Dancing Lights

Here is a simple circuit which can be used for decoration purposes or as an indicator. Flashing or dancing speed of LEDs can be adjusted and various dancing patterns of lights can be formed.The circuit consists of two astable multivibrators. One multivibrator is formed by transistors T1 and T2 while the other astable multivibrator is formed by T3 and T4. Duty cycle of each multivibrator can be varied by changing RC time constant. This can be done through potentiometers VR1 and VR2 to produce different dancing pattern of LEDs. Total cost of this circuit is of the order of Rs 30 only. Potentiometers can be replaced by light dependent resistors so that dancing of LEDs will depend upon the surrounding light intensity. The colour LEDs may be arranged as shown in the Figure

Serial Data Link Kits

This Transmitter Receiver kit can receive up to 64 characters via its serial port. The serial port baud rate is selectable from 300, 1200, 2400 and 9600. The data format is fixed at 8N1(8 data bits, no parity, 1 stop bit). Two input modes are available as well as input echo if required. An optional destination address can be automatically inserted into the message before transmitting.
Specifications:
Transmitter L: 2-3/8" W: 2" H: 7/8"
Receiver L: 2-3/8" W: 1-7/8" H: 7/8:
Power Requirement: 12 VDC(Need a Power Supply?)
Operates at 433.92 MHz. (uses amplitude modulation)
Up to 16 Receivers can be used in a Network
See the following documents for complete details, including schematic and theory of operation. Requires Adobe Acrobat Reader available at http://www.adobe.com/ for FREE!

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Parallel Data Link Kits

K175 monitors 8 digital inputs for change. If change is detected on any input the state of all the inputs is transmitted. An optional destination address can be added to the message before transmitting. The pinout of the input connector allows direct connection to a PC printer port.
Specifications:
Transmitter L: 2-3/8" W: 1-7/8" H: 7/8"
Receiver L: 2-3/8" W: 2-3/8" H: 7/8:
Power Requirement: 12 VDC(Need a Power Supply?)
Operates at 433.92 MHz. (uses amplitude modulation)
Up to 16 Receivers can be used in a Network
See the following documents for complete details, including schematic and theory of operation. Requires Adobe Acrobat Reader available at http://www.adobe.com/ for FREE!

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Audio Video Transmitter Kit

If it is desired to connect a video signal originating from a camera or other video source to a normal TV set, you will need this modulator. The audio and video signal is converted into a UHF TV signal so that the signal can be received through the TV antenna input. In certain countries (find out from your national telecommunications authority) it is permitted to use this modulator as a mini-transmitter by connecting a small antenna to it. With this facility it is possible to receive the signal from the video recorder or camera elsewhere within your home (range ~100'). The kit comes complete with housing and antenna connector. Specifications:
Input: rca style audio and video jacks
Output: UHF channel 21 (450 - 500MHz adjustable)
Power supply: 12 to 15V DC / 100mA(Need a Power Supply?)
Dimensions: 2.8" x 4.1" x 1.2"

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Digital Clock With Timer Kit

This circuit is a digital clock with a built-in 24-hour timer. It includes a one-piece LED display which provides a 4-digit display of hours and minutes, AM/PM and timer-on indicators. The timer includes a relay output which be connected to any external electrical device of up to 3A / 110V AC or 24V DC (1.5A / 220V AC).
Specifications:
Supply voltage: 12V AC C.T. (2 x 6V AC) / 300mA transformer
Output relay handles up to 3A / 110V AC or 24V DC (1.5A / 220V AC)
Display height: 15.2mm
50/60 Hz operation
Snooze function
PC board dimensions: 3.6" x 1.9" (93mm x 49mm)

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Outgoing Phone Number Logger

The logger records the start and stop time of ALL outgoing calls along with the number dialed (plus any other digits pressed during the call). There is no limit to the number of key presses it will log. It operates “stand alone” – no need for any connection to a PC. Telephone call data is output in a format that can be easily imported into Microsoft Excel. Various Excel functions can then be used to analyze and sort the data and produce formatted printouts. Data is stored in non-volatile EEPROM memory, so there is no loss of data in the event of a power failure - DIY KIT 164.
Specifications:
L: 5" W: 3-3/4" H: 1"
Requires 9 - 12 VDC Power Supply.(Need a Power Supply?)
3 Volt Lithium Back Up Battery (not included).
Stores up to 700 strings of (10 digit) numbers.(It will store as many digits that are pushed, there is no limit)
Download data to PC via Serial Port.
Use any terminal emulator program to get data.
Includes plastic case and all parts.

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Electronic Combination Lock Kit

This really is an excellent introduction to security devices. Set your own four digit code; any wrong key-in sequence resets the lock; correct sequence activates the relay (up to 240VAC contacts). A 9-digit key pad circuit board is separate and connects via ribbon cable, 30" supplied. Requires 12 VDC battery or supply - DIY Kit 29.
Specifications:
Main Board: L: 3" W: 2-3/8" H: 3/4".
Key Pad Board: L: 2-5/8" W: 1-1/4" H: 1/2".
Requires 12 Volt DC power supply.(Need a Power Supply?)
Relay contacts rated for 240VAC @ 12Amps.

