Jeffs quickie page of vintage LEDs:
Light Emitting Diode displays and panels
I freely admit that my web site is NOWHERE as neat
Micah Mabelitini's decadecounter.com
nor is my collection as complete as Dan Veeneman's
but I have MANY of these displays too,
particularly the smart hex and alphanumeric ones
(16 segment as well as 5x7 matrix).
The red one in top center is a
Monsanto MAN 64A 7 segment
On the left side:
On the right side:
- 3: HP HDSP-6508: 8 char 16 segment lens "dumb" display
3.81mm (0.15") character height, common cathode
- 5: DL1414: 4 char 16 segment lens 6 x 2 pin "smart" displays
0.6" red LED 7 segment displays (the same as the 6 digit clock display)
- 3: TIL311
"smart" hex (0.3" tall with left and right
Numeric, left-hand decimal point (the hex ones are in a breadboarded circuit)
- 10: TI DIS1417 Hexadecimal Display w/ Logic (same as TIL311)
On the left side:
In the center with the green inside: 2: Siemens PD 2437 4 char 5x7 "smart" modules.
- 4: HP
: 8 char 5mm high LED Yellow 585nm 5x7 Smart Display.
They're clearly thinner from top to bottom than the older ones next to them.
- 3: HP QDSP-2020: RED 4 char 5x7: 6 x 2 pins.
They're the smallest case for 4 characters but there's no no character generator. It's just a per-column shift-register.
Not shown: a new box of 10: HP QDSP-2278 from BJ Micro.
On the right side:
Teeny magnifier-top LEDs: 3 digit, 5 digit 5082-7466
- 5: HDLG-2416: smart module: 4 char green 5x7 LED 5mm, now from Avago Technologies US Inc. I have several more salvaged from Dell PCs.
- 1: HPDL2416 RED 4 char 16 segment 4.10 mm (0.160") w/magnifiers! It an 18 pin "smart" module (HP is now "Agilent"). I have several more salvaged from equipment
14 segment display modules
On the left:
2: single char Ledtech # LA3921-11B from
$0.50 each, $0.45 each for 10 or more
14-segment with decimal point. Green LEDs on grey background.
0.39" (10.0 mm) height alphanumeric display
LA is common anode, LC is common cathode
center: IEE 3785R 2 character displays.
Instead of a common cathode or anode per character,
they're divided diagonally into 7 segments per common
so an 8x8 matrix driver chip (such as the Maxim 7219)
can drive 4 characters with decimal points.
on this separate page just for the IEE 3785R
right: Dan Wobser's wonderful find for IXR:
2 character 14 segment LED modules with built-in controller
(spec sheet, pdf format)
These smart modules are used in this
homebrew wifi stock ticker display
I'm starting a project with a .6" center
Experimentor 600 breadboard
HP 5082-7340 hex displays!
They edge stack nicely, unlike the TI TIL311 or DIS1417
(those have pins underneath them just like .3" DIPS,
which would place them in the wrong orientation for breadboarding).
This is part of my "hall of shame". Long ago, Radio Shack
(and mail order catalogues) sold faulty/fallout chips marked as "hobby"
since they were otherwise too expensive.
I tried following the suggested circuit for the 5311 clock
only to find ALL 3 of my chips were faulty.
The DL-747 0.6" tall LEDs are still nice, and cost $4.95 EACH at the time
(Archer cat no 276-056).
The LED mux PCB was a Radio Shack part too!
16 LEDS with transistor drivers.
They'd look pretty mounted on a panel.
Definitely a Canal St find, probably from Ramco
since the gold edge connector was cut off.
A Radio Shack kit:
7 segment display, 7447 (BCD to 7-segment Decoder/Driver)
7475 (4 bit latch) and a socket for a counter (a 7490 Decade Counter?)
wiki's list of 74xx chips
I made this panel long long ago,
probably for a homebrew EPROM programmer
(a step up from the one a classmate made using only toggle switches.
My college was so poor we had NO EPROM programmers in the early 80s)
I guess I had intended to use the lower pushbuttons to set (or toggle) the 8/16 bits
with the upper switches for "clear all", increment address,
decrement address, load data, load address, burn data.
The calculator buttons were a Radio Shack item, so they're probably in many homebrew projects.
I abandoned the project because it was just too tedious.
I'm unsure if these are manufactured BY AT&T, Western Electric or FOR AT&T.
I got them around 1988 while working at AT&T.
They are ¼" diameter with evenly cut leads.
The clear LED is bonded to a green diffuser.
