Component ID: HP 1826-0775 1DA7Q

On 12 Aug 2009 09:42:50 -0400, snipped-for-privacy@repairfaq.org (Samuel M. Goldwasser) put finger to keyboard and composed:

Could it be a (D)iode (A)rray of 7 diodes???

Does the HP cross-reference include a manufacturer code?

Is the chip powered?

- Franc Zabkar

No manufacturer. Older schematics simply had the HP part number with no equivalent. Newer ones have the funny 1DA7Q code, which looks like an SMT code but this is a 16DIP.

It's an active device, probably at least one op-amp and comparator. Maybe some AGC circuitry.

It runs on +5 VDC. The main input pins are for an AC signal from a photodiode. These may be an op-amp input and output with feedback components external. There's a TTL output that's the amplified, cleaned up PD signal converted to TTL, and one or two logic signals that say the signal is strong enough. Most of the remaining pins are for bypass caps or

Google is no help, returning either this or a previous unproductive thread on this chip, or the Laser FAQ, where I also ask about it.

Thanks!

-- sam | Sci.Electronics.Repair FAQ:

Important: Anything sent to the email address in the message header above is ignored unless my full name AND either lasers or electronics is included in the subject line. Or, you can contact me via the Feedback Form in the FAQs.

Here is a schematic with the part:

The pin labeling of the U1 are guesses.

Thanks!

-- sam | Sci.Electronics.Repair FAQ:

Important: Anything sent to the email address in the message header above is ignored unless my full name AND either lasers or electronics is included in the subject line. Or, you can contact me via the Feedback Form in the FAQs.

On 12 Aug 2009 19:18:30 -0400, snipped-for-privacy@repairfaq.org (Samuel M. Goldwasser) put finger to keyboard and composed:

FWIW, usbid.com identifies the manufacturer of the 1826-0775 device as NS (National Semiconductor?). I wouldn't trust this info, though.

Is there a patent number on the equipment?

- Franc Zabkar

photodiode.

external.

converted

enough.

is

in the

Plenty of 4-4 digit type codes , but not that one in

HP OPTOELECTRONIC 1986 HP OPTOELECTRONIC 1982 hp opto 1988

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