My Library - Magazine Articles By John S. Atkinson

Electronics Symposium

Magazine:
Model Railroader 1995-11
Page:
120
Category:
Electronics
Description:
This column covers using the HT2014 LED flasher integrated circuit by Holtek, using a hall-effect sensor for turntable indexing, using an LM339 as a photocell detector, and a circuit design for automatically slowing an engine when it reaches the end of a spur.

Electronics Symposium

Magazine:
Model Railroader 1996-08
Page:
108
Category:
Electronics
Description:
This month's column covers how to make a three-position semaphore control circuit, a how-to on using high-power AC wiring, and how to build a low-voltage power supply.

Electronics Symposium

Magazine:
Model Railroader 1996-11
Page:
130
Category:
Electronics
Description:
This column covers building turnout-position indicator circuits, and using filter capacitors with low-voltage power supplies.

Exploring Hall-effect Sensors

Magazine:
Model Railroader 1995-08
Page:
116
Category:
Electronics
Description:
Using rare-earth magnets in engines and cabooses to trigger a hall-effect sensor to activate circuitry. An example given is an automated crossing gate system.

Fun with Photocells

Magazine:
Model Railroader 1995-02
Page:
116
Category:
Electronics
Description:
The author presents several circuit schematics, such as a photocell LED driver, a photocell detector, a hidden fouling point detector, and driving other devices.

Fun with Phototransistors

Magazine:
Model Railroader 1994-08
Page:
102
Category:
Electronics
Description:
How to use phototransistors in model railroading applications.

Symposium on Electronics

Magazine:
Model Railroader 1989-02
Page:
150
Category:
Electronics
Description:
This installment covers a reverse polarity detector, which can be used to indicate reverse polarity situations in a blocked layout, or to drive scale signals.

Symposium on Electronics

Magazine:
Model Railroader 1989-08
Category:
Electronics
Description:
This month's column covers correcting errors in the February's issues' reverse polarity detector, and the traffic light controller circuit.

Symposium on Electronics

Magazine:
Model Railroader 1990-02
Page:
116
Category:
Electronics
Description:
Includes 12-volt lamp driver circuit, a 12-volt traffic light interface, a night flasher, audio amplifier and noise generator, a pseudo-random-sequence generator, and an oscillator circuit.

Symposium on Electronics

Magazine:
Model Railroader 1990-05
Page:
102
Category:
Electronics
Description:
This installment covers building repeater relays for throwing many points in complex tracks like double crossovers with one switch, creating a Mars light flasher, using the random-sequence generator from the February issue of this magazine to drive circuits for a telegraph sound module, a realistic flickering fire module, diesel sound, creating random on/off lights for residential homes, and traffic light synchronization.

Symposium on Electronics

Magazine:
Model Railroader 1991-08
Page:
112
Category:
Electronics
Description:
Using RS-232 connectors to connect wiring between modules. Also discussed is the 555 integrated-circuit and how to use it to build a mechanical refrigerator car sound, a voltage divider, and a reed-switch turn-off delay.

Symposium on Electronics

Magazine:
Model Railroader 1991-11
Page:
136
Category:
Electronics
Description:
This column covers the 741 op-amp. Included design diagrams include both the inverting and non-inverting amp, a follower amp, a summing amp, a difference amp, a decoupling amp, a tone generator, and a tone adder. The last two can be used to simulate diesel engine horns, which are usually the combination of a couple of individual notes.

Symposium on Electronics

Magazine:
Model Railroader 1992-02
Page:
108
Category:
Electronics
Description:
This column covers the LM386 and LM383 audio amplifiers, and the LM317 and LM337 voltage regulators. Also included is a "laboratory" power supply.

Symposium on Electronics

Magazine:
Model Railroader 1992-05
Page:
100
Category:
Electronics
Description:
This month's column covers "snubber diode" (to prevent electronics from being damaged by the switching of a relay), and full discussion of the now-extinct LM3909 integrated-circuit chip that made building LED flasher trivial. There is also a full discussion of how Transistor-Transistor Logic works (TTL). IC codes are explained as well.

Using Sound Chips on Your Layout

Magazine:
Model Railroader 1995-05
Page:
118
Category:
Electronics
Description:
Describes how to use the Radio Shack 276-1325 ISD1000A voice record-and-playback integrated circuit.