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Indicators and testers

Continuity Tester

Two range tester will buzz up to 3 ohm LO range, and 185 ohm HI range. You can set your own ranges by changing resistor values connected to the LM324 quad op-amp. Full circuit description, PCB and components supplied. A Continuity Tester is one of the most useful pieces of test equipment to have. It is used for testing the electrical path (continuity) between two points. It is more useful and efficient than using a multimeter to do the same job. This Continuity Tester has an audible output so you can keep your eyes on the probe tips while working. In addition it will only 'buzz' through a specified resistance or less. Above this value the tester will not make any sound. A switch is provided to allow this resistance to be varied. The Tester runs from a 9V battery (not supplied). The tester will 'buzz' up to about 2.8 ohm for the LO position and up to 185ohm for the HI position (this may vary slightly due to component tolerances). PCB size: 51mm x 38mm (2" x 1.5"). (CPS110)

Quantity	Price
1 – 9	$13.68
10 – 99	$12.96
100 +	$11.88

Skill Level of Item:		(Kit - Basic Soldering Required)
Product #		CPS110
Quantity Available:		10

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General Purpose 3 1/2 digit panel meter

Voltage is the most frequently measured electrical quantity. Full instructions included in this kit to make your own 3 1/2 digit panel meter for any standard or non standard range. Can also measure current and resistance. Many components located underneath the LCD and 7106 on the PCB. Double sided board. PCB size: 53mm x 56mm 2.09” x 2.20” Working voltage 9V DC. (CPS127)

Quantity	Price
1 – 9	$25.68
10 – 99	$23.85
100 +	$23.06

Skill Level of Item:		(Kit - Basic Soldering Required)
Product #		CPS127
Quantity Available:		6

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Introduction to LCDs kit

The aim of this kit is to show how to use a 16x2 alphanumeric Liquid Crystal Display (LCD) with a PC. First we show how to connect it to the parallel port and echo and handle keyboard input. Then we show how to use the LCD to display temperature from a DS1620 Digital Thermometer / Thermostat chip and set the HI & LO triggerpoints in it. All C source code is provided. PCB size: 3 1/4"x2 3/4".

Quantity	Price
1 – 9	$46.51
10 – 99	$43.20
100 +	$41.76

Skill Level of Item:		(Kit - Basic Soldering Required)
Product #		CPS134
Quantity Available:		3

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Wind Speed Meter Kit

"This is a Kit of the no-moving parts Wind Speed Meter. We have redrawn the PCB so that the 2x16 LCD fits on top of the main PCB. The schematics have been redrawn but we have kept the same Component Designators. An Off/on switch and input protection diode have been added. Ten mm nylon standoffs in each corner raise the PCB and allow the two switches S2 and S3 to come out. Also access to VR1 and VR2 is easy since both trimpots are mounted underneath the PCB. Access to test points with a CRO is also easy with this arrangement. We did not keep the In Circuit Programming header." (CPS168)

Quantity	Price
1 – 9	$58.14
10 – 99	$53.99
100 +	$52.19

Skill Level of Item:		(Kit - Basic Soldering Required)
Product #		CPS168
Quantity Available:		4

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LCD Temperature Meter kit (incl Box)

Introduces 3 1/2 digit LCD and the very popular 7106 IC. This IC has been used in low-cost multimeters for over 13 years. We use it to measure temperature using an ordinary signal transistor as the sensor. Data sheets are provided as is a breadboard area so you can extend the circuit to build your own voltmeter, ammeter, resistance meter or extended-range temperature meter. Takes away the mystery of how multimeters work. Box provided. 9V battery operation.(CPS2)

Quantity	Price
1 – 9	$27.13
10 – 99	$25.20
100 +	$24.36

Skill Level of Item:		(Kit - Basic Soldering Required)
Product #		CPS2
Quantity Available:		6

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Logic Probe

This is the most important piece of equipment for testing and measuring digital equipment. It is usually used in fault finding and testing but can also assist in design work and in finding out how digital equipment works. Switch for either TTL or CMOS. Modern design using a PUT. Includes detection circuit for very fast pulses. Gives visual (3 LED's) and audio (piezo buzzer) response.(CPS24)

