Big Blue Button Tact Switch, 12mm x 12mm spacing, PCB solder-in or BreadBoard push-in - package of three(3) switches

4-by-4 Digital Matrix Keypad

• A detailed diagram is available is available here .
• Arduino Library and Tutorial for Matrix keypads is available.

Mini Digital Voltmeter, This is not an incredibly accurate meter, with resolution of 0.1 V, but it's an inexpensive way to quickly see the battery voltage on your Robot or RaceCar or your Motor Vehicle battery. It is easy to use: The meter has a 2 contact JST female receptacle and it comes with a male JST wired with 3-4" red and black pigtails.

• Mounting Hole size: 45.5mm * 26.5mm
• Dimensions: 48mm * 29mm * 21mm
• Range: DC4.0-30V
• Display: three 0.56 LED display
• Refresh rate: about 500ms
• Measurement accuracy: 1% (+ / - 1 count)
• Supply voltage: DC4.0-30V (Same as measured voltage)
• Connections: Ground / Common: Black, + 4.5 to 30 VDC Power: Red

RED

BLUE

GREEN

Complete 8870-based DTMF Decoder Chip Kit - Includes all parts needed to add a DTMF decode to a micro:   either a Zarlink MT8870D chip or Clare M8870-01 in PDIP-18 package, color burst crystal, DIP socket, three precision resistors and 2 caps

This is a hard to find item in small quantities. No bulk sales. Limit three per customer per order.

• Kit Info and Parts List
• ZarLink Data Sheet
• Clare Data Sheet

 100+ 
 42 remaining

 68 
 50 remaining

LM4889 Audio Amplifier, The Modern Device LM4889 audio amplifier breakout board uses one of National Semiconductor's "Boomer" amps. It uses what in the industry is referred to as a "bridge-tied load". This is an efficient system that increases the total amount of power available to the speaker. It also eliminates the need for an output capacitor, (like in the LM386) which tends to be bulky and can limit the low-end response. It has a shutdown pin to put the chip to sleep, just in case you're trying to build a super low-power microcontroller application that spends most of its time sleeping.

This is probably not loud enough for a good dorm-room dance party but more than loud enough for a personal appliance.

Reference

• With Vcc = 5V and 8 ohm speaker
  • .4 watts out has 1% THD
  • 1 watt out has 2% THD
• Modern Device Audio Amplifier Schematic(png)
• Ships with a two pin, and a 4 pin male header, and a 200K pot which are all not soldered onto the board. All other parts are assembled and tested and ready to go.
• The Audio Amp Schematic is available.
• The LM4889 Data Sheet is available.

Experimenter's Pack

An assortment of items to get you started.

• 20 each of 5 useful values of 1/8 watt 5% carbon film resistors ( 10K, 4.7K, 1K, 330, and 100 ohms )
• 8 1/4 watt 1% precision carbon film resistors for analog voltage scaling. The following values supplied produce these scales to 0-5 volts
  • 10K/10K for 0-10 volts
  • 10K/4.53K for 0 to 16.03 volts
  • 10K/4.53K for 0 to 16.03 volts
  • 22.6K/4.53K for 0 to 29.94 volts
• 4 pushbutton switches
• 2 each Red, Green, Yellow LEDs
• a DS18B20 One-Wire(tm) temperature sensor
• 2 three wire 14" cables and pin headers
• a piezo sounder
• two 10K potentiometers
• a battery harness and a power connector terminal block
• 5 small signal diodes (1N4148/1N914)
• 2 power diodes 1N4001
• 2 each 2N3904, 2N3906, TIP41C transistors
• Cadmium Sulfide light dependent resistor (4-8K in light, 200K in dark)
• 8 0.1 uF capacitors ("104")
• 4 47 UF electrolytic capacitors
• 2 LM7805 voltage regulators

HTX-900 micro Servo - from HVW Technology.

• Size : 21x12x22 mm / 0.74x0.42x0.78 in
• Voltage : 3v ~ 6v
• Weight: 9g / 0.32oz
• Speed : 0.12 sec/60(4.8V)
• Torque : 1.6 kg-cm
• Working Temp : -30C~60C
• Teflon Bushing, 15cm wire, coreless motor
• Servo arms & screw included
• Physical Dimensions

Qty=1

Qty=3

All done ordering? To start check out select shipping method

Breadboard Potentiometers, top quality, standard .100" pin spacing. Packages of four (4).

• The Data Sheet is available.

1 KOhm

10 KOhm

MiniBreadboard, top quality, standard .100" spacing, 17 rows of 5 hole and 5 holes, 170 total contact points, size is 1.8" L by 1.35" W, peel off adhesive on base.

Qty=1

Qty=3

Single Panel Breadboard, top quality, standard .100" spacing, 830 total contact points, two terminal buss strips, size is 6.5" L by 2.125" W

Qty=1

Qty=3

Breadboard Power Supply - by HVW Technology. 6-9 volt input, 5 volt output @ 500 ma. More current if you heatsink the 7805 VR. Fits standard solderless breadboard power rails. Output polarities/pin assignments configurable.

Qty=1

Qty=3

Breadboard Wires - bundle of 75 wires of various lengths with male pins on each end

Qty=1

Qty=3

9 vdc/300 ma AC Power Supply - this a like-new "pull" from never used equipment. It was designed to be plugged in 24/7. Has standard 18 ga wire with standard coaxial connector. (Radio Shack Type "M" - 2.1 x 5.5 mm) May be used with the BreadBoard Power Supply above.

Qty=1

Qty=3