It limits the spike amplitude to about ,6 volts above the power supply positive rail. Step 1: Explanation. This a 3 Light type model railroad block signal circuit that can produce solid - Red, Yellow and Green signal aspects. This page is for an automatic direction reversing circuit that will control the point to point operation of a "shuttle" such as an RDC car or a short train.

Also, I have several 5k one watt pots and was wondering if I could change the voltage divider of R6,R7 and R8 to accommodate a 5K pot.Tom, The pot value is needed to provide full 0% to 100% control. Switch S2, a DPDT slide switch, is wired to provide the Forward/Reverse polarity function. These documents will provide more detailed explanations and schematics for the circuits. Also, the larger value greatly reduces the current used by the divider reference circuit.
I have contemplated building a circuit that uses 20kHz PWM to remove the high pitch motor winding noise. Is it a 1N4004?

Send me your e-mail address if you would like the Gerbers.Hi, very interesting circuit, a question … no protection against short circuits?

The second brake step then stops the train just quickly enough to allow the first or second coach to stop in front of the station. U1B+ is connected to the wiper on potentiometer R7.Whenever the oscillator ramp voltage is lower than the wiper reference voltage, the output of U1B goes high and whenever the oscillator ramp voltage is higher than the wiper reference voltage, the output of U1B is low. This circuit is a power supply for single and twin coil, solenoid type switch machines. The booster's designed output rating is 3 amps at 15 volts. The circuit can also turn the signal OFF for approach lighting if desired.

The circuit on this page is for a visible and infrared light detector circuit board that has 4 detectors.

The available signal indications are; SOLID - RED, YELLOW, GREEN, and FLASHING - RED, YELLOW and GREEN.

Following this section is a list of the circuits that appear on these pages. at 30% or more duty cycle, the motor noise is only like a motor on a DC supply. Model trains are fun toys which every one of us used to play with in our childhood. Three versions of this throttle are shown on this page. The booster's designed output rating is 3 amps at 15 volts. The output section of the circuit takes its power from an external power supply and uses a LM555 timer to provide the release time delay and both an Open Collector and Bipolar output each detector.
In these circuits a transformer is used to isolate the detector circuitry from the track power circuit. References to registered trademarks within this page are provided for informational use only, and are not intended as an endorsement for any service or product. Welcome to a page of electronic circuits that are mostly for model railroads. The circuits on this page are basic designs for "Diode Matrix" switch machine control systems that can be used to operate "Stall-Motor" switch machines in 'Ladder' type storage yards or other multiple turnout areas. The circuits on this page are for an Infrared - Proximity Detector using the   The circuit shown on this page allows inexpensive digital multimeters to measure currents in DCC systems. Here is a way to use old wire coat hangers to make simple and efficient wiring harness guides that can help keep your layout wiring neat and tangle free. In this remote controlled switch circuit we are using TV remote to ON/OFF the AC light by pressing any button of remote, and using the TSOP1738 at receiver end. Both designs use MOSFET isolation devices. Place the IC on a breadboard. They are designed to drive Light Emitting Diodes but could be used to drive low current incandescent lamps. Control in that field than the Track circuit. The circuits on this page are switch machine drivers that can be used to operate Stall-Motor type switch machine motors. Not only is the cost of nationwide PTC installation expected to be as much as While the FRA Rail Safety Advisory Committee identified several thousand "PPAs" (PTC preventable accidents) on US railroads over a 12-year period, cost analysis determined that the accumulated savings to be realized from all of the accidents was not sufficient to cover the cost of PTC across the The reason behind the lack of economic justification is that the majority of accidents are minor and FRA crash worthiness standards help mitigate the potential loss of life or release of hazardous chemicals.


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