|
|
|
|
|||||||
| 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. |
 |
|
|
Thread Tools |
2nd Jan 2019, 10:25 pm
|
#41 |
|
Dekatron
Join Date: Apr 2012
Location: Wiltshire, UK.
Posts: 13,995
|
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
|
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: 7,657
|
Re: "Elevated ground" Good idea?
It should be proscribed Les - prescribed = to recommend, proscribed = to forbid.
Andy.
__________________
Curiosity hasn't killed this cat...so far. |
|
|