Just the part numbers
Here are just the part numbers to clarify the variations for color and characters
hdsp_48xx 10-Element Bar Graph Array
- HDSP-4820 Red
- HDSP-4830 HER (high efficiency red)
- HDSP-4840 Yellow
- HDSP-4850 Green
- HLCP-J100 AlGaAs
- HDSP-4832 3 HER/4 Yellow/3 Green
- HDSP-4836 2 HER/2 Yellow/2 Green/2 Yellow/2 HER
The Hewlett-Packard 5082-73xx series displays are individual 4x7 LED matrix arrays
with decoder/drivers and memory.
the new Avago part numbers
(Spec sheet here)
- 5082-7300 - decimal (right-hand decimal point)
- 5082-7302 - decimal (left-hand decimal point)
- 5082-7304 - matching +/- 1 (LED only, no driver, no latch)
- 5082-7340 - hexadecimal
where x is
- HDSP-076x High-Efficiency Red Low Power
- HDSP-077x High-Efficiency Red High Brightness
- HDSP-086x Yellow
- HDSP-096x Green
- 0 for decimal, Right Hand DP (decimal point)
- 1 for decimal, Left Hand DP
- 2 for hexadecimal
- 3 for Over Range +/- 1 with right hand DP
Texas Instruments hexadecimal display with logic
0.3" pins underneath, vertical
HP HDSP-200x series 4 character 5x7 array "dumb" shift-register LED.
The column inputs need to source half an ampere
(but it may be from a separate power source than the logic Vcc).
- HDSP-2301 Yellow
- HDSP-2302 High Efficiency Red (IBM P/N QDSP-2278)
- HDSP-2303 Green
1-column 1 data in-12
2-column 2 gnd-11
3-column 3 clock-10
5-column 4 Vcc-9
5-column 5 blanking-8
6-do not use data out-7
4 char 16 segment MAGNIFIER smart display unit
DL-1414 HPDL-1414 12 pins 0.112 character height
DL-2416 HPDL-2416 18 pins 0.160
4 Character 5.0 mm (0.20 Inch) 5 x 7 Alphanumeric Display for Sunlight Viewable Applications
- HDSP-2351 Yellow
- HDSP-2352 High Efficiency Red
- HDSP-2353 High Performance Green
Four Character 5.0 mm (0.2 inch) Smart 5 x 7 Alphanumeric Displays
Eight Character 5 mm and 7 mm Smart Alphanumeric Displays
- HDSP-210x Series
- HDSP-211x Series
- HDSP-250x Series
AlGaAs High Efficiency
Font Height Red Red Orange Yellow Green
0.2 inches HDSP-2107 HDSP-2112 HDSP-2110 HDSP-2111 HDSP-2113
0.27 inches HDSP-2504 HDSP-2502 HDSP-2500 HDSP-2501 HDSP-2503
HDSP-253X Series Eight Character 5 mm Intelligent Alphanumeric Display
- HDSP-2530 Orange
- HDSP-2531 Yellow
- HDSP-2532 HER (High Efficiency Red)
- HDSP-2533 Green
- HDSP-2534 AlGaAs Red
Siemens PD 243x series of 0.2" 4 character 5x7 dot matrix alphanumeric programmable display
- PD 2435 red (630 nm)
- PD 2437 green (560 nm)
4 character 5.0mm (0.2 inch) smart 5x7 alphanumeric displays
- enhanced drop in replacement for HPDL-2416
- 128 ASCII character set
- HDLR-2416 standard Red
- HDLS-2416 AlGaAs Red
- HDLU-2416 AlGaAs Red
- HDLO-2416 high efficiency Red
- HDLA-2416 Orange
- HDLY-2416 Yellow
- HDLG-2416 Green
Litronix DL-747: 0.6" red LED 7 segment display
Lafayette MAN64A all-led 7 segment readout
Radio Shack 276-055 3 digit LED calculator display
Archer (Radio Shack) FNA30 9 digit 7 segment LED display
spec sheet for FNA30, common for calculators
Schematic for an un-named MOS calculator chip and the required driver chips.
Siemens DLx2416 LED module 4: 5x7 characters @ 0.2 inch (pdf)
has info on HP LED modules
sells vintage displays
Trammell Hudson's Alphawatch
uses an HDSP211x alphanumeric display (8 character module @ 5x7 yellow led)
Dave McGuire made the THB: Temperature, Humidity, Barometric Pressure
Avago HDSP-2531 Eight Character 5 mm Smart Alphanumeric Display
Thanks to Glitch,
I'm slowly catching up to Dave's stash of
mil-spec green hex display modules
Digital display. Hexadecimal, smart 4 x 7 dot matrix LED display.
No decimal point, 0.29".
0-9, A-F, base 16 operation. Blanking control, conserves power.
On-board decoder driver, with 5-bit memory. High reliability, ceramic glass dip