gets dark, turn on a light when a door opens or closes, open or close blinds when it is day or night, etc..

Specifications:

Requires external 12VDC Power.
(Need a Power Supply?)
Relays have Normally Closed and Normally Open contacts rated up to 240 VAC @ 5 amps. (more info on how relays work)
See CK1602A.pdf for complete details, including schematic and theory of operation.

CK1000 - Light Alarm

Strobe Light

Flashing light effects for discos. Make your own snapshots and "lightning" light effects. Flash frequency adjustable from 5 to 15Hz (5 to 15 flashes per second).

Specifications:

L: 2-7/8" W: 1-7/8" H: 1"
Power: 110VAC (will require an old power cord)
5 to 15Hz (5 to 15 flashes per second)
See VEK5300.pdf for complete details, including schematic and theory of operation.

VEK5300 - Strobelight Kit

5 Channel Light Chaser

A versatile 5-channel AC light chaser that is easy to program. The circuit incorporates 5 jumpers that can be positioned on 2 different positions. The combination of different arrangements of these 5 jumpers will create numerous different light chasing effects. For example, if all 5 jumpers are positioned in the "A" mode, then each light will go on one after the other and will create a single moving light. Now if you change the position of all 5 jumpers to the "B" mode, you will have 4 channels on and 1 channel off at each moment and this will create another but different and interesting moving light. Other combinations of the "A" or "B" modes of the 5 jumpers will create different types of moving light effects.

Specifications:

Supply voltage: 9-12V DC / 100 mA
(Need a Power Supply?)
Includes adapter jack
Adjustable chasing speed
Up to 200W / 110V AC (400W / 220V AC) of lights per channel
5-LED channel indicator
PC board dimensions: 4.5"L x 2.5"W x 0.75"H
See CANCK289.pdf for complete details, including schematic and theory of operation.

CANUK289 - 5-Channel Multi-Program Light Chaser with Triac Board 

Traffic Stop Light

Miniature traffic light as used on four-way junctions. Realistic operation with adjustable delay. 12 LEDs. Great for model railroads, exhibitions, etc ...

Specifications:

L: 2.0" W: 1.4" H: 4.5"
Requires 9V Battery (Not Included)
(or Use this Power Supply instead of a Battery)
Low Power Consumption 15mA
On/Off Switch
See VEMK131.pdf for complete details, including schematic and theory of operation.

VEMK131 - Traffic Light

3 Channel IC Color Organ

This is an excellent item for parties, dances, etc. The circuit is based on an Integrated Circuit which provides three sharp active filters for each channel. Three independent controls vary the amount of light for low, midrange and high frequencies.

In addition, a built-in microphone is incorporated which allows the circuit to capture the ambient sound and to operate without requiring a connection to your stereo system.

The circuit can handle up to 200W of lights per channel at 110V AC (or 400W at 220V AC).

Specifications:

Supply voltage: 18V AC C.T. / 100 mA or 9 to 12 VDC
(Need a Power Supply?) (when using this power supply negative is connected to point marked G, and positive to A1 or A2.
Includes three 4A triacs and heat sinks
Up to 200W / 110V AC (400W / 220V AC) of lights per channel
Includes three 5A PC board mounted fuses
PC board dimensions: 3.54" x 4.01"
See CANCK185.pdf for complete details, including schematic and theory of operation.

CANUK185 - 3 Channel Color Organ

10 Channel Light Effect Generator

This Velleman Kit has 10, 12V/400mA outputs to control cold-cathode fluorescent lamps, light bulbs, LED's or "solid state" relays.  For use as advertisement lighting, party lights, discos, eye-catcher etc... Ten pre-programmed selectable light patterns with a push button.

Specifications:

Supply voltage: 12V DC up to 4 amps max (good for auto use)
Outputs: 12V DC / 400mA per channel (total : max 4A)
Dimensions: 5.5" x 3.9" x 1.1"
Number of used channels is selectable
Speed is adjustable
LED indicator for each output
See VEK8044.pdf for complete details, including schematic and theory of operation.
See VEVM120.pdf for operational instruction.

VEK8044 - 10 Channel Light Effect Generator

Hybrid Stereo Amplifier 2 x 25 Watt (RMS)

This complete high quality, low noise stereo audio power amplifier is based around the Hybrid Integrated Circuit STK4392 manufactured by Sanyo. The circuit incorporates volume and balance controls and has a maximum music output power of 35W per channel (25W per channel RMS). The circuit incorporates an on board power supply; therefore, only an appropriate transformer is required to power the circuit.

Specifications:

Supply voltage: 24 to 32V AC Transformer / 2A
or 24 to 32VDC at 2A
Input sensitivity: 300mV
Output power using 32V AC:
Music power – 2 x 35W / 4 Ohm
RMS power – 2 x 25W / 4 Ohm
Includes volume and balance controls
Maximum distortion: < 0.2%
Frequency response: 30Hz to 30KHz
PC board dimensions: 4.5"L x 2"W x 2.75"H
See CANCK260.pdf for complete details, including schematic and theory of operation.

