AC in Incandescent Bulb Flasher For Crossings

Great idea! I think I would be interested if they became available

Michael,

Fantastic!

I've also been searching and testing solutions for a sound to be included in the module as well. We will see how that goes.

Is this similar to Lionel's part No. 610-2760-300 PCB which was  installed into the base of the No. 6-12760 highway flasher?  I purchased a few of these and wired them in directly below my 154's.

@GregR posted:

Is this similar to Lionel's part No. 610-2760-300 PCB which was  installed into the base of the No. 6-12760 highway flasher?  I purchased a few of these and wired them in directly below my 154's.

Greg,

This is functionally the same.  Lionel chose to take a different route on design and it allows the mounting underneath to be possible.

You would probably need to wire mine under the layout, but functionally, they do the same thing.

It should be pretty easy to build these to fit inside the base of the signals I would imagine.

I would be interested, especially if they could fit under the base of the postwar American Flyer crossing signal.

My thinking is that $20 each might be a bit high, though.

Here's a design I have saved, this would probably be pretty easy to knock out a PCB for.

Lionel made 2 circuit boards that fit into the base of the signal. The left flashes LED's the right, bulbs.

@gunrunnerjohn posted:

Here's a design I have saved, this would probably be pretty easy to knock out a PCB for.

GRJ circuit is about as simple as it gets, though I suppose someone will chime in with "But wait, I can do this with a (name microchip) and 5 lines of code and a wall wart."

Ok, I'm really cheap. Here's what I cobbled together under my layout. I have 14VAC coming out of my 153IR. One set of leads goes to the 610-2760-300 PCB which is taped to the underside of my layout. From there, wire go straight to the 154. That gives me my flashing lights.

Next is sound. Tapping into the same 14VAC coming from the 153IR, I convert it down to something like 5VDC and feed it into a cheap made-in-China sound recording card (pictured below). About $3 with free shipping on Ebay. I recorded a real grade crossing sound onto the board and set it in "loop" mode. I taped it to the underside of the layout too. Finally, I connected in a speaker that I salvaged from some old toy. There's my sound.

Results in video below.

@rrman posted:

GRJ circuit is about as simple as it gets, though I suppose someone will chime in with "But wait, I can do this with a (name microchip) and 5 lines of code and a wall wart."

I actually thought about suggesting doing it with a PIC and a couple of FET's, but decided against it.

@GregR posted:

... a cheap made-in-China sound recording card (pictured below). About $3 with free shipping on Ebay. I recorded a real grade crossing sound onto the board and set it in "loop" mode. I taped it to the underside of the layout too. Finally, I connected in a speaker that I salvaged from some old toy. There's my sound.

...

Wow, and that free shipping is apparently from a US seller which probably means you don't have to wait weeks!

BTW, it wasn't clear in your video but when you put it in the "Loop" mode is the looping seamless?  Or do you hear a slight gap or hiccup or whatever when it starts again?  And did you have to experiment making several recordings to get the looping "just right"?

GregR,  I had a hard time hearing the sound and wondered if it was actually much louder to get over the sound of a passing train?  As caveat, I am partially deaf especially at higher frequencies so please excuse if everyone with "20/20" ears hears it perfectly.

As aside somewhat off topic but related, many years ago I had a chance to buy five sound boards and built a unit with four Noma station announcements plus a Marx one (Marx's was interesting sounding...).  I could switch between any one and a button press played that announcement once.  I bring it out when there is an open house and place speaker below the MTH station.   BTW, my favorite Noma announcement is Pennsylvania (maybe because I grew up in Pittsburgh?), played it to death, and can still recite announcement verbatim (and still have station with original mechanism to boot.)

@stan2004 posted:

Wow, and that free shipping is apparently from a US seller which probably means you don't have to wait weeks!

BTW, it wasn't clear in your video but when you put it in the "Loop" mode is the looping seamless?  Or do you hear a slight gap or hiccup or whatever when it starts again?  And did you have to experiment making several recordings to get the looping "just right"?

After a couple of tries, my recording was pretty decent. The loop mode does have a slight hiccup every 20 seconds, but it's barely noticable. By 20 seconds, my train has usually passed the crossing anyway.  Yes,  I could clean up the sound file, but it doesn't bother me. I suppose if I were really troubled by lack of realism, I wouldn't have a 154 signal in the first place since it measures a ridiculous 70'-0" tall in O scale.

