Jeff, you mention early in this video that some sources say the monolithic 'A/D converter & display driver' IC in this meter is a proprietary IC, while others say it is a Maxim # ICL7017CPL. The ICL7107 is the LED display version of the nearly ubiquitous '7106' that was designed by Fluke (in a slightly different version they called 429100 for their 8020A DMM, ) but manufactured by Intersil, then by Harris, then by Maxim. The 7106 was the version with the integral LCD display driver, while the companion 7107 IC was the same except for having an LED display driver. It seems that Intersil still exists in some form, somehow associated with Renesas, but in a quick search it seems they no longer make the 7106 & 7107 themselves. Maxim shows these as a current product; Digikey does not stock them (at least not in the 40 pin DIP package) but lists them as current/active product and of this writing they had access to at least 500 of them for immediate shipment, and Mauser Electronics shows the 40 pin DIP version as current product and in stock. So: - The 7107 is NOT a proprietary IC (I wonder why some sources say this...maybe somebody was just guessing at what the chip is) - This Heathkit IM-2260 DOES use the ICL7107 IC as its A/D converter/LED driver, and the Heathkit schematics I have for the IM-2260/IM-2262/IM-2264 family of DMMs all clearly show either the ICL7107 or ICL7106 as the A/D IC - The 7107 (and 7106) are apparently still being manufactured as an active product, and they can be obtained via major electronics parts distributors; no searches for new-old-stock are required.
I'm a retired biomedical engineer. Airshields used Intersil ICL7107CPL in their C-100 neonatal incxubator controllers that I used to maintain. I've got a handful of ICL7106 and ICL7107 NOS chips if anyone wants one
Hi a good video, as usual. Thank you for posting soon. I will post a video on the same device, and I expect you will find it interesting God Bless you.
Great post Jeff. A very good kit but to get one built is the only way now. I appreciate more videos during this virus crisis time.
Hi Jeff. This is Peter Pridham l lived two houses from you in India in 1968 to 1971. My dad Ken was working for AECL.
I have missed being able to go to the Heathkit store. There used to be one in Anaheim California on Ball Road east of Disneyland.
Your collection and videos are AWESOME!!!
Jeff, you mention early in this video that some sources say the monolithic 'A/D converter & display driver' IC in this meter is a proprietary IC, while others say it is a Maxim # ICL7017CPL.
The ICL7107 is the LED display version of the nearly ubiquitous '7106' that was designed by Fluke (in a slightly different version they called 429100 for their 8020A DMM, ) but manufactured by Intersil, then by Harris, then by Maxim. The 7106 was the version with the integral LCD display driver, while the companion 7107 IC was the same except for having an LED display driver. It seems that Intersil still exists in some form, somehow associated with Renesas, but in a quick search it seems they no longer make the 7106 & 7107 themselves. Maxim shows these as a current product; Digikey does not stock them (at least not in the 40 pin DIP package) but lists them as current/active product and of this writing they had access to at least 500 of them for immediate shipment, and Mauser Electronics shows the 40 pin DIP version as current product and in stock.
So:
- The 7107 is NOT a proprietary IC (I wonder why some sources say this...maybe somebody was just guessing at what the chip is)
- This Heathkit IM-2260 DOES use the ICL7107 IC as its A/D converter/LED driver, and the Heathkit schematics I have for the IM-2260/IM-2262/IM-2264 family of DMMs all clearly show either the ICL7107 or ICL7106 as the A/D IC
- The 7107 (and 7106) are apparently still being manufactured as an active product, and they can be obtained via major electronics parts distributors; no searches for new-old-stock are required.
Thanks for the detailed info on the A/D chip.
Very nice looking DMM, great detailed explaination sir!
Nice job!
I love your videos A1 from Down Under Oz
I'm a retired biomedical engineer. Airshields used Intersil ICL7107CPL in their C-100 neonatal incxubator controllers that I used to maintain. I've got a handful of ICL7106 and ICL7107 NOS chips if anyone wants one
Hi a good video, as usual. Thank you for posting soon. I will post a video on the same device, and I expect you will find it interesting
God Bless you.