Quantity	Price
1 – 9	$14.82
10 – 99	$14.04
100 +	$12.87

Skill Level of Item:		(Kit - Basic Soldering Required)
Product #		CPS24
Quantity Available:		3

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General 3 1/2 Digit Panel Meter (use 7106 IC)

Make this general purpose 3 1/2 digit LCD panel meter into your own voltage or current meter or custom-make it to measure voltage input from a transducer. Full details are given in the documentation. Uses the very popular 7106 IC. The LCD section of the PCB may be cut off and mounted separately. Decimal Point selectable. Terminal strips input. Working voltage 9V DC.(CPS34)

Quantity	Price
1 – 9	$27.13
10 – 99	$25.20
100 +	$24.36

Skill Level of Item:		(Kit - Basic Soldering Required)
Product #		CPS34
Quantity Available:		3

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LED 3 1/2 digit panel meter kit

Make this general design 3 1/2 digit LED panel meter into your own voltage or current meter. Or customize it to measure input from a transducer. Two PCB's allow low-profile end-on viewing. All instructions to assemble and operate meter are included. Meter can directly input an offset voltage, for example from a weighbridge, use non-standard voltage inputs, measure current or high voltages.(CPS61)

Quantity	Price
1 – 9	$28.59
10 – 99	$26.55
100 +	$25.67

Skill Level of Item:		(Kit - Basic Soldering Required)
Product #		CPS61
Quantity Available:		6

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Stereo VU Meter

Simple, low cost stereo VU meter. Two LM3915 dot/bar display driver ICs used to drive 2 rows of 10 LEDs(14 green,6 red)in a moving bar display. Each row of LEDs spans a power range of 0-30 dB in ten 3-dB steps. This VU meter indicates 'peak music power' when used with audio amp. Ideal add-on for any amplifier kit. PCB size: 65mm x 42mm.(2.6" x 1.65") This VU meter is capable of monitoring and displaying power levels present at the speaker terminals of a stereo audio power amplifier. Levels are displayed in ten discrete steps. This meter is not designed to give an accurate display of the power levels. It is designed to give an approximate visual indication of the audio power output of each channel. For many situations-disco, parties- this is all which is required: the flashing LED's add atmosphere to the situation. No calibration required. The kit is constructed on single-sided printed circuit board. It contains two identical circuits, one for each channel of the amplifier.(CPS89)

Quantity	Price
1 – 9	$19.95
10 – 99	$18.90
100 +	$17.33

Skill Level of Item:		(Kit - Basic Soldering Required)
Product #		CPS89
Quantity Available:		9

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8 INPUT PROGRAMMABLE MESSAGEBOARD WITH LCD & SERIAL INTERFACE

Features
add an LCD display to any low-tech application and make it look high-tech !
replace up to 9 indicators or lamps by one single backlit LCD
recall messages simply by pressing a button
inputs accept dry contacts, open collectors and logic levels
no programming skills required !
store up to 9 sixteen-character messages in non-volatile EEPROM memory
4 operating modes:
1): display the status of all inputs simultaneously
2): display all active inputs
3): display active input with highest priority
4): display text messages in a 'tickertape'-fashion
a default message can be entered which is displayed when no inputs are active
messages can be transferred to the K8045 from any PC or terminal
message transfer software is available from www.velleman.be
wireless data transfer between PC/terminal and K8045 is possible with optional RX/TX433 modules
1 on-board pushbutton available for your application
(K8045)

Quantity	Price
1 – 9	$45.20
10 – 99	$41.99
100 +	$40.59

Skill Level of Item:		(Kit - Complex Soldering Required)
Product #		K8045
Quantity Available:		2

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LCD MINI MESSAGE BOARD

Features

miniature message board with 16 character 1 line LCD display
message scrolls from right to left with adjustable speed
applications: at exhibitions, for advertising, to greet visitors at the front door, as name tag, ...
46 character message memory
possibility to add pauses during scrolling

Specifications

power supply: 2 AAA battery (not incl.)
dimensions: 3.9" x 1.5" x 1.3"
(MK157)

Quantity	Price
1 – 9	$26.74
10 – 99	$24.84
100 +	$24.01

Skill Level of Item:		(Kit - Basic Soldering Required)
Product #		MK157
Quantity Available:		5

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DIGITAL TACHOMETER

For cars or motorcycles with a petrol engine. May be used as a general purpose revolution counter.

