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georgeplhak
I could tell the story of how I blew up this previously working
counter by plugging it into a TM500 frame with some rear interface wiring and a broken key, if anyone is interested in a cautionary tale? In any case, today I have found the last of about seven chips that were fried and the counter now works again except for the most significant digit for which I need one of these Motorola latches. Many online parts places say that they have these chips but have multi hundred dollar minimum orders. Can anyone please suggest a reasonable source, or might you have one or two onhand that I could purchase? Thanks much George Plhak Acton, Ontario, Canada |
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georgeplhak
TEK DC503
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--- In TekScopes@..., "jbarnes" <jbarnes@...> wrote:
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I have a CD4035AN if you want it.
I can't tell if it's the same as the MC4035P (the pkg should be the same). Here's a data sheet for the CD4035 if it helps you sleuth it out - You're welcome to it, just give me your address - Dan _____ From: TekScopes@... [mailto:TekScopes@...] On Behalf Of georgeplhak Sent: Monday, January 29, 2007 7:28 PM To: TekScopes@... Subject: [TekScopes] Need MC4035P chip for a DC503 I could tell the story of how I blew up this previously working counter by plugging it into a TM500 frame with some rear interface wiring and a broken key, if anyone is interested in a cautionary tale? In any case, today I have found the last of about seven chips that were fried and the counter now works again except for the most significant digit for which I need one of these Motorola latches. Many online parts places say that they have these chips but have multi hundred dollar minimum orders. Can anyone please suggest a reasonable source, or might you have one or two onhand that I could purchase? Thanks much George Plhak Acton, Ontario, Canada |
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faustian.spirit
Would the Mot equivalent for a CD4035 not be MC14035, as opposed to
MC4035? --- In TekScopes@..., "Dan Meeks" <dan-meeks@...> wrote: same). On Behalf Of georgeplhak |
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Luis Cupido
Correct,
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The MC4035 is NOT a CD4035 (the MC14035 is a CD4035). luis c. ct1dmk ----- Original Message -----
From: "faustian.spirit" <faustian.spirit@...> To: <TekScopes@...> Sent: Tuesday, January 30, 2007 9:00 AM Subject: [TekScopes] Re: Need MC4035P chip for a DC503 Would the Mot equivalent for a CD4035 not be MC14035, as opposed to |
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Luis is absolutely right. I am pretty sure that the design of the DC503 was before 4000 series of CMOS was invented.
I did find a referenceto the MC4035P. It was described as a quad 'D' type latch with open collector outputs. I looked at the schematics of the later DC50xA counters and they do not use these chips. I think the best source is another DC503. They are selling pretty cheap on eBay. Regards, John Correct, ________________________________________________________________ Sent via the WebMail system at aztec-net.com |
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Here is a datasheet for it:
Ciao Peter -----Ursprüngliche Nachricht----- Von: TekScopes@... [mailto:TekScopes@...] Im Auftrag von jbarnes Gesendet: Dienstag, 30. J?nner 2007 13:40 An: TekScopes@... Betreff: Re: [TekScopes] Re: Need MC4035P chip for a DC503 Luis is absolutely right. I am pretty sure that the design of the DC503 was before 4000 series of CMOS was invented. I did find a referenceto the MC4035P. It was described as a quad 'D' type latch with open collector outputs. I looked at the schematics of the later DC50xA counters and they do not use these chips. I think the best source is another DC503. They are selling pretty cheap on eBay. Regards, John Correct, ________________________________________________________________ Sent via the WebMail system at aztec-net.com Yahoo! Groups Links The information contained in this e-mail message is privileged and confidential and is for the exclusive use of the addressee. The person who receives this message and who is not the addressee, one of his employees or an agent entitled to hand it over to the addressee, is informed that he may not use, disclose or reproduce the contents thereof. |
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Luis Cupido
Peter, thas is an MMC which is a 4000 series cmos IC
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that is equal to the CD4053. The MC4035P is a motorola "only" IC, much older with no equivalent as far as I know. Luis ct1dmk ----- Original Message -----
From: "Ullrich Peter" <peter.ullrich@...> To: <jbarnes@...>; <TekScopes@...> Sent: Tuesday, January 30, 2007 12:49 PM Subject: AW: [TekScopes] Re: Need MC4035P chip for a DC503 Here is a datasheet for it: Ciao Peter -----Urspr???ngliche Nachricht----- Von: TekScopes@... [mailto:TekScopes@...] Im Auftrag von jbarnes Gesendet: Dienstag, 30. J???nner 2007 13:40 An: TekScopes@... Betreff: Re: [TekScopes] Re: Need MC4035P chip for a DC503 Luis is absolutely right. I am pretty sure that the design of the DC503 was before 4000 series of CMOS was invented. I did find a referenceto the MC4035P. It was described as a quad 'D' type latch with open collector outputs. I looked at the schematics of the later DC50xA counters and they do not use these chips. I think the best source is another DC503. They are selling pretty cheap on eBay. Regards, John Correct, ________________________________________________________________ Sent via the WebMail system at aztec-net.com Yahoo! Groups Links The information contained in this e-mail message is privileged and confidential and is for the exclusive use of the addressee. The person who receives this message and who is not the addressee, one of his employees or an agent entitled to hand it over to the addressee, is informed that he may not use, disclose or reproduce the contents thereof. Yahoo! Groups Links |
Peter, thas is an MMC which is a 4000 series cmos IC that is equal to theCD4053. The MC4035P is a motorola "only" IC, much older with no equivalent as far as Iknow. Ooops, sorry - so again the wrong part. I had a look for this part in our stock but I could not find one... Sorry. Ciao Peter The information contained in this e-mail message is privileged and confidential and is for the exclusive use of the addressee. The person who receives this message and who is not the addressee, one of his employees or an agent entitled to hand it over to the addressee, is informed that he may not use, disclose or reproduce the contents thereof. |
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faustian.spirit
--- In TekScopes@..., "Luis Cupido" <cupido@...> wrote:
Auftrag vonDC503 was before 4000 series of CMOS was invented. Can somebody confirm this? Is this design THAT old? type latchFrom photos of that unit, it looks like "mostly garden variety TTL". If this isn't in a speed-critical circuit... why don't replace it with a daughterboard with two 7474 (or possibly one 74174 would do) and a 7406? not use these chips.cheap on eBay.thereof.
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georgeplhak
Since when was being OLD a problem? (grin)
OLD test equipment is very good when it still works and is useful. Because the DC503 is discrete TTL, it is easy to fix and parts should be available and they generally are, except for these peculiar (as someone pointed out) Motorola proprietary chips. This DC503 now works fine by the way. I rearranged the chips so that only one digit (currently the MSD) is unlit, the rest of the instrument counts beautifully. I'd estimate it is of 1975-77 vintage. If only things today were so robust?! Thanks for your interest. George --- In TekScopes@..., "faustian.spirit" <faustian.spirit@...> wrote: 7406? not use |
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icembreros_cadic
Yes the chip design is more than 35 years old.-----Ursprüngliche Nachricht-----Auftrag It appears in my Motorola TTL Integrated Circuits Data Book, First Edition of 1971 |
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faustian.spirit
--- In TekScopes@..., "icembreros_cadic" <eb4apl@...> wrote:
I thought CD4xxx had been on the market by then... what do I know,Yes the chip design is more than 35 years old.-----Ursprüngliche Nachricht-----Auftrag it's older than me for sure :) |
Peter Ullrich