This Kit shows how much of electronics today can be contained in a single chip, the Intersil 7106. Commercial low cost digital volt meters are nothing more than this kit, some switches and passive components and a nice plastic case.

COMPONENTS

• Resistors 1% metal film:
• 1M brown black black yellow 2
• 22K red red black red 1
• 47K yellow violet black red 1
• 100K brown black black orange 3
• 220K red red black orange 1
• Capacitors:
• 100p 101 monoblok 1
• 220n 224 metallized 1
• 10n 103 mylar 1
• 100n 104 mylar 1
• 470n 474 metallized 1
• BC547 or BC548 2
• 10 turn trimpot 2
• 40 pin IC socket 3
• 7106 IC 1
• hookup wire
• 9V battery snap 1
• Box #2 and screws 1
• LCD VI302-DP-RC 1
• Kit 2 PCB 1"

$29.88

Logic Probe Kit - DIY

An important piece of equipment for test & measurement of digital equipment. Can be used in fault finding & testing as well as to assist in design work & to find out how digital equipment works. Switch for either TTL or CMOS. Our own modern design using a PUT. Includes detection circuit for very fast pulses. Gives visual (3 LEDs) and audio (piezo buzzer) response. 

Terrific Starter Kit.

sales@twinind.com for availability

An introduction to a basic combination lock. Separate touch pad with 9 pads.  Lock is reset if an incorrect digit is pressed. Relay capable of switching 250V.  12V operation.

$19.90

Five Ultra Bright LED Flasher Kit - DIY

This CMOS VLSI single chip-on-board is designed for electronic toy and warning light applications.  Five LEDs flash on/off in a pseudo-random or sequential mode, depending on whether a switch is open or connected high.  Continuous flashing mode or toggle on/off is selectable by another switch.  The flash rate is controlled by a trimpot.

$16.25

Kit 61 has been designed as a versatile 3 1/2 digit panel meter with these considerations in mind. Also in this Kit we have used small, monoblock capacitors rather than the much bigger mylar or metallized types. This saves space as well as making the meter look better.

$37.67

Big PIC Clock Kit - DIY

The Big PIC Clock is based on a PIC16F84 microcontroller (uC.) The software in the uC allows for very accurate timekeeping. For visibility at a distance it uses 2.3/57mm super large, hi-efficiency red LED displays for the hours and minutes and smaller 0.56 LED displays for the seconds. The circuit incorporates a dimming feature so that at night the reduced ambient light is sensed and the display is dimmed.

COMPONENTS

• Tinned copper wire 12"
• Resistors 5%, 1/4W:
• 10R R3 1
• 82R R11 12 14 15 16 17 18 7
• 180R R11 1
• 220R R9 10 19 20 21 22 23 7
• 470R R5 24 25 26 27 28 29 30 31 9
• 1K R7 1
• 2K2 R2 1
• 4K7 R4 1
• 10K R6 1
• 470K R8 1
• Zero ohm resistors for links on K73b 4
• 2R2 1W R1 1
• 0.1 104 box poly MKT C10 1
• 1n5 box poly MKT C9 1
• 1N4004 D1 2 3 4 4
• 1N4148 D5 D6 2
• 4.000MHZ Xtal 1
• 10uF/25V mini C1 2 3 4 6 5
• 100uF/16V mini C5 1
• 15V 1W zener diode ZD1 1
• 27p ceramic NPO type C7 C8 2
• LDR LDR 1
• BC328 Q1  Q8 8
• 4051 IC2 1
• PIC16F84 IC1 1
• ULN2003A IC3 1
• 7905 IC4 1
• 20 pin IC socket 1
• 18 pin IC socket 1
• 16 pin IC socket 2
• 0.05 Metal Pins 8
• 3mm x 6mm nut and bolt set 1 set
• Metal spacer 3mm x 15mm 4
• 3mm screws x 6mm 8
• 2 pin SIL header 1
• jumper 1
• LED 0.56" display 2
• LED 2.3" display 4
• 8 pin female header 3
• 8 pin male SIL strip 3
• K73A PCB 1
• K73B PCB 1

$99.99

Continuity Tester Kit - DIY

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. 

