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Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets. |
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6th Sep 2017, 10:58 pm | #81 | |
Dekatron
Join Date: Jun 2015
Location: Biggin Hill, London, UK.
Posts: 5,215
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Re: A simple mistake?
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6th Sep 2017, 11:04 pm | #82 | |
Dekatron
Join Date: Jun 2015
Location: Biggin Hill, London, UK.
Posts: 5,215
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Re: A simple mistake?
Quote:
Somebody noticies that said scientist has a horseshoe nailed up in his lab. They ask the scientist 'I am surprised you are superstitious. Do you believe that that horseshoe will bring you good luck in your research' The scientist replies 'Of course I am not superstitious. I believe in proving things by experiment, in the scientific method. <pause> But as for the horseshoe bringing luck, I am told it works even if you don't believe in it' |
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6th Sep 2017, 11:06 pm | #83 | |
Dekatron
Join Date: Jun 2016
Location: London, UK.
Posts: 3,687
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Re: A simple mistake?
Quote:
The thing that killed me with this is the cheap 20MHz Goldstar scopes they put up there had burn marks all over the front of them. |
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7th Sep 2017, 12:58 am | #84 | |
Dekatron
Join Date: May 2010
Location: Greater Manchester, UK.
Posts: 18,724
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Re: A simple mistake?
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Graham. G3ZVT |
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7th Sep 2017, 1:58 am | #85 | |
Dekatron
Join Date: May 2010
Location: Greater Manchester, UK.
Posts: 18,724
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Re: A simple mistake?
Quote:
Mine concerns a new free-standing double oven/hob cooker that my sister-in-law bought. Whichever oven she used would overheat, uncontrollably. The retailer dispatched an engineer, but the ovens behaved themselves while he was there. They still overheated when she tried to cook anything, so a second engineer was dispatched, with the same result. At this point, in desperation, I was called in. It slowly dawned on me that with BOTH ovens on, they worked reasonably well, cycling on and off as expected, I imagine that was the engineers strategy. Only when one oven at a time was tried did the overheating occur, also tracing the wiring out showed no anomalies. Then I had a brainwave, I traced the capillary tube from the BOTTOM oven thermostat, it had been carefully positioned and clamped during manufacture en route to the TOP oven (and vice versa). Graham. G3ZVT |
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7th Sep 2017, 11:12 am | #86 |
Nonode
Join Date: Mar 2008
Location: Virginia Water, Surrey, UK.
Posts: 2,877
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Re: A simple mistake?
A friend got on to a government TV repair training course in 1975. Day one they were introduced to an Avo , and a TV chassis with known faults to find. They were instructed to "Put the Avo across the mains input to see if there is power arriving there" My friend's new colleague on his right carefully detached one Avo lead and managed to put that across the mains inlet. Predictable result. I think he failed the course.
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Jeremy, G8MLK, BVWTVM Friend, VMARS, BVWS Secretary. www.pamphonic.co.uk www.bttt.org.uk |
7th Sep 2017, 12:13 pm | #87 |
Dekatron
Join Date: Jun 2016
Location: London, UK.
Posts: 3,687
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Re: A simple mistake?
I think that sort of thing is quite common for new engineers.
We had one guy throw a battery across the room in the first lab we did because it had no volts. He had the red lead on the current terminal of the meter. The lab tech had explained this to him and unplugged the leads and we had drawn him a little picture showing how to do it. He plugged the leads in exactly the same again and nothing. This was incidentally how every DMM in the lab had a blown current fuse and glue gun glue in the unfused 10A range. Those of us who cared bought our own 1% resistors from Maplin and used them as current shunts because we were forbidden from replacing the fuses in case we broke anything. Sigh... |
8th Sep 2017, 3:02 pm | #88 |
Pentode
Join Date: Nov 2009
Location: Welshpool, Powys, UK.
Posts: 121
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Re: A simple mistake?
A very good lesson here about making assumptions. I assume most of us have done this.
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