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H Bridge Motor Control Circuits - This page features H-Bridge circuits used for
controlling direct current motors. Several designs are shown using both CMOS and
Bi-Polar power devices….(added 04/05/06) |
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H-Bridge Direct Current Motor Control Circuits - (electronic circuit added 4/05) |
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H-Bridge information - This page features H-Bridge circuits used for controlling
direct current motors. Several designs are shown…..(electronic design added 02/03/04) |
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High Current Crossing Light Flasher LM556 - (electronic circuit added 4/05) |
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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, ….(schematic
added 11/06) |
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HO Train Model Lighthouse Flasher - HO train sets often have authentic looking
scale model homes and buildings. The hobby circuit below can be mounted inside a
model lighthouse. The electronic circuit drives a single LED lamp in such a way that
it produces light which simulates the rotating light from a lighthouse beacon. It
uses a dual low power op amp IC. ….(designed by David A. Johnson) |
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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 .... (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, symmetrical airfoil. The standard ... (added 2/06) |
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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 numerical ... (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 .... (added 2/06) |
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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) |
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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) |
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Hot Wire Foam Cutter #8 - I am starting a new project that requires almost all
foam work. |
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Hot Wire Foam Cutter (Al Schoepp) - (electronic schematic / circuit added 08/09) |
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Hot Wire Foam Cutter (Charles Wenzel) - (schematic / circuit added 08/09) |
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Hot Wire Foam Cutter (D.J.Kammo (pterodactylus)) - (circuit / schematic design
added 08/09) |
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Hot Wire Foam Cutter (Daniel Hartman) - (electronic schematic / circuit added
08/09) |
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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) |
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Hot Wire Foam Cutter (Steven Mohr) - (electronic schematic / circuit added 08/09) |
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Hot Wire Foam Cutter (The Hermit MachineShop) - (schematic / circuit added 08/09) |
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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 (Tony van Roon) - (electronic design / schematic added 2/06) |
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Incline Railway Control Circuit - (electronic circuit added 4/05) |
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Infra Red Switch (Andy Collinson) - This is a single channel (on / off) universal
switch that may be used with any Infra Red remote control using 36-38kHz. (This is a
very common remote handset frequency). In place of IR1 a TSOP1738 receiver may be
used. (electronic circuit added 7/03) |
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Infrared Toy Car Motor Controller - (electronic circuit added 4/05) |
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Infrared Transmitter for Locomotives -
(electronic circuit added 4/05) |
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IR Proximity Detector Information - The circuits on this page are for an Infrared,
Proximity Detector using the Vishay Electronics, TSOP4830 "IR Receiver Modules for
Remote Control Systems".(circuit design added 04/05/06) |
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Joy Stick Controlled Throttle information - This version was specifically design
to be used by a handicapped person and is controlled by a single axis joy stick that
operates microswitches at each end of its arc of travel….(08/08/08) |
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Joy Stick Controlled Modernized Toy Throttle - (electronic circuit added 4/05) |
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Laser Pointer Train Detector - This train detector makes use of hand held laser
pointer devices that are widely available to detect trains over long
distances.(electronic circuit added 7/03) |
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LED Bargraph Optical Tachometer - For the electric R/C enthusiast, a tachometer
can be a very useful piece of equipment. When I first built this tach back in 1995, it
was essential, as there were very few off-the-shelf electric R/C power systems that
just worked….(circuit added 11/06) |
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LED Traffic Lights - The LED traffic Light circuit controls 6 LEDs (red, yellow
and green) for both north/south directions and east/west directions. The timing
sequence is generated using a CMOS 4017 decade counter and a 555 timer. Counter
outputs 1 through 4 are wire ORed using 4 diodes so that the (Red, North/South) and
(Green, East/West) LEDs will be on during(electronic circuit added 4/05) |
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LED-Current Limiting Resistor Calculator - The calculators on this page can be
used to find current limiting resistors and currents for Light Emitting Diodes.
(04/05/07 |
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LEGO® RCX Brick Rechargeable Battery Tester - The ciruit on this page is for a
rechargeable battery tester using a LEGO® RCX Brick to gather voltage verses time data
and then upload the data to a PC using the ROBOLAB Software….(added 05/05/05) |
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LEGO® RCX Brick Voltage Recorder - The images shown on this page show circuits
that can used to measure and record with a LEGO® RCX Brick that comes with the LEGO®
MINDSTORMS and LEGO® ROBOLAB robotics sets…(added 05/05/05) |
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Level Crossing Lights - Every model railway has a place where road and rail meet,
and when it does, some form of warning is needed. Flashing lights work well, but
something is needed to drive them. And that is where this circuit comes in. All it
does is flash lights and it is so simple anyone could build it!...(design added 10/06) |
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LM3909 replacement information - This page features a replacement circuit for the
LM3909 LED Flasher / Oscillator. The replacement circuit uses discrete components and
is essentially the same as the internal circuit of the LM3909….(electronic design
added 02/03/04) |
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LM555 Timer information - Also on this page are calculators that will give the
output times of LM555 timers for a given set of component values. (electronic diagram
added 06/07/08) |
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Low Cost Thermal Peak Detection Charger - The electric model aircraft and car
industries have produced a bewildering array of field chargers for NiCd motor battery
packs. These range from simple 6 or 7 cell chargers consisting of a resistor and
mechanical timer, to more complex chargers with peak detection, cycling, and the
ability to handle 36 cell packs.... (diagram added 11/06) |
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Low Power Crossing Light Flashers LM556 E+F - (electronic circuit added 4/05) |
