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Step On It
Perfect for hands-on hobbyists. Foot-pedal speed controls free up your paws to do the real work. This one's for 120VAC devices, and ideal for machines using approx 200W or less. Measures 5" x 3" x 2-1/4" tall, with a 6-foot cord that plugs into the wall and a grounded female plug for your sewing machine, rotary tool, scroll saw, or, if you really make a lot of banana Daiquiris, blender.
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93239 FOOT PEDAL |
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Peltier Heat Pump
High tech comes to Am Sci & Surp!! It is here in the form of a Peltier junction, a thermo-electric device that translates electric power into heat, and perversely, into cool. Apply current @ 3-12 VDC to the gizmo and it extracts thermal energy from one face, thereby cooling it. The heat is dumped onto the other face, thereby heating it. Please note: you must use a heat sink on the hot side or the junction will fry itself, since it can quickly create a 65° C temperature differential in a no load situation. Stack two, or build a cascade to increase the thermal differential created. Or run it backwards. Apply heat or cold to the relevant face and produce a current. Amazing for science projects and experiments. Practical for coffee warmers, beer coolers and mini-refrigerator or warming oven applications. Comes with instructions. Large is 1-9/16" sq. x 3/16" thick.
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89143 LARGER PELTIER JUNCTION |
Wrap Around Heating Element
Resistive element insulated and wrapped in soft, flexible (fiberglass) jacket. The wrapped section is about 27 inches long and about 3/16" in diameter. Each end has a 4 inch insulated lead, but one end is a single strand solid wire and the other is a seven strand braid. We haven't any idea where the marriage takes place! Anyway, they're rated at 90 watts. Plug 'em into 110 VAC and the thing heats up to the point that it's quite hot to the touch - too hot to hold onto. Wrap it around whatever it is that you need to keep warm and make your own heating systems. Make yourself a coil and you can probably keep your coffee pot hot. Or operate it at 12 volts as a telescope dew chaser. You'll notice some smoke when you plug it in the first time, but this won't happen once it's burned in. Happy heating by Hot Watt. Melanie, Tory, and Donna all want one!
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1490 HEATING ROPE |
MiniMultiMeter
Our pocket-sized multimeter measures a tiny 3-5/8" x 1-3/4" x 1" thick, with a 3-1/2 digit display on a 1-1/4" x 9/16" LCD screen. Will measure up to 500VAC, 100VDC, current from 200uA up to 10A, resistance up to 2000K ohms, and will also test diodes and transistors. Comes with (2) 24" test leads and a battery to power it. Teeny price to match its size. Great for science fair projects.
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93148 MULTIMETER |
Digital Multimeter
3-1/2 digit LCD electrical multimeter with a max reading of 1999. Measures (5) ranges of DC, (2) ranges of AC voltage both to 500 V, (5) ranges of resistance to 200K ohms, DC current to 10 Amp., diode test, transistor and battery test. A pocket sized 2-7/8" x 5-3/4" x 1-1/2", it comes complete with test leads and 9 volt battery. The best value for this size we have seen.
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89416 DIGITAL MULTIMETER |
Rotary Solenoid
Means "pipe-shaped," by the way, does "solenoid." (The French made it up, from the Greek. Just thought you might be curious.) This version is small, measuring 1-1/8" dia x 3/8" thick, with a flattened shaft. The shaft rotates approx 20 degrees ccw. Draws 250mA at 24VDC (fires at 18 VDC). Two mounting bolts, 5/16" long x 1/16" - 48, are alongside the shaft, and it has (2) 5" leads and a 2-pin Molex connector.
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36430 ROTARY SOLENOID |
Decibel Meter
'Tain't a toy, McGee. And 'tain't surplus. This digital dB meter from Sper Scientific is pocket-sized--8" x 1-5/8" x 7/8"--and measures sound levels from 32 to130 dB with a built-in 1/2" microphone using (2) "AAA" batteries (included). The resolution is 0.1 dB and it's accurate to within 1.5 dB. Has a built-in calibration oscillator and comes with a foam windscreen and small screwdriver for calibrating. It's very easy to use, with one-button operation on what the manufacturer calls the smallest, lightest dB meter on the market--to help you stay a step ahead of OSHA.
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92622 SOUND LEVEL PEN |
Portable Oscilloscope
The Velleman HPS10 Personal Scope isn't some graphical multimeter -- it's the complete, portable, affordable oscilloscope you've been waiting for! The 10MHz oscilloscope has an analog bandwidth of up to 2mhz. It has 5mV to 20V/div sensitivity in 12 steps, and a 200ns to 1 hour/div time base in 32 steps, full automatic setup, and 5 different trigger modes. It measures dBm, dBV, DC and rms, has signal markers for Volt and Time, and 2 memories to store signals. It has an X and Y position shift signal, DVM readout with x10 option, and audio power calculation (rms and peak). Easy to use and, with a high-contrast LCD display (128 x 64 pixels), easy to read. Accurate enough for professional use on automotive and audio equipment, digital signals and various types of sensors, but priced low enough for educational and hobby applications. Requires (5) "AA" batteries or a 9V adapter (not included).
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92223 OSCILLOSCOPE |
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High Power Relay
A big guy. This chassis-mounted relay is rated for 30A at 300VAC, 15A at 600VAC, 25A at 28VDC, 1 hp at 120VAC, and 2 hp at 240VAC. Coil will draw approx 40mA at 120VAC, and needs at least 80VAC to engage the (2) sets of SPST contacts. Measures 2" x 1-3/8" x 1-1/2" with 1/4" Q/D terminals on the bottom and a 1/8"-32 mounting hole and a mounting tab on one side. Deltrol part number 23063-70
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37860 BIG RELAY |
Pulsations Made Easy
with this small pull-type solenoid. Draws 600mA at 12VDC. Measures 1-1/8" long x 3/4" x 7/8" with (2) quick-disconnect terminals at the bottom back of the coil. The plunger is 5/16" dia counting the U-bracket at the end. When not energized the relay has a 2.24 lb holding force and when energized approx. a 10-lb pull, strong for its size, but rated for pulse duty. Made in the USA.
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36987 PULSE SOLENOID |
A Lot of Pull
Here's a nice, strong pull-type solenoid that draws approx 1/2A at 24VDC, with an estimated strength of 40-50lbs. Rated for continuous duty. Coil housing measures 2-1/8" tall x 1-5/8" x 1-3/8" with a plunger that's 3-1/4" long x 1/2" dia with a 1/2" slot and 1/8" bores. Coil is not polarized. Made in the USA by Guardian Electric.
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37434 SOLENOID |
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