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AM/FM Radio Kit and Training Course

"Superheterodyne" receiver of standard AM (amplitude modulation) FM (frequency modulated) broadcast frequencies. (PC board 11 5/8" x 5 1/4")
The unique design of this kit allows you to place the parts over its corresponding symbol in the schematic drawing on the surface of the printed circuit board. This technique maximizes the learning process while keeping the chances for an assembly error at a minimum.
This kit includes an assembly, lesson and theory of operation manual. The actual assembly is broken into simple sections. Each section should be completely tested before moving on. This reduces difficult trouble-shooting associated with many similar kits. Also included are practical hi-tech blue PC board with the schematic printed on the surface, and battery and solder included. The manual is easy to understand, no previous knowledge of electronics is necessary. This radio kit PC board has been designed so that no cabinet is necessary. A special bracket provides the necessary support to use the radio in any location, displaying the work achievement of the student.
Specifications:
Uses 14 Transistors and 5 Diodes.
PC Board Dimensions 11-5/8" x 5-1/4".
Operates on 9Volt battery (not included).(or Use this Power Supply instead of a Battery)
Includes complete course study guide.
Excellent for classroom trainer.

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PIC Programmer & Experiment Board

This electronic kit is a multifunctional Microchip PIC Flash Micro controller programmer with built in test circuit. You can create your programs and use the built in LED's and Push buttons to test and debug.
The code to program PIC's is written in standard ASCII and can be edited in any text editor or Microchip's MPLAB. We have also included a PIC16F627 so you can start programming and testing immediately.
Specifications:
Requires 12-15 Volt DC power supply.(Need a Power Supply?)
L: 5-3/4" W: 4" H: 3/4".
Supports 4 different 300 mil. PICs: 8p, 14p, 18p and 28p
Test buttons and LED indicators to carry out educational experiments, such as the enclosed programming examples.
PC connection through serial port.
Includes In Circuit Serial Programming (ICSP) connector.
Includes one Flash Microcontroller (PIC16F627) that can be reprogrammed up to 1000 times for experimenting at will.
CDROM Software to compile and program your source code is included minimum system requirements: IBM Compatible PC, Pentium or betterWindows™ 95/98/ME/NT/2000/XP
Rev 2.5 supports the following microcontrollers: PIC12F629, PIC12F675, PIC16C83, PIC16CR83, PIC16F83, PIC16C84, PIC16CR84,PIC16F84, PIC16F84A, PIC16F870, PIC16F871, PIC16F872, PIC16F873, PIC16F873A, PIC16F874, PIC16F874A, PIC16F876, PIC16F876A, PIC16F877(A)(ICSP only), PIC16F627, PIC16F627A, PIC16F628, PIC16F628A, PIC16F648A, PICF630, PIC16F676, PIC16F818, PIC16F819

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EEPROM Programmer Kit

Serial eeproms are finding more and more use in electronic devices. These small 8 pin devices offer non-volatile data storage and require minimal I/O lines to connect them. The programmer connects to the Parallel PC Port. The software runs under DOS, Win95, Win3.1, and WinNT (service pack 5).
Programs the following devices:2401, 2402, 2404, 2408, 24162432, 2464, 24128, 242569346, 9356, 9366, 9376, 9386
Specifications: L: 2-1/2" W: 2-1/4" H: 5/8" Requires external 9- 12 volt dc @ 50 mA power supply (Need a Power Supply?) Requires parallel port PC cable Link to download software provided Supports 8 bit eeproms only

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Bi-directional DC Motor Speed Controller (Kit or Assembled)

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.

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Three Digit Counter Module Kit

This electronic kit is a basic low cost counter module (DIY Kit1). Two or more may be plugged together with 6-pin sockets and harness provided. Excellent use as event counter. Has a single 3-digit display. Uses the 14553 and 14551 chips. Has count and reset switches with debounce built in to eliminate problems from noisy switches. Two or more may be joined to make 6 or 9 digit unit. Display may be located remotely. Plastic case included, 9 volt battery operation.
Specifications:
Main Board: L: 2-1/8" W: 3-1/4" H: 1-1/2"
Input Board: L: 1-1/4" W: 1-1/2" H: 1/2"
Requires 9 volt battery.(or Use this Power Supply instead of a Battery)

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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.
Specifications:
Metal detecting distance adjustable: up to 3.15"
Power supply: 9V battery (not included)
LED and buzzer indication
Dimensions: L: 2.2" x W: 2.5" x H 1.5"

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Cell Phone Remote Control Kit

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)

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Sound Activated Relay Switch

This mini-VOX - voice operated relay - is based on a circuit published in Silicon Chip, 9/1994, p31. We have improved it by putting an on-board Koa potentiometer in order to adjust the sensitivity. The idea behind a VOX is that instead of the user pressing a switch to activate a relay, the sound of the users voice itself activates the relay. This gives hands-free control over devices like lights and tape recorders. Relay stays on for 1 or 5 seconds (depending on components used) then shuts off. Different time values can be realized by using different value components (read k126.pdf for more information).
Specifications:
L: 2-1/4" W: 1-1/4" H: 5/8"
Requires 12 VDC Power Supply(Need a Power Supply?)
Current drain when off is 5-7mA and 35mA when activated
Relay output rated at 12/24VDC/1A (more info on how relays work)
Microphone can be connected on leads up to 2 feet away from the PCB.
Off time delay adjustable by changing component values.

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