Timeline for Mid 80's DIP8 and DIP14 Chip Identification
Current License: CC BY-SA 4.0
20 events
| when toggle format | what | by | license | comment | |
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| Mar 20, 2021 at 15:59 | vote | accept | namezero | ||
| Mar 15, 2021 at 18:00 | history | tweeted | twitter.com/StackElectronix/status/1371521582531817478 | ||
| Mar 15, 2021 at 17:10 | history | edited | SamGibson♦ | CC BY-SA 4.0 |
Site policy is not to add "solved" or similar to the title. The explanation in the new answer, and the fact it is not currently accepted, make it clear that (right now) this is only a _possible_ solution.
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| Mar 15, 2021 at 16:32 | comment | added | Hearth | @MichalPodmanický The higher-temperature version of the 74 series is the 54 series, not 84 (which I don't think exists). | |
| Mar 15, 2021 at 16:20 | history | edited | namezero | CC BY-SA 4.0 |
edited title
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| Mar 15, 2021 at 16:08 | comment | added | Adam Lawrence | +1 to OP - this is a great reference as to what a part identification question should look like for EE.SE. | |
| Mar 15, 2021 at 16:03 | answer | added | namezero | timeline score: 2 | |
| Mar 14, 2021 at 18:23 | history | edited | namezero | CC BY-SA 4.0 |
added 61 characters in body
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| Mar 14, 2021 at 17:41 | history | edited | namezero | CC BY-SA 4.0 |
added 2 characters in body
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| Mar 14, 2021 at 11:33 | history | edited | namezero | CC BY-SA 4.0 |
added 417 characters in body
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| Mar 14, 2021 at 6:03 | history | edited | namezero | CC BY-SA 4.0 |
cleaned up schematics
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| Mar 13, 2021 at 12:06 | comment | added | namezero | @ScienceGeyser As for IC4, maybe I should not have used the NPN circuit symbol; it's a TO92 with "RAC" labeled on the silkscreen; I suspect a shunt regulator based on that. Taking measurements will be my next step; I'm still looking at how to do that best. Could be ASICs, but there are only those two DIPs on this daughterboard with a number of passives. I will definitely update on findings. | |
| Mar 12, 2021 at 21:45 | comment | added | ScienceGeyser | You have a transistor with the base tied to ground and the collector and emitter tied together... Something must be wrong there. | |
| Mar 12, 2021 at 21:40 | comment | added | ScienceGeyser | Most likely ASICs. Looks like a Signetics logo on there. The best way to figure out a little black box is to measure inputs and outputs and have a guess at the function. If you need to replace them, that's going to be hard. | |
| Mar 12, 2021 at 19:42 | comment | added | Kevin White | It is often very useful to be able to determine which pins are ground and which one is the power supply to identify a device. Your schematic doesn't seem to give information about that. | |
| Mar 12, 2021 at 19:39 | comment | added | user208862 | Yes, I found some links refers to 700002BB, it is some ic used in avionics/transport made by Intersil in 2003. | |
| Mar 12, 2021 at 18:59 | comment | added | namezero | The 7422 doesn't have GND on Pin12; I suspect the 8422 being a date code. | |
| Mar 12, 2021 at 18:58 | history | edited | namezero | CC BY-SA 4.0 |
added 50 characters in body
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| Mar 12, 2021 at 18:53 | comment | added | user208862 | 7422 , 4 input NAND gates maybe, 8 version for higher temperature range in this case | |
| Mar 12, 2021 at 18:42 | history | asked | namezero | CC BY-SA 4.0 |