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Old 28th Jun 2012, 11:55 pm   #1
SteveSmit
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Join Date: Mar 2011
Location: Derby, Derbyshire, UK.
Posts: 48
Default Analogic AN2546 Digital Panel Instrument

I've just acquired this neat looking device. Not entirely sure what its capabilities are, or what I'd really use it for, but I couldn't see it go in the bin.

It's a four digit plus leading '1' seven segment plasma display that had been adapted by Fylde for use in one of their modular blue panelled instrumentation setups. It's quite a hefty unit on its own, and has a bewildering number of pins on the back, so I think it has quite a bit of built in capability to just take and read signals (as opposed to something external having to drive the segments directly), judging by the fact that it only had four pins connected to something external at the back. By the looks of the wiring colours, two were simply mains power, and the other two were signal, shunted to some degree by a bank of resistors.

Interesting little bit of kit. Wonder if I could build some sort of bit of fun voltage display for a device with it.
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Old 29th Jun 2012, 9:34 am   #2
AVO_VCM163
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Default Re: Analogic AN2546 Digital Panel Instrument

The Analogic instruments are very reliable and stable. I have used loads in the past although not the 2546.

Attached is a pinout fror the 2544 which is probably very similar, although the 2544 has a 39999 count.

Also HERE is a user manual for the earlier 2535 which gives some good ideas for applications.

Roy
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Old 9th Jul 2012, 11:40 pm   #3
SteveSmit
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Default Re: Analogic AN2546 Digital Panel Instrument

Thanks very much for the information, much appreciated.
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Old 26th Jun 2016, 6:58 pm   #4
Babbadge
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Default Re: Analogic AN2546 Digital Panel Instrument

I just did a repair of a 1970's Analogic AN2546 and found out the following.

J2 upper connector
1 SIGNAL +
2 SIGNAL -
3 NC
4 DP1
5 NE555out 388Hz block wave?
6 NC
7 NC
8 DIG5B1 (+5V when >1 or <-1)
9 NC
10 NC
11 100Hz block wave?
12 DP3
13 STROBE
14 HOLD/SAMPLE
15 +5V

A NC
B ANALOG GND
C NC
D DP2
E NE555 reset?
F NC
H NC
J SIGN (+5V when >=0)
K NC
L NC
M CD4013 pin 13?
N DP4
P NC
R EXTERNAL TRIGGER
S DIGITAL GND

J1 LOWER CONNECTOR
1 110V~
2 NC
3 110V~
A 230V~
B NC
C 230V~
Rest: NC

The voltage differential between SIGNAL+ and SIGNAL- must be between -2V and +2V.
To get a decimal point in a certain place, connect DPx to GND (pin S).

The following sections of the AN2535 manual also apply to the AN2546:
  • Figure 5
  • Grounding
  • Figure 6

As for the repair: the DS8880 chip on the display board was faulty and I managed to find a replacement SN75480 on Aliexpress. Now it's working fine again!
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