Samuel M. Goldwasser wrote in message
...
(Samuel M. Goldwasser) writes:

Franc Zabkar writes:

On 12 Aug 2009 09:42:50 -0400, (Samuel M.
Goldwasser) put finger to keyboard and composed:

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)?

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!

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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


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