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High Speed NiCd Charger for Electric R/C - A few years back, I
published a design for a Low Cost Thermal Peak Detection Charger. Since
then, I've designed several other chargers, in my ongoing quest to avoid
having to spend money. Of course, in building all these designs, I've
probably spent more than a really good commercial charger would have cost
me. But designing and building is half the fun....[Stefan Vorketter] |
High-Rate Electronic Speed Control with BEC and Brake - This
electronic speed control (ESC) for brushed motors combines the features of
two of my earlier designs. One was a high-rate 30A ESC with a brake, and the
other a high-rate 12A ESC with a BEC (receiver battery eliminator circuit)…
[Stefan Vorketter] |
High-Rate Speed Control with Brake - Many designs for high-rate
speed controls have been published. Most require two 8-pin integrated
circuits (ICs) or one 14-pin IC. Many designs suitable for home construction
are fairly large (some as large as 2" square)…. [Stefan Vorketter] |
Hot Wire Foam Cutter #1 - Foam cutting is a relatively simple
process once you have the required tools and an acquired level of
experience. So once you are set up, don't be....(added 2/06) |
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Hot Wire Foam Cutter #2 - After seeing other modelers building their model
wings from plastic foam, I decided that I wanted to do the same. Building your wings
from foam covered with 1/16 in. balsa can produce a strong and light wing that could
be difficult to duplicate with the standard balsa rib construction, specially if the
wing had a duel tapered,....(added 2/06) |
Hot Wire Foam Cutter #3 - Here is a homebuilt foam turning lathe!!This is
made from a window motor adapted and appropriately painted for the application. The
pillow blocks that the rotating shaft bear in were made from foam patterns and cast
using the above mentioned techniques. The two dials on the electrical box are light
dimmers with simple....(added 2/06) |
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Hot Wire Foam Cutter #5 - Hot wire foam cutters are a must when working with
polystyrene foam because they make neat, straight and smooth cuts that simply cannot
be duplicated with any other type of saw. Most cutters are hand-held devices looking
much like a cheese cutter without the roller and operate a bit like a jig saw. The
foam cutter described....(added 2/06) |
Hot Wire Foam Cutter #6 - Hot wire foam cutters are used by hobbyists of all
stripes to contour Styrofoam into a vast array of shapes for a wide variety of uses.
Model railroad builders shape foam into landscapes. RC plane builders shape foam into
aircraft wings and fuselages. Stagehands shape foam for theatrical sets and....(added
2/06) |
Hot Wire Foam Cutter #7 - The power supply I used is a little more involved
than what is required but it works well and I had the pieces. I used a PWM (Pulse
Width Modulator) to control the heat to the wire. This is a simple electronic
control that essentially turns the power to the wire on and off very fast and you can
control....(added 2/06) |
Hot Wire Foam Cutter #8 - I am starting a new project that requires almost
all foam work. [Tony van Roon's circuit] |
Hot Wire Foam Cutter (Al Schoepp) - (electronic schematic / circuit added
08/09) |
Hot Wire Foam Cutter (Charles Wenzel) - (schematic / circuit added 08/09)
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Hot Wire Foam Cutter (Daniel Hartman) - (electronic schematic / circuit
added 08/09) |
Hot Wire Foam Cutter (JoeBoy) - (schematic / circuit added 08/09)
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Hot Wire Foam Cutter (Rocket Team Vatsaas) - (circuit / schematic design
added 08/09) |
Hot Wire Foam Cutter (Steven Mohr) - (electronic schematic / circuit added
08/09) |
Hot Wire Foam Cutter (The Hermit MachineShop) - (schematic / circuit added
08/09) |
Hot Wire Foam Cutter (Tom Weedom) - (circuit / schematic design added 08/09)
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HotChek-Brent's website - (electronic schematic / circuit added 08/09)
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Hot-Wire Foam Cutter - Transformer T1 rectifies the 18 to 22 Volts AC via
the bridge rectifier (BR1) to about 26 or 32 Volts DC. T1 is a regular type without
"CT" or center-tap. If your transformer is above 22VAC, you need to modify the circuit
to protect the LM350K from over-voltage (33V max). Check the datasheet for more
info.…. [written by Tony van Roon] |
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