What is this symbol? - UK Vintage Radio Repair and Restoration Discussion Forum

Emibell · 24th Jun 2020, 10:22 pm

I’m sure this is a dumb question and the answer is very simple... but can anyone tell me what the broken circles highlighted by yellow rings mean on this circuit diagram.
Sorry they are small and a bit difficult to see but there are three of them inside the yellow circles.

The General · 24th Jun 2020, 10:28 pm

They represent connectors, & the broken circles represent the shield of the screened cables.

Mark

Emibell · 25th Jun 2020, 6:43 am

Quote:

Originally Posted by The General

They represent connectors, & the broken circles represent the shield of the screened cables.

Mark

Thanks Mark... so would that mean that points 2 and 4 on PL101 are connected on this part of the circuit?
Mark

Dave Moll · 25th Jun 2020, 8:21 am

Pin 2 is connected to the wire that heads off the top of the shown section of the circuit, while pin 4 is connected to "ground" and to the screen round said wire.

The General · 25th Jun 2020, 8:57 am

Exactly as Dave Moll says, plus in your previous drawing pin 2 on PL101 heads off over the top via a shielded cable to a pin on plug PL600, while pin 4 connects to the shield (screen) of that cable & reappears at the other end of the cable & onto a pin on PL600.

The General · 25th Jun 2020, 8:59 am

oh, & pin 2 & pin 4 are not connected, but they do both connect to the core(2) & the shield(4) of the same shielded cable.

Emibell · 25th Jun 2020, 10:01 am

Thanks for the replies, that helps a lot.

24th Jun 2020, 10:22 pm	#1
Emibell Tetrode Join Date: Jan 2016 Location: Shepperton, Surrey, UK. Posts: 91	What is this symbol? I’m sure this is a dumb question and the answer is very simple... but can anyone tell me what the broken circles highlighted by yellow rings mean on this circuit diagram. Sorry they are small and a bit difficult to see but there are three of them inside the yellow circles. Attached Thumbnails

24th Jun 2020, 10:28 pm	#2
The General Hexode Join Date: Apr 2007 Location: Milton Keynes, Buckinghamshire, UK. Posts: 329	Re: What is this symbol? They represent connectors, & the broken circles represent the shield of the screened cables. Mark Last edited by The General; 24th Jun 2020 at 10:34 pm. Reason: Added info

25th Jun 2020, 8:21 am	#4
Dave Moll Dekatron Join Date: Feb 2005 Location: West Cumbria (CA13), UK Posts: 6,127	Re: What is this symbol? Pin 2 is connected to the wire that heads off the top of the shown section of the circuit, while pin 4 is connected to "ground" and to the screen round said wire. __________________ Mending is better than Ending (cf Brave New World by Aldous Huxley)

25th Jun 2020, 8:57 am	#5
The General Hexode Join Date: Apr 2007 Location: Milton Keynes, Buckinghamshire, UK. Posts: 329	Re: What is this symbol? Exactly as Dave Moll says, plus in your previous drawing pin 2 on PL101 heads off over the top via a shielded cable to a pin on plug PL600, while pin 4 connects to the shield (screen) of that cable & reappears at the other end of the cable & onto a pin on PL600.

25th Jun 2020, 8:59 am	#6
The General Hexode Join Date: Apr 2007 Location: Milton Keynes, Buckinghamshire, UK. Posts: 329	Re: What is this symbol? oh, & pin 2 & pin 4 are not connected, but they do both connect to the core(2) & the shield(4) of the same shielded cable.

25th Jun 2020, 10:01 am	#7
Emibell Tetrode Join Date: Jan 2016 Location: Shepperton, Surrey, UK. Posts: 91	Re: What is this symbol? Thanks for the replies, that helps a lot.