Seek Signetics 2518 or TI TMS3122 Shift Register IC

David Kulka · 15th June 2008, 03:41 PM

Can anyone help me locate a Signetics 2518 (or Texas Instruments TMS3122)? This is a recirculating shift register, needed for an EMT 250. Thanks for any help.

dale116dot7 · 5th July 2008, 01:50 PM

Oh boy.... in some cases I have found it necessary to replace an obsolete chip with a little PC board that duplicates its function. For a recirculating shift register, a HC4040 counter, a couple of flip-flops, and a little SRAM chip on a little daughter card would be something I'd be tempted to lay out and use.

David Kulka · 7th July 2008, 06:24 AM

Modding the unit was my fallback plan but I wound up ordering one through one of those overpriced "submit RFQ" parts brokers. It cost way too much, but at least I don't have to build a daughterboard, and the unit can stay original.

I rarely buy from that type of vendor, but broke down and did it this time.

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15th June 2008, 03:41 PM	#1
David Kulka Lives for gear Join Date: Oct 2004 Location: Burbank, CA, USA Posts: 672	Seek Signetics 2518 or TI TMS3122 Shift Register IC Can anyone help me locate a Signetics 2518 (or Texas Instruments TMS3122)? This is a recirculating shift register, needed for an EMT 250. Thanks for any help. __________________ http://studioelectronics.biz Service & Restoration of UREI dbx Eventide Marshall AMS Tube Gear and more

7th July 2008, 06:24 AM	#3
David Kulka Lives for gear Join Date: Oct 2004 Location: Burbank, CA, USA Posts: 672	Modding the unit was my fallback plan but I wound up ordering one through one of those overpriced "submit RFQ" parts brokers. It cost way too much, but at least I don't have to build a daughterboard, and the unit can stay original. I rarely buy from that type of vendor, but broke down and did it this time. __________________ http://studioelectronics.biz Service & Restoration of UREI dbx Eventide Marshall AMS Tube Gear and more

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5th July 2008, 01:50 PM	#2
dale116dot7 Lives for gear Join Date: Dec 2003 Location: Calgary, Alberta Posts: 515	Oh boy.... in some cases I have found it necessary to replace an obsolete chip with a little PC board that duplicates its function. For a recirculating shift register, a HC4040 counter, a couple of flip-flops, and a little SRAM chip on a little daughter card would be something I'd be tempted to lay out and use.