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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 |
Testing, Testing
Something really special: a brand new 30MHz dual-channel Elenco S1325 oscilloscope. Comes with (2) probes. Switchable between X1 and X10. 400V P.P. max. Sensitivity is 1mV/DIV. Dual or single trace operation. Calibrated 20-step timebase with an X10 magnifier. Auto/Norm triggered sweep operation with AC, TV-H, TV-V and line coupling. Fold-down carrying handle. If you need more information, we have a full tech sheet available. Comes with a 39-page operation manual. A great price for this analog oscilloscope.
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92150 OSCILLOSCOPE |
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Be A Meter Reader
And save a bundle. The "Kill-A-Watt" plugs into a wall outlet and accepts the power line for any devices or appliances that draw up to 1875 watts. Identifies energy eaters, tracks efficiency and costs over time, and checks on your electricity provider by monitoring voltage, current (amps), watts, kilowatt hours, frequency (Hz), volt amps, power factor, and elapsed time. Measures 5-1/8" x 2-3/8" x 1-7/16" with a 1-3/4" x 11/16" LCD screen. You may never use a waffle iron again.
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93575 KILL-A-WATT |
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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Clamp On, Clamp Off
Call it the Jaws of Juice, our 600V AC/DC, 600A digital Clamp-On Meter. Functions include amperage, voltage, continuity, resistance and data hold. Resistance measurement to 2000 ohms, 1-1/2" x 3/4" display screen, auto-off for longer battery life. Good for Category I, II, and III apps. Includes 9V battery, test leads, and carrying case. Sells on less-generous on-line sites for $69.95. Made for Greenlee/Textron®. UL.
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39136 CLAMP-ON METER |
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 |
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 |
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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Does This Count?
Does it ever. Our 8-segment LCD digital counter registers up to (99) million, and is powered an internal 3V Panasonic lithium battery. Has count and reset terminals on the bottom, triggered by a short pulse between 5 and 30VDC, with an easy-to-read legend on the back. It's a compact 2-1/16" deep x 1-7/8" wide x 15/16" tall (including clearance for the terminals and a stand-off on the back) and includes an instruction sheet. Made by Redington (part # 7600-731DC) in the USA.
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37806 DIGITAL COUNTER |
Mighty Nice
Need a small solenoid with a big attitude? Our 24-Hour Electro-Mechanical Conversion Testing Department tells us these are both "pretty nice little solenoids." (They talk like that.) Our 24VDC pull-type solenoid draws 8.5A at the start and 4.5A to hold. The coil measures 2-1/8" long x 3/4" dia with a 2-pin connector on the bottom and is mounted on a 3-5/8" long x 3/4" wide slotted mounting bracket. The 3" long spring/plunger has a 1-3/16" throw.
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36133 24 VDC SOLENOID |
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Dial-Free Timer
We live in a digital age, so for the analog-impaired consumer we are now offering the all-digital timer. Turn those lamps and barking-Doberman recordings on and off automatically with this 7-day indoor timer. Has an ungrounded plug and (4) modes: every day, individual days, weekdays only, and weekends only, programmable for up to (7) different on/off cycles for each. Max 750 watts. Round, approx 3" dia x 1-3/8" thick, with a 1-3/8" x 5/8" LCD display. UL/CSA.
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39233 DIGITAL TIMER |
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