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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 |
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 |
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 |
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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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 |
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 |
Count 'Em Up...
as they go past, with a classic chrome palm counter. 1-3/4" dia x 1-3/16" thick, our mechanical 4-digit counter has a thumb plunger and ring to fit around a finger so you don't drop it, you klutz. The numbers are 3/16" tall, and there's a rotary reset for when you have to start over.
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92897 MECHANICAL COUNTER |
Box-O-Electrodes
Think carbon arc experiments, or electrochemical and electrolytic experiments. Our each is a box of approx (50) 1-1/2" x 3/16" dia carbon electrodes. One end of each electrode has a 1/16" groove 3/16" from the end, with a 1/8" ID opening above it. Made in the USA.
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38804 ELECTRODES |
Variable Vacation Timer
Want to give your house that burglar-foiling random lighting pattern? Intermatic's Time All" solid state security timer has dial settings from 30 minutes to 23-1/2 hours and includes a variable setting of +/- 15 minutes. Two different on/off cycles, 1750 watts max, non-grounded plug, and an override thumbwheel switch. Measures 3-1/16" x 3" x 1-7/8" thick, with a convenient side outlet so you don't have to sacrifice the obstructed second outlet on the wall. UL/CSA.
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39232 VACATION TIMER |
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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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 |
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