cheap encoders

[balsaman]

http://cgi.ebay.com/ws/eBayISAPI.dll...category=42899

http://cgi.ebay.com/ws/eBayISAPI.dll...category=42899

http://cgi.ebay.com/ws/eBayISAPI.dll...category=42899

Not sure but looks to me like they may be 360 cpr, 5 v. nice for geckos. $2.00 each right now.

Eric

[Al_The_Man]

Eric, I know at $2.00 you are not risking much, but I have given up buying used encoders on ebay, more duds than good.
Unless the seller guarantees they are working.
Al

[balsaman]

I just noticed he want's $9.00 shipping each...

Eric

[ger21]

I found some specs for these. Are these any good, because I probably live a few minutes away from this guy and could probably save on the shipping.

"Data Technology's RS23 Instrument Quality encoder is specified where high volume and cost is a prime concern. Along with precision surface mount technology, the RS23 also includes VMOS and CMOS circuitry which gives the encoder superior isolation between the ouput leads and the Internal circuitry of the encoder.
The RS23 encoder is now available with differential line driver options with terminal connections."


MECHANICAL SPECIFICATIONS
Front End: All metal shaft and bearing housing - Face and servo mount standard
Cover: Anodized aluminum
Operating Shaft: Lower of 3000 RPM or 200 kHz max., Slew Speed 6000 RPM
Shaft Loading Max: Axial 10 lbs. (4.54 Kg), Radial 10 lbs.(4.54 Kg)
Shaft Rotation: Bi-directional and continuous
Bearings: Sealed Instrument Quality
Starting Torque: 0.05 oz-in (36 gm-cm)
Moment of Inertia: 3.0 gm cm²
Weight: 6 ounces

ELECTRICAL SPECIFICATIONS
Encoder Type: Incremental Optical Solid State
Resolution: 1-2500 CPR (cycles per revolution)
Power Input: +5 VDC +/-10% 80ma
+12 VDC +/-10% 80 ma
+15 VDC +/-10% 80 ma
Phase Relationship: A leads B by 90 degrees +/-18 degrees electrical
Frequency Responce: 200 kHz or 3000 RPM, whichever occurs first
Drive Capability: TTL and CMOS compatible
Illumination Source: Single Infrared Emitting Diode (IRLED) Gallium Aluminum Arsenide (GaAIAs) hermetically sealed
Output Channels: Dual (A quad B) squarewaves with zero marker pulse (1/4 cycle gated) 1/2 cycle or ungated available
Output Mode: 5V, Power MOSFET (Standard) 8100% differential line driver (-03 option); 12V & 15V, Power MOSFET (standard), MM88C30 differential line driver (-03 option)
Symmetry: 180 degrees +/-9 degrees
Accuracy:
* Pulse to Adjacent Pulse: +/-6 arc seconds
* Pulse to Any Other Pulse: +/-3 arc minutes

[balsaman]

They should work. Are they 360 cpr? You will need to feed them with a seperate 5V supply since they are over 50ma. (as I do with mine)

Eric

[snokid]

just check with the guy first before thinking you can just pick them up and save on the shipping, alot of people won't let you do it, it's their way to make sure that they make what they paid for the item and the listing price is just profit.

Bob

[ger21]

Yeah, I've seen that before. Thanks, though.

Gerry