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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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2nd Jan 2019, 10:25 pm | #41 |
Dekatron
Join Date: Apr 2012
Location: Wiltshire, UK.
Posts: 14,005
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Re: "Elevated ground" Good idea?
In the context of 'elevated ground' I'm reminded of various predominantly US-originated AC/DC radios reord-players and audio-amps which avoided the whole live-chassis issue by using a bus-bar [typically a 16-Gauge copper wire] supported on tagstrips for the AC/DC negative line, isolated from the chassis.
RF/AF decouplers still connected to the chassis, which was in turn connected to the negative bus-bar via a lowish-value (0.05uF or so) capacitor and a bleed-resistor of 100KOhm or so. This avoided the chassis being live if you plugged the [reversible] supply-plug into the socket the wrong way round. I've even seen some guitar-amps built this way [yes, the 'states had plenty of live-chassis AC/DC electric-guitar amp designs....] |
3rd Jan 2019, 12:08 am | #42 |
Nonode
Join Date: Dec 2012
Location: Kirk Michael, Isle of Man
Posts: 2,350
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Re: "Elevated ground" Good idea?
Andy, #38, you say:-
So the chassis above does not have an earth wire as proscribed, it's earthed via the connector which is very highly unlikely to fail. Should that be PRESCRIBED or PROSCRIBED? I suspect a slip of the pen, but it DOES matter. Les. |
3rd Jan 2019, 10:50 am | #43 |
Dekatron
Join Date: Jul 2009
Location: Sleaford, Lincs. UK.
Posts: 7,667
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Re: "Elevated ground" Good idea?
It should be proscribed Les - prescribed = to recommend, proscribed = to forbid.
Andy.
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