Specifications

range: 100 - 9900 revolutions/minute
2 digit display
easy calibration
power supply: 10 - 15V DC / 200mA
PCB dimensions: 3.2" x 1.8" + 3.2" x 2.4"
front panel dimensions: 2.8" x 3.5"

Extra Info
- Hints

See special instructions in manual for use with electronic ignition.
(K2625)

Quantity	Price
1 – 9	$28.49
10 – 99	$26.46
100 +	$25.58

Skill Level of Item:		(Kit - Basic Soldering Required)
Product #		K2625
Quantity Available:		6

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HANDHELD LCD OSCILLOSCOPE

This handheld scope features options never seen in its category. It is packed with handy features which enables you to perform on-the-spot measurements quick, easy and accurate. Its high-contrast, wide viewing angle LCD screen enables operation under normal daylight conditions. All functions are accessible by means of a tactile keyboard with a pleasant touch feeling. The current operating mode is displayed on-screen. If desired, auto-setup mode takes care of all scope settings for instant visualisation of waveforms. The marker function enables you to make accurate measurements of voltage, time and frequency. Acting as a DVM, it displays True rms, dB, peak-to-peak and DC volts. With its built-in variable gain sine generator, it allows easy service of audio equipment, etc.… Probe transient response can be adjusted using the calibration output. (K7105)

Quantity	Price
1 – 9	$208.92
10 – 99	$205.25
100 +	$197.92

Skill Level of Item:		(Kit - Complex Soldering Required)
Product #		K7105
Quantity Available:		1

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GENERAL PURPOSE TEMPERATURE SENSOR

Applications
measure indoor and outdoor temperatures, control heating and/or cooling of rooms, equipment, etc... Monitor temperatures in processes, put a temperature readout on your website, check your pools temperature, ...

Specifications
range: -20° ~ +70°C
output: 0 ~ 20mA current loop
output voltage compliance: 10V
accuracy: 2° full range
one single adjustment
3-wire system: GND, +V and OUT
power supply: 12VDC for 0 ~ 5V OUT / 15VDC for 0 ~ 10V OUT
current consumption: 30mA max.
dimensions: 55 x 35 x 15mm (2.2" x 1.4" x 0.6")
(K8067)

Quantity	Price
1 – 9	$18.31
10 – 99	$17.01
100 +	$16.44

Skill Level of Item:		(Kit - Basic Soldering Required)
Product #		K8067
Quantity Available:		5

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UNIVERSAL TEMPERATURE SENSOR

Features
applications:
measure indoor and outdoor temperatures
monitor heating and/or cooling of rooms, equipment, etc...
monitor temperatures in processes
put a temperature readout on your website
check your pools temperature...

Specifications
range: -20°C (-4°F)... +70°C (+158°F)
output: 0..20mA current loop
output voltage compliance: 10V
one single adjustment
3-wire system (GND, +V and OUT)
power supply:
12VDC for 0..5V OUT
15VDC for 0..10V OUT
current consumption: 30mA max.
dimensions: 55x35x15mm /2.17" x 1.38" x 0.59"
(VM132)

Quantity	Price
1 – 9	$23.40
10 – 99	$21.74
100 +	$21.01

Skill Level of Item:		(Assembled and Tested)
Product #		VM132
Quantity Available:		3

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Dual Amplifier as a kit

Often you want a simple amplifier to amplify or annunciate the signal you are feeding into a data acquisition system. For example you have a signal from a temperature sensor that is providing 10mV/deg but you are only operating over 0-40 degrees giving an effective span of 0 to 0.4V. Your data acquisition system accepts a signal of 0 to 10V so you would like to amplify your signal by 10 to get better resolution. Or you may have a 48V battery that you wish to monitor with a data acquisition system that has a 0 to 5V input range. You could use a simple voltage divider but the input impedance of the data acquisition is only a few kilo ohm. Or you may have a 4-20mA signal you wish to convert to 2 to 10V or 1 to 5V This Dual DC amplifier provides a solution to these problems and more