PARTS LIST - KIT 110

Resistors (0.25W carbon, 5%)

• 1K2 brown red ..................R8..................... 1
• 1K5 brown green ...............R1..................... 1
• 2K7 red violet ...................R4..................... 1
• 39K orange white orange........R9,10.............. 2
• 47K yellow violet range........R5.................... 1
• 100K brown black yellow.......R6,7.................. 2
• 270K red violet yellow ...........R3................... 1
• 2M2 red red green ..................R2.................. 1

Capacitors

• 1.8nF polyester ...................C2 ..................... 1
• 4.7nF polyester ...................C3 ..................... 1
• 47nF polyester ....................C1 ..................... 1
• 10uF 16/25V electrolytic ....C4,5 ..................... 2

Semiconductors

• LM324, Quad Op-Amp.........IC1....................... 1
• 1N4148 diode .....................D1....................... 1
• Miscellaneous
• Slide switch.......................SW1,2................. 2
• Piezo external drive buzzer........................... 1
• 9V battery harness ............................... 1

PCB,

• K110............................................ 1

$9.99

Introduction to LCD's Kit - DIY

Learn how to connect a 2x16 LCD to a PC parallel port. First this kit will show you how to write keystrokes from the PC keyboard to display on the LCD. It will show you how to process this data (rotate the string left and right.) All the code is provided. Second, there is an on-board DS1620 to measure temperature. The temperature is displayed in F or C. Just press a button to display either. With the DS1620 you may set breakpoints to turn a thermostat on/off. We provide all the code to do this. Once the DS1620 is programmed it may be removed and placed in another device for temperature control. Many web references are provided.

obsolete. sales@twinind.com for info.

Microcontroller-based timer with seven timer modes:

• Instant On, Delayed Off, Level Triggered
• Instant On, Delayed Off, Edge Triggered
• Delayed On
• Instant On and Hold, Delayed Off
• Toggling
• Instant On, Delayed Off, with Pause
• Delayed On with Pause

$29.88

Message Recorder Kit - DIY

Message Recorder. This kit will take ISD DIP chips from ISD1700 series. Powered by 8-24V DC (power supply not included)

COMPONENTS

Resistors:

• 680R blue grey brown R5 R6 2
• 1K brown black red R7 1
• 4K7 yellow violet red R2 1
• 10K brown black orange R8 R9 2
• 22K red red orange R3 R4 2
• 100K brown black yellow R10 R11 2
• 470K yellow violet yellow R1 1

Capacitors:

• 0.1 Monoblock 104 C1 C2 C4 C6 4
• 1uF electrolytic mini C7 1
• 4.7uF elcap C8 1
• 100uF elcap C3 1
• 220uF elcap C5 1

BC547 Q1 Q2 2

BC557 Q3 1

ISD1700 Series IC 1

28 pin IC socket 1

1N4148 diode 1

2 pole terminal block 2

Electret Microphone 1

Hat keyswitch 2

5mm LED 2

PCB (dim = 2.75" x 2.0")

SPDT PCB mounted switch 2

$39.98

PROGRAMMER FOR SERIAL EEPROMs KIT - DIY

Serial eeproms are finding more and more use in electronic devices these days. These small 8 pin devices offer non-volatile data storage and require minimal I/O lines to connect to them. This makes them ideal in many microcontroller based applications.

The programmer connects to the PC parallel port and is controlled by driver software running on the PC.

