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Old 17th February 2013, 01:34 PM   #1341
NicMac is offline NicMac  Italy
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Quote:
Originally Posted by LuisMCP View Post
Hi Patrick,

Why use a Relay instead a simple switch?
The floating supplies need separate "switches" and relays are more convenient as you may control multiple with a single simple switch.
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Old 17th February 2013, 01:44 PM   #1342
EUVL is offline EUVL  Europe
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Well, one can in theory also use those multi-deck switches as used in the Cordell THD Analyser.
My implementation of the Cordell Distortion Analyser




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Old 17th February 2013, 06:30 PM   #1343
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Are normal small signal relay appropriate, as they have to switch DC and signal at the same time. Any Omron series reccomended ?
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Old 17th February 2013, 08:27 PM   #1344
NicMac is offline NicMac  Italy
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I think Patrick uses Omron G6S.
The relay only switch power (and not signal), but or course that may also affect the signal
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Old 17th February 2013, 11:02 PM   #1345
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The signal current does not go through the relay.
Check out the current loop from DAC iout to DAC Gnd.
The battery (and hence the relay) is not in that loop, or at least should not be.




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Old 18th February 2013, 12:43 PM   #1346
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Patrick
does 18VAC 1.6 A transformer proper choice for charging 4 x 14 x 1.4 NiMH batteries with one LM317
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Old 18th February 2013, 01:44 PM   #1347
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Why not make up a simple Spice file to check it for yourself ?


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Old 18th February 2013, 03:21 PM   #1348
LuisMCP is offline LuisMCP  Spain
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Quote:
Originally Posted by samoloko View Post
Patrick
does 18VAC 1.6 A transformer proper choice for charging 4 x 14 x 1.4 NiMH batteries with one LM317
I believe that each stack of 7 cells will "eat" 60 mA. This is 60 x 4 = 240 mA

18V x 0,25 A = 4,5VA and yours is 1,6A x 18V = 28,8 VA

seems OK
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Old 19th February 2013, 09:20 AM   #1349
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Hello Patrick,
I'm testing my SEN on ES9018 with Salas Shunt PSU.
Everything seems ok, But I'd like to have your suggestion about the shunt current. The total Idss is about 33mA and now I'm using a shunt current of about 70mA.
What do you think about?
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Old 19th February 2013, 09:33 AM   #1350
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There is no dynamic current in the loop, so in theory 35mA is enough.
I consider 50mA more than sufficient, and 70mA a bit over the top.

But no harm done in any case.


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