Component ID: HP 1826-0775 1DA7Q

[Samuel M. Goldwasser]

This is part of the optical receiver found in various Hewlett Packard
metrology lasers.

The HP part number is 1826-0775.

HP references a manufacturer part number of 1DA7Q.

It's a 16 pin DIP dating from the early 1980s.

Any info appreciated.

Thanks!

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[Franc Zabkar]

This is part of the optical receiver found in various Hewlett Packard
metrology lasers.

The HP part number is 1826-0775.

HP references a manufacturer part number of 1DA7Q.

It's a 16 pin DIP dating from the early 1980s.

Any info appreciated.

Thanks!

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

Does the HP cross-reference include a manufacturer code?

Is the chip powered?

+5V or some other voltage(s)?

- Franc Zabkar

 

[Samuel M. Goldwasser]

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

Does the HP cross-reference include a manufacturer code?

Is the chip powered?

+5V or some other voltage(s)?

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!

--
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Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
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ignored unless my full name AND either lasers or electronics is included in the
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[Samuel M. Goldwasser]

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!

Here is a schematic with the part:

http://www.repairfaq.org/sam/hp18rsch.pdf

The pin labeling of the U1 are guesses.

Thanks!

--
sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/
Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
+Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
| Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html

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.

 

[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.

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

 

[N_Cook]

Here is a schematic with the part:

http://www.repairfaq.org/sam/hp18rsch.pdf

The pin labeling of the U1 are guesses.

Thanks!

--
sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/
Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
+Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
| Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html

Important: Anything sent to the email address in the message header above is
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Plenty of 4-4 digit type codes , but not that one in

HP OPTOELECTRONIC 1986
HP OPTOELECTRONIC 1982
hp opto 1988