PARTS LIST - KIT 151

Resistors (0.25W carbon)

• 680R....................................R3,4............... 2
• 1K........................................R9................. 1
• 4K7......................................R1,2............... 2
• 10K......................................R5,6,7,8,10..... 5

Capacitors

• 100nF
• monobloc .................C3............................ 1
• 10uF 25V electrolytic..........C1,2................. 2

Semiconductors

• 1N4004................................D1................ 1
• BC557, PNP transistor ........Q1.................. 1
• 74LS05................................IC1 .............. 1
• Hex Inverter with Open-Collector outputs
• 78L05..................................IC2 ............. 1
• 5V regulator, TO-92
• LED, 5mm, Red ..................L1................. 1
• LED, 5mm, Green...............L2.................. 1

Miscellaneous

• D25 connector, male ...........X1................ 1
• Right Angle, PCB mounting
• 2.5mm DC jack ...................X2............... 1
• 16-pin IC socket ..................for SKT ....... 1
• 14-pin IC socket ..................for IC1......... 1

PCB,

• K151...................................................... 1 

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Dual Hi/Lo Switched Relay Board - DIY

Dual Hi/Lo Switched Relay Board - DIY Two 12v PCB-mounted relays based around a ULN2003A high-voltage, high current relay driver. TTL compatible so the inputs can be connected to 5v. Lo 0-0.8vdc Hi 2.4-12v. A Hi or Lo to inputs will activate the relay.

$16.50

Bi-Polar Stepper Motor Driver - DIY

Bi-Polar Stepper Motor Driver - DIY This kit will drive bi-polar stepper motors using externally supplied 5v levels for stepping and direction. This comes from software running on a PC. Uses IRFZ44 and MTP2955 MOSFETs.

$29.88

Bi-Directional DC Motor Speed Controller - DIY

Bi-Directional DC Motor Speed Controller - DIY This kit allows controlling the speed of a DC motor in both forward and reverse direction. The range of control is from fully OFF to fully ON in both directions. Uses MOSFETs IRF4905 and IRFZ44. Max voltage to run kit and motor is 32VDC.

$29.88

UniPolar Stepper Motor Driver - DIY

UniPolar Stepper Motor Driver - DIY Standard circuit to drive unipolar stepper motors with 5, 6, or 8 wires. Uses 4 IRFZ44s. Can be operated in free-standing or PC-controlled mode. Uses standard ICs: 4013, 4030, and 4093. Separate power supply to ICs.

$24.95

Rolling Code 4-Channel UHF Remote Control Kit - DIY

Rolling Code 4-Channel UHF Remote Control Kit - DIY This is one very clever remote control. With rolling code, it's close-toimpossible to electronically crack With four channels, all either latching or momentary operation, it's extremely versatile. With a sensitive prebuilt receiver, it's long range. With up-to-16 keyring-size transmitters, it's go-anywhere. And the kit even includes the keyring!

Parts List :

• 4-Channel Code-Hopping Remote Control
• 1 TX-4312RSA 4-channel keyring rolling code transmitter assembly
• 1 RX3302D A1.5 433MHz rolling code receiver module
• 1 PC board, coded K180, 86 x 78mm
• 4 miniature relays, SPDT, PCB mounting,
• 12V coils (Millionspot H5000xx)
• 1 ultramini pushbutton switch, PC mounting, N-O contacts
• 6 interlocking 2-way terminal blocks, PC mounting
• 2 14-pin DIL IC sockets (optional)
• 4 3-way header pin sets, PC mounting Red & black insulated hookup wire for power connection
• 1 200mm length insulated hookup wire for antenna (see text)
• Semiconductors
• 2 4013 dual D flipflops (IC1, IC2)
• 4 NPN general purpose transistors (C8050 or similar) (Q1-Q4)
• 1 7805 3-terminal regulator (REG1)
• 4 1A power diodes, 1N4004 or similar (D1-D4)
• 4 red LEDS, 5mm (LED1-LED4)
• 1 green LED, 5mm (LED 5)
• Capacitors
• 2 100╡F, 16VW PC mounting electrolytics
• 7 0.1╡F polyester or ceramic (monolithic 5mm)
• Resistors
• 4 10MΩ
• 1 1MΩ
• 4 4.7kΩ
• 4 2.2kΩ
• 1 1kΩ

sales@twinind.com for availability