@rrman posted:

GregR,  I had a hard time hearing the sound and wondered if it was actually much louder to get over the sound of a passing train?  As caveat, I am partially deaf especially at higher frequencies so please excuse if everyone with "20/20" ears hears it perfectly.

As aside somewhat off topic but related, many years ago I had a chance to buy five sound boards and built a unit with four Noma station announcements plus a Marx one (Marx's was interesting sounding...).  I could switch between any one and a button press played that announcement once.  I bring it out when there is an open house and place speaker below the MTH station.   BTW, my favorite Noma announcement is Pennsylvania (maybe because I grew up in Pittsburgh?), played it to death, and can still recite announcement verbatim (and still have station with original mechanism to boot.)

I am sorry you coudn't hear it in my video, but those bells are as loud as ****, even with trains running. Most of the time, I have the connector unplugged because it just gets too annoying.

I found this OGR thread from 2017 where you were entertaining the idea of using an MP3 module for the sound (and possibly even for flashing light timing).  What is your current thinking on sound?  GregR's comment above suggests some kind of volume control (or I suppose basic on/off) might be a nice touch.  If the crossing is active for a few seconds, then no big deal.  But listening to minutes of clanging if the train is stopped on the crossing would drive anyone batty!

To that end, if you are still considering the MP3 route, instead of a volume control perhaps something as simple as a minutes-long bell sound that starts out loud for 20 seconds or whatever and then slowly fades to a background level.  Then back to full volume on the next activation.

@gunrunnerjohn posted:

I actually thought about suggesting doing it with a PIC and a couple of FET's, but decided against it.

More practically, it could be done with a 555 timer, one resistor and one capacitor, plus the bridge and cap in the power supply. So you could get rid of one capacitor entirely, replace one 1000 uF with a small 10uf or so, and eliminate one resistor.  The output of the 555 is rated 200 mA, just like the 2N3904. The 16V rating of the 555 should not be an issue seeing that we are dealing with 14 volt bulbs anyway. So the flasher proper would go from 6 parts to 3, and smaller parts at that.

Just moving the design from 1968 to 1973.....

@PLCProf posted:

More practically, it could be done with a 555 timer, one resistor and one capacitor, plus the bridge and cap in the power supply. So you could get rid of one capacitor entirely, replace one 1000 uF with a small 10uf or so, and eliminate one resistor.  The output of the 555 is rated 200 mA, just like the 2N3904. The 16V rating of the 555 should not be an issue seeing that we are dealing with 14 volt bulbs anyway. So the flasher proper would go from 6 parts to 3, and smaller parts at that.

Just moving the design from 1968 to 1973.....

Sure, but it wouldn't be nearly as much fun.   Besides, with the FET outputs, I could handle amps.

@gunrunnerjohn posted:

Sure, but it wouldn't be nearly as much fun.   Besides, with the FET outputs, I could handle amps.

Ah yes, a miniature flasher for a 1:1 scale crossing signal.

NOW I understand.

Jumperable variable flash rates?

@Chuck Sartor posted:

Lionel made 2 circuit boards that fit into the base of the signal. The left flashes LED's the right, bulbs.

Chuck, any idea what the p/n's might be? Sale starts tomorrow!

Led flasher = 610-2888-310.

bulb flasher= 610-2760-300

@Chuck Sartor posted:

Led flasher = 610-2888-310.

bulb flasher= 610-2760-300

Thanks!

George

@PLCProf posted:

...

The output of the 555 is rated 200 mA, just like the 2N3904. The 16V rating of the 555 should not be an issue seeing that we are dealing with 14 volt bulbs anyway.

If the 555 output is directly driving the two bulbs, it has a quirky characteristic of providing more power in one half of the cycle.  In other words, given two identical bulbs one might be brighter than the other.  The analysis is somewhat tedious (depends on voltage, bulb power, etc.).  Whether anyone cares or not is open for discussion but this is a known behavior and often rules out the use of the 555 when driving a pair of identical alternating loads.  If the 555 is simply used for timing and the 555 output drives a pair of identical transistors (FETs), then bulbs behave symmetrically.

The issue of the 16V rating is not whether or not the load is a 14V bulb.  It's that in O-gauge the typically accessory voltage is 14V AC.  Put this thru a bridge rectifier and you suddenly have a DC voltage that will smoke a 555.  Plus, many guys use, say, a CW80 for accessory voltage.  These "chopped sinewave" transformers may be set to "only" 10V or 12V AC but the actual DC voltages after a bridge rectifier will also smoke a 555.