CANUK260 - 2 x 25W (RMS) Hybrid Stereo Power Amplifier (assembled)

25 Watt Hi-Fi Audio Amplifier

This kit contains the essential components needed to build a high fidelity amplifier module using the National Semiconductor LM1875 IC. With the addition of a handful of parts and a suitable power supply, this module will deliver 25W RMS into 8 ohms @ 1% THD.

Specifications:

L: 2" W: 2-1/8" H: 3/4"
Requires external -25 and +25 VDC Power Supply
(See K114)
Up to 30W output power into 8 ohms
Typical THD of 0.015% @ 1kHz, 20W output
Short circuit protection
94dB supply rejection ratio
Built-in thermal protection
See K50.pdf for complete details, including schematic and theory of operation.

K50 - 25 WATT HIFI AUDIO AMPLIFIER KIT

18 Watt Mono Amplifier

A high quality electronic audio amp that can operate on a low voltage, 12 VDC recommended. Uses the Hitachi HA 13001 IC and a dozen external components for a compact and powerful monaural amplifier. Will drive two 4 or 8 ohm speakers. Two can be used for stereo.

Specifications:

L: 2-1/4" W: 1" H: 1-1/2"
Requires external 12 VDC Power Supply
(Need a Power Supply?)
Output up to 18 watts
See CK706.pdf for complete details, including schematic and theory of operation.

CK0706 - 18 Watt Mono Amplifer Kit

10 Watt x 10 Watt Stereo Amplifier

This class AB stereo audio power amplifier is designed for quality hi-fi applications using a TDA2009A module. It is easy to construct and has a minimum of external components. The module has output current and thermal protection. This is the data book circuit which outputs excellent sound. The supply voltage for this kit is 8 - 24V DC at 1 to 2 Amps.  Maximum output power will only be obtained with a power supply of at least 20V and greater than 1.5 A, and using 4 ohm speakers.  Powerful enough to power a stereo for a mid-sized room and more than enough for use in an automobile.

Specifications:

L: 3" W: 1-3/4" H: 1-1/2"
Requires external 8-24 VDC Power Supply
(Need a Power Supply?)
Output up to 10 watts per channel

See CK708.pdf for complete details, including schematic and theory of operation.

CK0708 - 10 Watt Stereo Amplifier Kit

6-10 Watt Stereo Amplifier

Kit 143 is a class AB stereo audio power amplifier designed for quality hi-fi applications using a TDA2005 module. It is easy to construct and has a minimum of external components. The module has output current protection and thermal protection. This is the data book circuit which produces an excellent sound. The supply voltage required for this kit is 8 - 18V DC at 1 to 2 Amps. Maximum output power will only be obtained with a power supply of at least 2A at 15V DC, and using 2 ohm speakers (or 2 by 4 ohm speakers in parallel). However approximately 4W per channel can be obtained with only a 15V DC, 1A supply into 4 ohm loads. The power supply should be well filtered to reduce mains hum, the on board capacitors alone are not adequate for this purpose but are necessary to ensure stability. Extra filtering is unnecessary if operating from a battery.

We spent a lot of time getting the tracks right on this single sided PCB to get the lowest possible THD. Getting the separate tracks to the earth pin is the secret.

Specifications:

L: 3" W: 1-7/8" H: 1"
Requires external 8-18 volt DC @ 2 Amps for Max Output
(Need a Power Supply?)
Frequency response : ~ 15 Hz to 50 kHz, –3 dB

See K143.pdf for complete details, including schematic and theory of operation.
  K143 - 6-10 WATT STEREO AMPLIFIER KIT

Hybrid Stereo Amplifier 2 x 35 Watt (RMS)

This complete high quality, low noise stereo audio power amplifier is based around the Hybrid Integrated Circuit STK4432 manufactured by Sanyo. The circuit incorporates volume and balance controls and has a maximum music output power of 55W per channel (35W per channel RMS). The circuit incorporates an on board power supply; therefore, only an appropriate transformer is required to power the circuit.

Specifications:

Supply voltage: 30 to 36V AC transformer / 2 to 3A
or 30 to 36 VDC at 3 Amps - NOT INCLUDED
Input sensitivity: 300mV
Output power using 36V AC:
Music power – 2 x 55W / 4 Ohm
RMS power – 2 x 35W / 4 Ohm
Includes volume and balance controls
Maximum distortion: < 0.2%
Frequency response: 30Hz to 30KHz
PC board dimensions: 4-3/4"L x 2-1/8"W x 2-3/4"H

See CANCK290.pdf for complete details, including schematic and theory of operation.
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