The dual DC amplifier circuit consists of two non inverting amplifiers (OP1 and OP2) with a voltage divider at the input. Each amplifier is identical in design and is issued with one 50K potentiometer. Whether the circuit amplifies or reduces the amplitude of the signal depends on where the 50K potentiometer is placed on the circuit. A simple jumper allows the circuit to operate off a 9 to 24V supply for amplification of unipolar signals or it can be powered by a +/-9 to 15V supply for amplification of bipolar signals.

Quantity	Price
1 – 9	$26.85
10 – 99	$24.94
100 +	$24.11

Skill Level of Item:		(Kit - Basic Soldering Required)
Product #		BB290
Quantity Available:		3

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WATER ALARM

Gives alarm sound when water is detected. Incorporated alarm buzzer. Water sensor can be placed at a distance by cutting the board and using wires to connect the sensor.

Specifications

power supply: 9V battery (not incl.)
dimensions: 1.8" x 2.8"
(MK108)

Quantity	Price
1 – 9	$4.28
10 – 99	$4.05
100 +	$3.71

Skill Level of Item:		(Kit - Basic Soldering Required)
Product #		MK108
Quantity Available:		9

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CABLE POLARITY CHECKER

Check cables for continuity and identify individual wires. Ideal for speaker cable polarity checking. LED indication for open circuit, shorts and correct or wrong polarity. Pushbutton operation with auto power off.

Specifications

low power consumption: 10mA max.
power supply: 9V battery operated (not incl.)
dimensions:
main board: 2.2" x 1.6" x 1.3"
remote board: 1.6" x 0.3"
(MK132)

Quantity	Price
1 – 9	$7.18
10 – 99	$6.80
100 +	$6.24

Skill Level of Item:		(Kit - Basic Soldering Required)
Product #		MK132
Quantity Available:		10

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IR REMOTE CHECKER

NEW - LOWER PRICE!
Price was: $5.56

The easy way to check your IR remote for proper operation. Simple operation : point the remote at the sensor and push any button. 4 flashing LEDs indicate remote operation.

Specifications

low power consumption
power supply: 9V battery (not incl.)
dimensions: 2.2" x 1.2" x 1.3"
(MK137)

Quantity	Price
1 – 9	$4.99
10 – 99	$4.78
100 +	$4.38

Skill Level of Item:		(Kit - Basic Soldering Required)
Product #		MK137
Quantity Available:		10

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PARKING RADAR

If you have problems parking then this kit is for you. Using (ultrasonic) sound waves, whose frequency is beyond our range of hearing, we can "measure" a distance. Consequently, a sensor mounted at the back of the car can give an indication of the distance between your car and the car parked behind you or other obstacles (only at the same height as the sensor). When the preset minimum distance is crossed, an audible signal is generated. (K3502)

Quantity	Price
1 – 9	$36.26
10 – 99	$33.68
100 +	$32.56

Skill Level of Item:		(Kit - Basic Soldering Required)
Product #		K3502
Quantity Available:		4

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FROST INDICATOR

Drive more safely in freezing weather. This kit uses a flashing LED to indicate a road temperature close to freezing point ; below that point the LED is on continuously. A reliable temperature sensor with mounting stud is included.
(K2644)

Quantity	Price
1 – 9	$13.85
10 – 99	$13.12
100 +	$12.03

Skill Level of Item:		(Kit - Basic Soldering Required)
Product #		K2644
Quantity Available:		3

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METAL DETECTOR KIT

To come up against an electric cable while drilling a hole in a wall can have catastrophic consequences. Likewise, drilling into gas, water pipes or central heating pipes can be extremely hazardous. With a handy metal detector it can now be determined beforehand whether there are metal objects to be found in a wall, ceiling or floor. An LED indicates if a metal object is in the vicinity. If an audio signal is also desired, space has been provided on the PCB for buzzer type SV4/12-S to be connected. The PCB has been specially constructed to fit entirely into to the separately available box type G407.

