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  1. S

    Can I use a resistor as a fuse?

    Apparently my query went to somebody who directs queries to the various 'support groups' within the organization. What they want is a model number of a specific instrument (not the old Hewlett Packard name), so that my query can be handed-off to somebody familiar with that specific instrument...
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    Can I use a resistor as a fuse?

    I'll find something to send him. It looks like he'll then have to send the query to some other 'support group'. The issue is: I'm still repairing old HP T&M gear. Agilent refused to support (the old) HP gear, as they were only interested in the 'AGILENT' product line. Their lack of support...
  3. S

    Can I use a resistor as a fuse?

    I don't build 'em, I don't design with 'em, and now I know that zero ohm resistors don't even exist! I talked to another tech here with 52 years on HP gear (Hewlett Packard/Agilent/Keysight). Like me, he didn't give zero ohm resistors much thought other than replacing them. He said it's obvious...
  4. S

    Can I use a resistor as a fuse?

    BobK, I know, I know, I know. I'll say what I found out: most mfgrs don't specify a tolerance. BUT SOME DO. I don't know why, I assume it's a percentage of that 3 milli ohm value. For 99% of the electronics community, a zero ohm resitor is zero ohms. For 1%, it isn't. I'm tired trying to...
  5. S

    Can I use a resistor as a fuse?

    Update: Keysight sent me an email saying my query was routed to Germany, but that they forwarded it back to the U.S. So I'm still waiting on that. Talked to an old HP Engineer who retired. He said the zero ohm resistor is simply a machine-insertable jumper wire. Then he got...
  6. S

    Can I use a resistor as a fuse?

    Nothig from Agilent/Keysight yet. I expect them to tell me what KrisBlueNZ and davenn alreay did; I just want to hear what they say. I've still got email contacts from old HP engineers I used to talk to a lot (retired now). I'm going to drop one of them a line about this. I never really...
  7. S

    Can I use a resistor as a fuse?

    The HP/Agilent part number is 8159-0005 Resistor Fixed- zero ohms. Yeah, I didn't get the 1% or 5% Tolerance Rating on those zero ohm resistors either. I don't know how you determine a tolerance on zero ohms. I don't build 'em, I just broke one open. I also don't design with 'em, I just fix T&M...
  8. S

    Can I use a resistor as a fuse?

    Apparently, I am wrong. I was explaining the experiences I have had with them. Apparently not what they're designed for. I mostly see zero ohm resistors rated at 5% tolerance, though I have seen some rated at 1% tolerance. So they do have resistance, and in the situations I've seen, they do...
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    Can I use a resistor as a fuse?

    Sounds completely electronically logical to me. It makes perfect sense to me that HP engineers don't intend a zero ohm resistor to be fusible. All I can tell you after 44 years of repairing their gear: Is that zero ohm resistor has fused a hundred times and saved me a heck of a lot of extra...
  10. S

    Can I use a resistor as a fuse?

    Here's one to consider. I work on a lot of Hewlett Packard/Agilent/Keysight test and measurment instruments. They use 'zero ohm' resistors that act as fuses between circuits. They're readily available, and the ones I see look like regular resistors, but have a single black band in the center...
  11. S

    choosing capacitor values

    I'm thinking we need a little more information about your power supply type. This used to be a pretty generic question, with electrolytics being the answer (ceramics are mostly used for higher frequency applications). Some of he power supplies I'm seeing these days are pretty complex, and can...
  12. S

    Looking for (really) old construction article

    Maybe Popular Electronics has an archive. Did you contact them to ask?
  13. S

    Can't find proper fuse!

    I just went around and around with Bussmann about one of their 5x20mm fuses myself. Bussmann got bought by Cooper,which then got bought by Eaton. I had to email Eaton to ask a question about a Bussmann 5x20mm fuse. I finally get fed-up, and bought a pack of Schurter 5x20mm fuses. They seem to...
  14. S

    CRT TV doesn't turn on

    So, can you tell where the 'tick' sound is coming from? A relay that might be bad?
  15. S

    CRT TV doesn't turn on

    Did you check the physical and electrical operation of that on-off switch? (An ohmeter with the set unplugged, across the on-off switch to see if you have continuity). Did you look for any blown fuses. Most TV's have one fuse, but some have two fuses, one for input power and one for B+ power...
  16. S

    No Color. Black and White Picture

    You probably have a circuit problem, but from your description I'd eliminate the pots as a potential source of problems. I'd replace both the 'color' and 'tint' pots, and then see what you've got. Like I said, a bad pot will result in your issue. good luck
  17. S

    CRT TV doesn't turn on

    Lots of questions, will take a shot at some of them. The broken front panel legs most likely WERE the reason the set wasn't turning on. If the panel isn't secure, when you depress the on-off button, the whole switch can move backwards instead of just depressing the switch for activation. That...
  18. S

    How to create a counter with a vibration sensor

    Still wondering about the need for piezo sensor. Did you try Gooling for vibration switches (sensors), to see if something else might work in your application. My first hit was from Electrodragon for their SW-18020P. It sounds to me like it would do what you want, and it's cheap. There are a...
  19. S

    How to create a counter with a vibration sensor

    I'm wondering what your application is, that requires a piezo element. For single pulse inputs I would think there might be a better way. What is it that you need a piezo sensor to pick-up a vibration of? The main reason I question the application for a piezo element sensor,is that I would...
  20. S

    Halloween prop - wiper motor - question on walwart

    How about a potentiometer to vary the input voltage to the motor.
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