Rotary encoders for 65XX and 66XX power supplies

'scuse my ignorance but where are rotary encoders used in power supplies ? dialling up voltages ? so can replace with something else only functionally the same ?

-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on

On Thu, 25 Sep 2008 10:37:28 -0400, JW put finger to keyboard and composed:

I believe that QRPG = Quadrature (?) Rotary Pulse Generator

Your encoder looks similar to the HRPG series.

HRPG Series Miniature Panel Mount Optical Encoders (H=housed?):

Pinout:

1. Ground (dot on bottom) 2. Channel B 3. Vcc (+5V) 4. Channel A 5. Shield (Housing Ground)

FWIW, the following URL states that the "HP optical encoders (HP QRPG-A475) ... are 32 count per revolution, with quadrature output. Actual Part#: HRPG-AS32#14C".

Mouser carry this part (HRPG-AS32#59C):

Unfortunately the MOQ is 20 units @ $38 each :-(

Here is a Bourns 32PPR optical encoder (US$18, MOQ=1):

Datasheet:

It may be worth noting that the following HP encoder also has a 5-pin connector, but different pinout. Therefore I wouldn't assume that the HRPG and QRPG pinouts are identical.

HEDM-55xx/560x & HEDS-55xx/56xx Quick Assembly Two and Three Channel Optical Encoders:

Pinout:

1. Ground 2. Not connected 3. Channel A 4. Vcc (+5V) 5. Channel B

- Franc Zabkar

Thanks for all your help Franc. I think I'll give that one a try.