Specifications
metal detecting distance adjustable: up to 3.15"
power supply: 9V battery (not incl.)
LED indication (optional buzzer SV4/12-S)
dimensions: 2.2" x 2.5"
recommended housing: G407
(K7102)

Quantity	Price
1 – 9	$14.96
10 – 99	$14.18
100 +	$12.99

Skill Level of Item:		(Kit - Basic Soldering Required)
Product #		K7102
Quantity Available:		8

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TELEPHONE RING DETECTOR WITH RELAY OUTPUT (KIT)

Features
simply connect in parallel with phone line
powerful led flashes when phone rings
the unit will feature a relay output if connected to a 12VDC power supply
relay output: continuous or on/off to the rhythm of ringing of the telephone
complete with enclosure
great for noisy environments, for the hearing impaired, as addional ringer, to replace existing ringer, ...
accepts standard adaptor & telephone plug
includes:
attractive enclosure
adhesive strips for easy fixing
Specifications
10.000 mcd led !
connects to PSTN line
RJ11 connector
supply: 12VDC/100mA adapter (Ex. PS1203)
output Contact (NO): 1A max.
dimensions: 80x55x35mm / 3,15 x 2,16 x 1,37"
(K8086)

Quantity	Price
1 – 9	$28.34
10 – 99	$26.33
100 +	$25.45

Skill Level of Item:		(Kit - Basic Soldering Required)
Product #		K8086
Quantity Available:		7

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TELEPHONE RINGER WITH BUZZER AND LED

Features
accepts standard telephone plug
simply connect in parallel with phone line
no power supply necessary!
buzzer sounds and powerful led flashes when phone rings
great for noisy environments, for the hearing impaired, as additional ringer, to replace existing ringer,...
includes:
attractive enclosure
adhesive strips for easy fixing

Specifications
10.000 mcd led !
connects to PSTN line
RJ11 connector
consumption: 10mA max.
dimensions: 80 x 55 x 35mm
(K8087)

Quantity	Price
1 – 9	$25.44
10 – 99	$23.63
100 +	$22.84

Skill Level of Item:		(Kit - Basic Soldering Required)
Product #		K8087
Quantity Available:		4

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TELEPHONE RING DETECTOR WITH RELAY OUTPUT (Assembled)

Features

simply connect in parallel with phone line
powerful led flashes when phone rings
the unit will feature a relay output if connected to a 12VDC power supply
relay output: continuous or on/off to the rhythm of ringing of the telephone
complete with enclosure
great for noisy environments, for the hearing impaired, as addional ringer, to replace existing ringer, ...
accepts standard adaptor & telephone plug

Specifications

10.000 mcd led !
connects to PSTN line
RJ11 connector
supply: 12VDC/100mA adapter (Ex. PS1203)
output Contact (NO): 1A max.
dimensions: 80x55x35mm / 3,15 x 2,16 x 1,37"

Quantity	Price
1 – 9	$45.79
10 – 99	$42.53
100 +	$41.11

Skill Level of Item:		(Assembled and Tested)
Product #		VM144
Quantity Available:		5

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TELEPHONE RINGER / FLASHER

Add an extra ringer to your phone.

Features

3 operation modes: flasher only / flasher + soft buzzer / flasher + hard buzzer
easy installation, just plug it in
no battery required
wall mounting is possible
only suitable for use with PSTN telephone lines
(TELRI)

Quantity	Price
1 – 9	$6.84
10 – 99	$6.48
100 +	$5.94

Skill Level of Item:		(Assembled and Tested)
Product #		TELRI
Quantity Available:		4

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MULTIFUNCTION CAR INTERIOR ILLUMINATION

If, like most of us, you do not have infrared eyesight, then at times
you have probably found yourself fumbling for the ignition switch or
seat belt in the dark. For people like you we have developed this
solution. With extra push button and battery protection.

Quantity	Price
1 – 9	$15.63
10 – 99	$14.51
100 +	$14.03

Skill Level of Item:		(Kit - Basic Soldering Required)
Product #		K3500
Quantity Available:		4

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