Your mileage may vary.

@Chuck Sartor posted:

Led flasher = 610-2888-310.

bulb flasher= 610-2760-300

Are then available from Lionel.  When i looked for the 300, it stated unavailable.

I didn't actually check if they had them in stock. Jeff Kane, Train tender has them if you are looking for that board.

@Chuck Sartor posted:

Led flasher = 610-2888-310.

bulb flasher= 610-2760-300

@Chuck Sartor, may I also ask if you have the wiring connections for the LED board 610-2888-310?

This board comes with a red & black wire soldered to 3RD1 and GND, respectively. I assume the red wire gets connected to the center rail or a fixed voltage terminal, and the black wire is connected to an insulated outer rail or contactor switch. The LEDs I believe are L1 and L2, but does the common LED connection go to the GND solder connection? And what is the purpose of the unused terminal 3RD?

Secondly, I also am assuming that no current limiting resistor needs to be added to each LED? It appears they already exist in the two surface mount resistors labeled 112, or 1.1kohms. Is this correct?

I know it wasn't very expensive, but I still hate to screw up a brand new pcb Thanks!

3rd is the common for both LED's. L1 and L2 are the individual LED. Correct, the current limiting resistor is built in the board.

@Chuck Sartor posted:

3rd is the common for both LED's. L1 and L2 are the individual LED. Correct, the current limiting resistor is built in the board.

Thanks Chuck!

A bit of an update for those still interested.

I made a video about this circuit which includes a schematic and BOM for those who want to give it a go themselves.  It's cheap and has been working very reliably for me the past year.

Here is the video:

Circuit schematic is at 9:40

and circuit BOM is at 13:08

I actually also added sound from an MP3 module and was able to use a cheap Rectifier/Regulator combo to run it.  Wiring this in with the flashing circuit gives it the ability to operate with it.

Let me know if there are any questions and good luck!

I tried to see if it would be viable for me to make and sell these myself, but with costs and what people are willing to spend for this, I am not sure this design is worth it.

Maybe that will be a future project for me, along with making the footprint smaller. 

But for now, this is it!

@Datdupa46_Novotronics posted:

A bit of an update for those still interested.

I made a video about this circuit which includes a schematic and BOM for those who want to give it a go themselves.  It's cheap and has been working very reliably for me the past year.

Any chance of just posting the BOM and schematic so you don't have to extract it from a video?

@gunrunnerjohn posted:

Any chance of just posting the BOM and schematic so you don't have to extract it from a video?

Absolutely

I will do that this afternoon!

Thanks.

Schematic is here:

BOM is here

For grins, I am currently working on a PCBA for this with smaller surface mount components.  I will keep updating here as I go.

If it makes sense, I might start selling PCBs that do this flashing.  But for now, just for fun!

I'm not sure I can follow that complex diagram, can you explain it?

Just kidding...

Thanks for posting, I was curious and hadn't seen the diagram before.

Here's one that's been around forever, uses bigger components but about the same idea.

For the avid DIY'er see the OGR Electrical Reference thread with the repository of various and eclectic circuits including printed-wire circuit boards which will vastly simplify the soldering task, schematics, and BOM's.  Project #5 and #6 by @Rod Stewart are alternating flasher projects, one for LEDs, one for incandescent bulbs.

@stan2004 posted:

For the avid DIY'er see the OGR Electrical Reference thread with the repository of various and eclectic circuits including printed-wire circuit boards which will vastly simplify the soldering task, schematics, and BOM's.  Project #5 and #6 by @Rod Stewart are alternating flasher projects, one for LEDs, one for incandescent bulbs.

Stan,

Thank you for sharing this!

This is fantastic.

@gunrunnerjohn posted:

I'm not sure I can follow that complex diagram, can you explain it?

Just kidding...

Thanks for posting, I was curious and hadn't seen the diagram before.

Here's one that's been around forever, uses bigger components but about the same idea.

John,

Haha, very funny

As for the circuit you posted, yes, this is an Astable Multivibrator design just like mine.  Although it is full-wave rectified, while mine is only half-wave rectified.  The 2N3904 also has different characteristics than the TIP3055 for switching.  But they both accomplish the same task with the same theory.

PCBAs have been ordered, we will see how the process goes.

Curious to see how it turns out.

First time doing one, so judge away