Part # for PS2 3V Speed Sensor

Pete,

The part number for the Tach Board is AG-0000058 and MSRP is $7.00.

Thanks Barry. Price is better than I expected.

Pete

We're talking about the gizmo that reads the tach tape, aren't we?  There are several version available, for locos with different sized flywheels.  They have different thickness spacers.

Aren't they only 3 terminal?

Here's the part variations for the tach board and the number for the sensor.  Note that the sensor is obsolete, and I don't find sources for them.

Great info again John. Looks like my board is AG-0000041 with the 2.2mm spacer.

Looks like the hunt is on for the bare sensor. rjr the sensor has 4 leads. I suspect two are tied ground, hence three wires.

Pete

Do they come with the wires attached to the sensor? I'd probably fry the thing if not. 

Odd.  Every upgrade I've done had 3.  See the attached from the steam upgrade manual

Gregg, I once unsoldered a sensor to insert a spacer.  NEVER AGAIN!

RJR posted:

Odd.  Every upgrade I've done had 3.  See the attached from the steam upgrade manual

The sensor PCB has three leads, the actual sensor part has four leads.

RJR posted:

Odd.  Every upgrade I've done had 3.  See the attached from the steam upgrade manual

The sensor PCB has three leads, the actual sensor component has four leads.

Understood.  Thanks, John.

3 wires not 4.

This is the item I would like to find but its beginning to look like I will have to order the MTH board. I appreciate the input.

Pete

So everyone is right.  The sensor itself has 4 conductors, but only three conductors connect the board on which it is mounted to the PS2 system.  It's a matter of perspective.

When I was upgrading my older locos, I bought a variety or sensors on boards with varying spacers.

I think I am going to try these. 

http://www.digikey.com/product...3/QRE1113-ND/2175990

It appears the spacer might have to be a bit thicker but the rest of the parameters are pretty close. Always good to have options.

Pete

The tach reader has 3.  Thats what we figured he was talking about.  I Just buy the correct tach reader.  Norton, sorry about the wrong read.  Everyone usually just buys the tach reader.  

RJR posted:

So everyone is right.  The sensor itself has 4 conductors, but only three conductors connect the board on which it is mounted to the PS2 system.  It's a matter of perspective.

 

When I was upgrading my older locos, I bought a variety or sensors on boards with varying spacers.

Not really, he was very clear in asking about the 4 terminal optical device on the sensor, and explained he did not want to order the entire sensor.  G

Norton posted:

I think I am going to try these. 

http://www.digikey.com/product...3/QRE1113-ND/2175990

It appears the spacer might have to be a bit thicker but the rest of the parameters are pretty close. Always good to have options.

 

Pete

Won't work with out re-orientation.  I did try one.  Not worth the effort.  Go look at the pin out between the 2, they are different.

The reason for 4 legs is 2 are 5VDC in, PCB ground for the LED, and output for sensor.   G

gunrunnerjohn posted:

Here's the part variations for the tach board and the number for the sensor.  Note that the sensor is obsolete, and I don't find sources for them.

Tach Reader board (no spacer)	AG-0000033	for Mabuchi motor w/ 30mm flywheel
Tach Reader board (1.5 mm spacer)	AG-0000047	for Mabuchi motor w/ 27mm flywheel
Tach Reader board (2.2 mm spacer)	AG-0000041	for Pr Steam with 30 mm flywheel
Tach Reader board (no spacer w/ resistor)	AG-0000048	for LocoSound board in tender 30mm
Tach Reader board (1.5 mm spacer w/ resistor)	AG-0000054	for LocoSound board in tender 27mm
Tach Reader board (no spacer) with hole in pcb	AG-0000058	for RK L-3 Mabuchi w/ 30mm flywheel
Optical sensor component	AG-0000078	Omron part EE-SY124

AG-33 obsolete replaced by AG-58.

Missing AG-83 .5mm spacing

no spacer comes in diesel, and there is an equivalent SMD device used.

1.5mm spacer comes with Steam kit.  G

G, thanks. It was late and I planned to check the pinout today. Have you found a replacement? I am thinking if the original part is obsolete then it won't be long before MTH is out of stock. 

I could mount the Fairchild one on Vector board and reorient the wires but like you say its hardly worth the effort other than to not have to deal with MTH which is rarely a smooth process for me.

Pete

Pete, contact Chuck Sartor, he may have the part:

http://only3rail.com/

If not I may have the sensor (if you're still looking) but I'd have to check the spacer.  I got 2 from him a while back and used only 1.

Not really, he was very clear in asking about the 4 terminal optical device on the sensor

Your comment added nothing, George.  I was not the only one who sought clarification---see above posts.

Pete, I have them in stock and MTH had the AG-78 also.  I think they and their factory did the last buy out as they went obsolete.  Not really an issue as PS-3 uses a different sensor.  They have continued to produce them in kits and have them as spares, and there is an SMD version used for the non spacer version.

The price difference is minimal, and your time is more valuable.  I do rebuild them, but it is a pain.  Remove old, clear holes, refit new, and solder.  Too much heat and damaged sensor.  SO, for a one time thing why try to save a $1.  MTH price for sensor is $6, whole assembly $7.  While if you can get the component for less it is worth while, in this case you really can't.

You can make the QRE work, but have to mount reversed and solder wires different.  Tried one and it work, but never bought any more.   G

If MTH ever really runs out of these and I need more, I can get about 40 of the PCB boards with the alternate pinout for less than $1/ea, add the alternate sensor and you're off to the races.  This would be a pretty easy thing to do, so I'm not losing sleep over them running out of tach boards.

RJR posted:

Not really, he was very clear in asking about the 4 terminal optical device on the sensor

Your comment added nothing, George.  I was not the only one who sought clarification---see above posts.

Please read his initial post and than ask your self what part of his question you answered....if you want to talk about your comment adding nothing ?  G

Norton posted:

I was wondering if anyone knows the part number of the 4 terminal optical device used in the PS2 3V kit speed sensor? I would order the complete circuit board with sensor from MTH but as a last resort figuring it would be many times the cost of the sensor alone if I knew what they used. The actual MTH part number for the mini board would help also if I have to go that route. TIA

 

Pete

Pete, 

I saw this the other day an I have some speed sensors when I had my shop before I became totally disabled as a Vet. 

OK Digi-Key EE-SY124 , what is interesting it is the same compact sensor TAS used, I stumbled across that. If you still need one let me know. 

The EE-SY124 is obsolete and not available at Digikey or any other popular electronic supply house.