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Re: In search of the "Safest" bench test setup
aobp11
Hello Stefan, your example is illustrative but not very realistic
for my DUTs: usually TEK 'scopes or plug-ins that need repair. Nearly no internal circuits are floating w.r.t. chassis. Another point is that you and other members praise our European GFI system. I hope everyone recognizes the limited value of GFI as mentioned e.g. by Bob Krassa. GFI doesn't protect against internal current loops through your body. It only protects in case of accidentally touching at the same time one of the primary wires to the mains power transfomer (not using an isolation transformer) and other parts of the circuitry or chassis. Why do those power transformer have so many secondary windings? Otherwise you could install a GFI in the secondary circuit! Albert --- In TekScopes@..., "Stefan Trethan" <stefan_trethan@...> wrote: ----inside is not connected to the metal case. The metal case is firmlyearthed, but the supply is isolated. Now your finger is stuck into the case,touching some component by accident. Your hand also touches the case (ornot, doesn't matter, but it's likely). There will be no current, thecircuit point you touched will simply be pulled to earth. You wereprotected against first fault without even a jolt or power shutoff (like aGFI would give you). |
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Re: Need MC4035P chip for a DC503
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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Re: Need MC4035P chip for a DC503
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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P6017 probe anyone?
william_b_noble
here's the link - I can't use this probe:
Also have a newer/fancier Tek probe that uses F connector, has a circular box behind the probe itself that has coils caps and a pot inside, the tip of the probe says P6008 10X 10meg, 7 pf - and P6006 BNC << two of these and 6027 UHF if anyone can use any of these, make me an offer - you can email me off the list of course oh, and (shudder) an HP 10014A probe |
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Spectrum Analyzer
David C. Hallam
I am looking for a good used spectrum analyzer and am not familiar with the
Tektronix line of equipment. I don't need the latest and greatest, but just a reliable unit that will cover the spectrum of 1 KHz to about 150 MHz. Cost is a consideration as I would use it infrequently. My hobby is refurbishing old tube type amateur radio equipment. What I am looking for would be a unit similar to a 8557A or 8553B in the HP line. Can anyone suggest something in TEK line that would be of value to me? David KC2JD/4 |
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Re: Need MC4035P chip for a DC503
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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Re: Need MC4035P chip for a DC503
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 |
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Re: Need MC4035P chip for a DC503
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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Re: amateur tries to diagnose Tek 2465 blanking problem (long)
Russ
I found on my 2467 that the connections to the CRT plates are very close to the holes in the metal chassis to pass the wires through. I had to bend mine slightly to fix an intermittent problem somewhat similar to yours. I think the tube could possibly shift enough, especially if the scope has been shipped, to allow these connections to short to the chassis. Worth a look anyway before getting too involved with the electronics. (When in doubt scope it out.)
Russ WQ3X --------------------------------- Bored stiff? Loosen up... Download and play hundreds of games for free on Yahoo! Games. |
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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 |
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Re: Need MC4035P chip for a DC503
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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Re: Need MC4035P chip for a DC503
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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Re: Need MC4035P chip for a DC503
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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Re: Need MC4035P chip for a DC503
georgeplhak
TEK DC503
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--- In TekScopes@..., "jbarnes" <jbarnes@...> wrote:
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Need MC4035P chip for a DC503
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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WTB Part 475A Help!
wb9iog
Finally got around to checking my "new" unit out and after
making a test stand for it and study the shipment damage done to the B delay trigger slope/level control. Just about got it solved then lost a small clip to hold the shaft pressure against the variable resistance. Need it! Anyone got one? 10K pot with switch marked as 311-1192-00 10K 20 9250. I suspect that a plane 475 would be the same; either A or B control would work. Hope there are some junkers out there. If you have one with a bad switch or defective variable that's ok I can fix that my parts are good. It was just mechanical damage. Knob for the variable ?? Dead in the water with out it. Mike Iowa BTW the test stand I made probably works better than the standard plastic shroud. |
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Re: 496P Scams on eBay
John Miles
If this is who I think it is (Carla Morris at Consolidated Surplus), they
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are fine in my experience. I have bought and rented probably a dozen manuals from her. What happened in your case? -- john, KE5FX -----Original Message-----
From: TekScopes@... [mailto:TekScopes@...]On Behalf Of Lars Ahlstr???m Sent: Monday, January 29, 2007 1:39 PM To: 'Stefan Trethan'; TekScopes@... Subject: SV: [TekScopes] 496P Scams on eBay 3830616219 Is that a scam or not? I got fooled by it, but lost the dispute. I wanted a 2430A paper users manual. What did I get, do you think? ....a long nose. (means embarrasment in swedish) /Lars |
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Re: In search of the "Safest" bench test setup
At 21:48 29/01/2007, Stefan Trethan wrote:
I haven't needed my HV probes much, but you are right they are huge beasts.Virtually the only use I ever make of my, also non-Tek, HV probe is to check the CRT accelerating voltage on Tek scopes. As my probe also has a screw-in tip I have made up a Tee piece, using one lead with male connector from a failed HV tripler, one lead with female connector from a failed CRT and a further piece of HV lead connected to a compatible screw to replace the probe's tip, all connections heavily insulated. Now all I have to do is to replace the tip with the Tee, disconnect the anode lead, plug in my Tee and switch back on without having to get anywhere near anything nasty. Ben -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.432 / Virus Database: 268.17.12/655 - Release Date: 28/01/2007 13:12 |
Peter Ullrich
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